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Method for processing process waste water of ethylene preparation by ethanol dehydration

A technology for ethanol dehydration and wastewater treatment, which is applied in the directions of heating water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as the reuse method of ethylene process wastewater that has not yet been seen, and achieve Realize the effect of resource utilization

Active Publication Date: 2009-03-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Consulted 10 patent and literature databases at home and abroad, including the American Chemical Abstracts database. According to the obtained information, there is no relevant recycling method directly aimed at the dehydration of ethanol to produce ethylene process wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Wastewater source: Ethanol dehydration to produce ethylene process wastewater, COD is about 6000mg / L.

[0027] a. Use a coalescing filter for oil-water separation. The oil content in the effluent is less than 100mg / L.

[0028] b. Use a 2-effect evaporator to distill the waste water, the condensate accounts for about 10% of the total water, and the COD is about 60,000 mg / L. The distillation raffinate accounts for about 90% of the total water, and the COD is about 800mg / L.

[0029] c. The condensate mentioned in b is deeply purified by a purification process mainly based on membrane separation. The concentrated liquid, that is, the recovered organic matter, can be separated and purified by other means to be processed into different products. The COD of the water phase is less than 10mg / L, the pH value is between 7.0-8.0, the total dissolved solids (TDS) content is less than 100mg / L, and the turbidity is less than 1.0NTU, which meets the water quality requirements of bo...

Embodiment 2

[0033] Wastewater source: Ethanol dehydration to produce ethylene process wastewater, COD is about 20000mg / L.

[0034] a. Use a pressurized dissolved air flotation device for oil-water separation. The oil content in the effluent is lower than 50mg / L.

[0035] b. Use 4-effect evaporator to distill the waste water, the condensate accounts for about 20% of the total water, and the COD is about 80,000 mg / L. The concentrated solution accounts for about 80% of the total water, and the COD is about 800mg / L.

[0036] c. The condensate mentioned in b above is deeply purified by a purification process mainly based on membrane separation. After the organic matter is recovered, it is separated and purified by other means and processed into different products. The COD of the effluent is less than 10mg / L, the pH value is between 7.0-8.0, the total dissolved solids (TDS) content is less than 100mg / L, and the turbidity is less than 1.0NTU. It is reused as water for the washing tower in the p...

Embodiment 3

[0040] Wastewater source: Ethanol dehydration to produce ethylene process wastewater, COD is about 60000mg / L.

[0041] a. Use a coalescing filter for oil-water separation. The treated effluent oil content is lower than 100mg / L.

[0042] b. Use an 8-effect evaporator to evaporate the effluent described in a above, the condensate accounts for about 30% of the total water, and the COD is about 180,000 mg / L. The distillation raffinate accounts for about 70% of the total water, and the COD is about 600mg / L.

[0043] c. The condensate mentioned in b above is deeply purified by a purification process mainly based on membrane separation. The concentrated liquid, that is, the recovered organic matter, can be separated and purified by other means to be processed into different products. The effluent COD is about 300mg / L, which is combined with the distillation raffinate in b.

[0044] d. The distillation raffinate mentioned in b above is treated by a conventional combined treatment ...

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Abstract

The invention provides a method for treating the process effluent of ethylene synthesis via ethanol dehydration. The method at least comprises the following four steps: the first step, the process effluent is subjected to the degreasing treatment so that the content of hydrocarbon compounds in the process effluent is reduced below 100mg / L; the second step, after the degreasing treatment, the effluent is divided into two flows by evaporation, wherein one flow is rich in organic substances and the other flow is poor in organic substances; the third step, the flow rich in organic substances is subjected to the membrane separation, the organic substances in the concentrate is recovered, and the water phase is reutilizes; and the fourth step, the flow poor in organic substances is subjected to the biochemical treatment so that the water quality meets the requirements for reclaimed water. The method can recycle the whole effluent after treatment and reclaim the organic substances in the effluent, and achieves the effect of resource utilization of the process effluent and the organic substances in the process effluent.

Description

technical field [0001] The invention relates to a treatment method for waste water from ethanol dehydration to prepare ethylene process. Background technique [0002] Ethylene is an important basic organic chemical product. In recent years, with the soaring price of crude oil, the production cost of ethylene by cracking method has risen sharply, and the breakthrough of biomass ethanol production technology is expected to make the price of ethanol drop sharply. Therefore, the technology of ethanol dehydration to ethylene has been paid more and more attention. Compared with cracking ethylene, ethanol dehydration ethylene technology has its own advantages: small equipment investment, short construction period, fast income and high product purity. Therefore, in the long run, ethanol will become the basic raw material to support the petrochemical industry that uses ethylene as raw material. [0003] The ethanol dehydration reaction is an acid-catalyzed dehydration reaction. The...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/40C02F1/04C02F1/44
Inventor 李本高秦冰
Owner CHINA PETROLEUM & CHEM CORP
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