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A treatment method for oil refinery waste lye containing organic nitrogen

A technology for oil refining waste lye and treatment methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems that have not been used as inspection indicators, and improve oil removal efficiency , good treatment effect and simple process

Active Publication Date: 2017-07-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional treatment method only examines the removal effect of COD and sulfide in waste caustic soda, and does not take the removal of organic nitrogen contained in it as an investigation index.

Method used

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  • A treatment method for oil refinery waste lye containing organic nitrogen

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Effect test

Embodiment 1

[0030] A stream of waste lye from oil refinery containing organic nitrogen, its COD is 358000mg / L, the concentration of organic nitrogen is 10670mg / L, S 2- The concentration is 46900mg / L, the concentration of phenol is 89000mg / L, the concentration of sodium carbonate is 19800mg / L, the concentration of sodium hydroxide is 3wt%, and the concentration of oil is 190mg / L. Adopt the inventive method to process under the following conditions:

[0031] (1) Air flotation degreasing: Air is introduced into the waste lye to generate air bubbles in the waste lye, and a small amount of light oil entrained in the waste lye sticks to the air bubbles, and is removed by floating on the water surface with the gas. After the air flotation and oil removal treatment, the oil content in the waste caustic liquor was reduced to 13mg / L.

[0032] (2) High-temperature wet oxidation treatment: the reaction temperature of the treatment is 270°C, the reaction pressure is 9.0MPa, and the reaction time is 4...

Embodiment 2

[0037] A stream of waste lye from oil refinery containing organic nitrogen, its COD is 463500mg / L, organic nitrogen concentration is 11980mg / L, S 2- The concentration is 68000mg / l, the concentration of phenol is 113600mg / L, the concentration of sodium carbonate is 21300mg / L, the concentration of sodium hydroxide is 2.6wt%, and the concentration of oil is 230mg / L. Adopt the inventive method to process under the following conditions:

[0038] (1) Air flotation degreasing: Air is introduced into the waste lye to generate air bubbles in the waste lye, and a small amount of light oil entrained in the waste lye sticks to the air bubbles, and is removed by floating on the water surface with the gas. After air flotation and deoiling treatment, the oil content in the waste caustic liquor is reduced to 15mg / L.

[0039] (2) High-temperature wet oxidation treatment: the reaction temperature of the treatment is 290°C, the reaction pressure is 12.0MPa, and the reaction time is 60min. Add ...

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Abstract

The present invention discloses a treatment method of an organic nitrogen-containing oil refining waste alkali liquid. The treatment method comprises: (1) carrying out air flotation oil removing to remove oil substances entrained in the waste alkali liquid; (2) carrying out high-temperature wet oxidation, wherein the oil removed waste alkali liquid is subjected to a high-temperature wet oxidation treatment; (3) carrying out gas-liquid separation, wherein the treated waste alkali liquid is subjected to gas-liquid separation; (4) adding sodium hydroxide to the waste alkali liquid being subjected to the gas-liquid separation so as to increase the concentration of the sodium hydroxide in the waste alkali liquid; and (5) carrying out evaporation concentration, wherein the waste alkali liquid being subjected to the alkali concentration adjusting is subjected to evaporation concentration, and the produced high concentration sodium hydroxide solution is reused in the step (4) and / or the alkali washing tower on the upstream. With the method of the present invention, the COD, the sulfides and the organic nitrogen in the oil refining waste alkali liquid can be efficiently removed, the sodium salt in the waste alkali liquid being subjected to the wet oxidation treatment can be recovered while the produced sodium hydroxide solution can be recycled, and the zero emission of the oil refining waste alkali liquid is achieved.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for oil refinery waste lye containing organic nitrogen. Background technique [0002] In my country's refineries, many oil refining processes use alkali refining process, that is, using NaOH solution to absorb H 2 S. Alkali washing oil products, in this process, waste alkali liquid containing a large amount of pollutants, that is, alkali residue waste liquid, is mainly composed of atmospheric diesel alkali residue, catalytic gasoline alkali residue, catalytic diesel alkali residue, liquid hydrocarbon alkali residue, etc. composition. This type of spent caustic is highly alkaline and contains high concentrations of sulfides and organics. Without proper pretreatment, high-concentrated spent caustic will seriously affect the normal operation of sewage treatment plants and the discharge of total effluents up to standard . For oil refinery waste l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/38
Inventor 邓德刚周彤秦丽姣
Owner CHINA PETROLEUM & CHEM CORP
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