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A kind of waste acid treatment method

A technology for waste acid treatment and acid concentration, applied in chemical instruments and methods, oxidized water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as environmental hazards and wastewater treatment difficulties, reduce treatment costs, and ensure recycling Effect of spent acid quality, treatment operation and equipment simplicity

Active Publication Date: 2019-07-09
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it contains highly corrosive inorganic acids such as sulfuric acid and nitric acid, the treatment of this type of wastewater is difficult, and careless treatment will cause great harm to the environment.

Method used

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  • A kind of waste acid treatment method
  • A kind of waste acid treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Waste acid: waste water produced by a nitrification process, the waste water contains nitric acid with a mass percentage concentration of about 2%, sulfuric acid with a mass percentage concentration of about 20%, acetic acid with a mass percentage concentration of about 12%, and a small amount of hydrocarbon organic matter, COD =8526 mg / L.

[0054] Such as figure 1 As indicated, wastewater treatment methods include:

[0055] (1) Pre-treatment: Add activated carbon to 500g of waste water. In terms of mass, the amount of activated carbon added is 0.1% of the waste acid mass, stirred and adsorbed for 30min, and then filtered to obtain waste residue and waste acid pretreatment solution. Waste residue can be used as fuel incineration , COD of waste acid pretreatment solution is 5613mg / L;

[0056] (2) Membrane evaporation and concentration: Concentrate the waste acid pretreatment liquid through the membrane, increase the acid concentration in the waste acid to 60%, and obta...

Embodiment 2

[0062] Waste acid: A sulfonation process produces waste acid, which contains about 28% sulfuric acid and a small amount of hydrocarbon organic matter, COD=9546mg / L.

[0063] The processing method of this waste acid comprises:

[0064] (1) Pretreatment: add diatomite to 500g of this waste acid, in terms of mass, the addition of diatomite is 0.2% of the waste acid mass, filter after stirring and absorbing, to obtain waste acid pretreatment liquid and waste residue, waste residue Incineration treatment, the COD of waste acid pretreatment liquid is 6845mg / L;

[0065] (2) Membrane concentration: Concentrate the waste acid pretreatment liquid through the membrane, increase the acid concentration in the waste acid to 60%, and obtain 250g of waste acid treatment liquid I and condensed waste water I;

[0066] (3) Heating and oxidation: Heating the waste acid treatment solution I, the heating temperature is controlled within 180-240°C, small molecular substances are volatilized and rem...

Embodiment 3

[0071] Waste water composition is with embodiment 1.

[0072] Wastewater treatment methods include:

[0073] (1) pre-treatment: add activated carbon in 500g waste water, by mass, the add-on of activated carbon is 0.1% of waste acid quality, filter after stirring and absorbing 30min, obtain waste residue and waste acid pretreatment liquid, waste residue can be used as fuel incineration, The COD of waste acid pretreatment solution is 5613mg / L;

[0074] (2) Membrane evaporation and concentration: Concentrate the waste acid pretreatment liquid through the membrane, increase the acid concentration in the waste acid to 50%, and obtain 300g of waste acid treatment liquid I and condensed waste water I;

[0075] (3) Heating and oxidation: Heating 300g of waste acid treatment solution I, the heating temperature is controlled within 180-240°C, the small molecular substances are volatilized and removed during the heating process, the volatilized small molecular substances are collected, ...

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Abstract

The invention discloses a waste acid treating method. The waste acid treating method comprises the following steps that firstly, waste acid is concentrated through membrane evaporation and concentration until the mass percentage of acid is 30-70%, and treated waste acid liquid I is obtained; secondly, the treated waste acid liquid I is heated to 180-240 DEG C, an oxidizing agent is added, organic substances in the waste acid are decomposed, and treated waste acid liquid II is obtained; thirdly, the treated waste acid liquid II is subjected to vacuum concentration until the mass percentage of acid is 85% or above. The treating method is simple in operation, low in treating cost and high in efficiency, and simple equipment is needed.

Description

technical field [0001] The invention relates to the field of resource utilization of waste acid, in particular to a method for treating waste acid. Background technique [0002] Nitration and sulfonation reactions are often used in modern industry to produce nitroalkanes and sulfoalkanes. In the nitration process, the commonly used nitrating agents mainly include concentrated nitric acid, fuming nitric acid, mixed acid of concentrated nitric acid and concentrated sulfuric acid (nitrogen-sulfur mixed acid) or dehydrating agent with nitrating agent, and commonly used dehydrating agents include concentrated sulfuric acid, glacial acetic acid, Acetic anhydride, phosphorus pentoxide; in the sulfonation process, commonly used sulfonating agents are concentrated sulfuric acid, oleum, chlorosulfonic acid and sulfur trioxide. [0003] The entire nitrification process or sulfonation process will be accompanied by the generation of a large amount of waste acid, which has caused great ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/08C02F1/72C02F1/02C02F101/16C02F101/10
CPCC02F1/02C02F1/08C02F1/72C02F2101/101C02F2101/163
Inventor 陈磊黄关火刘仲明王超沈振雄毛兵
Owner ZHEJIANG QICAI ECO TECH CO LTD