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Waste salt refining device and process in chemical industry

A technology of industrial waste salt and refining device, applied in incinerators, alkali metal chlorides, chemical instruments and methods, etc., can solve the problems of incomplete incineration, non-reuse, secondary pollution, etc.

Active Publication Date: 2015-06-03
JIANGSU ZHONGDAN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High-concentration salt-containing wastewater can be treated by direct incineration with waste liquid incinerator, which has high energy consumption, incomplete incineration, and salt slag contains many impurities and cannot be reused.
It can only be stacked, which will inevitably cause secondary pollution

Method used

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  • Waste salt refining device and process in chemical industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add ethanol, p-nitrochlorobenzene, and phase transfer catalyst into the reaction kettle, add 50-75% NaOH solution dropwise, and react at 60-65°C. After the reaction is finished, dilute with heated water, so that the salt in the lower layer is dissolved in water and reach the saturated concentration of sodium chloride, then stand still and separate layers. Remove the reaction product in the upper layer and the waste brine in the lower layer, add hydrochloric acid to adjust the pH value, so that the pH value is 1-3, remove tar and azo through activated carbon adsorption, and then remove p-nitrophenol by adsorption on macroporous resin, and remove the p-nitrophenol after adsorption The brine was adjusted to neutral with NaOH. Evaporate and crystallize through MVR, centrifuge to obtain solid salt, and then calcine the solid salt in a rotary kiln at a temperature of 400-750°C for 2-3 hours. The calcined salt is cooled and packaged for sale. The sodium chloride content in th...

Embodiment 2

[0023] Melt the solid o-nitrochlorobenzene into a liquid, put it into the reaction kettle, add ethanol and a phase transfer catalyst, add 75% liquid NaOH dropwise at 55-60 °C, after the reaction is completed, wash it with hot water, and let it stand Layering, adjust the salt-containing mother liquor to PH = 7, remove tar and azo through activated carbon adsorption, evaporate and crystallize the mother liquor through MVR, and centrifuge to obtain solid salt, and then calcinate the solid salt at a temperature of 400-750°C in a rotary kiln for 3 -4 hours, the calcined salt is made into a saturated solution, filtered through a precision filter, evaporated and crystallized by MVR, and centrifuged to obtain solid salt, which is packaged for sale after drying. The sodium chloride content in the salt was 95.5%, and the recovery rate reached 97%.

Embodiment 3

[0025]Add ethanol, p-nitrochlorobenzene, and phase transfer catalyst into the reaction kettle, add 50-75% NaOH solution dropwise, and react at 60-65°C. After the reaction is finished, dilute with heated water, so that the salt in the lower layer is dissolved in water and reach the saturated concentration of sodium chloride, then stand still and separate layers. Remove the reaction product in the upper layer and the waste brine in the lower layer, add hydrochloric acid to adjust the pH value, so that the pH value is 1-3, remove tar and azo through activated carbon adsorption, and then remove p-nitrophenol by adsorption on macroporous resin, and remove the p-nitrophenol after adsorption The brine was adjusted to neutral with NaOH. Evaporated and crystallized by MVR, centrifuged to obtain solid salt, and then calcined the solid salt in a rotary kiln at a temperature of 400-750°C for 2-3 hours, the calcined salt was made into a saturated solution, filtered through a precision filt...

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Abstract

The invention relates to a waste salt refining device and a waste salt refining process in the chemical industry. The device is characterized by comprising an adsorber, evaporating crystallizers, a centrifugal machine, a rotary kiln, a dissolver, a filter, an incinerator, a cooling tower and an exhaust tower, wherein the adsorber is connected with the centrifugal machine by virtue of a first evaporating crystallizer; the discharge opening of the centrifugal machine is connected with the rotary kiln; the discharge opening of the rotary kiln is connected with a dissolving tank; the dissolving tank is connected with a second evaporating crystallizer by virtue of the filter; the second evaporating crystallizer is connected with the centrifugal machine; the air outlet of the rotary kiln is connected with the incinerator; and the incinerator is connected with the exhaust tower by virtue of the cooling tower.

Description

technical field [0001] The invention belongs to a process for refining waste salt, in particular to a refining device and process for waste salt in the chemical industry. Background technique [0002] In the production of aminophenyl ether by using p-nitrochlorinated benzene and o-nitrochlorinated benzene; in the process of producing p-nitrophenol with p-nitrochlorinated benzene, a large amount of sodium chloride will be generated, resulting in a large amount of high salt, High COD, highly toxic wastewater. High-salt wastewater must be treated with effective treatment measures. Otherwise, serious environmental pollution will be caused. When the salt content in wastewater reaches 2%, it is difficult for bacteria to survive during biochemical treatment. Generally, the salt content in wastewater is controlled below 1.5%, and the control method is to dilute with water. With the higher and higher requirements for environmental protection, at present, water dilution is not allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/06F23G7/06C02F103/36
Inventor 毛永生李留德吴德生
Owner JIANGSU ZHONGDAN GROUP
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