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

A technology of sodium cyanate and sodium carbonate, applied in chemical instruments and methods, ammonium sulfate, alkali metal carbonate, etc., can solve problems such as loss, increase economic benefits and reduce environmental pollution

Active Publication Date: 2012-09-05
南通华山实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second defect of this method is that the utilization rate of the raw material salt is only 72% to 74%, and the rest of the salt is discarded as waste liquid along with the calcium chloride solution, which is a great loss

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing sodium carbonate monohydrate and ammonium sulfate from the waste obtained by producing sodium cyanate with the urea process, comprising the steps:

[0035] A: Send 500kg of industrial sodium sulfate to the carbonization tower (1), and feed ammonia and carbon dioxide into the carbonization tower (1) according to the mass ratio of sodium sulfate, ammonia, and carbon dioxide of 1:0.04:0.11 for carbonization reaction;

[0036] 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;

[0037]C: the clarified filtrate of step B gained is sent in the decompression distiller (3), carries out fractional distillation according to the freezing point of sodium carbonate and ammonium sulfate and cools in cooling tower (4), thereby obtains sodium carbonate decahydrate crystal respectively and ammonium sulfate crystals;

[0038] D: the ammonium sulfate crystal obt...

Embodiment 2

[0041] A method for preparing sodium carbonate monohydrate and ammonium sulfate from the waste obtained by producing sodium cyanate with the urea process, comprising the steps:

[0042] A: Send 200kg of industrial sodium sulfate to the carbonization tower (1), and feed ammonia and carbon dioxide into the carbonization tower (1) according to the mass ratio of sodium sulfate, ammonia, and carbon dioxide of 1:0.24:0.31 for carbonization reaction;

[0043] 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;

[0044] C: the clarified filtrate of step B gained is sent in the decompression distiller (3), carries out fractional distillation according to the freezing point of sodium carbonate and ammonium sulfate and cools in cooling tower (4), thereby obtains sodium carbonate decahydrate crystal respectively and ammonium sulfate crystals;

[0045] D: the ammonium sulfate crystal ob...

Embodiment 3

[0048] A method for preparing sodium carbonate monohydrate and ammonium sulfate from the waste obtained by producing sodium cyanate with the urea process, comprising the steps:

[0049] A: Send 300kg of industrial sodium sulfate to the carbonization tower (1), and feed ammonia and carbon dioxide into the carbonization tower (1) according to the mass ratio of sodium sulfate, ammonia, and carbon dioxide of 1:0.44:0.51 for carbonization reaction;

[0050] 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;

[0051] C: the clarified filtrate of step B gained is sent in the decompression distiller (3), carries out fractional distillation according to the freezing point of sodium carbonate and ammonium sulfate and cools in cooling tower (4), thereby obtains sodium carbonate decahydrate crystal respectively and ammonium sulfate crystals;

[0052] D: the ammonium sulfate crystal ob...

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Abstract

The invention provides a method for preparing monohydrate sodium carbonate and ammonium sulfate from wastes produced in a process for producing sodium cyanate by a urea method. In the method, a process for preparing the sodium cyanate by the urea method is combined with a process for preparing calcined soda by an ammonia-soda method, the wastes produced in the process for preparing the sodium cyanate by the urea method are used as raw materials used in the process for preparing the calcined soda by the ammonia-soda method, and simultaneously, sodium sulfate serving as low-cost industrial raw materials are utilized so as to produce the monohydrate sodium carbonate and coproduce ammonium sulfate, so the potential value of the wastes produced in the process for preparing the sodium cyanate by the urea method is given full play, environmental pollution is reduced, and the economic benefits of enterprises are increased.

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 sodium 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 cyanate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/00C01C1/24
Inventor 王嘉兴
Owner 南通华山实业有限公司
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