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Acidification treatment method of oil refining alkali residue waste liquid

A kind of technology of acidification treatment and oil refining alkali residue

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of volatile organic compounds and malodorous sulfides in the alkali slag will be released during the evaporation process, resulting in a high concentration of pollutants in the gas phase condensate, and a large amount of energy consumption for evaporation and incineration
[0011] The acidification method is used to treat the alkali slag waste liquid, and some of the malodorous gases containing organic sulfides and hydrogen sulfide are directly discharged, which will seriously pollute the environment; some require special deodorization equipment, which increases equipment investment and operating costs, and Organic sulfide and hydrogen sulfide have not been utilized as resources

Method used

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  • Acidification treatment method of oil refining alkali residue waste liquid

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Embodiment 1

[0035] 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, firstly, sulfuric acid with a volume concentration of 75% is used to acidify the alkali slag waste liquid, and nitrogen gas is introduced as a carrier gas.

[0036] Before the pH drops to 10, the acidified tail gas containing organic sulfides produced by acidification enters the condensing device, and the condensation temperature is controlled at 5°C and the pressure is 0.5 MPa to recover organic sulfides. The non-condensable gas discharged from the condensing device is mainly nitrogen. Main, return to acidifying unit as carrier gas. Organic sulfides such as methyl ...

Embodiment 2

[0040] 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 Process as shown, first using SO-containing 2 The gas is used to acidify the alkali slag waste liquid, and nitrogen is used as the diluted carrier gas.

[0041] Before the pH drops to 9.5, the acidified tail gas containing organic sulfides produced by acidification enters the condensing device, and the condensation temperature is controlled at -5°C and the pressure is 0.2MPa to recover organic sulfides. The non-condensable gas discharged from the condensing device is mainly nitrogen Mainly, return to the acidification unit as carrier gas. Organic sulfides such as methyl mercaptan, ethyl mercapta...

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Abstract

The invention provides an oil refining alkali dreg waste water acidizing processing method including the following steps: (1) acidification processing of oil refining alkali dreg waste water is performed, and nitrogen is introduced; (2) 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 the step (1) to be used as a carrier gas; (3) along with the acidification, the pH value is continued to decrease, and when 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; (4) after the acidification is continued to perform until the pH value is dropped to lower than 7, the acidified tail gas is totally returned to the step (1) to be used as the carrier gas; and (5) when the alkali dreg waste water pH value is dropped to 2-7, the acidification is stopped, and oil phase is separated. The oil refining alkali dreg waste water processing method can effectively remove sulfides in alkali dreg waste water, organic sulfide and hydrogen sulfide in the acidified tail gas can be respectively recovered, and recycled, and efficient economic acidification process can be realized.

Description

technical field [0001] The invention relates to an acidification treatment method for oil refining alkali slag waste liquid, which is especially suitable for the high-sulfur and high-COD alkali slag waste liquid produced in the alkali washing and refining process of catalytic gasoline and catalytic diesel oil, or catalytic gasoline alkali slag, catalytic diesel alkali slag, Mixed alkali residue waste liquid such as liquid hydrocarbon alkali residue. 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 concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C10G19/08C01B17/04
Inventor 赵磊刘志禹刘忠生王新王有华
Owner CHINA PETROLEUM & CHEM CORP
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