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A kind of processing method of ethylene waste lye

A technology for ethylene waste lye and treatment methods, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., and can solve high operating costs, inappropriate waste lye, and large investment and other issues, to achieve the effect of guaranteeing recovery rate, reducing usage, and effectively recycling

Active Publication Date: 2016-08-17
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

Method used

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  • A kind of processing method of ethylene waste lye

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Effect test

Embodiment 1

[0027] One piece of waste lye produced in the production process of ethylene, wherein: COD is 58000mg / L, sodium sulfide concentration 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. Adopt the inventive method to process under the following conditions:

[0028] 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 air flotation and deoiling treatment, the oil content in the waste caustic liquor was reduced to 16mg / L.

[0029]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 120L of 50wt% sodium hydrox...

Embodiment 2

[0033] One piece of waste lye produced in the production process of ethylene, wherein: COD is 33000mg / L, and sodium sulfide concentration 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. Adopt the inventive method to process under the following conditions:

[0034] 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.

[0035] 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 150L of 40wt% so...

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Abstract

The invention relates to a treatment method for ethylene waste lye, which includes: (1) air flotation and degreasing to remove oily substances entrained in ethylene waste lye; (2) high-temperature wet oxidation treatment to remove oil from waste lye Sodium hydroxide is added to make it undergo high-temperature wet oxidation treatment under alkaline conditions; (3) Evaporation and concentration, the waste lye after high-temperature wet oxidation treatment is evaporated and concentrated to increase the concentration of sodium hydroxide in the waste lye (4) Adjust the alkali concentration, add solid sodium hydroxide to the waste alkali solution after evaporation and concentration, recover the precipitated sodium sulfate and sodium carbonate, and reuse the high-concentration sodium hydroxide solution to step (2) and / or Upstream caustic scrubber. The method of the invention can efficiently remove COD and sulfide in the spent ethylene lye, can effectively recover sodium salt, and reuse the treated sodium hydroxide solution, thereby realizing zero discharge of the spent ethylene lye.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for ethylene waste lye 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 content of COD, sulfide and salt, making it difficult to treat. With the expansion of the scale of ethylene plants, ...

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娇
Owner CHINA PETROLEUM & CHEM CORP
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