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发明公开
CN106536405A 从含HCl的气体料流中回收HCl的方法 无效 - 驳回

从含HCl的气体料流中回收HCl的方法
摘要：
本发明涉及一种用于从含HCl气体料流中回收HCl的方法，其中将温度为-20℃至25℃的含HCl气体料流供至其中使其与作为吸收剂的水接触的绝热吸收单元，导致形成顶部气体料流和HCl产物水溶液，其中顶部气体料流的温度为至少70℃，并且其中所述HCl产物水溶液具有5-20重量％的HCl浓度。优选含HCl气体料流衍生自氢化步骤，其中使包含一氯乙酸(MCA)和二氯乙酸(DCA)的进料与氢气反应以形成含HCl气体料流和包含MCA和减少量的DCA的产物料流。优选将HCl产物溶液稀释至1-8重量％的浓度，并且经稀释的溶液在第二吸收步骤中用作吸收剂，其中使HCl从另外的含HCl气体料流中吸收以形成第二HCl水溶液。另外的含HCl气体料流优选衍生自氯化步骤，其中使乙酸与氯反应，导致形成另外的含HCl气体料流和包含一氯乙酸(MCA)和二氯乙酸(DCA)的进料。
摘要（英）：

The invention pertains to a method for recovering HCl from a HCl containing gas stream wherein a HCl containing gas stream with a temperature of -20 to 25deg c is provided to an adiabatic absorptionunit where it is contacted with water as an absorbent, resulting in the formation of a top gas stream and a aqueous HCl product solution, wherein the temperature of the top gas stream is at least 70deg c and wherein the aqueous HCl product solution has a HCl concentration in the range of 5-20 wt.%. It is preferred for the HCl-containing gas stream to be derived from a hydrogenation step wherein a feed comprising monochloroacetic acid (MCA) and dichloroacetic acid (DCA) is reacted with hydrogen to form a HCl-containing gas stream and a product stream comprising MCA and a reduced amount of DCA. The HCl product solution is preferably diluted to a concentration of 1-8 wt.%, and the diluted solution is used as absorbent in a second absorption step, wherein HCl is absorbed from a further HCl-containing gas stream to form a second aqueous HCl solution. The further HCl-containing gas stream is preferably derived from a chlorination step wherein acetic acid is reacted with chlorine, resulting in the formation of the further HCl-containing gas stream and a feed comprising monochloroacetic acid (MCA) and dichloroacetic acid (DCA).

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