四氯化钛精制尾气的综合利用研究

Study on comprehensive utilization of titanium tetrachloride refined tail gas

四氯化钛精制尾气成分复杂、毒性大,目前还未见成熟技术对其进行回收利用。对四氯化钛精制尾气的来源及物化特性做了全面研究,查明四氯化钛精制尾气的物质组成达20种以上,包含粗四氯化钛中的气相组分和液相组分,以四氯化钛和四氯化硅为主。提出了采用精馏法从四氯化钛精制尾气中分离富集回收四氯化钛和四氯化硅的方案。进行了精馏实验研究,回收的中段馏分中四氯化硅质量分数达到95%,精馏釜液中四氯化钛质量分数达到96.5%,四氯化钛回收率达到90%以上。该工艺为四氯化钛精制尾气的综合利用开辟了一条新途径。

Titanium tetrachloride refined tail gas is very complex and is a harmful gas with high toxicity.At present,no reliable technology has been found to recycle them.The composition and physical properties of titanium tetrachloride refined tail gas were comprehensive studied.More than 20 kinds of materials were identified in the tail gas.They are gas impurities and liquid impurities in the crude titanium tetrachloride.Among them,Ti Cl4 and SiCl4 are main components.The use of rectification method to separate TiCl4 and SiCl4 in titanium tetrachloride refined tail gas was proposed.The exhaust condensate rectification experiment was made.The mass fraction of SiCl4 was more than 95%which was gotten in the middle distillate.Residual TiCl4 in the reactor reached 96.5%,and recovery of titanium tetrachloride reached more than 90%.This research opens up a new approach for the disposal utilization of titanium tetrachloride refined tail gas.