Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2553—93
Published on September 25, 1993
4-Dinitrochlorobenzene
Implemented on July 1, 1994
Ministry of Chemical Industry of the People's Republic of China
WChemical Industry Standard of the People's Republic of China
2,4-Dinitrochlorobenzene
1 Subject Content and Scope of Application
HG/T2553—93
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation, storage, and safety requirements of 2,4-dinitrochlorobenzene.
This standard applies to 2,4-dinitrochlorobenzene obtained by nitration of chlorobenzene or o-nitrochlorobenzene. 2,4-Dinitrochlorobenzene is mainly used in the dye industry.
Molecular formula: C.H3N20,C1
Structural formula:
Relative molecular mass: 202.55 (according to the international relative atomic mass in 1989) Reference standards
GB190 Dangerous goods packaging mark
GB9722 General rules for gas chromatography of chemical reagents GB/T23851) General method for determination of crystallization point of dye intermediates GB/T13753 General method for determination of moisture content of dye intermediates Karl Fischer method and modified Karl Fischer method 3 Technical requirements
2,4-Dinitrochlorobenzene shall comply with the requirements of Table 1. Table 1
(1) Appearance
(2) Crystallization point, ℃
(3) Purity, 5
(4) Low boiling matter, 5
(5) Dinitrochlorobenzene isomers, 5
(6) High boiling matter, 5
(7) Moisture content, %
Superior quality
Editor's note: 1) The original version is "GB/T2384", this version is changed to GB/T2385" Chemical Industry of the People's Republic of China Approved by the Ministry of Industry on September 25, 1993, light yellow to light brown crystals, qualified products, implemented on July 1, 1994, W.bzsoso: com4 Test method 4.1 Appearance Visual method is used for determination. 4.2 Determination of crystallization point HG/T2553-93 According to GB/T2385 Method for determination. The sample is about 50g, melted at 65℃, and dried with 10g 4A (or 5A) molecular sieve.
4.3 Determination of 2,4-dinitrochlorobenzene purity and low-boiling substances, dinitrochlorobenzene isomers, high-boiling substances and other organic impurities 4.3.1 Instrument
Gas chromatograph: sensitivity and stability meet the requirements of GB9722; chromatographic column: stainless steel column with an inner diameter of 3mm and a length of 2m; detector: hydrogen flame ionization Detector; Recorder: Chromatographic data processor or recorder with full scale range of 5mV and response time of 1s; Syringe: 1uL micro syringe.
4.3.2 Preparation of chromatographic column
4.3.2.1 Filler
Stationary liquid: polyethylene glycol dinitrophthalate (FFAP) and phosphoric acid are mixed in a mass ratio of (5+1); Carrier: white diatomaceous earth (Chromosorb WHP), particle size 0.150~ 0.180mm (100~80 mesh); coating degree: fixative mixture/carrier = 8/100. 4.3.2.2 Fixative coatingwwW.bzxz.Net
Weigh 0.80g of fixative mixture in a 25mL beaker, add 25mL of chloroform and 15mL of methanol to completely dissolve it, slowly pour 10.0g of dry carrier into the beaker to completely soak the carrier, soak it for 15 minutes, gently tap and rotate the beaker under an infrared lamp to make the coating even, and wait for After the solvent evaporates, move to a 100℃ oven and dry for about 30 minutes. 4.3.2.3 Filling method
Wrap the detector end of the chromatographic column with gauze, connect it to a vacuum pump, and connect a funnel to the other end. Slowly pour in the freshly dried stationary phase under vacuum, and gently tap the chromatographic column to ensure that the filling is even and tight. Plug the filled chromatographic column with glass wool and prepare for aging. 4.3.2.4 Chromatographic column aging
Put the filled chromatographic column into the chromatographic column box, Aging was performed at a nitrogen flow rate of 5 to 10 mL/min and 220°C for 6 to 8 hours. During aging, the chromatographic column should be disconnected from the detector.
4.3.3 Chromatographic operating conditions
Select appropriate chromatographic operating conditions according to different instruments and the requirements of this standard. Taking SQ203 chromatograph as an example, the operating conditions are as follows: Column box temperature: 185°C;
Detection temperature: 250°C;
Vaporization temperature: 250°C;
Carrier gas (nitrogen) flow rate: 20mL/min; combustion gas (hydrogen) flow rate: 30mL/min; supporting gas (air) flow rate: 400mL/min; amplifier sensitivity: high resistance 108;
injection volume: luL;
sample concentration: 0.05g/mL;
recording paper speed: 300mm/h;
quantitative method: area normalization method;
resolution: above 1.8.
W.bzsoso.cOIHG/T2553—93
4.3.4 Preparation of calibration mixed solution and determination of correction factor 4.3.4.1 Preparation of calibration mixed solution
4.3.4.1.1 Reagents
Chloroform (GB/T682);
m-dinitrobenzene;
2,4-dinitrochlorobenzene: no impurities were detected under the test conditions; 2,6-dinitrochlorobenzene: no impurities were detected under the test conditions. 4.3.4.1.2 Preparation of single calibration solution
Weigh various reagents (accurate to 0.0002g, 2,4-dinitrochlorobenzene accurate to 0.001g) according to the requirements of Table 2, and dissolve and dilute with chloroform. The single calibration solution can be used for two months. Table 2
Solution name
Mass, g
Volume after dilution, mL
4.3.4.1.3 Preparation of calibration mixed solution
m-dinitrobenzene
2,4-dinitrochlorobenzene
2,6-dinitrochlorobenzene
According to the requirements of Table 3, use a pipette to pipette the above single calibration solutions into a clean and dry 10mL volumetric flask, and dilute to the scale with chloroform. The calibration mixed solution can be used for one month. Table 3
Amount of single calibration solution added, mL
Name of single calibration solution
Volume after dilution
4.3.4.2 Determination of correction factor
Calibration mixed solution number
Start the chromatograph, and after the operating conditions of the instrument are stable, pipette 1uL of calibration mixed solution for injection, and after the peak is completed, accurately measure the peak area of each component.
The correction factor of each component is calculated according to formula (1):
Wherein: f.—Correction factor of component i, mg/mmm
The mass of component i, mg,
The peak area of component i, mm2.
4.3.5 Determination steps
Weigh 0.5g of 2,4-dinitrochlorobenzene sample into a 10mL volumetric flask, dissolve it with chloroform and dilute to the scale, shake well. Start the instrument, wait for the instrument's operating conditions to stabilize, draw 1uL of sample solution for injection, and after the peak is complete, accurately measure the peak area of each component. The mass percentage of each component (X,) is calculated according to formula (2): T,·fA
Z(T,f,·A)
W. In the formula: X is the mass percentage of the component, %r is the signal attenuation multiple of component i;
f. is the correction factor of component i, mg/mm\, A is the peak area of component i, mm2.
HG/T2553-93
The arithmetic mean of the results of two parallel determinations is taken as the determination result. The components that elute after the solvent peak and before the 2,4-dinitrochlorobenzene peak are low-boiling substances, and the correction factor is calculated based on the correction factor of m-dinitrobenzene. The difference between the two parallel determination results is not more than 0.05%. The difference between the two parallel determination results of 2,4-dinitrochlorobenzene is not more than 0.2%. The components that elute after the 2,4-dinitrochlorobenzene peak and before the 2,6-dinitrochlorobenzene peak are dinitrochlorobenzene isomers, and the correction factor is calculated based on the correction factor of 2,6-dinitrochlorobenzene. The difference between the two parallel determination results is not more than 0.1%. The components that elute after the 2,6-dinitrochlorobenzene peak and before the relative retention time of 1.5 with 2,4-dinitrochlorobenzene are high-boiling substances, and the correction factor is calculated based on the correction factor of 2,6-dinitrochlorobenzene.
4.3.6 Chromatogram
See the figure below for an example of a chromatogram.
Signal attenuation
Chromatogram
1-Solvent chloroform, 2-Nitrochlorobenzene, 3-Dichloronitrobenzene, 4-Dinitrobenzene, 5-2,4-Dinitrochlorobenzene; 6-isomer; 7-2,6-Dinitrochlorobenzene 4.4 Determination of moisture content
The moisture content shall be determined in accordance with the provisions of GB/T13753. The sample volume shall be 2 g (accurate to 0.1 g), and the sample solvent shall be a (3+1) trichloromethane methanol mixed solvent. The difference between the results of two parallel determinations shall not exceed 0.05%, and the arithmetic mean shall be taken as the determination result. 4
W5 Inspection rules
5.1 Inspection classification
HG/T2553-93
Items (1) to (6) in Table 1 are factory inspection items; items (1) to (7) are type inspection items, and the inspection cycle is one month. 5.2 Factory inspection
2,4-Dinitrochlorobenzene shall be inspected by the quality supervision and inspection department of the manufacturer. The manufacturer shall ensure that all 2,4-dinitrochlorobenzene shipped out of the factory meets the requirements of this standard. Each batch of 2,4-dinitrochlorobenzene shipped out of the factory shall be accompanied by a quality certificate in a certain format, including: manufacturer name, product name, trademark, grade, net weight, batch number, production date and proof of compliance with this standard. 5.3 User acceptance
The user has the right to accept the received 2,4-dinitrochlorobenzene in accordance with the provisions of this standard. 5.4 Sampling method
The uniform product inspected each time is considered as a batch. Take samples from 10% of the total number of barrels of each batch of products. For small batches of products, the number of samples shall not be less than 3 barrels. Place the selected barrels in hot water to completely melt the product in the barrels and prevent moisture from entering the barrels. Stir the melted product evenly and use a clean and dry glass tube with a diameter of about 1.5 cm and a length of about 1 m to take samples from the upper, middle and lower parts of the barrel. The manufacturer can take samples after 1 to 2 barrels of material are discharged from the discharge port. When the sample solidifies, grind it and mix it evenly. Select no less than 500g of sample from it and pack it in two clean and dry ground-mouth bottles. Paste labels on the bottles, indicating: manufacturer name, product name, batch number, sampling date. One bottle is inspected by the inspection department and the bottle is kept for three months for reference. 5.5 Re-inspection
If one indicator of the inspection result does not meet the requirements of this standard, re-sample from twice the amount of packaging for inspection. Even if only one indicator of the re-inspection result does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 Arbitration
When the supply and demand parties have any objections to the product quality, they can negotiate to resolve the dispute. When arbitration is required, the arbitration institution shall be agreed upon by both parties. 6 Marking, packaging, transportation and storage
6.1 Marking
The packaging container of 2,4-dinitrochlorobenzene shall be marked with non-fading paint: manufacturer name, product name, trademark, net weight, production date, batch number, and marked with the "toxic" mark in accordance with the provisions of GB190. 6.2 Packaging
2,4-dinitrochlorobenzene is packaged in clean and dry iron barrels, with a net weight of 300kg per barrel. 6.3 Transportation
When transporting, it should be handled with care and protected from sunlight and rain. 6.4 Storage
When storing, it should be kept away from fire and placed in a cool and dry place. 7 Safety
When handling or transporting 2,4-dinitrochlorobenzene, protective equipment should be used to prevent direct contact with the skin or inhalation into the body. 5
WHG/T2553—93
Appendix A
Preparation of 2,6-Dinitrochlorobenzene Standard Sample
(Reference)
A1 Preparation of Potassium 4-Chloro-3,5-dinitrobenzenesulfonate Fix a 2000mL three-necked flask, install an electric stirrer, a 500mL dropping funnel, a straight condenser and a 200℃ long-rod thermometer (with appropriate connectors), and add the materials for reaction according to the steps in Table A1. Table A1
Reagents
10% fuming sulfuric acid 325mL
Chlorobenzene 51mL
Potassium nitrate 150g
20% fuming sulfuric acid 135mL
Adding method
Below 45℃
Add in three times
Below 50℃
Below 110℃
Below 115℃
After the reaction liquid is cooled, pour it into 1000mL of 0℃ water and filter it. The product 4-chloro-3,5-dinitrobenzenesulfonate potassium is obtained by hot filtration. A2
Preparation of potassium 4-amino-3,5-dinitrobenzenesulfonate Stirring or not
Reaction time
React for 0.5h after the addition
After the addition, keep warm at 110℃ for 1h
After the addition, keep warm at 115℃ for 0.5h
Wash twice with 250mL ice water, extract three times with 200mL hot benzene, add the product potassium 4-chloro-3,5-dinitrobenzenesulfonate and 20mL water into a 2000mL three-necked flask, add 150mL concentrated ammonia water several times under stirring, heat to the boiling of the reaction solution, and reflux for 0.5h. Cool the reaction solution, filter it with suction, and recrystallize it three times with water to obtain the product potassium 4-amino-3,5-dinitrobenzenesulfonate.
A3 Preparation of 2,6-dinitroaniline
Put the potassium 4-amino-3,5-dinitrobenzenesulfonate product and 560mL of 60% fuming sulfuric acid into a 1000mL single-necked flask, install a straight condenser, and reflux for 3h. Cool, wash the product on the condenser and the wall of the flask with 150mL of water, and filter. Recrystallize three times with water to obtain pure 2,6-dinitroaniline product. A4 Preparation of 2,6-dinitrochlorobenzene
Dissolve the 2,6-dinitroaniline product in 400mL of hot glacial acetic acid to obtain solution A. Dissolve 45g of cuprous chloride in 400mL of concentrated hydrochloric acid to obtain solution B. Put 15g of sodium nitrite into a 2000mL three-necked flask, install a stirrer and a reflux condenser, and react according to the steps in Table A2. Table A2
Input materials
160mL concentrated sulfuric acid
Solution A
Solution B
Addition method Temperature
Stirring or not
Below 40℃
Below 50℃
Reaction time
React for 0.5h after the addition
Until boiling stops
Dilute the reaction solution with twice the volume of water, cool, and filter. Wash with 500mL water, add 60mL glacial acetic acid and 70mL benzene respectively for recrystallization to obtain 2,6-dinitrochlorobenzene. Analyze according to the gas chromatography method specified in this standard. 6
Wbzsoso, cO waste.
Additional instructions:
HG/T2553—93
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical supervision of Shenyang Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Nanjing Chemical Plant of the Ministry of Chemical Industry, and Gedian Chemical Plant participated in the drafting. Liang Zhishun is the main drafter of this standard.
This standard adopts Japanese Industrial Standard JISK4103-82 (87) "Nitrochlorobenzenes". From the date of implementation of this standard, the former Ministry of Chemical Industry of the People's Republic of China Standard HG2-326-75 "2,4-Dinitrochlorobenzene" will be used as 7
W.bzsosocom5 Re-test
If one of the indicators in the test results does not meet the requirements of this standard, samples should be taken from twice the amount of packaging for re-testing. Even if only one indicator in the re-test results does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 Arbitration
When the supply and demand parties have objections to the product quality, they can negotiate to resolve the issue. When arbitration is required, the arbitration institution shall be agreed upon by both parties. 6 Marking, packaging, transportation and storage
6.1 Marking
The packaging container of 2,4-dinitrochlorobenzene should be marked with non-fading paint: manufacturer name, product name, trademark, net weight, production date, batch number, and marked with the "toxic" mark in accordance with the provisions of GB190. 6.2 Packaging
2,4-dinitrochlorobenzene is packaged in clean and dry iron barrels, with a net weight of 300kg per barrel. 6.3 Transportation
During transportation, it should be handled with care to prevent exposure to sunlight and rain. 6.4 Storage
Store away from fire and place in a cool and dry place. 7 Safety
When handling or transporting 2,4-dinitrochlorobenzene, protective equipment should be used to prevent direct contact with the skin or inhalation. 5
WHG/T2553—93
Appendix A
Preparation of 2,6-dinitrochlorobenzene standard sample
(reference)
A1 Preparation of potassium 4-chloro-3,5-dinitrobenzenesulfonate Fix a 2000mL three-necked flask, install an electric stirrer, a 500mL dropping funnel, a straight condenser and a 200℃ long-rod thermometer (with a suitable connector) and react according to the steps in Table A1. Table A1
Reagents
10% fuming sulfuric acid 325mL
Chlorobenzene 51mL
Potassium nitrate 150g
20% fuming sulfuric acid 135mL
Adding method
Below 45℃
Add in three times
Below 50℃
Below 110℃
Below 115℃
After the reaction liquid is cooled, pour it into 1000mL of 0℃ water and filter it. The product 4-chloro-3,5-dinitrobenzenesulfonate potassium is obtained by hot filtration. A2
Preparation of potassium 4-amino-3,5-dinitrobenzenesulfonate Stirring or not
Reaction time
React for 0.5h after the addition
After the addition, keep warm at 110℃ for 1h
After the addition, keep warm at 115℃ for 0.5h
Wash twice with 250mL ice water, extract three times with 200mL hot benzene, add the product potassium 4-chloro-3,5-dinitrobenzenesulfonate and 20mL water into a 2000mL three-necked flask, add 150mL concentrated ammonia water several times under stirring, heat to the boiling of the reaction solution, and reflux for 0.5h. Cool the reaction solution, filter it with suction, and recrystallize it three times with water to obtain the product potassium 4-amino-3,5-dinitrobenzenesulfonate.
A3 Preparation of 2,6-dinitroaniline
Put the potassium 4-amino-3,5-dinitrobenzenesulfonate product and 560mL of 60% fuming sulfuric acid into a 1000mL single-necked flask, install a straight condenser, and reflux for 3h. Cool, wash the product on the condenser and the wall of the flask with 150mL of water, and filter. Recrystallize three times with water to obtain pure 2,6-dinitroaniline product. A4 Preparation of 2,6-dinitrochlorobenzene
Dissolve the 2,6-dinitroaniline product in 400mL of hot glacial acetic acid to obtain solution A. Dissolve 45g of cuprous chloride in 400mL of concentrated hydrochloric acid to obtain solution B. Put 15g of sodium nitrite into a 2000mL three-necked flask, install a stirrer and a reflux condenser, and react according to the steps in Table A2. Table A2
Input materials
160mL concentrated sulfuric acid
Solution A
Solution B
Addition method Temperature
Stirring or not
Below 40℃
Below 50℃
Reaction time
React for 0.5h after the addition
Until boiling stops
Dilute the reaction solution with twice the volume of water, cool, and filter. Wash with 500mL water, add 60mL glacial acetic acid and 70mL benzene respectively for recrystallization to obtain 2,6-dinitrochlorobenzene. Analyze according to the gas chromatography method specified in this standard. 6
Wbzsoso, cO waste.
Additional instructions:
HG/T2553—93
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical supervision of Shenyang Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Nanjing Chemical Plant of the Ministry of Chemical Industry, and Gedian Chemical Plant participated in the drafting. Liang Zhishun is the main drafter of this standard.
This standard adopts Japanese Industrial Standard JISK4103-82 (87) "Nitrochlorobenzenes". From the date of implementation of this standard, the former Ministry of Chemical Industry of the People's Republic of China Standard HG2-326-75 "2,4-Dinitrochlorobenzene" will be used as 7
W.bzsosocom5 Re-test
If one of the indicators in the test results does not meet the requirements of this standard, samples should be taken from twice the amount of packaging for re-testing. Even if only one indicator in the re-test results does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 Arbitration
When the supply and demand parties have objections to the product quality, they can negotiate to resolve the issue. When arbitration is required, the arbitration institution shall be agreed upon by both parties. 6 Marking, packaging, transportation and storage
6.1 Marking
The packaging container of 2,4-dinitrochlorobenzene should be marked with non-fading paint: manufacturer name, product name, trademark, net weight, production date, batch number, and marked with the "toxic" mark in accordance with the provisions of GB190. 6.2 Packaging
2,4-dinitrochlorobenzene is packaged in clean and dry iron barrels, with a net weight of 300kg per barrel. 6.3 Transportation
During transportation, it should be handled with care to prevent exposure to sunlight and rain. 6.4 Storage
Store away from fire and place in a cool and dry place. 7 Safety
When handling or transporting 2,4-dinitrochlorobenzene, protective equipment should be used to prevent direct contact with the skin or inhalation. 5
WHG/T2553—93
Appendix A
Preparation of 2,6-dinitrochlorobenzene standard sample
(reference)
A1 Preparation of potassium 4-chloro-3,5-dinitrobenzenesulfonate Fix a 2000mL three-necked flask, install an electric stirrer, a 500mL dropping funnel, a straight condenser and a 200℃ long-rod thermometer (with a suitable connector) and react according to the steps in Table A1. Table A1
Reagents
10% fuming sulfuric acid 325mL
Chlorobenzene 51mL
Potassium nitrate 150g
20% fuming sulfuric acid 135mL
Adding method
Below 45℃
Add in three times
Below 50℃
Below 110℃
Below 115℃
After the reaction liquid is cooled, pour it into 1000mL of 0℃ water and filter it. The product 4-chloro-3,5-dinitrobenzenesulfonate potassium is obtained by hot filtration. A2
Preparation of potassium 4-amino-3,5-dinitrobenzenesulfonate Stirring or not
Reaction time
React for 0.5h after the addition
After the addition, keep warm at 110℃ for 1h
After the addition, keep warm at 115℃ for 0.5h
Wash twice with 250mL ice water, extract three times with 200mL hot benzene, add the product potassium 4-chloro-3,5-dinitrobenzenesulfonate and 20mL water into a 2000mL three-necked flask, add 150mL concentrated ammonia water several times under stirring, heat to the boiling of the reaction solution, and reflux for 0.5h. Cool the reaction solution, filter it with suction, and recrystallize it three times with water to obtain the product potassium 4-amino-3,5-dinitrobenzenesulfonate.
A3 Preparation of 2,6-dinitroaniline
Put the potassium 4-amino-3,5-dinitrobenzenesulfonate product and 560mL of 60% fuming sulfuric acid into a 1000mL single-necked flask, install a straight condenser, and reflux for 3h. Cool, wash the product on the condenser and the wall of the flask with 150mL of water, and filter. Recrystallize three times with water to obtain pure 2,6-dinitroaniline product. A4 Preparation of 2,6-dinitrochlorobenzene
Dissolve the 2,6-dinitroaniline product in 400mL of hot glacial acetic acid to obtain solution A. Dissolve 45g of cuprous chloride in 400mL of concentrated hydrochloric acid to obtain solution B. Put 15g of sodium nitrite into a 2000mL three-necked flask, install a stirrer and a reflux condenser, and react according to the steps in Table A2. Table A2
Input materials
160mL concentrated sulfuric acid
Solution A
Solution B
Addition method Temperature
Stirring or not
Below 40℃
Below 50℃
Reaction time
React for 0.5h after the addition
Until boiling stops
Dilute the reaction solution with twice the volume of water, cool, and filter. Wash with 500mL water, add 60mL glacial acetic acid and 70mL benzene respectively for recrystallization to obtain 2,6-dinitrochlorobenzene. Analyze according to the gas chromatography method specified in this standard. 6
Wbzsoso, cO waste.
Additional instructions:
HG/T2553—93
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical supervision of Shenyang Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Nanjing Chemical Plant of the Ministry of Chemical Industry, and Gedian Chemical Plant participated in the drafting. Liang Zhishun is the main drafter of this standard.
This standard adopts Japanese Industrial Standard JISK4103-82 (87) "Nitrochlorobenzenes". From the date of implementation of this standard, the former Ministry of Chemical Industry of the People's Republic of China Standard HG2-326-75 "2,4-Dinitrochlorobenzene" will be used as 7
W.bzsosocom5h
Until boiling stops
Dilute the reaction solution with twice the volume of water, cool, and filter. Wash with 500mL of water, add 60mL of glacial acetic acid and 70mL of benzene respectively for recrystallization to obtain 2,6-dinitrochlorobenzene. Analyze by gas chromatography as specified in this standard. 6
Wbzsoso, cO waste.
Additional instructions:
HG/T2553—93
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is technically managed by the Shenyang Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Nanjing Chemical Plant of the Ministry of Chemical Industry, and Gedian Chemical Plant participated in the drafting. The main drafter of this standard is Liang Zhishun.
This standard refers to the Japanese Industrial Standard JISK4103—82 (87) "Nitrochlorobenzenes". From the date of implementation of this standard, the former Ministry of Chemical Industry of the People's Republic of China standard HG2-326-75 "2,4-Dinitrochlorobenzene" will be used as5h
Until boiling stops
Dilute the reaction solution with twice the volume of water, cool, and filter. Wash with 500mL of water, add 60mL of glacial acetic acid and 70mL of benzene respectively for recrystallization to obtain 2,6-dinitrochlorobenzene. Analyze by gas chromatography as specified in this standard. 6
Wbzsoso, cO waste.
Additional instructions:
HG/T2553—93
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is technically managed by the Shenyang Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Nanjing Chemical Plant of the Ministry of Chemical Industry, and Gedian Chemical Plant participated in the drafting. The main drafter of this standard is Liang Zhishun.
This standard refers to the Japanese Industrial Standard JISK4103—82 (87) "Nitrochlorobenzenes". From the date of implementation of this standard, the former Ministry of Chemical Industry of the People's Republic of China standard HG2-326-75 "2,4-Dinitrochlorobenzene" will be used as
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.