Method for recovering byproduct chloromethane in maltol production

The invention relates to a method for recovering byproduct chloromethane in maltol production. After the chlorination reaction in maltol production is finished, chlorination liquid is subjected to hydrolysis reaction to generate methyl maltol and ethyl maltol, and chloromethane gas containing water, hydrogen chloride, methanol and other organic impurities is generated as a byproduct. According tothe method, the byproduct chloromethane is subjected to alkali washing, water washing and alkali washing again, after compression, rectification and cooling are carried out to obtain liquid chloromethane, thus reducing the impurity content in chloromethane, and reaching the purposes of impurity removing and purifying, meanwhile, chloromethane is also a maltol production raw material, and recyclingis achieved. 本发明涉及一种麦芽酚生产中副产物氯甲烷的回收方法，麦芽酚生产中氯化反应结束后，氯化液水解反应反应生成甲、乙基麦芽酚，副产含有水、氯化氢以及甲醇等其他有机物杂质氯甲烷气体，本发明是将副产物氯甲烷，进行碱洗、水洗、再碱洗，经过压缩，然后经过精馏及冷却，得到液态的氯甲烷，从而达到降低氯甲烷中的杂质含量，达到除杂纯化的目的，同时氯甲烷也是麦芽酚生产原料，达到循环利用。