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A kind of treatment method of waste lye in ethylene production

A technology for ethylene waste lye and treatment methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of low recovery quality, high operating costs, and insufficient treatment effects and other issues, to achieve high economic and environmental benefits, to achieve the effect of zero emissions

Active Publication Date: 2016-11-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the above analysis, the current methods for treating waste lye are either inappropriate, or the treatment effect is insufficient, or the investment and operating costs are high, or the recovery quality is not high, or the waste lye after treatment needs to be discharged to sewage treatment system, or will produce high-salt wastewater and many other problems

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  • A kind of treatment method of waste lye in ethylene production

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Embodiment 1

[0029]A waste lye produced by an ethylene plant, wherein: COD is 58000mg / L, and the concentration of sodium sulfide is 2.9wt% (S 2- : 12200mg / L), the concentration of sodium carbonate is 2.0wt% (20500mg / L), the concentration of sodium hydroxide is 1.6wt%, and the concentration of oil is 240mg / L. The process of the present invention is carried out under the following conditions.

[0030] Air flotation degreasing: Air is introduced into the ethylene waste lye to generate air bubbles in the waste lye, and the trace 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 16mg / L.

[0031] High-temperature wet oxidation treatment: add 50wt% sodium hydroxide solution to the waste lye, preferably the sodium hydroxide solution obtained after the treatment of the present invention. Add 50L of 50wt% sodium hyd...

Embodiment 2

[0036] A waste lye produced by an ethylene unit, wherein: COD is 33000mg / L, and the concentration of sodium sulfide is 2.1wt% (S 2- : 8831mg / l), the concentration of sodium carbonate is 1.1wt% (11275mg / L), the concentration of sodium hydroxide is 1.2wt%, and the concentration of oil is 175mg / L. The process of the present invention is carried out under the following conditions.

[0037] 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.

[0038] High-temperature wet oxidation treatment: add 40wt% sodium hydroxide solution to the waste lye, preferably the sodium hydroxide solution obtained after the treatment of the present invention. Add 60L of 40wt% sodium hydr...

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Abstract

The invention relates to a treatment method for waste lye in ethylene production, which includes: (1) air flotation and oil removal to remove oily substances entrained in ethylene waste lye; (2) high-temperature wet oxidation treatment to remove oil Sodium hydroxide is added to the lye to make it react under alkaline conditions; (3) Sulfuric acid treatment, adding concentrated sulfuric acid to the waste lye after high-temperature wet oxidation treatment to generate sodium sulfate; (4) Evaporation and concentration: for Evaporate and concentrate the waste lye after sulfuric acid treatment; (5) adjust the alkali concentration, add solid sodium hydroxide to the waste lye after evaporation and concentration, recover the precipitated sodium sulfate, and reuse the high-concentration sodium hydroxide solution Step (2) and / or upstream caustic scrubber. The invention can efficiently remove COD and sulfide in the waste ethylene lye, and can effectively recover calcium carbonate and sodium sulfate, reuse the treated sodium hydroxide solution, and realize zero discharge of the ethylene waste lye.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for waste lye in ethylene production in a chemical plant. Background technique [0002] In the process of ethylene production, alkali washing is generally used to remove CO in cracked gas. 2 、H 2 S and other acid gases. The alkaline cleaning process produces a large amount of spent lye, which contains NaOH generated during the alkaline cleaning process in addition to the remaining NaOH. 2 S, Na 2 CO 3 and other inorganic salts. On the other hand, due to the condensation of heavy components in the cracked gas and the polymerization of diolefins and aldehydes during the alkali cleaning process, a large amount of organic matter enters the waste alkali solution. [0003] Ethylene waste lye is a high-concentration organic wastewater with high sulfide and salt content, making it difficult to treat. With the expansion of the scale of ethylene pl...

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娇
Owner CHINA PETROLEUM & CHEM CORP
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