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Treatment method of naphthenic acid alkaline residue waste liquid

A treatment method and acid treatment technology, which is applied in the field of naphthenic acid-alkali residue waste treatment, can solve the impact of sewage treatment plants and other problems, and achieve the effects of reducing COD, low overall equipment investment and operating costs, and mild operating conditions

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

AI Technical Summary

Problems solved by technology

However, this method of processing alkali slag will eventually form high-salt alkali slag and neutralized water, which will still have an impact on the sewage treatment plant

Method used

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  • Treatment method of naphthenic acid alkaline residue waste liquid

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Embodiment 1

[0033] A refinery naphthenic acid and alkali residue waste liquid, in which COD is 2.89×10 5 mg / L, the sulfide is 1013mg / L. Use the method of the present invention figure 1 process for processing. The flue gas is S-zorb regenerator flue gas, where SO 2 The content is 1.2v%~5.4v%, O 2 The content is 0.1v%~0.5v%, CO 2 The content is 1.6 v% to 2.3v%. After deoxidation by catalytic oxidation method, the oxygen content is reduced to below 0.1v%.

[0034] Use the deoxidized flue gas to acidify the alkali slag waste liquid until the pH of the alkali slag waste liquid drops to 2-3, then stop the acidification. The acidic waste liquid after the acidification treatment is settled, the upper oil phase is separated, and the naphthenic acid is recovered. The alkali slag waste liquid is acidified to remove more than 99.7wt% of sulfides, and the COD removal rate reaches 98wt%. The acidified tail gas generated during the acidizing process is discharged into the refinery acid gas pipeli...

Embodiment 2

[0038] A refinery naphthenic acid and alkali residue waste liquid, in which COD is 2.03×10 5 mg / L, the sulfide is 688mg / L. Use the method of the present invention figure 1 process for processing. The flue gas is FCC catalyst regeneration flue gas, in which SO 2 The content is 0.1v%~0.4v%, O 2 The content is 1.5 v%~3.0v%, CO 2 The content is 16 v%~19v%, and after deoxidation by catalytic oxidation method, the oxygen content is reduced to below 0.2v%.

[0039] Use the deoxidized flue gas to acidify the alkali slag waste liquid until the pH of the alkali slag waste liquid drops to 3-4, then stop the acidification. The acidic waste liquid after the acidification treatment is settled, the upper oil phase is separated, and the naphthenic acid is recovered. The alkali slag waste liquid is acidified to remove more than 99.7wt% of sulfides, and the COD removal rate reaches 96.5wt%. The acidified tail gas generated during the acidizing process is discharged into the refinery acid...

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Abstract

The invention relates to a treatment method of alkaline residue waste liquid from oil refining. The treatment method comprises the steps of: (1) deoxidizing flue gas containing SO2 and CO2; (2) acidizing the alkaline residue waste liquid with the deoxidized flue gas and stopping acidification when the pH value of the waste liquid reaches 2-7; (3) sending organic sulfides and acidified H2S tail gas discharged in the acidification into an acid gas pipe network in a refinery plant; (4) subsiding the acidic waste liquid after the acidification, and recovering an oil phase; and (5) adding lime into the waste liquid after oil recovery for causticization regeneration, separating out precipitates and reusing regenerated alkali lye in an alkali refining process of oil products. The method of the invention uses deoxidized flue gas containing SO2 and CO2 to acidize the alkaline residue waste liquid, so as to treat wastes with processes of wastes against one another, and can effectively remove sulfides in the alkaline residue waste, recover naphthenic acid and neutral oil and reduce COD of the alkaline residue waste liquid. After causticization regeneration, the regenerated alkali lye can be reused in the oil alkali refining process of oil products, so as to realize reclamation of the highly dangerous alkaline residue waste liquid hard for treatment and reduce the environment pollution.

Description

technical field [0001] The invention relates to a treatment method for alkali slag waste liquid, in particular to a treatment method for naphthenic acid-alkali slag waste liquid produced in the first, second and third line diesel alkali refining processes. Background technique [0002] During the alkali refining process of oil products in refineries, alkaline waste liquid containing high concentrations of pollutants will be produced, and the emissions of COD, sulfides and phenols account for more than 40wt% to 50wt% of the emissions of such pollutants in refineries. It is mainly composed of atmospheric diesel soda residue, catalytic diesel soda residue, catalytic gasoline soda residue, liquid hydrocarbon soda residue, etc. If the alkali residue waste liquid is discharged directly, it will seriously pollute the environment; if it is sent to the sewage treatment plant, it will seriously affect the normal operation of the sewage treatment plant, making it difficult to discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01D53/60B01D53/78C02F103/36
Inventor 赵磊刘忠生王新王有华
Owner CHINA PETROLEUM & CHEM CORP