粗二甲基亚砜除盐新工艺研究  

Study on a new technology of desalting from crude dimethyl sulfoxide

作　　者：石建明[1] 张绍军[1] 陶然[1] 

机构地区：[1]天津大学石油化工技术开发中心,天津300072

出　　处：《无机盐工业》2006年第12期37-38,50,共3页Inorganic Chemicals Industry

摘　　要：给出了硝酸钠在纯二甲基亚砜及二甲基亚砜水溶液中溶解度曲线。针对硝酸钠在二甲基亚砜溶液中溶解度特性及二甲基亚砜盐溶液的沸点,提出一种安全环保除盐新工艺,即:减压蒸发、加水降温结晶及离心过滤。实验证明采用此工艺使二甲基亚砜在蒸发过程中无盐析出,盐在加水降温结晶时析出,在控制降温速度的条件下,可得到较大且均匀的晶体颗粒,最后可把二甲基亚砜溶液中的盐脱除,解决了传统工艺存在的不环保和操作安全隐患问题。最后给出了工业装置的操作建议。The solubility curve of sodium nitrate in pure dimethyl sulfoxide（ DMSO） and in DMSO aqueous solution are given. A desalting technology, which is safe and environmental friendly, is proposed based on solublility characteristics of sodium nitrate in DMSO solution and the boiling point of DMSO saline solution, i. e. vacuum evaporation, cooling crystallization and filtration separation. The experimental results indicate that the salt is salted out in the cooling crystallization step and the big and uniform crystal can be obtained under the controlling the cooling speed. Finally,the salt in the DMSO solution can be removed. This technology can solve the problems of environmental pollution and unsafty operation existing in the traditional process. Meanwhile, an operation of industrial plant is suggested.

关 键 词：硝酸钠 二甲基亚砜 除盐 

分 类 号：TQ247.3[化学工程—有机化工]