一步法合成4-溴丁酸乙酯

本文通过一步法制备了4-溴丁酸乙酯,采用傅里叶变换红外光谱仪(FTIR)对其物质结构进行表征,并研究溴酯比、加入乙醇的量、反应温度、反应时间对制备4-溴丁酸乙酯的影响。研究结果表明随着溴酯比、加入乙醇的量的增加,制备的4-溴丁酸乙酯纯度和收率先增加后减少;反应温度对4-溴丁酸乙酯纯度影响较小,但是对其收率影响明显;反应时间跟反应温度相互对应。该方法操作简单,在降低成本的同时提高了产品的纯度和收率,符合工业化生产的要求。In this paper, Ethyl 4-bromobutyrate was prepared by a one-step method. The structure of the substance was characterized by Fourier Transform Infrared Spectroscopy (FTIR). The author studied the effects of bromoester ratio, the amount of ethanol added, reaction temperature, and reaction time on the preparation Ethyl 4-bromobutyrate. The research results show that with the increase of the bromoester ratio and the amount of ethanol added, the purity and yield of Ethyl 4-bromobutyrate first increase and then decrease;the reaction temperature has little effect on the purity of Ethyl 4-bromobutyrate, but the yield has an obvious influence;the reaction time is determined by the reaction temperature. The method is simple to operate, improves the purity and yield of the product while reducing the cost, and meets the requirements of industrialized production.

N-甲基甲酰胺除水技术研究

本文通过精馏法和分子筛除水技术对N-甲基甲酰胺进行除水实验,研究了精馏法和分子筛除水技术对N-甲基甲酰胺除水效果的影响。研究结果表明,分子筛除水技术对N-甲基甲酰胺的除水效果明显优于精馏法。并且在采用3A329型分子筛,质量比为2.3,静置时间60 min时,除水效果可以使得N-甲基甲酰胺的水分含量 ≤ 200 ppm,同时提供了一次性除水和串联除水两种除水方式,可适用于对N-甲基甲酰胺不同的水分含量要求的各个行业。采用分子筛除水技术不仅能够使得N-甲基甲酰胺满足医药、锂电等行业要求,而且绿色无污染、成本低,因此此项除水技术具有广阔的应用前景。