本文關(guān)鍵詞：酯交換法制備乙酸正丁酯催化精餾的過程研究　出處：《河北工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 酯交換 乙酸正丁酯 催化精餾 動力學(xué) 過程模擬

【摘要】：乙酸甲酯相比其它同系酯類,市場需求較小,而且它常作為工業(yè)副產(chǎn)大量出現(xiàn)。而乙酸正丁酯由于其優(yōu)異的溶解性能,逐步成為甲苯、二甲苯等有毒有害溶劑的替代品,因此市場前景廣闊。利用酯交換法將其轉(zhuǎn)化為乙酸正丁酯,為乙酸甲酯提供了一種效益更高的利用方法。本文篩選出Si-3為最優(yōu)催化劑后,在間歇攪拌釜式反應(yīng)器中進行了酯交換制備乙酸正丁酯的實驗研究�？疾炝宿D(zhuǎn)速、反應(yīng)溫度、催化劑用量、醇酯比等因素對反應(yīng)過程的影響。將實驗數(shù)據(jù)擬合后得到酯交換反應(yīng)的動力學(xué)方程:r=6291exp(-53643/RT)(αMe OAcαBu OH-αMEOHαBu OAc/K)其中:K=exp(4.15-1.667/T)在動力學(xué)研究的基礎(chǔ)上,使用化工模擬軟件對酯交換催化精餾過程進行了模擬計算�？疾炝巳碚摷墧�(shù)、進料位置、醇酯比和回流比對催化精餾過程的影響。在自行搭建的催化精餾實驗裝置中,以乙酸甲酯和正丁醇為原料,采用酯交換法催化精餾制備乙酸正丁酯。催化精餾塔高1.7m,內(nèi)裝負(fù)載催化劑的不銹鋼θ環(huán)填料層1.5m。實驗結(jié)果顯示:乙酸甲酯和正丁醇合適的進料位置為塔釜和距塔頂2/5處,正丁醇進料量為15m L/min,進料醇酯比1:1.2,回流比為1。此條件下正丁醇轉(zhuǎn)化率可達90.17%,塔釜正丁酯含量為86.24%,均高于相關(guān)文獻報道。同時塔頂中乙酸甲酯含量為22.11%,遠離共沸組成點,后續(xù)分離過程簡易。實驗規(guī)律與計算機模擬結(jié)果吻合較好,為進一步研究提供基礎(chǔ)數(shù)據(jù)。
[Abstract]:Compared with other homologous esters, methyl acetate has smaller market demand, and it often appears as a by-product of industrial by-products. Due to its excellent solubility, n-butyl acetate has gradually become a substitute for toxic and harmful solvents such as toluene and xylene, so the market has a broad prospect. It is converted into n-butyl acetate by transesterification, which provides a more efficient utilization method for methyl acetate. In this paper, the experimental study on the preparation of n-butyl acetate by transesterification in a batch reactor was carried out after screening Si-3 as the optimal catalyst. The influence of the speed, the reaction temperature, the amount of catalyst and the ratio of alcohol ester on the reaction process was investigated. The experimental data obtained after fitting the kinetic equation of the reaction of ester exchange: r=6291exp (-53643/RT) (alpha Me alpha Bu alpha MEOH alpha OH- OAc Bu OAc/K) where: K=exp (4.15-1.667/T) based on the kinetic study on the use of chemical simulation software of transesterification catalytic distillation process was simulated. The effects of the theoretical series of the whole tower, the position of feed, the ratio of alcohol and ester and the ratio of reflux to the catalytic distillation process were investigated. In the self constructed catalytic distillation unit, methyl acetate and n-butanol were used as raw materials, and n-butyl acetate was prepared by ester exchange catalytic distillation. Catalytic distillation tower 1.7m, built-in stainless steel ring packing layer 1.5m theta catalyst. The experimental results showed that the suitable location of methyl acetate and n-butanol was 2/5 at the top of the tower and from the top of the tower, the feed amount of n-butanol was 15m L/min, the feed alcohol ratio was 1:1.2, and the reflux ratio was 1. Under this condition, the conversion of n-butyl alcohol can reach 90.17%, and the content of n-butyl ester in the kettle is 86.24%, which is higher than the related literature. At the same time, the content of methyl acetate in the top of the tower is 22.11%, which is far away from the azeotropic composition point, and the subsequent separation process is simple. The experimental rules are in good agreement with the computer simulation results, and provide basic data for further research.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ225.24;TQ028.31

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