开发了一种与低温甲醇洗联产、采用热耦合精馏塔深冷精馏回收浓度99.9%以上的H₂S产品气的工艺，其回收率达到77%以上。该流程采用Aspen Plus模拟软件进行设计，使用增压透平膨胀机制冷并回收部分能量。以原料气处理量200 kmol/h为例，详细分析了膨胀端分配率对产品流量和浓度的影响、塔内组分分布状况和产品单耗。最终确定膨胀端的分配率为0.35时，浓度满足要求，回收率较高，硫化氢单耗为211.61 kWh/t。

A new process co-produced with rectisol process is developed to obtain 99.9% H₂S gas through cryogenic distillation in a thermocoupling distillation column.The recovery rate can exceed 77%.This process is designed by using Aspen Plus software and it uses booster expansion turbine to refrigerate and recover part of energy.In case of a 200 kmol·h^-1 raw gas handling capacity,the influence of distribution ratio at expansion-end on flow and concentration of product,the components distribution in column and unit consumption per product are analyzed in detail.Eventually,it is determined that the recovery concentration of H₂S can meet requirement with a high recovery rate and the unit energy consumption is 211.61 kWh per ton of H₂S when the distribution rate at expansion-end is 0.35.