A comprehensive treatment method for sulfur-containing alkali slag

A comprehensive treatment and alkali residue technology, applied in the direction of solid waste removal, etc., can solve the problems of no recovery of sulfur resources, adverse effects of activated sludge biological sewage treatment equipment, high COD concentration and salt content, and shorten the reaction time and equipment. Small size and COD reduction effect

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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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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  • A comprehensive treatment method for sulfur-containing alkali slag

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Effect test

Embodiment 1

[0043] A certain alkali washing liquid hydrocarbon alkali residue wastewater, in which COD is 3.21×10 5 mg / L, sulfide is 1.99×10 4 mg / L, volatile phenol 9.07×10 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.

[0044] 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 rem...

Embodiment 2

[0048] A certain liquid hydrocarbon and gasoline mixed alkali residue wastewater, in which COD is 2.35×10 5 mg / L, sulfide is 3.68×10 4 mg / L, volatile phenol 5.89×10 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.

[0049] 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...

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Abstract

The invention relates to a sulfur-containing alkaline residue comprehensive control method including three parts of alkaline residue SO2 acidification, electrochemical oxidation and alkali precipitation regeneration, SO2 used in the SO2 acidification is from SO2-containing gas from Claus sulfur preparation unit, meanwhile tail gas from the Claus sulfur preparation unit is introduced to be used as a carrier gas, when the pH of acid water generated by the acidification reaches 2-6, the acidification is stopped, the amount of the introduced carrier gas is controlled to make volume concentration of hydrogen sulfide in the gas mixture generated by the acidification higher than 15%. In the acidification process, gas, oil and water three phases are produced, the gas enters the Claus sulfur preparation unit, the acid oil is separated and recovered, the acidic water phase enters an electrochemical oxidation reactor for NaOH analysis, and generated regenerated lye is returned back for oil alkali washing refining process. The sulfur-containing alkaline residue comprehensive control method has the advantages of small investment, mild operation conditions, recovery of sulfide, petroleum acid and sodium ions, no emissions of malodorous gases, no high COD and high salt wastewater needing to enter the sewage treatment field, and certain economic benefits.

Description

technical field [0001] The invention relates to a comprehensive treatment method for sulfur-containing alkali residues. The alkali residues mainly include: diesel oil 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 treat 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 ethylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 刘忠生赵磊刘志禹王新王有华
Owner CHINA PETROLEUM & CHEM CORP
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