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Industrial method for continuously producing sodium bisulfite from byproduct Na2SO4

A technology of by-product sodium sulfate and sodium bisulfite, applied in the preparation of alkali metal sulfite, chemical instruments and methods, alkali metal sulfite/sulfite, etc., can solve the problem of sodium sulfate being worthless, Achieve the effect of avoiding clogging and ensuring reaction efficiency

Pending Publication Date: 2019-07-12
武汉青江化工黄冈有限公司
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Problems solved by technology

The applicant company will produce a large amount of sodium sulfate when producing veratraldehyde and veratrol, and the by-product sodium sulfate is worthless

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  • Industrial method for continuously producing sodium bisulfite from byproduct Na2SO4
  • Industrial method for continuously producing sodium bisulfite from byproduct Na2SO4
  • Industrial method for continuously producing sodium bisulfite from byproduct Na2SO4

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] The main train of thought of the process route of the present invention is: utilize sulfur dioxide and calcium hydroxide to react to generate calcium bisulfite solution, make the calcium ion in calcium bisulfite react with sodium sulfate to generate precipitate calcium sulfate, filter out the precipitate, and the filtrate is It is sodium bisulfite solution, and the filter residue is calcium sulfate or calcium sulfite solid.

[0033] The reaction mechanism of operational route of the present invention is as follows:

[0034] SO 2 It is a colorless and irritating acid gas, easily soluble in ...

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Abstract

The invention discloses an industrial method for continuously producing sodium bisulfite from byproduct sodium sulfate. The method comprises the steps as follows: step one, byproduct Na2SO4 and Ca(OH)2 or CaO are put in an alkali dissolving tank to produce an ashing suspension through stirring; step two, the ashing suspension and SO2 gas react in a three-stage absorption reaction system to producea mixed suspension of calcium sulfate and sodium bisulfite; step 3, the mixed suspension obtained in the step two is subjected to solid-liquid separation, and an obtained solution is a sodium bissulfite solution. The ratio of various raw materials is dynamically and slightly adjusted in a three-stage absorption reaction form, so that the synthesis process is accurately controlled, and industrialization of continuous production of sodium bisulfite from byproduct Na2SO4 is realized.

Description

technical field [0001] The invention relates to an industrialized method for continuously producing sodium bisulfite by-product sodium sulfate. Background technique [0002] Sodium sulfate (Na 2 SO 4 ) is a salt formed by the combination of sulfate and sodium ions. Sodium sulfate is soluble in water and its aqueous solution is neutral, soluble in glycerin but not in ethanol. Sodium sulfate containing crystal water is generally sodium sulfate decahydrate, also known as Glauber's salt, which is chemically stable and insoluble in strong acids. At present, there are almost no enterprises that specialize in the neutralization reaction of sulfuric acid and alkali to produce sodium sulfate. Generally, it is extracted from wastewater containing sodium sulfate, and high-purity sodium sulfate is obtained through repeated recrystallization. With the development of the economy and people's concern for the environment The requirements are getting higher and higher. The waste sulfuric ...

Claims

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Application Information

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IPC IPC(8): C01D5/14C01F11/46
CPCC01D5/145C01F11/46
Inventor 颜志斌陈杨欧阳兆辉周建锋简理朱传胜夏勇陈进
Owner 武汉青江化工黄冈有限公司
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