申请人:BASF SE
公开号:US10875769B2
公开(公告)日:2020-12-29
A process for treating an H2S- and CO2-comprising fluid stream, in which a) the fluid stream is treated in a first absorber at a pressure of 10 to 150 bar with a first substream of a regenerated H2S-selective absorbent to obtain a treated fluid stream and an H2S-laden absorbent; b) the H2S-laden absorbent is heated by indirect heat exchange with regenerated H2S-selective absorbent; c) the heated H2S-laden absorbent is decompressed to a pressure of 1.2 to 10 bar in a low-pressure decompression vessel to obtain a first CO2-rich offgas and a partly regenerated absorbent; d) the partly regenerated absorbent is regenerated in a desorption column to obtain an H2S-rich offgas and regenerated absorbent; e) the H2S-rich offgas is fed to a Claus unit and the offgas from the Claus unit is fed to a hydrogenation unit to obtain hydrogenated Claus tail gas; f) the hydrogenated Claus tail gas and the first CO2-rich offgas are treated in a second absorber at a pressure of 1 to 4 bar with a second substream of the regenerated H2S-selective absorbent to obtain a second CO2-rich offgas and a second H2S-laden absorbent; and g) the second H2S-laden absorbent is guided into the first absorber. Also described is a plant suitable for performance of the process. The process is notable for a low energy requirement.
一种处理含有 H2S 和 CO2 的流体流的工艺,其中 a) 在压力为 10 至 150 巴的第一吸收器中,用再生的 H2S 选择性吸收剂的第一子流处理流体流,得到处理过的流体流和含有 H2S 的吸收剂;b) 通过与再生的 H2S 选择性吸收剂进行间接热交换,加热含有 H2S 的吸收剂;c) 在低压减压容器中,将加热的含有 H2S 的吸收剂减压至压力为 1.2至10巴的低压减压容器中减压,得到富含CO2的第一种尾气和部分再生的吸收剂;d) 部分再生的吸收剂在解吸塔中再生,得到富含H2S的尾气和再生的吸收剂;e) 将富含H2S的尾气送入克劳斯装置,将克劳斯装置的尾气送入加氢装置,得到加氢克劳斯尾气;f) 将氢化克劳斯尾气和第一种富含 CO2 的尾气在压力为 1 至 4 巴的第二吸收器中用再生 H2S 选择性吸收剂的第二子流进行处理,以获得第二种富含 CO2 的尾气和第二种富含 H2S 的吸收剂;以及 g) 将第二种富含 H2S 的吸收剂导入第一吸收器。此外,还介绍了适用于该工艺的设备。该工艺的显著特点是能耗低。