Regeneration method for sulphureous alkali residues

A technology of alkali residue and lye, applied in the preparation/purification of sulfur, the removal of alkali metal hydroxide, solid waste, etc. Dealing with device adverse effects, etc.

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will produce alkaline waste liquid during the stripping process of alkali slag
[0016] To sum up, the existing alkali slag treatment methods basically do not recover the sulfur and sodium resources in the alkali slag, and the wastewater produced by neutralization generally needs to be mixed with other sewage and diluted together to be treated in the activated sludge biological treatment device. Due to the COD concentration of the wastewater The higher content of salt and salt has a greater adverse effect on the activated sludge biological sewage treatment plant

Method used

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  • Regeneration method for sulphureous alkali residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A certain alkali washing liquid hydrocarbon alkali residue wastewater, in which COD is 1.27×10 5 mg / L, the sulfide is 1.08×10 4 mg / L, volatile phenol 1.99×10 4 mg / L. Use the inventive method to process, introduce the SO contained in the Claus plant 2 Gas, that is, the raw material gas in the Claus unit, is introduced at the same time as the exhaust gas from the SCOT unit of the Claus unit’s tail gas treatment unit to acidify the alkali slag wastewater. By adjusting the ratio of the gas introduced, the volume content of hydrogen sulfide in the exhaust gas to 50%, the acidification is carried out until the pH of the alkali slag wastewater drops to 3, and the SO 2 Gas, continue to pass the exhaust gas of the SCOT device for 10 minutes.

[0043] After the acidification, the oil phase (mainly phenol) separated from the water layer was recovered by standing still. After the above acidification treatment, more than 99% of sulfides are removed, more than 80% of phenols are...

Embodiment 2

[0046] A liquid hydrocarbon and gasoline mixed alkali residue wastewater, in which COD is 1.25×10 5 mg / L, sulfide is 1.78×10 4 mg / L, volatile phenol 7.17×10 4 mg / L. Use the inventive method to process, introduce the SO contained in the Claus plant 2 Gas, that is, the raw material gas in the Claus unit, is introduced at the same time as the exhaust gas from the SCOT unit of the Claus unit’s tail gas treatment unit to acidify the alkali slag wastewater. By adjusting the ratio of the gas introduced, the volume content of hydrogen sulfide in the exhaust gas to 65%, the acidification is carried out until the pH of the alkali slag wastewater drops to 4, and the SO 2 Gas, continue to pass the exhaust gas of the SCOT device for 20 minutes.

[0047] After the acidification, the oil phase (mainly phenol) separated from the water layer was recovered by standing still. After the above acidification treatment, more than 98% of sulfides are removed, more than 80% of phenols are removed...

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Abstract

The invention relates to a regeneration method for sulphureous alkali residues comprises three parts, namely, SO2 acidification of the alkali residues, extraction and recycling of petroleum acid, and causticization and regeneration, wherein SO2 used in the step of SO2 acidification is SO2-containing gas from a Klaus sulfur production device, meanwhile tail gas of the Klaus sulfur production device is introduced as carrier gas, and acidification is stopped when the pH of acidulous water generated by acidification reaches 2-4. Three phases, including gas, oil and water, are generated in the acidification process, wherein the gas enters the Klaus sulfur production device so as to separate and recycle acid oil, and the water phase is subjected to solvent extraction so as to recycle petroleum acid, and then is causticized with Ca(OH)2 and precipitated to separate calcium sulfite to generate a sodium hydroxide solution which is recycled as alkali liquor for alkali washing of oil. The method provided by the invention has the advantages that the investment is low, the operation condition is mild, sulfide, petroleum acid and sodium ions can be recycled, no odorous gas is discharged, no high-concentration or high-salinity waste liquor flows into a sewage disposal station, and certain economic benefits are achieved.

Description

technical field [0001] The invention provides a method for regenerating sulfur-containing alkali residues. The alkali residues mainly include: refinery diesel alkali residues, gasoline alkali residues, liquid hydrocarbon alkali residues, ethylene alkali residues, and other alkali residues containing sodium sulfide. In particular, the acidification recovery method is used to regenerate the sulfur-containing alkali slag. Background technique [0002] In the process of alkali washing and refining of oil products, ethylene gas purification, coal gas purification, and natural gas purification in refineries, sulfur-containing alkali residues are produced. These alkali residues generally contain sodium sulfide. The concentration of sodium sulfide varies with the source of alkali residues. Liquid hydrocarbons in refineries The concentration of sodium sulfide in soda slag and gasoline slag is relatively high, and that in diesel slag is low; the concentration of sodium sulfide in ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01B17/04C01D1/04
Inventor 刘忠生赵磊刘志禹
Owner CHINA PETROLEUM & CHEM CORP
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