A purification and concentration process for waste dilute sulfuric acid

Abstract

The invention discloses a technological process of adding medicament to waste sulfuric acid for decolorization, tail gas absorption, membrane filtration of impurities, blowing off of organic matter in acid, and then carrying out negative pressure evaporation and concentration, including process optimization of waste acid concentration and filtration, key reactor The optimization and adjustment of the form, process parameters and layout, as well as the use of new decolorization reactors, and the special design of evaporation towers; the equipment mainly includes mixers, membrane filtration, stripping towers, and concentration evaporation towers, etc. The characteristic steps of the process mainly include: 1), the dilute sulfuric acid containing color and the decolorizing oxidant enter the mixer; 2), the tail gas after the reaction is pumped to the tail gas treatment system by a fan; 3), the reacted impurities are separated by a membrane filtration system ; 4), the waste sulfuric acid through the removal of organic matters is pumped into the evaporation tower for evaporation and concentration.

Description

technical field [0001] The invention relates to the technical field of recycling waste acid in the environmental protection industry, in particular to a process for purifying and concentrating waste dilute sulfuric acid. Background technique [0002] As we all know, sulfuric acid is the most active binary inorganic strong acid, which can react with most metals. High-concentration sulfuric acid has strong water absorption and can be used as a dehydrating agent. It is highly corrosive and oxidizing, and is a An important industrial raw material, which can be used to manufacture fertilizers, medicines, explosives, pigments, detergents, batteries, etc., and is also widely used in industries such as purification of petroleum, metal smelting, and dyes; when used for drying gases in industrial production, usually gas There will be a small amount of methanol, methyl chloride, dimethyl ether, organic matter and other components in it, and some organic matter will react with sulfuric ...

AI Technical Summary

Problems solved by technology

Usually the organic matter in dissolved acid cannot be separated by conventional methods, resulting in the inability to recycle and reuse this part of waste acid, causing the pressure of environmental pollution

[0003] When the waste dilute sulfuric acid is treated in industrial production, the method of reducing neutralization is usually used for treatment, but the treatment operation cost is relatively high, and it is difficult to achieve the purpose and requirements of enterprise recycling, which limits the use value of waste acid

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