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Process and device for producing sodium pyrosulfite by flue gas desulfurization method

A technology for sodium metabisulfite and a production device, applied in the field of preparation of sodium metabisulfite, can solve the problems of affecting the purity of sodium metabisulfite, high solubility and difficult to remove, and achieve the effects of improving yield, low cost, and inhibiting oxidation

Inactive Publication Date: 2021-10-08
王杰
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Problems solved by technology

[0006] However, because the sulfite ion is easily oxidized, new impurities are introduced, and the industrial low-grade Na 2 SO 3 Higher content of Na in 2 SO 4 , high solubility is difficult to remove, affecting the purity of sodium metabisulfite, giving Na 2 SO 3 As a desulfurization absorbent to produce Na 2 S 2 o 5 brings a new bottleneck

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  • Process and device for producing sodium pyrosulfite by flue gas desulfurization method

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Embodiment Construction

[0022] In order to make the object, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0023] The invention provides a process for producing sodium pyrosulfate from flue gas desulfurization, the flow chart of which is as follows figure 1 shown.

[0024] Described processing step is as follows:

[0025] 1. Preparation of absorption solution: Na with a content of more than 85wt% 2 SO 3 The product is mixed with the mother liquor produced in the production process in a certain proportion to form NaHSO 3 、Na 2 SO 3 and Na 2 S 2 o 5 The mixed solution, control the Baume degree to be 54-56 degrees, and prepare it for later use;

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Abstract

The invention discloses a process and device for producing sodium pyrosulfite through a flue gas desulfurization method. According to the process, industrial sodium sulfite with the content of 85% or above is adopted to absorb flue gas, NaHSO3 is generated when the final pH value of absorption liquid is controlled to be 3.9-4.1, and sodium pyrosulfite is obtained through crystallization. The absorption liquid is a Na2SO3 solution, and crystallization mother liquor is mixed with the absorption liquid. According to the process, the precipitation of sulfate is effectively reduced by adopting a simple and feasible method, the output of sodium pyrosulfite is improved, and the industrialized preparation of sodium pyrosulfite by adopting a flue gas desulfurization method is powerfully promoted.

Description

technical field [0001] The invention relates to the technical field of preparation of sodium pyrosulfite, in particular to a process and a device for producing pyrosulfurous acid by a flue gas desulfurization method. Background technique [0002] Existing wet preparation of Na 2 S 2 o 5 The production technology adopts more than 98% Na 2 CO 3 with SO 2 The reaction produces Na 2 S 2 o 5 product. This production process produces large amounts of CO 2 Gas, and in the process of putting in soda ash, a large amount of heat will be released, which will increase the temperature of the absorption liquid (65°C), and a violent reaction will occur, producing a large number of bubbles. Due to the increase in temperature, some SO 3 2- Decompose and release SO 2 gas, thus producing CO 2 and SO 2 The mixed gas will cause great harm to the human body. [0003] In addition, the large amount of heat released during pure alkalization will cause the temperature of the lye to rea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14
CPCC01D5/145
Inventor 王杰
Owner 王杰
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