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Regeneration recycling method of sodium hydroxide

A technology of sodium hydroxide and sodium bicarbonate, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low production efficiency, complex production process, low purity of sodium hydroxide, etc. , to achieve the effect of improving conversion rate, improving work efficiency, and overcoming many processes

Inactive Publication Date: 2016-06-01
赵建英
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AI Technical Summary

Problems solved by technology

In the current sodium hydroxide regeneration cycle method, the technological process is not easy to implement, the purity of the generated sodium hydroxide is low, the single-pass conversion rate of the reactant is low, the production process is complicated, and the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0010] The sodium hydroxide regeneration circulation method of the present embodiment may further comprise the steps:

[0011] (1) First add calcium carbonate powder with a particle size of 420 μm into the sodium sulfate solution, sodium bisulfate solution, or a mixed solution of sodium sulfate and sodium bisulfate, according to the stoichiometric amount of sodium bicarbonate formed 30 times, and pass through Carbon dioxide or sulfuric acid is added to adjust the pH value of the solution to 60, so that the sodium sulfate salt is transformed into sodium bicarbonate, and filtered to obtain gypsum and sodium bicarbonate solution;

[0012] (2) Then add calcium oxide or calcium hydroxide to the sodium bicarbonate solution at 2.5 times the causticization chemical reaction of sodium bicarbonate for causticization reaction, filter to obtain calcium carbonate and regenerated sodium hydroxide solution, and return calcium carbonate to (1) Continue to use in the step, the sodium hydroxide...

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Abstract

The invention discloses a regeneration recycling method of sodium hydroxide. The method is mainly used for regeneration recycling use after usage of sodium hydroxide in metallurgical and chemical engineering process. The technological process is as follows: firstly adding calcium carbonate into a sodium sulfate salt solution, adjusting pH value of the solution by introducing carbon dioxide or adding sulfuric acid to convert sodium sulfate salt to sodium bicarbonate, filtering to obtain gypsum and a sodium bicarbonate solution, causticizing by adding lime into the sodium bicarbonate solution, filtering to obtain a regenerated sodium hydroxide solution and calcium carbonate, and continuously using calcium carbonate by returning calcium carbonate to sodium sulfate salt conversion process. The method of the invention has a simple technology, is convenient to operate and is economic and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a sodium hydroxide regeneration cycle method. Background technique [0002] The sodium hydroxide regeneration cycle method at least includes basic processes such as extraction, vacuum distillation, crystallization, and filtration. In the current sodium hydroxide regeneration cycle method, the technological process is not easy to implement, the purity of the generated sodium hydroxide is low, the single-pass conversion rate of the reactant is low, the production process is complicated, and the production efficiency is low. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art, the object of the present invention is to provide a sodium hydroxide regeneration cycle method, the present invention not only has a simple production process, improves work efficiency, but also produces high purit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/28
Inventor 赵建英
Owner 赵建英
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