Process for solving problem of high evaporation boiling point of ammonia chloride by using MVR

An ammonium chloride and boiling point technology, applied in the difficult process field, can solve the problems of decomposition of ammonium chloride, high ammonia nitrogen content in distilled water, discount of ammonium chloride recovery rate, etc., to reduce evaporation temperature, stabilize system operation, and solve recovery efficiency. low effect

Pending Publication Date: 2020-06-19
CNGR ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, when ammonium chloride wastewater is used to recover ammonium chloride, the evaporation boiling point temperature is generally 100°C--400°C. Ammonium chloride is easily decomposed at high temperature to form ammonia and hydrochloric acid, and the evaporation temperature of MVR is relatively high. Therefore, when using MVR to evaporate chlorine When ammonium chloride is recovered from ammonium chloride wastewater, it is easy to cause ammonium chloride to decompose, which greatly reduces the recovery rate of ammonium chloride in wastewater, and the content of ammonia nitrogen in distilled water is high

Method used

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  • Process for solving problem of high evaporation boiling point of ammonia chloride by using MVR

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Embodiment 1

[0022] A kind of technology that solves the difficult problem that ammonium chloride utilizes MVR evaporation boiling point to be higher, comprises the steps:

[0023] a. The ammonium chloride waste water enters the MVR feed system after being preheated, and the MVR feed system is connected with the preheated ammonium chloride waste water inlet N1 in the middle of the crystallization separator 1, and the preheated ammonium chloride waste liquid enters the crystallization through the N1 inlet separator 1;

[0024] b, the top of the crystallizer 1 is provided with a secondary steam outlet N4, N4 is sealed and connected with the compressor inlet through the pipeline 6, and the compressor takes out the secondary steam of the preheated ammonium chloride waste water to keep the air pressure in the crystallizer 1 at 65KPa, The temperature is 85°C, and the secondary steam passes through the ammonium chloride wastewater in step a to preheat the ammonium chloride wastewater, reduce the ...

Embodiment 2

[0032] A kind of technology that solves the difficult problem that ammonium chloride utilizes MVR evaporation boiling point to be higher, comprises the steps:

[0033] a. The ammonium chloride waste water enters the MVR feed system after being preheated, and the MVR feed system is connected with the preheated ammonium chloride waste water inlet N1 in the middle of the crystallization separator 1, and the preheated ammonium chloride waste liquid enters the crystallization through the N1 inlet separator 1;

[0034] b, the top of the crystallizer 1 is provided with a secondary steam outlet N4, N4 is sealed and connected to the compressor inlet through the pipeline 6, and the compressor takes out the secondary steam of the preheated ammonium chloride waste water to keep the air pressure in the crystallizer 1 at 85KPa, The temperature is 89°C, and the secondary steam passes through the ammonium chloride wastewater in step a to preheat the ammonium chloride wastewater, reduce the am...

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Abstract

The invention discloses a process for solving the problem of high evaporation boiling point of ammonia chloride by using MVR. The method comprises the following steps: preheating ammonium chloride wastewater, then feeding into a crystallization separator through an N1 inlet, wherein N2 is connected with a heater through a pipeline and a circulating pump, circularly feeding the heated ammonium chloride wastewater into a crystallization separator through an N3 inlet, carrying out cyclic heating evaporation, feeding an ammonium chloride concentrated solution into a cooling crystallization kettlethrough a discharge pump, and keeping the temperature in the crystallization kettle below 45 DEG C so that ammonium chloride crystals are produced. The system is stable in operation, high in automation degree and low in energy consumption, the evaporation temperature of the ammonium chloride is reduced, the ammonium chloride is prevented from being evaporated and decomposed at a high temperature,and the problem that ammonia chloride is easy to decompose due to the fact that the MVR evaporation boiling point is high is effectively solved.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a process for solving the problem of high boiling point of ammonium chloride using MVR evaporation. Background technique [0002] At present, when ammonium chloride wastewater is used to recover ammonium chloride, the evaporation boiling point temperature is generally 100°C--400°C. Ammonium chloride is easily decomposed at high temperature to form ammonia and hydrochloric acid, and the evaporation temperature of MVR is relatively high. Therefore, when using MVR to evaporate chlorine When ammonium chloride is recovered from ammonium chloride wastewater, ammonium chloride is easily decomposed, which greatly reduces the recovery rate of ammonium chloride in wastewater, and the content of ammonia nitrogen in distilled water is relatively high. MVR is a mechanical vapor recompression technology, which uses the secondary steam and its energy generated by the evaporation system itse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04
CPCC02F1/04
Inventor 凌跃红刘漫李卫华
Owner CNGR ADVANCED MATERIAL CO LTD
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