Titration method for determination of peroxide content in industrial butadiene (1)

1 Scope

This standard specifies the method for the determination of peroxide content in butadiene for industrial use

This standard is applicable to the determination of peroxide content in industrial butadiene in terms of available oxygen mass (1/2O ₂ ), and the determination range is 1-10 mg/kg

2 Reference standards The provisions contained in the following standards constitute provisions of this standard through quotation in this standard

GB/T 601-1988 Preparation of standard solutions for chemical reagent titration analysis (volume analysis)

GB/T 6682-1992 Analytical laboratory water specifications and test methods

GB/T 8170-1987 Numerical Rounding Rules

GB/T 13290-1991 Industrial Propylene and Butadiene Liquid Sampling Method

3 Method summary

Take an appropriate amount of butadiene sample, place it in an Erlenmeyer flask, evaporate on a 60℃ water bath, then reflux the residue with acetic acid and sodium iodide reagent, and titrate the iodine released by the reaction with a standard sodium thiosulfate solution , Determine the end point of the titration visually

4 Reagents and solutions Unless otherwise specified, the reagents used in this standard are all analytical reagents, and the water used is in compliance with the specifications of Grade 3 water in GB/T6682

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Note: Wear gloves during operation to avoid frostbite

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Caution: Toxic and corrosive, flammable, harmful if inhaled, and fatal if swallowed

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5 Apparatus and equipment

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5 Electric heating plate: adjustable heating power;

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6 Water bath: the temperature of the water bath can be controlled at a constant temperature and maintained at 60℃±1℃;

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7 Balance; suitable for weighing butadiene sampling cylinders, with a sense of 0.
1g
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6 sampling

Take samples according to GB/T13290
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