A kind of treatment method of oil refining alkali residue waste liquid

A technology for refining alkali residue and treatment method, applied in combustion methods, chemical instruments and methods, water/sewage multi-stage treatment, etc. Efficient removal effect

Active Publication Date: 2019-06-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tail gas produced during the acidification process contains a large amount of organic sulfides such as mercaptans. If it is sent to the sulfur production unit, it will have a great impact on the stable operation of the sulfur production system.

Method used

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  • A kind of treatment method of oil refining alkali residue waste liquid

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Embodiment 1

[0035] Catalytic gasoline alkali residue in a refinery, where COD is 3.21×10 5 mg / L, sulfide is 1.76×10 4 mg / L, volatile 1.07×10 5 mg / L. The method of the present invention is used for acidification treatment. First, concentrated sulfuric acid is introduced for acidification, and a certain amount of nitrogen is introduced for blowing off. When the pH value of the alkali residue in the acidification reactor is reduced to 13.5, the addition of concentrated sulfuric acid is stopped. The acidification tail gas produced by the acidification is passed into the incinerator for incineration, and at the same time, combustion-supporting oxygen is passed into the incinerator. The amount of oxygen introduced is 3 times the theoretical combustion oxygen demand of the acidification tail gas. The generated high-temperature acid gas first enters the acidification reactor to acidify the alkali slag, and when the temperature in the alkali slag waste liquid is higher than 80 ℃, it is passed into t...

Embodiment 2

[0038] Liquid hydrocarbon alkali residue of a refinery, where COD is 7.97×10 4 mg / L, sulfide is 4×10 3 mg / L, volatile phenol 1.4×10 4 mg / L. Use the method of the present invention to carry out the acidification treatment, firstly pass the gas acidification reagent SO 2 Carry out acidification and blow in a certain amount of nitrogen to blow off, reduce the pH value of the alkali residue in the acidification reactor to 13, and stop adding SO 2 . The acidification tail gas produced by acidification is passed into the incinerator for incineration, and at the same time, combustion-supporting oxygen is passed into the incinerator. The amount of oxygen introduced is 5 times the theoretical combustion oxygen demand of the acidification tail gas. The generated high-temperature acid gas first enters the acidification reactor to acidify the alkali slag. When the temperature of the alkali slag waste liquid is higher than 60°C, it is passed into the waste heat boiler to produce steam, and t...

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Abstract

The invention discloses a processing method of oil refining alkaline residue waste liquid. The processing method comprises the following steps: (1) adding an acidifying reagent into an acidification reactor, and stopping acidification when the pH value reaches 13 to 14; (2) burning the volatile acidification tail gas generated in the step (1) to obtain high temperature acidic gas; (3) returning the high temperature acidic gas to the acidification reactor to acidify the alkaline residues, heating, and burning the generated acidification tail gas like the step (2); (4) when the pH value of the alkaline residues is reduced to 7-8, stopping burning, adding sulfuric acid to adjust the pH value to 2-6, and stopping acidification; (5) cooling the alkaline residues obtained in the step (4), carrying out settlement, and recovering the oil phase; (6) after oil phase recovering, adding sodium hydroxide into alkaline residues to carry out alkali precipitation. The provided processing method can efficiently remove sulfides, COD, phenol, and sulfite radicals in oil refining alkaline residues, the discharge of waste liquid is reduced, the waste gas generated in alkaline residue acidification is effectively utilized, the acidifying reagent and energy are utilized in a balance mode, the energy and resources are saved, and secondary pollution to the environment is reduced.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and specifically relates to a method for processing oil refinery alkali residue waste liquid. Background technique [0002] During the caustic washing and refining process of oil refineries, alkaline waste liquids containing high concentrations of pollutants are produced, and the emissions of COD, sulfides and phenols account for more than 40wt%-50wt% of the emissions of such pollutants in the refinery. These alkaline slag waste liquids, if directly discharged, will seriously pollute the environment and severely corrode equipment. In recent years, as the national environmental protection regulations and standards have become more complete and strict, and people's calls for improving environmental quality have increased, alkali slag treatment has received more and more attention. [0003] At present, the commonly used alkali residue treatment methods are mainly neut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04F23G7/06C10G19/08
Inventor 刘志禹赵磊刘忠生王新王海波
Owner CHINA PETROLEUM & CHEM CORP
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