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Purification of 2-Pyrrolidone by Falling Film Melt Crystallization
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-08-31 , DOI: 10.1021/acs.iecr.1c01250 Wei Chen 1 , Siqi Li 2 , Sifang Li 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-08-31 , DOI: 10.1021/acs.iecr.1c01250 Wei Chen 1 , Siqi Li 2 , Sifang Li 1
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Industrial grade 2-pyrrolidone with a purity of 99.5% is produced by aminolysis of γ-butyrolactone and subsequent fractional distillation, but it still contains trace amounts of γ-butyrolactone and other impurities. Falling film melt crystallization was applied for further purification of 2-pyrrolidone from 99.5% to a very high purity. The effects of the precooling temperature, feed rate, cooling rate, final crystallization temperature, heating rate, and final sweating temperature on the purity and yield of 2-pyrrolidone were studied. 2-Pyrrolidone was purified by falling film melt crystallization to a purity and yield of more than 99.9 and 73.3%, respectively. The mathematical model of falling film crystallization was applied for simulation of the crystal layer growth of 2-pyrrolidone. The simulated average thickness of the crystal layer was in good agreement with the experimental values, demonstrating the applicability of the model to falling film crystallization of 2-pyrrolidone.
中文翻译：
降膜熔融结晶法纯化2-吡咯烷酮
工业级2-吡咯烷酮由γ-丁内酯经氨解和分馏制得，纯度为99.5%，但仍含有微量γ-丁内酯等杂质。降膜熔融结晶用于将 2-吡咯烷酮从 99.5% 进一步提纯到非常高的纯度。研究了预冷温度、进料速度、冷却速度、最终结晶温度、加热速度和最终发汗温度对2-吡咯烷酮纯度和收率的影响。2-吡咯烷酮通过降膜熔融结晶纯化，纯度和收率分别超过99.9%和73.3%。应用降膜结晶的数学模型模拟2-吡咯烷酮的晶层生长。
更新日期：2021-09-15
中文翻译：
降膜熔融结晶法纯化2-吡咯烷酮
工业级2-吡咯烷酮由γ-丁内酯经氨解和分馏制得，纯度为99.5%，但仍含有微量γ-丁内酯等杂质。降膜熔融结晶用于将 2-吡咯烷酮从 99.5% 进一步提纯到非常高的纯度。研究了预冷温度、进料速度、冷却速度、最终结晶温度、加热速度和最终发汗温度对2-吡咯烷酮纯度和收率的影响。2-吡咯烷酮通过降膜熔融结晶纯化，纯度和收率分别超过99.9%和73.3%。应用降膜结晶的数学模型模拟2-吡咯烷酮的晶层生长。
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