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A kind of treatment method of oil product refining waste lye

A treatment method and technology of waste lye, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems that are not used as inspection indicators, and achieve reduction of reagent usage, Effect of reducing phenol concentration and COD and realizing zero discharge

Active Publication Date: 2017-08-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 oil product refining waste lye

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Effect test

Embodiment 1

[0034] A stream of gasoline waste lye, its COD is 536000mg / L, S 2- The concentration is 12700mg / L, the concentration of phenol is 196000mg / L, the concentration of sodium carbonate is 23760mg / L, the concentration of sodium hydroxide is 2.6wt%, and the concentration of oil is 190mgL. A stream of liquid hydrocarbon waste lye containing organic nitrogen, its COD is 179000mg / L, the concentration of organic nitrogen is 8730mg / L, S 2- The concentration is 35800mg / l, the concentration of phenol is 32300mg / L, the concentration of sodium carbonate is 10800mg / L, the concentration of sodium hydroxide is 3.5wt%, and the concentration of oil is 150mg / L. Adopt the inventive method to process under the following conditions:

[0035] (1) Acidification and neutralization: Add concentrated sulfuric acid to gasoline waste lye, when the pH value of waste lye is 3-4, stop adding acid, stir for 30 minutes, and stand still for 24 hours. After the acidification treatment, the waste lye is divided in...

Embodiment 2

[0043] A stream of gasoline waste lye, its COD is 396800mg / L, S 2- The concentration is 9360mg / l, the concentration of phenol is 147000mg / L, the concentration of sodium carbonate is 18390mg / L, the concentration of sodium hydroxide is 2.9wt%, and the concentration of oil is 173mgL. A stream of liquid hydrocarbon waste lye containing organic nitrogen, its COD is 158200mg / L, the concentration of organic nitrogen is 7240mg / L, S 2- The concentration is 29320mg / l, the concentration of phenol is 28240mg / L, the concentration of sodium carbonate is 9920mg / L, the concentration of sodium hydroxide is 3.8wt%, and the concentration of oil is 135mg / L. Adopt the inventive method to process under the following conditions:

[0044] (1) Acidification and neutralization: add concentrated sulfuric acid to the waste gasoline lye, when the pH value of the waste lye is 5-6, stop adding acid, stir for 30 minutes, and stand still for 24 hours. After the acidification treatment, the waste lye is divi...

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Abstract

The invention discloses a treatment method for oil refining waste lye, comprising: (1) adding sulfuric acid to gasoline waste lye for acidification to recover crude phenol; (2) adding hydrogen oxidation to the acidic solution after recovering crude phenol Sodium adjusts the pH to be greater than 12; (3) Mix gasoline waste lye in step (2) with liquid hydrocarbon waste lye containing organic nitrogen for air flotation degreasing; Oxidation treatment; (5) Carry out gas-liquid separation of the mixed waste caustic; (6) Add sodium hydroxide to the waste caustic after gas-liquid separation, and recover the precipitated sodium carbonate; (7) Treat step (6) The waste lye is evaporated and concentrated. The invention can economically recycle crude phenol in gasoline waste lye, efficiently remove COD, organic nitrogen, phenol and sulfide in mixed waste lye, and recycle the sodium hydroxide solution produced after waste lye treatment, reducing Reagent usage is reduced, and zero discharge of waste lye is realized.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment method for oil refining waste lye, and the waste lye is gasoline refining waste lye and 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. Alkaline washing oil products. During this process, waste lye containing a large amount of pollutants is produced, including atmospheric diesel waste lye, catalytic gasoline waste lye, catalytic diesel waste lye, liquid hydrocarbon waste lye, etc. For oil refinery waste lye, the current domestic main treatment processes mainly include: direct treatment, chemical treatment and biological treatment. [0003] CN02130781.4 discloses a treatment method for oil refining soda slag. Evaporate the oil refining soda slag containing evaporation accelerator at 10...

Claims

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Application Information

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