丙酮精制工段的过程模拟研究

Simulation of an acetone refining process

以丙酮精制工段为研究对象,采用DSO流程模拟平台对该工段进行模拟计算。在现有装置的基础上,分别考察了粗丙酮塔回流比、采出量、精丙酮塔回流比、塔顶采出量、侧线采出量和采出位置等参数对分离效果的影响。结果表明:对于处理量为19100 kg/h的待分离物料,粗丙酮塔回流比为2.0、塔顶采出量为7320 kg/h、精丙酮塔回流比为2.2、塔顶馏出量为16235 kg/h、侧线采出为5974.5 kg/h、采出位置在第2块板时,可以使塔釜中几乎不含丙酮,且采出丙酮纯度达到99.81%。比较工厂实际生产值和模拟值,确定了较优的操作条件,提出了将粗丙酮塔塔顶物流预热进料物流的节能措施,可节省水蒸气(0.4 MPa)3.99 t/h、冷却水130.3 t/h。

A directed searching optimization（ DSO） process simulation platform has been used to simulate an acetone refining process. Based on existing equipment,the effect of varying several operating parameters-such as reflux ratio and accumulated production of crude acetone in the column,reflux ratio,and tower top output and side cutting position of the pure acetone column-on the separation efficiency has been investigated. The simulation results show that when the capacity of unsegregated mixtures is 19100 kg/ h,the reflux ratio of the crude acetone column is 2. 0,the crude tower top output is 7320 kg/ h,the reflux ratio of pure acetone column is 2. 2,the pure acetone tower top output is 16235 kg/ h,and the side-draw is 5974. 5 kg/ h,with a second stage side cutting. By comparing the simulated values with actual operating values in the plant,better operating conditions can be determined. An energysaving measure,whereby the tower top material flow in the crude acetone tower can be used to preheat the feed is proposed,which can reduce vapor（ 0. 4 MPa） flow to 3. 99 t/ h and circulating cooling water flow to 130. 3 t/ h.