Method for preparing potassium carbonate dihydrate and ammonium sulfate from wastes produced in process for producing sodium cyanate by urea method

A technology of potassium carbonate and sodium cyanate, applied in chemical instruments and methods, separation methods, ammonium sulfate and other directions, can solve problems such as high power consumption, and achieve the effects of increasing economic benefits and reducing 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

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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 dihydrate and ammonium sulfate from wastes produced in process for producing sodium cyanate by urea method
  • Method for preparing potassium carbonate dihydrate and ammonium sulfate from wastes produced in process for producing sodium cyanate by urea method

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Effect test

Embodiment 1

[0029] A method for producing sodium cyanate gained waste by urea method to prepare dihydrate potassium carbonate and ammonium sulfate, comprising the steps:

[0030] 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;

[0031] 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;

[0032] 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 an...

Embodiment 2

[0036] A method for producing sodium cyanate gained waste by urea method to prepare dihydrate potassium carbonate and ammonium sulfate, comprising the steps:

[0037] 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;

[0038] 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;

[0039]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;

[0040] D: the ammonium sulfate crystal obtained in step C is pulverized through a f...

Embodiment 3

[0043] A method for producing sodium cyanate gained waste by urea method to prepare dihydrate potassium carbonate and ammonium sulfate, comprising the steps:

[0044] 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;

[0045] 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;

[0046] 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;

[0047] D: the ammonium sulfate crystal obtained in step C is pulverized through a ...

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Abstract

The invention provides a method for preparing potassium carbonate dihydrate and ammonium sulfate from wastes produced in a process for producing sodium cyanate by a urea method. The method comprises the following steps of: preparing potassium carbonate trihydrate and ammonium sulfate from wastes produced in the process for producing the sodium cyanate by the urea method, including ammonia, carbondioxide and water, which serve as main materials, and potassium sulfate serving as a cheap industrial raw material in a carbonizer; performing evaporation concentration on the potassium carbonate trihydrate; and cooling to obtain the potassium carbonate dehydrate. The method gives full play to the potential value of the wastes obtained in the process for producing the sodium cyanate by the urea method, reduces environmental pollution and increases economic benefit of an enterprise.

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 dihydrate and ammonium sulfate from the waste obtained by producing sodium cyanate with 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 cyana...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/73C01C1/24C01D7/00
CPCY02P20/151
Inventor 王嘉兴
Owner 南通亚伦化工有限公司
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