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A purification and concentration process for waste dilute sulfuric acid

A dilute sulfuric acid, process technology, applied in the direction of sulfur compounds, sulfur trioxide/sulfuric acid, inorganic chemistry, etc., can solve the difficult to achieve the purpose and requirements of enterprise recycling, waste acid cannot be recycled and reused, and the value of waste acid is limited and other problems, to achieve the effect of reducing equipment space layout, reducing equipment easy to block, and low cost treatment

Active Publication Date: 2022-02-01
南京蓝胜环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A purification and concentration process for waste dilute sulfuric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The oxidant tank 1 is communicated with the inlet of the mixer 2 through configuring 20% ​​hydrogen peroxide, and the top of the mixer 2 is communicated with the tail gas absorption tower 11 for tail gas treatment. achieve safe discharge.

Embodiment 2

[0036] The bottom of the mixer 2 is connected with the stirring reactor 3, and the stirring of the stirring reactor 3 can reduce the reaction time, accelerate the oxidation of organic components of the acid, and achieve the purpose of completely decolorizing the waste acid.

Embodiment 3

[0038] The waste acid impurity filtration system in the process includes two sets of filtration feed volume pump 16 and membrane filtration equipment 4. The membrane adopts PTFE material to enter and exit from the outside. Feed volume pump 16 communicates with membrane filtration equipment 4 to filter acid impurities. The top of membrane filtration equipment 4 communicates with stripping tower 5, the bottom of membrane filtration equipment 4 communicates with impurity collection tank 13, and the upper part of membrane filtration equipment 4 is provided with backwash structure, impurities enter the collection tank 13.

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90C01B17/88
Inventor 韦昌工祝晓芸曹倩黄金成
Owner 南京蓝胜环保科技有限公司
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