Ethylene oxide for industrial use
1 Scope
This standard specifies the requirements, test methods, inspection rules, as well as packaging, marking, transport, storage and safety of ethylene oxide for industrial use.
This standard is applicable to ethylene oxide produced by the direct oxidation of ethylene. This product is mainly used as a synthetic additive, an intermediate for pharmaceuticals, chemical fibers, dyes, etc.
Molecular formula: C2H4O
Structural formula:
Relative molecular mass: 44.05 (as per the international relative atomic mass in 2001)
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB 190 Packing symbol of dangerous goods
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods (GB/T 603-2002; ISO 6353-1:1982, NEQ)
GB/T 1250 Rules for expression and judgment of limiting values
GB/T 3143 Color determination method of liquid chemicals (Hazen unit - Platinum-cobalt scale)
GB/T 3723 Sampling of chemical products for industrial use - Safety in sampling (GB/T 3723-1999; idt ISO 3165:1976)
GB/T 6283 Chemical products - Determination of water Karl·fischer method (general method) (GB/T 6283-1986; eqv ISO 760:1978)
GB/T 6680 General rules for sampling liquid chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-1992; eqv ISO 3696: 1987)
GB/T 9722 Chemical reagent - General rules for the gas chromatography
Decree of the State Council of the People's Republic of China (2003) No. 373 Regulations on safety supervision of special equipment
ZHIJIJIANJUGUOFA (1999) No. 154 Supervision regulation on safety technology for pressure vessel
ZHIJIANJU (2003) No. 46 Safety supervision regulations for gas cylinders
LAOBUFA (1994) No. 262 Safety supervision regulation for road tankers transporting liquefied gases
3 Requirements
3.1 Appearance: colorless and transparent, free of mechanical impurities.
3.2 Ethylene oxide for industrial use shall meet the technical requirements specified in Table 1.
Table 1 Technical requirements
Item Index
Superior Grade product First Grade product
Mass fraction of ethylene oxide/% ≥ 99.95 99.90
Mass fraction of total aldehyde (counted by acetaldehyde)/% ≤ 0.003 0.01
Mass fraction of water/% ≤ 0.01 0.05
Mass fraction of acid (counted by acetic acid)/% ≤ 0.002 0.010
Mass fraction of carbon dioxide/% ≤ 0.001 0.005
Chromaticity/Hazen unit (Platinum-cobalt scale) ≤ 5 10
4 Test methods
4.1 Warning
Attention is drawn to the necessity for taking precautions to safeguard the health and safety of the personnel conducting the test against the potential hazard which may arise from the test procedures specified in the test method. The operator shall take proper safety and health measures.
4.2 General requirements
Unless otherwise stated, only recognized analytically pure reagents and Grade III water as specified in GB/T 6682 shall be used in the analysis.
Unless otherwise specified, the reference titration solutions, preparations and products used in the analysis shall be prepared in accordance with the requirements of GB/T 601 and GB/T 603.
4.3 Appearance
Add liquid laboratory samples to the 50 mL colorimetric tube with stopper and visually inspect axially under daylight lamp or sunlight.
4.4 Determination of ethylene oxide content
4.4.1 Method summary
The mass fraction of ethylene oxide is calculated by subtracting the total mass fraction of various impurities in ethylene oxide from 100.00.
4.4.2 Calculation of results
The mass fraction, ω1, of ethylene oxide content, expressed as %, shall be calculated using Formula (1):
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Inspection rules
6 Packaging, marking, transport and storage
7 Safety
Annex A (Informative) Comparison between this standard and the ΓOCT standard in terms of clause/subclause numbers
