Comprehensive treatment method of liquid hydrocarbon alkali residue waste liquid

A technology for comprehensive treatment of alkali slag waste liquid, applied to chemical instruments and methods, sulfur compounds, refined hydrocarbon oil, etc., to achieve mild operating conditions, good economic benefits, and simple processes

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, this method will produce alkaline was...

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  • Comprehensive treatment method of liquid hydrocarbon alkali residue waste liquid

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Embodiment 1

[0031] A certain enterprise alkali washing liquid hydrocarbon alkali slag waste liquid, in which COD is 1.27×10 5 mg / L, the sulfide is 1.08×10 4 mg / L, volatile phenol 1.99×10 4 mg / L. Use the method of the present invention to process, at first with N 2 As a carrier gas, carrying SO 2 Acidification of alkali slag waste liquid, N 2 / SO 2 =100 (molar ratio), until the pH of the alkali slag waste liquid drops to 3-4. The desulfurization adsorbent is used to absorb the organic sulfide in the tail gas and then sent to the Claus plant in the sulfur plant to make sulfur. The desulfurizer can be recycled and used through regeneration. After acidifying the water phase, let it stand to recover the phenol in the water layer. After acidification treatment, more than 99.5% of sulfides are removed, more than 80% of phenols are removed, and COD is reduced by more than 60%.

[0032] Use Ca(OH) 2 Precipitate and regenerate the acidic water after recovering phenol to produce calcium sul...

Embodiment 2

[0035] Liquid hydrocarbon alkali slag waste liquid of an enterprise, in which COD is 1.25×10 5 mg / L, sulfide is 1.78×10 4 mg / L, volatile phenol 7.17×104 mg / L. Use the method of the present invention to process, at first with N 2 As a carrier gas, carrying SO 2 Acidification of alkali slag waste liquid, N 2 / SO 2 =50 (molar ratio), until the pH of the alkali slag waste liquid drops to 3-4. The desulfurization adsorbent is used to absorb the organic sulfide in the tail gas and then sent to the Claus plant in the sulfur plant to make sulfur. The desulfurizer can be recycled and used through regeneration. The aqueous phase after acidification is left to stand to recover the crude phenol in the water layer. After acidification treatment, the removal rate of sulfide in the water phase can reach more than 99.7%, the removal rate of phenol can reach more than 80%, and the COD can be reduced by more than 60%.

[0036] Use Ca(OH) 2 Precipitate and regenerate the acidic water aft...

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Abstract

The invention relates to a comprehensive treatment method of liquid hydrocarbon alkali residue waste liquid. The comprehensive treatment method comprises the steps of: (1) acidizing the liquid hydrocarbon alkali residue waste liquid by a N2/SO2 gas mixture, wherein sulfide in the waste liquid volatilizes in the form of H2S along with the continuous increase of the acidity of the waste liquid; and stopping acidizing when the pH value of the waste liquid reaches 2-6; (2) sending tail gases discharged in the acidizing process in the step (1) into a sulphur production device for preparing sulphur; (3) subsiding the waste liquid generated after the acidizing process in the step (1), and recovering an oil phase, wherein the oil phase mainly contains crude phenol which can be further recovered; and (4) regenerating the waste liquid without the oil phase by using lime, wherein the regenerated waste liquid can be recycled for refinement process of liquid hydrocarbon alkali after precipitates are separated out from the regenerated waste liquid. The comprehensive treatment method is low in investment; the process is simple and flexible; operation conditions are mild; due to the application of the comprehensive treatment method, the alkali residue waste liquid is recycled, the impact of high-concentration waste water on a sewage treatment plant is avoided, simultaneously the sulfide and crude phenol in the alkali residue waste liquid can be recycled, 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 alkali slag waste liquid produced in the process of liquid alkali cleaning and refining. Background technique [0002] In the process of alkaline cleaning and refining of oil products in refineries, alkaline waste liquid containing high concentrations of pollutants is produced, and the emissions of COD, sulfides and phenols account for more than 40% to 50% of the emissions of such pollutants in refineries. It is mainly composed of atmospheric 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 the sewage up to the standard, and serious...

Claims

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Application Information

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IPC IPC(8): C10G19/08C01B17/06C01B17/50C07C37/68
Inventor 刘忠生赵磊王有华王新周旗
Owner CHINA PETROLEUM & CHEM CORP
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