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A kind of treatment method of liquid hydrocarbon waste lye containing organic nitrogen

A liquid hydrocarbon waste lye and treatment method technology, 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 achieve oil removal efficiency Improved effect

Active Publication Date: 2017-04-12
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 kind of treatment method of liquid hydrocarbon waste lye containing organic nitrogen

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A stream of liquid hydrocarbon waste lye 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:

[0035] (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.

[0036] (2) High-temperature wet oxidation treatment: the reaction temperature of the treatment is 290°C, the reaction pressure is 12.0MPa, and the reaction residen...

Embodiment 2

[0043] A stream of liquid hydrocarbon waste lye containing organic nitrogen, its COD is 463500mg / L, the concentration of organic nitrogen 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:

[0044] (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.

[0045] (2) High-temperature wet oxidation treatment: the reaction temperature of the treatment is 270°C, the reaction pressure is 9.0MPa, and the reaction residence tim...

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Abstract

The present invention discloses a treatment method of an organic nitrogen-containing liquid-state hydrocarbon waste alkali liquid. The treatment method comprises: (1) carrying out air flotation oil removing; (2) carrying out high-temperature wet oxidation treatment on the oil removed waste alkali liquid; (3) cooling the waste alkali liquid being subjected to the wet oxidation treatment; (4) adding sulfuric acid to the cooled waste alkali liquid to neutralize the unprecipitated sodium carbonate; (5) adding MgCl2.6H2O and Na2HPO4.12H2O, and adjusting the pH value to remove ammonia nitrogen; (6) adding sodium hydroxide to the obtained waste alkali liquid; and (7) carrying out evaporation concentration on the waste alkali liquid, recovering the precipitated sodium sulfate, and reusing the high concentration sodium hydroxide solution into the steps (5) and (6) 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 waste alkali liquid can be efficiently removed, the sodium carbonate and the sodium sulfate in the waste alkali liquid being subjected to the wet oxidation treatment and the magnesium ammonium sulfate precipitate produced during the ammonia nitrogen removing process can be recovered while the produced sodium hydroxide solution produced after the treatment can be recycled, and the zero emission of the liquid-state hydrocarbon waste alkali liquid is achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection wastewater treatment, and in particular relates to a treatment method for liquid hydrocarbon 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. Liquid hydrocarbon waste lye is a kind of oil refinery waste lye, which has strong alkalinity and contains high concentration of sulfide and organic matter. If it is not properly pretreated, the high concentration of waste lye will seriously affect the sewage treatment plant. Normal o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/00
Inventor 周彤邓德刚许莹秦丽姣
Owner CHINA PETROLEUM & CHEM CORP