文献类型：专利

英文题名：Preparing high-purity aqueous ammonia using membrane absorption method comprises e.g. evaporating liquid ammonia into ammonia gas, removing oil, high carbon oil, low-carbon oil and water-soluble oil from ammonia, filtering, and absorbing

作者：LI J;LIU Z;WEI Y;XU Z;MA X

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN103466656-B

公开日：2015-09-02

语种：英文

收录：DERWENT

摘要：NOVELTY - Preparing high-purity aqueous ammonia using membrane absorption method comprises (1) evaporating liquid ammonia into ammonia gas; (ii) removing oil form ammonia gas, removing high carbon oil from ammonia using a membrane, removing low-carbon oil using a chemical method, and removing water-soluble oil in the ammonia using a resin; (iii) filtering the resulting ammonia gas through the membrane to remove impurities; and (iv) absorbing the filtered ammonia gas through an absorption membrane to obtain high-purity aqueous ammonia. USE - The method is useful for preparing high-purity aqueous ammonia using membrane absorption method (claimed). ADVANTAGE - The method: produces ultra-clean high purity aqueous ammonia by achieving the quality of SEMI-C12%; has simple technique and low producing cost; and produces aqueous ammonia with high purity. Aqueous ammonia contains metal impurity content of not greater than 0.1 ppb, non-metallic impurity content of not greater than 30 ppb, and particles ( greater than or equal to 0.2 mu m) of less than or equal to 25/ml.