降低丙烯酸丁酯装置丁醇消耗量

由于中国石油兰州石化公司丙烯酸丁酯装置原料丁醇消耗量高于设计值,所以对装置的酯化反应器、醇回收塔和薄膜蒸发器的操作条件进行了优化。结果表明,丙烯酸丁酯反应器最佳操作条件为:第一、第二酯化反应器压力分别为50,32 kPa,温度97～98℃,丁醇/丙烯酸(摩尔比)1.00∶1.16,催化剂用量30 kg/h。醇回收塔最佳操作条件为:塔顶压力88 kPa,氢氧化钠加入量30 kg/h,塔釜温度97～98℃。薄膜蒸发器最佳操作条件为:进料量2.0～2.5 t/h,底部温度122～126℃。在此优化条件下,丙烯酸平均转化率为98.2%;醇回收塔运行周期由20 d延长至3个月;薄膜蒸发器出口重酯物中平均丙烯酸丁酯质量分数达到1.2%,减少了产品损失。

Reducing butanol consumption in butyl acrylate unit

The operating conditions of esterification reactor,butanol recovery tower and membrane evaporator in a butyl acrylate unit of Lanzhou Petrochemical Company were optimized because the butanol consumption was higher than design value.The results showed that the optimum condition of esterification reactor was the pressure of first and the second reactors 50,32kPa respectively,temperature 97-98℃,the mole ratio of butanol to acrylic acid 1.00∶1.16,amount of catalyst 30kg/h.The optimum condition of butanol recovery tower was the pressure on top of tower 88kPa,amount of sodium hydroxide 30kg/h,the temperature at tower bottom 97-98℃.The optimum condition of membrane evaporator was the feeding amount 2.0-2.5t/h,the operating temperature 122-126℃.Under these optimum conditions,the average conversion of acrylic acid was 98.2%,the running period of butanol recovery tower was prolonged from 20d to three months.The mass fraction of butyl acrylate in heavy ester of membrane evaporator was 1.2%,the loss of product was reduced.