碱预处理小麦秸秆制备乙酰丙酸甲酯的工艺

Preparation of methyl levulinate by pretreatment of wheat straw with alkali

小麦秸秆作为一种农业副产品,是制备生物质化学品的重要原料。乙酰丙酸甲酯(methyl levulinate,ML)是一种具有广泛应用前景的生物质化学品。本文以碱液预处理后的小麦秸秆为原料,硫酸铜为催化剂,研究了制备ML的工艺,考察了反应温度、反应时间、催化剂用量等对ML产率的影响。经过工艺优化,在反应温度183℃、反应时间3.3h、催化剂用量0.53g条件下,ML的收率达到23.0%(质量分数)。硫酸铜重复使用后仍具有良好的催化活性,在重复使用5次后ML收率达到18.7%(质量分数)。在相同的优化条件下,所开发的工艺比未处理小麦秸秆制备ML的收率提高了8.6%(质量分数)。

As a kind of agricultural by-product,wheat straw can be used as raw material for the preparation of biobased chemicals.Methyl levulinate(ML)is a kind of biobased chemical with wide applications.Using wheat straw pretreated with alkali as raw material and copper sulfate as catalyst,the process of preparing ML was studied.The effects of reaction temperature,reaction time and catalyst dosage on the yield of ML were investigated.Through optimization,the ML yield of 23.0%(mass fraction)was achieved under the reaction conditions of temperature 183℃,reaction time 3.3h and catalyst dosage 0.53g.Meanwhile,copper sulfate had good catalytic activity after repeated use,and the ML yield reached 18.7%(mass fraction)after five times of use.Under the same optimized conditions,the developed process improved the ML yield by 8.6%(mass fraction)compared with the ML yield from unpretreated wheat straw.