Method for recycling nitrous oxide pre-washing water
A nitrous oxide, pre-washing technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of increased nitrous oxide preparation cost, waste of resources, etc., and achieves reduced preparation cost and high practicality. effect of value
Active Publication Date: 2020-02-28
宿州伊维特新材料有限公司
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Problems solved by technology
Directly discharging the prewash water will cause a waste of resources and increase the cost of the entire nitrous oxide preparation
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[0021] The recycling method of this nitrous oxide prewash water comprises the following steps:
[0022] A. Preparation: After the nitrous oxide is pre-washed, the pre-washed water contains nitrate ions;
[0023] B. Adjust the PH value: mix high-purity ammonia gas in the pre-wash water, neutralize the ammonia gas with the nitric acid in the pre-wash water to form ammonium nitrate, and separate the ammonium nitrate to obtain a primary treatment stock solution;
[0024] In the step B, the mass ratio of ammonia gas to prewash water is 1-2:100.
[0025] In the step B, the ammonium nitrate is granular and the ammonium nitrate is precipitated at the bottom.
[0026] Electrodialysis membrane stack concentration: the primary treatment raw liquid is treated by using several electrodialysis membranes to form a membrane stack concentration method, and purified water and waste water are obtained after treatment.
[0027] In this embodiment, the membrane concentration in step C is a low-t...
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The invention provides a recycling method of nitrous oxide pre-washing water, belonging to the technical field of chemical engineering. The recycling method overcomes the problem of high cost in the prior art. The recycling method of the nitrous oxide pre-washing water comprises the following steps: A, preparation: pre-washing nitrous oxide, wherein after pre-washing of nitrous oxide, pre-washingwater having undergone pre-washing treatment contains ammonium nitrate and nitrate ions; B, adjustment of a pH value: mixing high-purity ammonia gas with the pre-washing water, allowing ammonia gas and nitric acid in the pre-washing water to be neutralized to generate ammonium nitrate, and separating ammonium nitrate to obtain a primary treatment stock solution; C, electrodialysis membrane stack concentration: treating the primary treatment stock solution in a manner of membrane stack concentration formed by a plurality of electrodialysis membranes so as to obtain purified water and wastewaterafter treatment; and D, recycling and discharging: conveying the purified water obtained after membrane concentration to a feeding place used for preparation of nitrous oxide, feeding the purified water and a nitrous oxide raw material into the feeding place according to a set ratio, and directly discharging the wastewater having undergone membrane concentration because the ammonia nitrogen content of the wastewater reaches the discharge standard. The recycling method of the nitrous oxide pre-washing water is low in cost.
Description
technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for recycling nitrous oxide prewash water. Background technique [0002] During the preparation of nitrous oxide, a pre-washing process is required between the reactor and the purification system, and the ammonium nitrate in the nitrous oxide can be removed through the pre-washing process. [0003] Since the pre-washing is mainly to clean the nitrous oxide between the reaction kettle and the purification system through clean water, the pre-washing water after cleaning contains ammonium nitrate and nitrate ions. Directly discharging the pre-wash water will result in a waste of resources and increase the cost of the entire preparation of nitrous oxide. Contents of the invention [0004] The object of the present invention is to provide a method for recycling nitrous oxide pre-wash water that can appropriately reduce the preparation cost in view of the above-menti...
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IPC IPC(8): C02F9/06C02F9/10C02F101/16
CPCC02F1/447C02F1/4693C02F1/52C02F1/58C02F1/66C02F9/00C02F2101/16C02F2101/163C02F2209/06
Inventor 甘华平秦远望丁维刚马问
Owner 宿州伊维特新材料有限公司