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Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

引用

Chinese Journal of Chemical Engineering 2020年第4期28卷 1162-1170页

作者： Hongyin Pang Ruifang Lu Tao Zhang Li Lü Yanxiao Chen Shengwei Tang State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China School of Chemical Engineering Sichuan UniversityChengdu 610065China

In order to concentrate the diluted sulfuric acid from the titanium dioxide(TiO2)production of sulphate process,a new concentration process was proposed by coupling chemical dehydration and multi-effect *** ferrous sulfate monohydrate(FeSO4·H2O),as the dehydrant,was added to the diluted sulfuric acid to form ferrous sulfate heptahydrate(FeSO4·7H2O)according to the H2SO4-FeSO4-H2O phase diagrams,which partially removes the *** process was named as Chemical Dehydration *** residual water was further removed by two-effect evaporation and finally 70 wt%sulfuric acid was *** FeSO4·H2O can be regenerated through drying and dehydration of FeSO4·*** results show that FeSO4·H2O is the most suitable dehydrant,the optimal reaction time of chemical dehydration process is 30 min,and low temperature is favorable for the dehydration reaction.45.17%of the entire removed water can be removed by chemical dehydration from the diluted sulfuric *** chemical dehydration process is also energy efficient with 24.76%saving compared with the direct evaporation ***,51.21%of the FeSO4 dissolved originally in the diluted sulfuric acid are precipitated out during the chemical dehydration,which greatly reduces the solid precipitation and effectively alleviates the scaling in the subsequent multi-effect evaporation process.

关键词： Chemical dehydration multi-effect evaporation Sulfuric acid Titanium

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Case Studies of Heat Integration of evaporation Systems

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Chinese Journal of Chemical Engineering 2001年第2期9卷 224-227页

作者：冯霄 RobinSmith DepartmentofChemicalEngineering Xi＇anJiaotongUniversityXi＇an710049China DepartmentofProcessIntegration UMISTManchesterM601QDUK

In this paper, through two case studies, evaporation systems are considered in the context of overall process, and then are optimized to obtain energy-saving effect. The possible evaporation schemes are given when integrated with the background process and how to optimize the evaporator is shown. From the case studies, it can be seen that sometimes incomplete integration and heat pump evaporation are better than complete integration so should be considered as candidate retrofit schemes.

关键词： evaporation heat integration grand composite curve multi-effect evaporation vapour recompression evaporator

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