Method for preparing potassium carbonate monohydrate and ammonium sulfate from waste obtained from producing sodium cyanate by urea method

A technology of potassium carbonate and sodium cyanate, applied in chemical instruments and methods, separation methods, ammonium sulfate, etc., can solve the problems of high power consumption, increase economic benefits, and reduce environmental pollution

Inactive Publication Date: 2012-05-23
南通亚伦化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is widely used because of the easy availability of raw materials, high potassium utilization rate, and no three wastes, but it consumes more power

Method used

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  • Method for preparing potassium carbonate monohydrate and ammonium sulfate from waste obtained from producing sodium cyanate by urea method
  • Method for preparing potassium carbonate monohydrate and ammonium sulfate from waste obtained from producing sodium cyanate by urea method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method that produces sodium cyanate gained waste with urea method to prepare potassium carbonate monohydrate and ammonium sulfate, comprises the steps:

[0031] A: 200kg of industrial potassium sulfate is dissolved in water, made into aqueous potassium sulfate solution, and sent in the carbonization tower (1), according to the ratio of the quality of potassium sulfate, ammonia, carbon dioxide is 1: 0.02: 0.07 to the carbonization tower (1 ) into ammonia and carbon dioxide to carry out carbonization reaction;

[0032] B: the reaction product obtained in step A is filtered through a suction filter pump (2) to obtain a clear filtrate and a filter cake of black impurities;

[0033] C: the clarified filtrate of step B gained is sent in the decompression distiller (3), carry out fractional distillation according to the freezing point of potassium carbonate and ammonium sulfate and cool in cooling tower (4), thereby obtain potassium carbonate trihydrate crystal respe...

Embodiment 2

[0037] A kind of method that produces sodium cyanate gained waste with urea method to prepare potassium carbonate monohydrate and ammonium sulfate, comprises the steps:

[0038] A: Dissolve industrial potassium sulfate in water to form an aqueous solution of potassium sulfate, and send it to the carbonization tower (1). Ammonia and carbon dioxide are introduced into the middle to carry out carbonization reaction;

[0039] B: the reaction product obtained in step A is filtered through a suction filter pump (2) to obtain a clear filtrate and a filter cake of black impurities;

[0040]C: the clarified filtrate of step B gained is sent in the decompression distiller (3), carry out fractional distillation according to the freezing point of potassium carbonate and ammonium sulfate and cool in cooling tower (4), thereby obtain potassium carbonate trihydrate crystal respectively and ammonium sulfate crystals;

[0041] D: the ammonium sulfate crystal obtained in step C is pulverized ...

Embodiment 3

[0044] A kind of method that produces sodium cyanate gained waste with urea method to prepare potassium carbonate monohydrate and ammonium sulfate, comprises the steps:

[0045] A: Dissolve industrial potassium sulfate in water to form an aqueous solution of potassium sulfate, and send it to the carbonization tower (1). Ammonia and carbon dioxide are introduced into the middle to carry out carbonization reaction;

[0046] B: the reaction product obtained in step A is filtered through a suction filter pump (2) to obtain a clear filtrate and a filter cake of black impurities;

[0047] C: the clarified filtrate of step B gained is sent in the decompression distiller (3), carry out fractional distillation according to the freezing point of potassium carbonate and ammonium sulfate and cool in cooling tower (4), thereby obtain potassium carbonate trihydrate crystal respectively and ammonium sulfate crystals;

[0048] D: the ammonium sulfate crystal obtained in step C is pulverized...

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Abstract

The invention provides a method for preparing potassium carbonate monohydrate and ammonium sulfate from the waste obtained from producing sodium cyanate by a urea method. In the method, the potassium carbonate monohydrate is prepared by taking waste ammonia, carbon dioxide, and water obtained from producing the sodium cyanate by the urea method as raw materials, simultaneously producing potassiumcarbonate trihydrate and the ammonium sulfate in a carbonizer by matching with a low-cost industrial raw material, namely potassium sulphate, and evaporating, concentrating and cooling the potassium carbonate trihydrate. The method gives full play to an intrinsic value of the waste obtained from producing the sodium cyanate by the urea method, reduces environmental pollution and increases economic benefit of enterprises.

Description

technical field [0001] The invention relates to the field of treatment and utilization of industrial waste gas, in particular to a method for preparing potassium carbonate monohydrate and ammonium sulfate from waste obtained by producing sodium cyanate through a urea method. Background technique [0002] Sodium cyanate (sodium cyanate, or cyanic acid sodium salt), sodium cyanate can be used as a quenching agent in steel processing. In the production of herbicides, fungicides, and insecticides, it is used to replace phosgene to synthesize various types of isocyanates to produce carbamates or replace urea pesticides. As a pharmaceutical intermediate, it can produce drugs for Parkinson's disease, diabetes, epilepsy and other diseases. Sodium cyanate is also used as a dye intermediate and as a catalyst in the production of acrylic polymers to maintain the whiteness of the fibers. Sodium cyanate can also be used as a photoinitiator. [0003] The synthetic method of sodium cyan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/73C01C1/24C01D7/00
Inventor 王嘉兴
Owner 南通亚伦化工有限公司
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