Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2542—93
Industrial trichloroethylene
Published on September 25, 1993
Ministry of Chemical Industry of the People's Republic of China
Implemented on July 1, 1994
W Chemical Industry Standard of the People's Republic of China
Industrial trichloroethylene
Subject content and scope of application
Vinyl chloride
HG/T2542—93
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of industrial trichloroethylene. This standard applies to industrial trichloroethylene obtained by distillation after dehydrochlorination of tetrachloroethane. Molecular formula: C2HCls
Structural formula: H-CcCI
Relative molecular mass: 131.39 (according to the 1989 international relative atomic mass) 2. Reference standards
GB/T601 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB/T603 Preparation of preparations and products used in test methods of chemical reagents GB1250 Methods for expressing and determining limit values GB3143
Color determination of liquid chemical products (Hazen units GB/T4472 Density of chemical products General rules for determination of relative density (platinum-diamond color number) bzxz.net
GB/T6324.2 General method for determination of dry residue after evaporation of volatile organic liquids on a water bath GB/T6283 Determination of water content in chemical products Karl Fischer method (general method) GB/T6678
General rules for sampling of chemical products
GB/T6680 General rules for sampling of liquid chemical products Determination of boiling range of volatile organic liquids for industrial use GB/T7534
3 Technical requirements
3.1 Appearance: Transparent liquid without suspended matter and sediment. The quality of trichloroethylene should meet the requirements in the following table. 3.2
Chroma (Hazen unit platinum-diamond color number)
Density pre (g/cm2)
Distillation test (0℃101.325kPa)
Initial distillation point, ℃
Dry point, ℃
Temperature at which 95% (V/V) is distilled, ℃
Approved by the Ministry of Chemical Industry of the People's Republic of China on 1993-09-25>
Superior product
1.460~1.466
-Qualified product
1.457~1.4 72
1994-07-01 implementation
W. Evaporation residue, %
Acidity (in HCI)% or
Alkalinity (in NaOH), %
Water, %
Free chlorine
Acidity after accelerated oxidation test (in HC1), %4Test method
HG/T2542—93
Superior product
Qualified product
The reagents and water used in this standard, unless otherwise specified, are analytical reagents and distilled water or water of equivalent purity. The standard solutions, preparations and products used in this standard are prepared in accordance with the provisions of GB/T601 and GB/T603 unless otherwise specified.
4.1 Determination of chromaticity
Perform in accordance with the provisions of GB3143.
4.2 Determination of density
Perform the density test in accordance with the provisions of 2.3.3 density meter method in GB/T4472. Convert the density A measured at 16-40℃ into the density p20 at 20℃, and calculate P2o according to formula (1). P2o=A+0. 001 7 (t-20)
Wherein: P2o
density of a laboratory sample at 20℃, g/cm3; density of a laboratory sample measured at 1640℃, g/cm3; temperature at which the density of the laboratory sample is measured, ℃; (1)
temperature correction coefficient of trichloroethylene density, g/cm3. 0.0017-
Take the arithmetic mean of the results of two parallel measurements as the measurement result, and the difference between the two parallel measurement results shall not exceed 0.0005g/cm3. 4.3 Distillation test
Perform the test in accordance with the provisions of GB/T7534. The rate of change of boiling point of trichloroethylene with pressure: 3.2X10-4℃/Pa. 4.4 Determination of evaporation residue
Take 100±1.0mL of laboratory sample. Other operating conditions shall be carried out in accordance with GB/T6324.2. The arithmetic mean of the results of two parallel determinations shall be taken as the determination result, and the difference between the results of two parallel determinations shall not be greater than 0.0005%. 4.5 Determination of acidity or alkalinity
4.5.1 Summary of method
Extract the acid or base in the laboratory sample with water and let it stand for stratification. Extract the water layer and titrate it with sodium hydroxide or hydrochloric acid standard titration solution to obtain the acidity or alkalinity.
4.5.2 Reagents and solutions
a. Standard sodium hydroxide titration solution: c (NaoH) = 0.01 mol/L; b.
Standard hydrochloric acid titration solution: c (HCI) = 0.01 mol/L; 2
c. Bromothymol blue indicator solution: 1 g/L; HG/T2542—93
d. Water: Use 0.01 mol/L sodium hydroxide or 0.01 mol/L hydrochloric acid standard titration solution to adjust the pH value to 6.67.0. 4.5.3 Instruments
General laboratory instruments.
4.5.4 Analysis steps
Use a measuring tube to measure 50+1.0mL of laboratory sample and 100+1.0mL of water in a separating funnel, shake vigorously for 3min (200 times), let stand for stratification, pipette 50mL of the water layer into a conical flask, add 5-6 drops of bromothymol blue indicator solution, if the solution is acidic, the solution is yellow. If the solution is alkaline, the solution is blue. If the solution is neutral, the solution is green. If the solution is acidic: titrate with 0.01mol/L sodium hydroxide standard titration solution under magnetic stirring until the color changes to blue, which is the end point.
If the solution is alkaline: titrate with 0.01mol/L hydrochloric acid standard titration solution under magnetic stirring until the color changes to yellow, which is the end point. If the solution is neutral: treat as if the solution is acidic. 4.5.5 Calculation of analysis results
The mass percentage X of acidity (in HCl) or alkalinity (in NaOH) is calculated according to formula (2): Vi.CE
XV..A.0.5
Wherein: V1 is the volume of sodium hydroxide or hydrochloric acid standard titration solution consumed by the sample, mL; the actual concentration of sodium hydroxide or hydrochloric acid standard titration solution, mol/L; V is the volume of the laboratory sample, mL; A is the density of the laboratory sample, g/cm; (2
E is the volume of the sample with 1.00 mL of sodium hydroxide standard titration solution [c (NaOH) - 1.000mol/L] equivalent to the mass of hydrochloric acid expressed in grams. Or the mass of sodium hydroxide expressed in grams equivalent to 1.00mL of hydrochloric acid standard titration solution [c(HCI)=1.000mol/L].
When the solution is neutral, report the result with acidity ≤0.001%. The arithmetic mean of the results of two parallel determinations is taken as the determination result. The difference between the two parallel determination results shall not exceed 0.0005%. 4.6 Determination of water content
Use a pipette to draw 10mL of laboratory sample. Other operating conditions shall be carried out in accordance with GB/T6283. Take the arithmetic mean of the results of two parallel determinations For the determination result, the difference between two parallel determination results shall not exceed 0.005%. 4.7 Determination of free chlorine
4.7.1 Summary of the method
Free chlorine reacts with potassium iodide in an acidic medium to generate free iodine, which turns blue when it comes into contact with starch. The presence of chlorine is determined based on whether blue is generated.
4.7.2 Reagents and solutions
a. Potassium iodide solution: 100g/L
b. Acetic acid solution: 1+1;
c. Starch solution: 5g/L.
4.7.3 Instruments
General laboratory instruments.
4.7 .4 Analysis steps
Use a measuring cylinder to measure 20mL of the laboratory sample into a colorimetric tube, add 50mL of water, and shake vigorously for 3min (about 200 times). After standing for 3
HG/T2542—93
layers, draw 20mL of the water layer into another colorimetric tube, and add 0.1mL of potassium iodide solution and 1mL of acetic acid solution in sequence with a graduated pipette. 0.1mL of starch solution. Shake evenly, place in a dark place for about 5min, and observe whether blue appears. If no blue appears, it is considered qualified.
4.8 Determination of acidity after accelerated aeration test
4.8.1 Method Summary
In the presence of a steel sheet, oxygen saturated with water is introduced into the sample. The sample is heated with a light bulb and refluxed for 48 hours. It is then extracted with water, the water layer is absorbed, and titrated with a standard sodium hydroxide solution to determine the acidity. 4.8.2 Apparatus
Standard ground-mouth conical flask: 500mL;
Standard ground-mouth straight tube condenser: 500mm long; Light bulb: 220V, 150W;
Stainless steel lampshade: Φ178×190×1mm; Stainless steel support plate: Φ195×6mm, center hole Φ83mm; e.
Steel sheet GB700 Aa thin plate is cut into the following sizes: A sheet: 20×6×2mm (1 piece)
B sheet: 50X13×2mm (1 piece)
Polish with fine sandpaper, then clean with trichloroethylene before use; g.
Oxygen and oxygen cylinder;
Accelerated oxidation test device.
Figure Accelerated oxidation test device
1-gas outlet; 2-ground straight tube condenser; 3-ground triangular bottle; 4-steel sheet (B sheet); 5-steel sheet (A sheet); 6-bulb; 7-stainless steel lampshade; 8-vents (4); 9-stainless steel support plate; 10-oxygen inlet pipe with inner diameter of 63mm, 11-cock, 12-oxygen counting bottle, 13-water, 14-oxygen regulating cylinder, 15-water, 16-water washing bottle, 17-water; 18-pressure reducing valve; 19-oxygen W.bzsoso.coI4.8.3 Test method
HG/T2542—93
Measure 200mL of laboratory sample into a 500mL ground-mouth conical flask, put in steel sheet A, insert the oxygen tube into the condenser (the diameter of the blow-molded tube at the end of the tube is 3mm, 6mm from the bottom of the bottle), and tie steel sheet B to the bottom of the oxygen input tube with a polytetrafluoroethylene belt (as shown in the figure), then pass cooling water and oxygen respectively and heat with a bulb, adjust the oxygen flow rate (10-12 bubbles/min) and water flow rate (so that the sample condenses and refluxes at a height below half of the straight tube condenser), and stop the test after continuous heating and reflux for 48 hours. Cool to room temperature and determine the acidity according to item 4.5. 5 Inspection rules
5.1 Trichloroethylene shall be inspected by the quality supervision and inspection department of the manufacturer. The manufacturer shall ensure that all technical indicators of the products shipped meet the requirements of this product standard and attach a quality certificate in a certain format. The content of the quality certificate includes product name, product grade, product batch number, net weight, factory date and standard number. Trichloroethylene products used for metal vapor degreasing shall be inspected according to all items in the technical requirements. Trichloroethylene for other purposes shall not be tested for acidity after accelerated oxidation test. 5.2 When leaving the factory, any number of the same grade shall be considered as a batch. The sampling method and number of sampling units shall be carried out in accordance with the provisions of 6.4 and 6.6 of GB/T6678. The sampler shall comply with the provisions of Appendix A.2 of GB/T6680. The sampling volume of each batch shall not be less than 1 liter. After sufficient mixing, it shall be divided into two clean, dry brown bottles and sealed. Labels shall be attached and the product name, batch number, grade, sampling date and sampler shall be indicated. One bottle shall be sent to the inspection department for inspection, and the other bottle shall be kept for 3 months for future reference. 5.3 The judgment of the inspection results shall be based on the rounded value comparison method of GB1250. If one of the indicators in the inspection results does not meet the requirements of this standard, samples shall be taken from twice the amount of packaging for re-inspection. If only one indicator in the re-inspection results does not meet the requirements of this standard, the entire batch of products shall be unqualified.
5.4 The user has the right to inspect and accept the product quality according to this standard. During the storage period, if the supply and demand parties have any objections to the product quality, they shall promptly raise them and resolve them through negotiation or ask the arbitration unit to conduct arbitration analysis. 6 Marking, packaging, transportation and storage
6.1 Paint the packaging barrel firmly with paint: manufacturer name, product name, product grade, product batch number, production date, this standard number, product net weight.
6.2 Trichloroethylene should be packaged in 200-liter galvanized closed steel barrels, each barrel with a net weight of 200 or 250kg, the weight difference is allowed to be 0.5kg, and the barrel cover should be airtight.
6.3 This product should be prevented from violent impact during transportation and handling to avoid cracking of the barrel skin weld, and at the same time prevent rain and sun exposure. 6.4 This product should be stored in a well-ventilated warehouse or shed, either single or stacked. Additional remarks:
This standard was 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 jurisdiction of Beijing Chemical Industry Research Institute of the Ministry of Chemical Industry. This standard was drafted by Jinxi Chemical General Plant.
The main drafters of this standard are Wang Huilin, Gao Fenglin and Du Wenjuan. This standard adopts Japanese standard JISK1508-82.5
W.bzsoso.coI4 This product should be stored in a well-ventilated warehouse or canopy, either in a single or stacked state. Additional Notes:
This standard was 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 jurisdiction of the Beijing Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Jinxi Chemical General Plant.
The main drafters of this standard are Wang Huilin, Gao Fenglin and Du Wenjuan. This standard refers to the Japanese standard JISK1508-82. 5
W.bzsoso.coI4 This product should be stored in a well-ventilated warehouse or canopy, either in a single or stacked state. Additional Notes:
This standard was 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 jurisdiction of the Beijing Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Jinxi Chemical General Plant.
The main drafters of this standard are Wang Huilin, Gao Fenglin and Du Wenjuan. This standard refers to the Japanese standard JISK1508-82. 5
W.bzsoso.coI
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