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Method for reducing residue output in sodium hydrosulfite production process

A production process, sodium hydrosulfite technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., can solve problems such as excessive residues and ecological environment damage, speed up the recovery rate and reduce raw materials Consumption and energy saving effects

Pending Publication Date: 2021-10-22
HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sodium formate method is usually used to treat the rectification residue of sodium hydrosulfite. However, the amount of residue produced after recovery by this method is relatively large, and under the principle of environmental protection, the damage to the ecological environment is relatively serious.

Method used

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  • Method for reducing residue output in sodium hydrosulfite production process

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a method for reducing the amount of residue generated in the production process of hydrosulfite, comprising the following steps:

[0028] S1. Put the distilled hydrosulfite residue into the first-effect evaporator and heat it with steam. After evaporation, put it into the second-effect evaporator for concentration to obtain the concentrate and condensate; the concentrate is 400-500g / L, and the condensate is condensed through waste water into the waste water tank.

[0029] S2. After the concentrated solution is sent to the solidified B kettle, it is heated and concentrated with steam. The concentrated solution in the solidified B kettle is concentrated to the standard and then discharged to the centrifuge head tank, and then sent to a centrifuge for centrifugation to obtain sodium formate and centrifuged mother liquor;

[0030] The gas generated by the two-effect evaporator and the curing B kettle passes through the circulating water condenser, the...

Embodiment 2

[0034] The invention provides a method for reducing the amount of residue generated in the production process of hydrosulfite, comprising the following steps:

[0035] S1. Put the distilled hydrosulfite residue into the first-effect evaporator and heat it with steam. After evaporation, put it into the second-effect evaporator for concentration to obtain the concentrate and condensate; the concentrate is 400-500g / L, and the condensate is condensed through waste water into the waste water tank.

[0036] S2. After the concentrated solution is sent to the solidified B kettle, it is heated and concentrated with steam. The concentrated solution in the solidified B kettle is concentrated to the standard and then discharged to the centrifuge head tank, and then sent to a centrifuge for centrifugation to obtain sodium formate and centrifuged mother liquor;

[0037] The gas generated by the two-effect evaporator and the curing B kettle passes through the circulating water condenser, the...

Embodiment 3

[0042] The invention provides a method for reducing the amount of residue generated in the production process of hydrosulfite, comprising the following steps:

[0043] S1. Put the distilled hydrosulfite residue into the first-effect evaporator and heat it with steam. After evaporation, put it into the second-effect evaporator for concentration to obtain the concentrate and condensate; the concentrate is 400-500g / L, and the condensate is condensed through waste water into the waste water tank.

[0044] S2. After the concentrated solution is sent to the solidified B kettle, it is heated and concentrated with steam. The concentrated solution in the solidified B kettle is concentrated to the standard and then discharged to the centrifuge head tank, and then sent to a centrifuge for centrifugation to obtain sodium formate and centrifuged mother liquor;

[0045] The gas generated by the two-effect evaporator and the curing B kettle passes through the circulating water condenser, the...

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Abstract

The invention discloses a method for reducing residue output in a sodium hydrosulfite production process, the method comprises the following steps: S1, pumping sodium hydrosulfite rectification residual liquid into a first-effect evaporator, heating with steam, evaporating, and concentrating in a second-effect evaporator to obtain concentrated liquid and condensate; s2, feeding the concentrated solution into a curing kettle B, heating and concentrating with steam, discharging to a centrifugal head tank, feeding into a centrifugal machine, and centrifuging to obtain sodium formate and centrifugal mother liquor; s3, pumping the centrifugal mother liquor into a curing kettle A, continuously heating and concentrating with steam, adding methanol for extraction after concentration, removing supernatant liquid, connecting other materials with a metal hose, putting the other materials into a dryer, carrying out pressure filtration with nitrogen to obtain pressure filtration mother liquor, and treating the pressure filtration mother liquor to obtain sodium formate; s4, after the four-in-one mother liquor tank reaches a second preset liquid level, pumping liquid in the four-in-one mother liquor tank into an evaporation kettle, gasifying methanol, condensing and recycling so that a kettle bottom concentrated solution is sodium hydrosulfite residues. The method has the beneficial effect of reducing the generation amount of residues.

Description

technical field [0001] The invention relates to the technical field of chemical production. More specifically, the present invention relates to a method for reducing the amount of residue generated during the production of sodium bicarbonate. Background technique [0002] Pyrolyte is one of the main raw materials for the production of hydrosulfite, and the quality of pyrolyte directly affects the synthetic reaction of hydrosulfite. At present, the quality of pyrosulfite has low main content and high impurity sodium sulfate content. Therefore, controlling the synthesis reaction process is a key link in production. On the premise of improving the quality of sodium pyrosulfite and recovering sodium formate, the reaction temperature and reaction pH indicators to suppress side reactions and reduce the generation of impurities. At the same time, it is also necessary to provide a method for recovering the rectification raffinate produced in the production process of sodium hydros...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C51/48C07C53/06C07C29/80C07C31/04
CPCC07C51/42C07C51/48C07C29/80C07C53/06C07C31/04
Inventor 刘承海郭锐朱月王猛邹爽李晓奎高劲松谢万飞张元堂
Owner HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
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