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针对聚乙烯醇(PVA)生产中的副产物—醋酸甲酯中乙醛的去除方法进行了较为系统的研究。通过分析试验结果,认为蒸馏分离法只能去除40%~70%的乙醛;萃取分离法虽能去除部分乙醛,但萃取后的废水不易处理;加入亚硫酸氢钠除醛效果较好,能够满足醋酸甲酯羰基化合成醋酐的要求。
A systematic study was conducted on the removal of acetaldehyde from the byproduct methyl acetate in polyvinyl alcohol (PVA) production. By analyzing the experimental results, it is considered that only 40% ~ 70% of acetaldehyde can be removed by distillation separation method; although some acetaldehyde can be removed by extraction and separation method, the wastewater after extraction is not easy to be treated; addition of sodium bisulfite is better than aldehyde removal, To meet the carbonylation of methyl acetate acetic anhydride synthesis requirements.