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Comprehensive treatment method of naphthenic acid alkali residue waste liquid

A technology for comprehensive treatment of alkali slag waste liquid, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the impact of sewage treatment plants and other problems, and achieve COD reduction and operation The effect of mild conditions, good environmental benefits and economic benefits

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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  • Comprehensive treatment method of naphthenic acid alkali residue waste liquid

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Comparison scheme
Effect test

Embodiment 1

[0026] Atmospheric pressure diesel soda residue waste liquid from a refinery, in which COD is 2.13×10 5 mg / L, the sulfide is 638mg / L. Use the method of the present invention to process, first use N 2 and SO 2 The mixed gas is used to acidify the alkali slag waste liquid, and the N 2 :SO 2 =1:20 (molar ratio), until the pH of the alkali slag waste liquid drops to 2. Settle after acidification, separate the upper oil phase, recover naphthenic acid and neutral oil. The alkali slag waste liquid is acidified to remove more than 99.7wt% of sulfides, and the COD removal rate reaches 97.7wt%.

[0027] Slaked lime is used to causticize and regenerate the waste liquid after recovering the oil phase to produce calcium sulfite precipitation, the sulfite removal rate can reach more than 85wt%, and the alkalinity is restored to 50wt% of the original alkali slag waste liquid. Calcium sulfite can be roasted to obtain sulfur dioxide for recycling.

[0028] The alkali slag waste liquid t...

Embodiment 2

[0030] Atmospheric pressure diesel soda slag waste liquid in an oil refinery, in which COD is 2.98×10 5 mg / L, the sulfide is 1020mg / L. Use the method of the present invention to process, first use N 2 and SO 2 The mixed gas acidifies the alkali slag waste liquid, N 2 :SO 2 =1:30 (molar ratio), until the pH of the alkali slag waste liquid drops to 3. Settle after acidification, separate the upper oil phase, recover naphthenic acid and neutral oil. The alkali slag waste liquid is acidified to remove more than 99.7wt% of sulfides, and the COD removal rate reaches 98wt%.

[0031] Using quicklime to causticize and regenerate the waste liquid after recovering the oil phase, calcium sulfite precipitates are produced, the sulfite removal rate can reach more than 99.5wt%, and the alkalinity is restored to 50wt% of the original alkali slag waste liquid. Calcium sulfite can be roasted to obtain sulfur dioxide for recycling.

[0032] The alkali slag waste liquid treated by the meth...

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Abstract

The invention relates to a comprehensive treatment method of naphthenic acid alkali residue waste liquid. The comprehensive treatment method comprises the steps of: (1) acidizing the naphthenic acid alkali residue waste liquid by a N2 / SO2 gas mixture, and stopping acidizing when the pH value of the waste liquid reaches 2-6; (2) sending organic sulfides and acidified H2S tail gas discharged in the acidizing process in the step (1) into an acid gas pipe network in a refinery plant for centralized processing; (3) subsiding the acidic waste liquid generated after the acidizing process in the step (1), and recovering an oil phase, wherein the oil phase mainly contains naphthenic acid and a small amount of neutral oil; and (4) regenerating the waste liquid without the oil phase by using lime, separating out precipitates and acquiring regenerated alkali lye, which can be recycled for alkali refining process of oil or flue gas desulphurization. The comprehensive treatment method has low investment and mild operation conditions, can thoroughly remove sulfides in alkali residue and simultaneously recycle naphthenic acid and neutral oil in the alkali residue waste liquid, so as to realize reclamation of alkali residue waste liquid and avoid the impact of the high-concentration waste water on a sewage treatment plant; and certain economic benefit is achieved.

Description

technical field [0001] The invention relates to a treatment method for alkali slag waste liquid, in particular to a comprehensive treatment method for naphthenic acid-alkali slag waste liquid produced in the first, second and third line diesel alkali cleaning and 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 slag, catalytic gasoline and diesel soda slag, liquid hydrocarbon soda slag, 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C51/42C07C61/00
Inventor 赵磊刘忠生王有华王新周旗
Owner CHINA PETROLEUM & CHEM CORP