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METHOD OF PURIFYING HYDROGEN CHLORIDE GAS GENERATED AT TIME WHEN MANUFACTURING CHLOROACETIC ACID BY CONTACT-CHLORINATING ACETIC ACID BY CHLORINE GAS
METHOD OF PURIFYING HYDROGEN CHLORIDE GAS GENERATED AT TIME WHEN MANUFACTURING CHLOROACETIC ACID BY CONTACT-CHLORINATING ACETIC ACID BY CHLORINE GAS
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机译:氯气接触氯乙酸制造氯乙酸时净化产生的氯化氢气体的方法
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pHydrogen chloride gas obtained as a by-product in the production of chloroacetic acid by subjecting acetic acid to a catalytic chlorination reaction with chlorine gas in the presence of acetic anhydride and/or acetyl chloride is purified. The prepurified by-product still contains 0.1-3 vol % acetyl chloride and up to 0.1 vol % chloroacetyl chloride. For purification, the hydrogen chloride gas is passed through two zones series-connected together and scrubbed in countercurrent fashion. More particularly, it is scrubbed in the first zone with concentrated hydrochloric acid and in the second zone with concentrated sulfuric acid./p[US4678482A]
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