Method for preparing ethyl sorbate through microwave esterification

The invention provides a method for preparing ethyl sorbate through microwave esterification. The preparation method provided by the invention can overcome the ubiquitous problems of long reaction time, low yield, dark yellow color, more byproducts, high energy consumption and the like during esterification in the prior art. Besides, in the presence of aluminum trichloride and copper isobutyrate, crotonaldehyde and ketene react to generate sorbic acid, and the method is simple to operate and high in crotonaldehyde conversion rate. The method disclosed by the invention has the advantages of simplicity and convenience in operation, high efficiency, good product quality and the like, has very high economic value and is suitable for industrial large-scale application. 本发明提供了一种微波酯化制备山梨酸乙酯的方法。本发明的制备方法能够克服已有技术普遍存在的酯化时反应时间长、收率低、颜色深黄、副产物多、能耗大等问题。此外，本发明通过在三氯化铝、异丁酸铜的存在下，使巴豆醛与乙烯酮反应生成山梨酸，所述方法操作简单、巴豆醛转化率高。本发明的方法具有操作简便、效率高、产品质量佳等优点，具有很高的经济价值，适合工业化大规模应用。