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1 Scope
This standard specifies the use of gas chromatography to determine the content of dimer (4-vinylcyclohexene) in butadiene for industrial use
This standard applies to the determination of butadiene dimer in industrial butadiene with a content of not less than 5mg/kg
2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through quotation in this standard
GB/T 3723-1983 General rules for the sampling safety of industrial chemical products (eqv ISO 3165:1976)
GB/T 8170-1987 Numerical Rounding Rules
GB/T 9722-1988 Chemical Reagent Gas Chromatography General Rules
GB/T 13290-1991 Industrial Propylene and Butadiene Liquid Sampling Method
SH/T 0221-1992 Liquefied Petroleum Gas Density or Cabinet-to-Density Determination Method (Pressure Densitometer Method)
3 Method summary
The liquid butadiene sample is injected into the chromatographic column.
4 Materials and reagents
4.
Nitrogen: Purity is greater than 99.
4.
4.
4.
4.
Chromosorb P AW or other carriers of the same type
4.
Polyethylene glycol 1500 (PEG1500), chromatographic stationary liquid
4.
4.
4.
4.
6 Sample injection cylinder
The material is stainless steel, the volume is 100mL, and the working pressure is 4MPa
.
Other sampling devices that can meet the requirements and are safe can also be used
.
4.
7 Liquid injection valve
Any liquid phase injection valve that can meet the following requirements can be used: Under the vapor pressure of butadiene not lower than the operating temperature, butadiene can be repeatedly injected in liquid state, and meet the requirements of chromatographic separation
.
The injection valve should be equipped with a loop with a volume of 1uL
.