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Treatment method of oil refining alkali slag waste liquid

A technology of refining alkali residue and alkali residue waste liquid, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the adverse effects of sewage treatment devices, failure to recover sulfur resources and Sodium resources, high COD concentration and salt content, etc., to achieve good environmental and economic benefits, strengthen the gas-liquid mass transfer process of acidification reaction, and reduce the effect of COD

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] To sum up, the existing alkali slag waste liquid treatment methods basically do not recover the sulfur and sodium resources in the alkali slag waste liquid, and the waste water produced by neutralization generally needs to be mixed with other sewage to be diluted and sent to the sewage treatment plant. Due to the COD concentration of the waste water The high content of salt and salt will have a great adverse effect on the sewage treatment plant

Method used

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  • Treatment method of oil refining alkali slag waste liquid

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Embodiment 1

[0042] A company's catalytic gasoline alkali residue and liquid hydrocarbon alkali residue mixed alkali residue waste liquid, of which COD is 3.21×10 5 mg / L, Na 2 S (measured in S) is 1.18×10 4 mg / L, mercaptan sulfur (calculated as S) is 1.71×10 4 mg / L, the total sulfide (calculated as S) is 3.12×10 4 mg / L, volatile phenol is 8.07×10 4 mg / L. Using the present invention figure 1 According to the method shown, first, acidify the alkali slag waste liquid by using sulfuric acid with a volume concentration of 75%, and introduce nitrogen gas as a carrier gas until the pH of the alkali slag waste liquid drops to 2.0.

[0043] During the acidification process, before the pH drops to 10, the acidified tail gas containing organic sulfides generated by acidification enters the condensing device, the condensation temperature is controlled at 5 ° C, and the pressure is 0.5 MPa to recover organic sulfides, and the non-condensable gas discharged from the condensing device The medium is...

Embodiment 2

[0049] A company's catalytic gasoline alkali residue and liquid hydrocarbon alkali residue mixed alkali residue waste liquid, of which COD is 2.83×10 5 mg / L, Na 2 S (measured in S) is 1.33×10 4 mg / L, mercaptan sulfur (calculated as S) is 2.03×10 4 mg / L, the total sulfide (calculated as S) is 3.69×10 4 mg / L, volatile phenol is 5.26×10 4 mg / L. Using the present invention figure 1 According to the method shown, first, acidify the alkali slag waste liquid with sulfuric acid with a volume concentration of 65%, and pass nitrogen gas as a carrier gas until the pH of the alkali slag waste liquid drops to 4.0.

[0050] During the acidification process, before the pH drops to 9.5, the acidified tail gas containing organic sulfides generated by acidification enters the condensing device, and the condensation temperature is controlled at -5°C, 0.2MPa to recover organic sulfides, and the non-condensable gas discharged from the condensing device It is mainly nitrogen, which is returne...

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Abstract

The invention provides an oil refining alkali dreg waste liquid processing method including the following steps: (1) sulfuric acid is used for acidification of alkali dreg waste liquid, and nitrogen is introduced; before pH is decreased to 11-9.5, acidified tail gas produced by acidification is discharged into a condensing device, gas discharged by the condensing device is returned to an acidification device to be used as a carrier gas; acidification is continued to be performed until the pH value is dropped to 7-8, acidified tail gas produced by the acidification section is discharged into a sulfur recovery plant for the production of sulfur; acidified tail gas produced after the acidification section is totally returned to the acidification device to be used as the carrier gas; (2) when the alkali dreg waste liquid pH value is dropped to 2-7, acidification is stopped, and oil phase is separated; (3) the waste water with the oil phase recovered is extracted; (4) after extraction, acidic liquid is processed with sodium hydroxide, the sodium hydroxide is added according to the final concentration of alkali of 20wt%-50wt%, and precipitate is isolated to obtain an alkali liquor capable of being reused. The oil refining alkali dreg waste water processing method can effectively recover sulfur resources, sodium resources and phenols in alkali dreg waste water, reduces COD of the waste liquid without production of high salt content and high COD waste liquid, and avoids impact to the sewage treatment field; meanwhile recovered lye can be reused for oil product alkali washing refining and extractant regeneration, and the zero discharge of the alkali dreg waste water can be realized.

Description

technical field [0001] The invention relates to a treatment method for oil refining alkali slag waste liquid, which is suitable for the high sulfur content and high COD alkali slag waste liquid produced in the alkali washing and refining process of catalytic gasoline and diesel oil, or catalytic gasoline alkali slag, catalytic diesel alkali slag, liquid hydrocarbons Mixed alkali slag waste liquid such as alkali slag. Background technique [0002] In the process of alkaline cleaning and refining of oil products in refineries, alkaline waste liquid containing high concentrations of pollutants will be produced, and the emissions of COD, sulfide and phenol account for more than 40% to 50% of the emissions of such pollutants in refineries , mainly composed of atmospheric diesel soda residue, catalytic gasoline soda residue, catalytic diesel soda residue, liquid hydrocarbon soda residue and so on. These alkali slag wastes will seriously pollute the environment; if sent to the sew...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G19/08C02F9/04
Inventor 赵磊刘志禹刘忠生王新王有华
Owner CHINA PETROLEUM & CHEM CORP
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