Abstract: The recovery unit for solvent and 1,3-butadiene is an important part of the nickel butadiene rubber production process and the energy consumption accounts for about 40% of that for the entire process. Therefore,it is the key process for improving the energy performance of the butadiene rubber production process. Raffinate oil was used as reaction solvent in a certain petrochemical enterprise with a six- column process as the recycling process before,and then the solvent was replaced by hexane solvent in order to save energy. The process was modified,such as reducing the reflux ratio of de-heavy oil column and collecting some bottom product of the recovered oil dehydration column directly. The solvent oil in the recovery unit of the considered petrochemical enterprise is replaced from raffinate oil to solvent hexane oil,and the corresponding technical retrofits have also been made. On the basis of the actual industrial data,the simulation models for this process before and after the retrofits are established via Aspen Hysys,and the results are compared with the actual data to prove the veracity. In the case of product quality in line with the production targets,comparing the separation performance and energy consumption,the results indicate that the energy consumption of the process is reduced by 15.25% after the retrofits,which shows a very significant energy-saving effect,and the reductions of energy consumption in the recovered oil dehydration column and de-heavy oil column are most obvious.

Key words: butadiene rubber, recovery unit for solvent and 1,3-butadiene, solvent hexane oil, process simulation, energy conservation

摘要： 溶剂及丁二烯回收装置是镍系顺丁橡胶生产工艺中的重要组成部分,其能耗占整个装置的40%左右,是顺丁橡胶生产过程中节能降耗的关键工序。某企业原本采用抽余油为溶剂,回收工艺采用六塔流程,后为降低能耗,将抽余油更换为己烷溶剂,并对原有工艺进行了相应改造,如降低溶剂脱重塔的回流量,并对回收油脱水塔塔底产物进行直采。本文结合其生产工艺改造前后的生产情况和实际生产操作数据,应用Aspen Hysys软件分别对改造前和改造后的溶剂回收流程进行建模和模拟,并与实际结果进行对比以验证模拟的准确性。在产品质量符合生产指标的情况下,对比分离要求和能耗,模拟结果表明改造后的流程总能耗降低15.25%,节能效果十分显著,其中回收油脱水塔和溶剂脱重塔的能耗降低最为明显。

关键词: 顺丁橡胶, 溶剂及丁二烯回收装置, 己烷溶剂, 模拟, 节能