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Regeneration process of sulfur-containing waste alkali liquor

A technology for sulfur waste lye and waste lye, which is applied in the field of regeneration technology of sulfur-containing waste lye, can solve the problems of secondary environmental pollution, poor economic benefits, huge investment in processing equipment, etc., and achieves large specific surface area and adsorption capacity. Strong, high processing efficiency

Active Publication Date: 2021-02-12
锦州泰丰精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HOUD's spent alkali fiber membrane extraction-oxidation regeneration process, the effect of using fiber membrane to regenerate waste alkali is better, but the investment in treatment equipment is huge, the maintenance cost is also high, and the economic benefit is poor; the catalytic alkali extraction-oxidation regeneration treatment process is one-time The investment and equipment maintenance costs are slightly lower. It is the MEROX waste alkali desulfurization alkali regeneration process developed by the UOP company in 1958. It uses lye to extract mercaptans, convert them into sodium mercaptides, and catalyze the oxidation of sodium mercaptans. It is disulfide, polysulfide is recovered by three-phase separation, sodium sulfide is oxidized into sodium thiosulfate and sodium sulfite, and the tail gas is discharged through incineration. This method needs to be incinerated. The tail gas produced by combustion contains a large amount of SO2 and H2S harmful gases. Easy to cause secondary pollution to the environment

Method used

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  • Regeneration process of sulfur-containing waste alkali liquor
  • Regeneration process of sulfur-containing waste alkali liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) The composition of waste lye produced by cracking method: sodium hydroxide 4.4%, sodium carbonate 2.6%, sodium sulfide 2.7%, COD12450mg / L, pH12.2, organic sulfur 0.03mg / L.

[0069] (2) As shown in the figure, the regeneration system of sulfur-containing waste lye is adopted, the system has an acidification tank 1 and an acidification kettle 2, and the acidification kettle 2 is provided with a waste acid inlet 201, an oxidant inlet 202, and a flocculant inlet 203, waste lye inlet 204, acidification waste lye outlet 205 and waste gas outlet 206, the acidification tank 1 is connected with the waste acid inlet 201 of the acidification kettle 2 through a pipeline, and the acidification waste lye water outlet of the acidification kettle 2 is A sedimentation concentration tank 3, a centrifugal pump I4, and a filter press 5 are successively connected through pipelines, and the liquid outlet of the filter press 5 is connected with a decolorization kettle 7 through a pipeline,...

Embodiment 2

[0072] (1) The composition of the waste lye produced in the production of hydrogenated gasoline: 5.2% sodium hydroxide, 2.3% sodium carbonate, 2.3% sodium sulfide, COD14365mg / L, pH12.4;

[0073] (2) the regeneration system of the sulfur-containing waste caustic soda that adopts is the same as embodiment 1;

[0074] (3) Get 1000g of waste lye produced in the production of hydrogenated gasoline and put it into the acidification kettle 2, adjust the pH to 12 with concentrated sulfuric acid, add Na 2 S 2 o 8 35g, 0.5g of octanol, stir to dissolve, add 3.0g of cationic polyacrylamide solution with a mass concentration of 0.1%, and stir slowly for 30min; during the reaction process, waste gas containing hydrogen sulfide will be generated, which will enter the middle storage tank 9 through the waste gas outlet 206 , the exhaust gas containing hydrogen sulfide in the middle storage tank 9 enters the spray tower 10 from the bottom of the spray tower 10, and is sprayed with NaOH solu...

Embodiment 3

[0076] (1) Composition of sulfur-containing waste lye: 6.1% sodium hydroxide, 2.8% sodium carbonate, 2.6% sodium sulfide, COD 15281mg / L, organic sulfur 0.02mg / L, pH12.6;

[0077] (2) the regeneration system of the sulfur-containing waste caustic soda that adopts is the same as embodiment 1;

[0078] (3) Get 1000g of waste lye produced in the production of hydrogenated gasoline and pour it into the acidification kettle 2, adjust the pH to 11 with concentrated sulfuric acid, add Na 2 S 2 o 8 10g, 0.1g of octanol, stir to dissolve, add 0.1g of cationic polyacrylamide solution with a mass concentration of 0.1%, and slowly stir for 30min; during the reaction process, waste gas containing hydrogen sulfide will be generated, which will enter the middle storage tank 9 through the waste gas outlet 206 , the exhaust gas containing hydrogen sulfide in the middle storage tank 9 enters the spray tower 10 from the bottom of the spray tower 10, and is sprayed with NaOH solution with a con...

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Abstract

The invention relates to a regeneration process of sulfur-containing waste alkali liquor, which comprises the following steps: pumping the sulfur-containing waste alkali liquor into an acidification kettle of a regeneration system of the sulfur-containing waste alkali liquor, regulating the pH value to be less than or equal to 12 by using concentrated sulfuric acid, adding Na2S2O8 and octanol, stirring to dissolve, adding cationic polyacrylamide, and stirring at room temperature; after the reaction is finished, feeding into a filter press for filter pressing treatment, feeding filtrate into adecolorizing kettle, adding solid caustic soda, stirring for dissolving, then adding hexadecyl trimethyl ammonium chloride, and stirring to obtain regenerated alkali liquor; the process has the advantages that the regeneration of the sulfur-containing waste alkali liquor is realized, the alkalinity and chroma of the regenerated alkali liquor meet the regeneration and utilization requirements, theprocess is energy-saving and environment-friendly, besides a small amount of waste residues, the industrial wastewater is zero-discharged, and tail gas needing to be incinerated is avoided.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, and in particular relates to a regeneration process of sulfur-containing waste lye. Background technique [0002] In the process of producing ethylene, diesel, gasoline, etc. by pyrolysis, lye (sodium hydroxide solution) is usually used to wash the raw material gas, cracked gas and product steam, so as to remove acid gases such as carbon dioxide and hydrogen sulfide. Impurities are removed to ensure that products such as raw gas and finished oil and gas meet the quality requirements and ensure the safe and stable operation of the device. During the caustic gas cleaning process, due to the continuous reaction consumption of caustic soda and acid gases such as carbon dioxide and hydrogen sulfide and the dilution of washing water, the effective alkali concentration in the lye is continuously decreasing. Therefore, in order to ensure the cleaning effect, continuous cleaning is requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01D1/28C01D1/32C01D1/36C01D7/22C01D7/26C01D7/30
CPCC02F9/00C01D1/28C01D1/36C01D1/32C01D7/22C01D7/26C01D7/30C02F2001/007C02F1/58C02F1/5236
Inventor 吴哲吴宪龙刘海峰刘旭迟海峰
Owner 锦州泰丰精细化工有限公司
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