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第 45 卷第 2 期Vol. 45 No. 2
2015 年 4 月Apr 2015

所屬欄目:農藥及中間體

2,5-二甲基苯乙酸合成工藝改進(jìn)研究
鄒建平1,2,3,尹篤林1,趙東江2,3,5,陳蒙慈4,楊 彬2,3,5,陳 明2,3* (1. 湖南師范大學(xué) 化學(xué)化工學(xué)院,湖南 長(cháng)沙 410081;2. 湖南化工研究院 國家農藥創(chuàng )制工程技術(shù)研究中心,湖南 長(cháng)沙 410014;3. 農用化學(xué)品湖南省重點(diǎn)實(shí)驗室,湖南 長(cháng)沙 410014;4. 湖南海利化工股份有限公司,湖南 長(cháng)沙 410007;5. 湖南大學(xué) 化學(xué)化工學(xué)院,湖南 長(cháng)沙 410082)
摘 要:以對二甲苯為原料,經(jīng)氯甲基化、氰化和酸性水解制備2,5-二甲基苯乙酸。通過(guò)優(yōu)化氯甲基化反應的條件,大幅度降低了二取代產(chǎn)物的量;通過(guò)氰基酸性水解避免了堿性水解法產(chǎn)品難過(guò)濾、含鹽廢水大的問(wèn)題?偸章77.9%,含量99%以上。
關(guān)鍵詞:2,5-二甲基苯乙酸;氯甲基化;氰化;酸性水解
中圖分類(lèi)號:S482.5+2  文獻標識碼:A  文章編號:1009-9212(2015)02-0020-03
Improvement on Synthetic Method of 2,5-Dimethylphenylacetic Acid
ZOU Jian-ping1,2,3, YIN Du-lin1, ZHAO Dong-jiang2,3,5, CHEN Meng-ci4, YANG Bing2,3,5, CHEN Ming2,3* (1. School of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China; 2.Hunan Research Institute of Chemical Industry, National Engineering Research Centre for Agrochemicals, Changsha 410014, China; 3. Hunan Province Key Laboratory for Agrochemicals, Changsha 410014, China; 4. Hunan Haili Chemical Industry Co., Ltd., Changsha 410007, China; 5. School of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China)
Abstract:2,5-Dimethylphenylacetic acid was obtianed through a series of reactions including chloromethylation, cyanidation, and acid hydrolysis using para-xylene as the starting material. The content of two substituted impurities was greatly reduced through optimizing the reaction conditions for chloromethylation. The work-up process was greatly improved by the changing the hydrolysis condition from basic to acidic. In this process, the filtration of a large quantity of salinity wastewater was avoided. A total yield of 77.9% with purity over 99% was obtained.
Key words:2,5-dimethylphenylacetic acid; chloromethylation; cyanidation; acid hydrolysis
作者簡(jiǎn)介:鄒建平(1990-),男,湖南郴州人,碩士研究生,主要從事農藥合成工藝研究(E-mail:zou2998@163.com)。
聯(lián) 系 人:陳 明,研究員,主要從事農藥及其中間體合成工藝研究(E-mail:chegming1@163.com)。
收稿日期:2015-01-19
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