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1 Scope
1.
This standard is applicable to the determination of trace water in industrial butadiene and other carbon four olefins, and the determination range is (5~500) mg/kg
1.
2 Normative references
The clauses in the following documents have become clauses of this standard after being quoted in this standard
GB/T2366-1986 Determination of Moisture Content in Chemical Products Gas Chromatography
GB/T8170 Numerical rounding rules
GB/T13290 Industrial Propylene and Butadiene Liquid Sampling Method
3 Method summary
The sample to be tested is completely vaporized through a dedicated vaporization device.
H 2 O+I 2 +SO 2 +CH 3 OH+3RN→(RNH)SO 4 CH 3 +2(RNH)I
The consumed iodine is electrolytically supplemented by the anolyte containing iodide ions:
2I - → the I 2 + 2E
The amount of iodine required for the reaction is directly proportional to the amount of electricity passing through the electrolytic cell.
4 Reagents and materials
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11 Nitrogen: the purity (volume fraction) is not less than 99.
995%
.