Abstract: A novel process, thermally coupled catalytic distillation for selective hydrogenation of C₃ alkyne into alkene, was proposed. Methylacetylene and propadiene were separated from propylene in propylene column, and converted into propylene at the same time by catalytic hydrogenation. Deethanizer and propylene distillation were thermally coupled by liquid and vapor streams. The proposed process had two advantages: reactive distillation can raise the selectivity of hydrogenation effectively; thermally coupled distillation columns could avoid propylene backmixing in deethanizer and then save energy. Simulation of the process was performed by using Aspen Plus software. Propylene yield increased by 0.74%—2.19%. At the same time, the annual cost for refrigeration was saved by 2.44%—3.61%. The simulation also showed that the novel process was especially suitable for heavy cracking feedstock.

Key words: computer simulation, reactive distillation, systems engineering

摘要： 提出了一种C₃选择性加氢能量耦合催化精馏新工艺，首先将催化精馏构件放置在丙烯精馏塔的提馏段，再将丙烯塔与脱乙烷塔通过气液流股连接成热耦合结构。与传统加氢工艺相比，能量耦合催化精馏工艺通过分离和加氢反应的结合使丙炔、丙二烯加氢过程的选择性得到较大幅度的提高，并通过热量耦合消除丙烯在脱乙烷塔内的返混，从而降低分离能耗。采用Aspen Plus化工流程模拟软件对该流程进行模拟。模拟结果表明，能量耦合催化精馏工艺可以使丙烯收率提高0.74%～2.19%，年度冷剂费用降低2.44%～3.61%。同时，热量耦合催化精馏工艺对于重质裂解原料油具有更好的适用性。

关键词: 计算机模拟, 反应精馏, 系统工程