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多胺精制系统的任务是脱除粗多胺中的苯胺和水,针对现有工艺存在的精制效果差、消耗高等问题,分别对影响汽提塔和干燥塔的因素进行了模拟分析,提出了相应的改进措施。改进后的流程,增加了汽提塔和干燥塔的理论板数,减少了直接蒸汽和氮气消耗;汽提塔底增设蒸发器,提高物料出口温度;利用汽提塔的直接蒸汽,增加二级蒸汽喷射系统,降低干燥塔的操作压力,减少了一个洗涤塔,提高了精制效果。改进后的工艺具有操作简化、消耗降低、质量提高等优点。
The task of polyamine purification system is to remove aniline and water from crude polyamines. According to the existing problems of poor purification efficiency and high consumption of existing polyamines, the factors influencing the stripper and drying tower are simulated and analyzed respectively. Corresponding improvement measures. The improved process increases the number of theoretical plates of the stripper and the drying tower and reduces the direct steam and nitrogen consumption. An evaporator is added at the bottom of the stripper to increase the outlet temperature of the material. The direct steam of the stripper is used to increase the second stage Steam injection system, reducing the operating pressure of the drying tower, reducing a scrubber to improve the refining effect. The improved process has the advantages of simplified operation, reduced consumption and improved quality.