化工外文文獻(xiàn)翻譯--用混合溶劑萃取精餾分離乙腈-乙酸乙酯(已修改)
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【正文】 Separation of acetonitrileethyl acetate by extractive distillation with mixed solvent Li Chunli1, Zong Lili2 and Fang Jing School of Chemical Engineering, Hebei University of Technology, Tianjin, 30013 Email:, Tel: +8602260202246 Abstract Computeraided molecular design (CAMD) approach was bring in this work for selecting extractive solvents. The separation of acetonitrileethyl acetate Azeotropic system was carried out through a batch extractive distillation processes with N,Ndimethylformamide(DMF), glycol(EG) and DMFEG mixture as solvents separately. The effects of different operating conditions were studied, solvents, ratio of mixed solvent, solvent flow rate and reflux ratio were all included. It was found that the mixed solvent DMFEG showed better separation effect than the single solvent. The best proportion of the mixed solvent was 3:7 ( the quality of DMF and EG )。 when the solvent flow rate and reflux ratio increased, the separation effect of mixed solvent improved。 under the conditions that solvent flow rate was 20 mL/min, reflux ratio was 2, quality fraction of ethyl acetate in the top product could reach %. Keywords Separation。 Batch extractive distillation。 Mixed solvents。 Acetonitrile。 Ethyl acetate Acetonitrile and ethyl acetate are widely used in chemical and pharmaceutical industries as chemical raw materials and good organic solvent[1]. But the two form azeotrope, ethyl acetate hold 77% and the other 23% is acetonitrile(mass fraction), mon distillation method can not make any effect. Therefore, some panies have to treat them as waste, this not only cause seriously waste of resources and economy, but also pollute the environment. At present, Di Jiandong[2]of Tianjin university has realized the separation of acetonitrileethyl acetate by heterogeneous batch azeotropic distillation, but the product received in this way have lower purity, but high energy consumption. According to the difference of solubility that acetonitrile and ethyl acetate in the water, Ma Wenchan [3]adopts the method of liquidliquid extractive which use water as extractive agent to separate acetonitrileethyl acetate ,the product of ethyl acetate can achieve %,but acetonitrile mixed with abundant water, so recovery of acetonitrile is very difficult. According to our knowledge, no authors have studied the separation of acetonitrile ethyl acetate by extractive distillation. In recent years, the application of extractive distillation[46]for the separation of closeboiling mixture has been widely accepted and mercialized over the conventional distillation which may also be feasible but with substantial column investment. However, due to the problem of selectivity and solubility are often inconsistent in single solvent, limit its application and development. Mixed solvents guarantee high selectivity, and improved solubility at the same time through the bination of main solvent and vice solvent[7]. In recent years, mixed solvents are applied more and more in extractive distillation[811] . This paper is devoted to the study of the separation of the mixture acetonitrile– ethyl acetate by using extractive batch distillation w
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