Dilute sulfuric acid concentration method in chlorine gas drying process

Abstract

The invention discloses a dilute sulfuric acid concentration method in a chlorine drying process, which comprises the following steps: 1) mixing dilute H2SO4 with MgSO4, stirring to obtain a turbid solution, aging and filtering to obtain concentrated H2SO4; 2) cleaning the filter cake I with ethanol to obtain a filter cake II; 3) thermally drying the filter cake II to obtain discharged wet flue gas and dry powder; 4) performing rotary evaporation on the cleaning solution to obtain an alcohol-water mixed gas and a viscous solid; 5) fractionating the discharged wet flue gas and the alcohol-water mixed gas to obtain 95% ethanol; and (6) the powder is dried, and the viscous solid is mixed into dried new MgSO4 to serve as the MgSO4 raw material in the step (1). According to the method disclosed by the invention, MgSO4 drying is industrially implemented for the first time, the feasibility of recycling and cleaning by adopting 95% ethanol during MgSO4 crystallization, precipitation and filtration is considered, the whole cost is relatively low, and the green circular economy requirement is met; the concentration of a concentrated sulfuric acid product reaches 98% and is far higher than that of an evaporation concentration process in the prior art; concentrated sulfuric acid transfer is little, and safety is high.

Description

Technical field [0001] The present invention relates to the processing of treatment techniques of acetylene method, and more particularly to a dilute sulfate in a chlorine drying process. Background technique [0002] Currently, HCl gas required by acetylene method is typically used to combustion high temperature synthesis in chlorine gas. The quality grade of the HCL gas does not meet the production requirements. [0003] At present, chlorine gas drying is generally cleaned to dry, producing a large amount of dilute sulfuric acid waste liquid, and the treatment of dilute sulfuric acid waste is mainly used to transfer two paths, which is more in line with green production requirements in the park. [0004] The existing dilute sulfuric acid contempt is mainly used to degenerate the fog, in which the stimulation of sulfate is very stimulating, it will cause more serious pollution, especially the production safety, There is an accident. [0005] Carefully analyze, chlorine gas dryin...

AI Technical Summary

Problems solved by technology

[0004] However, the existing dilute sulfuric acid concentration process mainly adopts the method of evaporating water at high temperature and removing acid mist, in which sulfuric acid mist is very irritating, and a little carelessness will cause serious pollution, especially the production safety is low. there was an accident

[0005] After careful analysis, more than 93% concentrated sulfuric acid is used as a desiccant for chlorine drying, and the concentration of sulfuric acid produced by reflux is about 75%, or even dilute sulfuric acid with a lower concentration, but it still has a large viscosity, and it is inconvenient to transport and handle. Concentrated sulfuric acid obtained by evaporation or multi-effect evaporation has too much acid mist, which requires higher requirements for acid mist adsorbers

Images