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曼海姆法硫酸钾联产氯化氫的工艺特点

返回打印发布时间：2012/12/6 点击：11317

1.采用“吸收-解吸”的方法有效地分离氯化氫和空气。文献报道氯化氫与空气的分离可采用冷冻液化的方法。本工艺以稀盐酸（质量分数为20）为吸收介质在相对较低的温度（25C左右）吸收氯化氫气体，再在相对较高的温度下解吸出吸收的氯化氫，稀盐酸循环用于“吸收-解吸”氯化氫，使氯化氫与空气有效分离。与冷冻液化分离的方法相比，投资少、能耗低。

2.采用浓盐酸洗涤氯化氫，有效除去氯化氫气体中氯化钾粉尘和硫酸杂质。文献报道可用浓硫酸洗涤除去氯化氫气体中的硫酸和氯化钾杂质，洗涤后氯化氫气体中的硫酸和氯化钾含量可分别达到0.5~0.1mg/Nm3和0.05~0.02mg/Nm3。为尽可能完全除去氯化氫气体中的硫酸和氯化钾等非挥发性杂质,以避免其在后面的“吸收-解吸”循环过程中累积,本工艺以盐酸作洗涤介质,用一个冷却洗涤器和3个填料塔对氯化氫气体进行“三级梯度”洗涤。洗涤后气体中氯化钾含量降低到0.002mg/Nm3以下(原子吸收分光光度法),有效解决了非挥发性杂质在“吸收-解吸“过程中的积累。洗涤塔排出含硫酸10%(质量分数)的混酸作为商品出售。

3.采用降膜吸收及尾气洗涤技术,使尾气排放符合国家标准。氯化氫的吸收采用二次降膜吸收,有效地移出氯化氫吸收过程中放出的反应热并使吸收完全。用3个填料塔,以水为介质对尾气进行“三级梯度”回收洗涤,使排放尾气中氯化氫含量达到20mg/Nm3,排放量0.0064kg/h远低于国家排放标准。

4.采用冷冻和酸雾捕集技术,使精制后氯化氫含水质量分数<0.05%。解析出的氯化氫气体经循环水冷却、-15℃盐水冷却,控制温度<5℃经酸雾捕集器过滤除去酸雾,含水<0.05%(质量分数)。

5.精制後氯化氫産品技術指標爲:ω(HCl)>99.9%,ω（O2）<0.001%,ω(CO2<0.001%,ω(N2)<0.001%,ω(H2O)<0.05%,沒有遊離氯和H2。

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