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Treatment method and system for high concentration salt-containing wastewater for production of nigrosine

A high-concentration salt-containing, treatment method technology, applied in the field of chemical wastewater treatment, can solve the problems of high operating costs, secondary pollution, and cannot be directly utilized, and achieve the effect of avoiding secondary pollution.

Inactive Publication Date: 2015-01-07
SHANGHAI BODAN ENVIRONMENTAL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This distillation desalination method has high operating costs, and the generated waste residue cannot be directly used because it contains some volatile organic compounds and synthetic reaction intermediates. It can only be treated as industrial hazardous waste, which can easily cause secondary pollution.

Method used

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  • Treatment method and system for high concentration salt-containing wastewater for production of nigrosine
  • Treatment method and system for high concentration salt-containing wastewater for production of nigrosine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Nigrosine production high-concentration saline wastewater treatment system includes: 20m 3 1 volumetric wastewater storage tank, 3 lifting pumps, 1 set of integrated alkali precipitation and separation device, 1 set of three-stage extraction device, 1 set of pH value adjustment device, 1 filter element precision filter, 5m 3 Capacity brine tank 1, 5m 3 Volume acid tank 1, 5m 3 1 volume alkali tank, 1 acid circulation pump, 1 alkali circulation pump, 1 brine circulation pump, 1 bipolar membrane device, and 1 heat exchange device for circulating cooling water.

[0031] A treatment method and system for producing high-concentration saline wastewater from nigrosine, comprising the following steps and process:

[0032] (1) Preprocessing process:

[0033]1) The high-concentration saline wastewater collected separately from the nigrosine crude product section is lifted from the wastewater storage tank to the integrated alkali precipitation separation device in batches throu...

Embodiment 2

[0045] Nigrosine production high-concentration saline wastewater treatment system includes: 15m 3 1 volumetric wastewater storage tank, 3 lifting pumps, 1 set of integrated alkali precipitation and separation device, 1 set of three-stage extraction device, 1 set of pH value adjustment device, 1 filter element precision filter, 3m 3 Volume salt water tank 1, 3m 3 Volume acid tank 1, 3m 3 1 volume alkali tank, 1 acid circulation pump, 1 alkali circulation pump, 1 brine circulation pump, 1 bipolar membrane device, and 1 heat exchange device for circulating cooling water.

[0046] A treatment method and system for producing high-concentration saline wastewater from nigrosine, comprising the following steps and process:

[0047] (1) Preprocessing process:

[0048] 1) The high-concentration saline wastewater collected separately from the nigrosine crude product section is lifted from the wastewater storage tank to the integrated alkali precipitation separation device in batches t...

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Abstract

The invention relates to the technical field of wastewater from chemical industry and particularly relates to a treatment method and system for high concentration salt-containing wastewater for production of nigrosine. The method comprises the following steps: carrying out alkali precipitation, extraction and filtration on high concentration salt-containing wastewater for production of nigrosine to remove organic matters and suspension colloids in the wastewater; and desalting the pre-treated high concentration salt-containing wastewater for production of nigrosine by virtue of a bipolar membrane device, and directly converting sodium chloride in the wastewater into hydrochloric acid and sodium hydroxide solutions with corresponding concentrations. The treatment method and system for high concentration salt-containing wastewater for production of nigrosine, provided by the invention, are free from secondary pollution and solid wastes. The removed salt can be directly converted into hydrochloric acid and sodium hydroxide solutions with certain concentrations so as to be returned to the front end alkali precipitation process. The treatment method and system have the advantages of being good in desalting effect, saved in resource and energy, simple in process, low in operating cost and the like.

Description

technical field [0001] The invention relates to the technical field of chemical wastewater treatment, in particular to a treatment method and a treatment system for producing high-concentration saline wastewater (nigrosine mother liquor) produced by nigrosine. Background technique [0002] Nigrosine is a black dye that is insoluble in common solvents. At present, most of them are made into commercial nigrosine and sold as organic pigments. The products include oil-soluble nigrosine (referred to as oil-soluble black), alcohol-soluble nigrosine (abbreviated as alcohol-soluble black), etc. Aniline black has strong tinting strength, low dispersion energy, very strong light absorption performance, and very good color stability. Due to its strong binding properties in paints, the pigment can also produce a matting effect (with a soft appearance). [0003] Nigrosine is suitable for acrylic resins, unsaturated polyester resins, cellulose resins, phenolic resins, polyester alkyd re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36
CPCC02F9/00C02F1/26C02F1/469C02F1/5236C02F1/66C02F2101/308C02F2103/36
Inventor 武广董杰
Owner SHANGHAI BODAN ENVIRONMENTAL ENG TECH
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