This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, storage and transportation, and safety measures for industrial styrene. This standard applies to industrial styrene produced from ethylbenzene through dehydrogenation, distillation and other processes. GB 3915-1998 Styrene for industrial use GB3915-1998 Standard download and decompression password: www.bzxz.net

GB3915-1998 | | tt |
Compared with ASTMD2827, the main differences between this standard and ASTMD2827 are: 1. According to the actual production of styrene in my country, the products are still divided into three grades according to the original standard, while ASTMD2827 is not divided into grades. The index of superior products is the level of aldehyde content. Except for being better than ASTMD2827, the others are equal to it. 2 The test methods of this standard all adopt national standard test methods that are equivalent or equivalent to those specified in ASTM D2827. Compared with the original standard, the main revisions of this standard are: 1. The purity index of superior products is changed from 99.6% to 99.7%; the purity index of first-class products is changed from 99.4% to 99.5%, and the purity index of qualified products is changed from 99.0% to 99.3%. The total aldehyde index of qualified products was changed from 0.04% to 0.02%, the peroxide index was changed from 200mg/kg to 100mg/kg, and the polymerization inhibitor index was changed from 10~30mg/kg to 10~15mg/kg. In addition, the sulfur content indicator item was cancelled. 2. In terms of test methods, in addition to abolishing GB/T12688.7-1990 "Colorimetric method for determination of polymerization inhibitor (p-tert-butylcatechol) content in industrial styrene", GB/T12688.8-- In addition to the 1998 "Spectrophotometric Method for Determination of the Content of Polymerization Inhibitor (p-tert-butylcatechol) in Industrial Styrene", in this revision, ASTM D5135-1995 "Standard for Analysis of Styrene by Capillary Gas Chromatography" is also adopted. Test Method", which revised GB/T12688.1-1990 "Gas Chromatography Method for Determination of Purity of Industrial Styrene". All other items were reviewed and confirmed by the original standards.
3 Supplementary provisions for the determination of styrene indicators and data rounding methods, as well as relevant content of safety measures. This standard will replace GB3915-1990 from the date of implementation. This standard was proposed by China Petrochemical Corporation. This standard is under the jurisdiction of the Petrochemical Sub-Technical Committee of the National Chemical Standardization Technical Committee. This standard is drafted by Gaoqiao Chemical Plant of Shanghai Gaoqiao Petrochemical Company. The main drafters of this standard: Wang Junfu, Chen Jianhua, Cai Chunhui, Dong Jianfang, Chen Haidong, Song Lanying. This standard was first published on November 7, 1983. First revised on December 30, 1990. 165
1 Scope
National Standard of the People's Republic of China
Industrial
Styrene for industrial use
Styrene for industrial use|| tt||GB 3915 - 1998
Replaces GB39151990
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, storage and transportation, and safety measures for industrial styrene. This standard applies to industrial styrene produced from ethylbenzene through dehydrogenation, distillation and other processes. Molecular formula: CH
Relative molecular mass: 104.15 (according to the 1995 international relative atomic mass) 2 cited standards
Which clause is marked? At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T605-1988 General method for colorimetric determination of chemical reagents (eqvISO6353-1: 1982GM36) GB/T 1250--1989
Expression method and judgment method of limit values ??GB/T 3723-1983
Sampling of industrial chemical products for safe toilet use (iatISO3165:1976) GB/T 6678—1986
General rules for sampling of chemical products
GB/T6680—1986 General rules for sampling of liquid chemical products Determination of purity of styrene for industrial use Capillary gas chromatography method GB/T 12688.11998
GB/T12688.2-1990 Determination of purity of styrene for industrial use Crystallization point method GB/T 12688.3-1990
Determination of polymer content in styrene for industrial use Determination of photometric method GB/T 12688.4--1990
, titration method for determination of peroxide content in styrene for industrial use GB/T 12688.5-1990 titration method for determination of total aldehyde content in styrene for industrial use GB/ T12688.8-1998 Determination of polymerization inhibitor (p-tert-butylcatechol) content in styrene for industrial use Spectrophotometric method GB13690--1992 Classification and labeling of commonly used hazardous chemicals 3 Technical requirements and test methods ||tt| |The technical requirements and test methods of industrial styrene should comply with the provisions of Table 1. Table 1 Technical requirements and test methods
Serial number
2
3
Purity, % (m/m)
Polymer content, mg/kg | |tt | |tt||Qualified product
Clear and transparent, no mechanical impurities and free water 99.7
10
99.5
99.3
50bZxz.net
Test method
Visual inspection\
GB/T 12688. 1
GB/T 12688. 2
GB/T 12688.3
1999-02-01 Implementation
Serial number
6
Project
Peroxide (calculated as hydrogen peroxide), mg/kg total aldehyde (calculated as benzaldehyde), % (m /m): Chroma (platinum-diamond color number), No.
1 Polymerization inhibitor (TBC), mg/kg
GB 3915—1998
Table 1 (End)
Indicator
Superior product
0.01
10
First-class product
100
0.02
15
10～152
Qualified product
0.02
30
1) Place the sample in a 100mL colorimetric tube, the liquid layer should be high It is 50~~60mm, visually inspected under sunlight or fluorescent lamp transmission. 2) In case of special circumstances, it can be implemented according to the agreement between the supply and demand parties. 4 Inspection rules
Test methods
GB/T 12688. 4
GB/T 12688. 5
GB/T 605
GB/T 12688.8
4.1 Styrene should be inspected by the quality inspection department of the manufacturer. The manufacturer should ensure that all styrene shipped from the factory meets the requirements of this standard. Each batch of styrene shipped from the factory should be accompanied by a quality certificate. The quality certificate should indicate: name of the manufacturer, detailed address, product name, product grade, batch number, production date, net weight, polymerization inhibitor name, and the code of this standard. 4.2 The user has the right to conduct quality consistency inspection on the received styrene in accordance with the provisions of this standard to check whether its indicators meet the requirements of this standard.
4.3 The sampling method shall be carried out according to the corresponding content in "Liquids with flow behavior at normal temperature" in GB/T6680-1986. The number and volume of samples shall be determined in accordance with Article 6.6 of GB/T6678-1986. Samplers should also be familiar with and comply with the safety requirements for sampling in GB/T3723. 4.4 The inspection results are judged using the rounding value comparison method specified in GB/T1250. 4.5 Among the test methods for purity items, GB/T12688.2 is the arbitration method. 4.6 If the inspection results do not meet the corresponding grade requirements of this standard, double sampling and re-inspection are required. If even one indicator in the re-inspection results does not meet the corresponding grade requirements of this standard, the entire batch of products should be downgraded or disqualified. 4.7 If a dispute arises about product quality within 25 days from the date of shipment, the user can raise it with the manufacturer and negotiate a settlement, or ask an arbitration institution for arbitration.
5 Packaging, marking, storage and transportation
5.1 Styrene should be packed into dry and clean special tankers or galvanized steel drums, and an appropriate amount of polymerization inhibitor (p-tert-butyl phthalate) should be added phenol). The net weight of each barrel of styrene is 160kg. The mouth of the barrel should be sealed to prevent styrene from seeping out and moisture from infiltrating. 5.2. Obvious and firm signs should be painted on packaging containers. The contents include: production company name, product name, trademark, production date, batch number, net weight, this standard code, etc., and are clearly marked with "flammable" and "dangerous goods" signs in accordance with the requirements of GB13690. Tank trucks and storage containers must also be clearly marked.
5.3 This product should be stored below 25℃ or in a refrigerated warehouse to prevent polymerization and deterioration. During transportation, relevant regulations of the transportation department should be followed, and rain and sun exposure should be prevented. 6 Safety Measures
6.1 Styrene monomer is flammable and will undergo exothermic polymerization when in contact with peroxide, inorganic acid and aluminum trichloride. Flash point, ℃
30
Freezing point, ℃
Boiling point, ℃
Autoignition temperature in air, ℃
Combustion concentration in air, %(V /V)
-30.6
145.2
490
1.1～6.1
167
GB3915-1998
6.2 When the concentration of vinyl vapor exceeds the maximum concentration, it will depress the nervous system, irritate the mucous membranes, and cause headaches, insomnia, etc. Long-term effects will damage the liver, nervous system and hematopoietic organs. The maximum allowable concentration of styrene vapor in the air in the work area is 5 mg/m, and the maximum allowable concentration in domestic water is 0.1 mg/L. In the case of acute poisoning, fresh air and milk should be provided before seeking medical treatment; artificial respiration should be performed when breathing stops. Styrene stuck to the skin can be removed by washing with soap and warm water. 6.3 The styrene operating area should be equipped with ventilation equipment. Special clothes, shoes, gloves and protective glasses should be worn when sampling or operating. When operating in areas with high concentrations of benzene vapor, appropriate gas masks or oxygen respirators should be worn. 6.4 The poured styrene should be covered with sand and then collected with tools made of non-sparking materials. When styrene burns, appropriate fire extinguishing tools such as foam fire extinguishers, dry powder fire extinguishers, carbon dioxide ash lighters, sand, spray water, water vapor, inert gas and asbestos quilts can be used.
6.5 When transporting styrene , all equipment and pipes must be grounded to avoid static electricity. 168
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