公开(公告)号：US06306357B1

公开(公告)日：2001-10-23

申请号：US08505338

申请日：1995-10-25

申请人： Erik Simonson ,  Mats Wallin ,  Sune Bengtsson ,  Erik Dahlqvist

发明人： Erik Simonson ,  Mats Wallin ,  Sune Bengtsson ,  Erik Dahlqvist

IPC分类号： B01D5352

CPC分类号： B01D53/1462 ,  B01J2219/3221 ,  B01J2219/32408 ,  D21C11/06 ,  D21C11/10 ,  Y02P70/24

摘要： A process and an apparatus in black-liquor evaporation for the selective removal, by liquid absorption, of hydrogen sulphide from the generated gas (3) containing hydrogen sulphide as well as carbon dioxide, an disclosed. In the process, the gas is counter-currently brought into multistage contact, preferably comprising three stages (6, 7, 8), with circulating carbonate-containing alkaline solutions, preferably sodium carbonate solutions (25), the pH of which is adjusted during the absorption to about 9-12 by the addition of a hydroxide, preferably a sodium hydroxide solution (26, 27, 28). It is preferred that the gas flow is turbulent and the liquid flow is laminar when contacted with one another. The apparatus comprises a container (1) having a gas inlet (2), a gas outlet (4), and a packing (9) arranged in several successive stages (6, 7, 8). The apparatus has means (25) for supplying a carbonate-containing solution to the last stage and through this stage countercurrently to the gas, and for recycling the solution across this stage; conduits (29, 30) arranged between the stages for supplying a partial flow of the solution from one stage to a preceding stage; means (26, 27, 28) for supplying a hydroxide to the carbonate-containing solution in at least one of the stages (6, 7, 8); and an outlet conduit (31) from the first stage, as seen in the feed direction of the gas, for discharging a sulphide-containing liquid.

摘要翻译： 公开了一种黑液蒸发的方法和装置，用于通过液体吸收从产生的含硫化氢气体（3）和二氧化碳中选择性除去硫化氢。 在该过程中，气体反向进入多级接触，优选包括三个阶段（6,7,8），其中循环含碳酸盐的碱性溶液，优选碳酸钠溶液（25），其pH值在 通过加入氢氧化物，优选氢氧化钠溶液（26,27,28）吸收至约9-12。 优选气体流动是湍流的，并且在彼此接触时液体流动是层流的。 该装置包括具有气体入口（2），气体出口（4）和以几个连续阶段（6,7,8）排列的填料（9）的容器（1）。 该装置具有用于将最终阶段供给含碳酸盐溶液的装置（25），并且通过该阶段与气体逆流并且用于在该阶段循环溶液; 布置在各个级之间的管道（29,30），用于将溶液的一部分流从一个级提供到前一级; 用于向至少一个级（6,7,8）中的含碳酸盐溶液供应氢氧化物的装置（26,27,28）; 以及来自第一级的出口导管（31），如在气体的进给方向上看到的，用于排出含硫化物液体。