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Method for treating residual liquid after mother liquor distillation methanol recovery during production of sodium sulphoxylate by sodium formate process

A technology for sodium hydrosulfite and methanol recovery, applied in thiosulfate/dithionite/polythionite, combustion method, separation method, etc., and can solve problems such as large quantity, high COD concentration, and environmental pollution

Inactive Publication Date: 2007-12-05
GUANGDONG ZHONGCHENG CHEM INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high COD concentration, large quantity and large amount of organic sulfide in the rectification raffinate, if it is not treated and discharged directly, it will cause serious environmental pollution
[0003] The rectification raffinate contains a large amount of inorganic and organic sulfides capable of killing bacteria, so it is difficult to treat with biochemical treatment
[0004] Although the method of chemical oxidation with oxidant is technically feasible, due to the long process and complex intermediate products, it is difficult to meet the COD standard, and the treatment cost is high
[0005] Incineration is an economically feasible method, but common waste incineration devices will produce high concentrations of SO during the incineration process 2 And foul-smelling flue gas, and will produce strong alkaline waste, secondary pollution is large, so it is extremely difficult to dispose of in general waste incinerators

Method used

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  • Method for treating residual liquid after mother liquor distillation methanol recovery during production of sodium sulphoxylate by sodium formate process
  • Method for treating residual liquid after mother liquor distillation methanol recovery during production of sodium sulphoxylate by sodium formate process

Examples

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no. 1 example

[0027] Referring to Fig. 1, the first embodiment of the present invention is realized according to the following steps:

[0028] Step 1, material concentration: the rectification raffinate 111 is obtained after the rectification of the mother liquor produced in the process of producing sodium dithionite by the sodium formate method to reclaim methanol, and the main component content of the rectification raffinate 111 is sodium formate 110g / l, sodium sulfite 8.9g / l l. Sodium thiosulfate 4.5g / l, methanol 6.5g / l, organic sulfide and other substances 61g / l, chemical oxygen demand (COD) 238000mg / l, take 10m 3 The above-mentioned rectification raffinate 111 is concentrated until a large amount of crystals appear, and the concentrated residue 112 in the form of a slurry is obtained after being released and cooled, with a weight of 2020 kg;

[0029] Step 2, incineration feeding stage: use the second-stage converter 121 to incinerate, use a heavy oil burner to first raise the temperatu...

no. 2 example

[0036] Referring to Fig. 2, the second embodiment of the present invention is realized according to the following steps:

[0037] Step 1, material concentration: the rectification raffinate 211 is obtained after the rectification of the mother liquor produced in the process of producing sodium dithionite by the sodium formate method to reclaim methanol, and the main component content of the rectification raffinate 211 is sodium formate 120g / l, sodium sulfite 7.8g / l l. Sodium thiosulfate 5.6g / l, methanol 5.8g / l, organic sulfide and other substances 63g / l, chemical oxygen demand (COD) 252000mg / l, take 10m 3 The above-mentioned rectification raffinate 211 is concentrated until a large amount of crystals appear to become a concentrated raffinate 213, and methanol is added to the concentrated raffinate 213 to filter out the crystal 214 with sodium formate and sodium sulfite as the main components to obtain a methanol leaching filtrate 215. The weight of the crystal 214 is 1120kg. Its...

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Abstract

The present invention is process of treating mother liquid residue from sodium formate method to produce sodium hyosulfate and after being rectified to recover methanol. The process includes the following steps: 1. concentrating to obtain concentrated residue with or without sodium formate recovery; 2. incinerating the concentrated residue in a converter or one combined furnace to obtain incinerated clinker; 3. discharging high temperature clinker; 4. dissolving the clinker to form water solution; 5. absorbing SO2 from the incinerating fume with the water solution; and 6. adding sulfur to the absorbed solution to prepare sodium thiosulfate. The process can eliminate pollutant while producing sodium thiosulfate as chemical material.

Description

Technical field [0001] The invention relates to a method for treating the raffinate after methanol rectification and recovery of methanol in the process of producing sodium dithionite by sodium formate method, in particular to a method for treating methanol rectification raffinate or its concentrate produced in the production process by high-temperature incineration, and The method utilizes the incineration residue solution to absorb a large amount of sulfur dioxide produced in the incineration process, effectively treats the incineration residue and flue gas, and recovers sodium thiosulfate. Background technique [0002] Sodium dithionite (Sodium dithionite or Sodium hydrosulfite), commonly known as sodium hydrosulfite, is a commonly used reducing agent in industry and is mainly used for textile printing and dyeing and paper bleaching. In the production of sodium dithionite, sodium formate, sodium pyrosulfite and sulfur dioxide are used as raw materials, methanol is used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04F23G7/00B01D53/50C01B17/64C02F1/58
Inventor 钟存仁庞江洪
Owner GUANGDONG ZHONGCHENG CHEM INC LTD
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