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Method for processing process waste water of dimethyl ether preparation by dehydrating methyl alcohol

A technology for methanol dehydration and wastewater treatment, which is used in water/sewage multi-stage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of resource utilization

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

Problems solved by technology

The purpose of the treatment is also to meet the discharge standards, which does not involve the recovery of organic matter and the reuse of water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Wastewater source: methanol liquid phase dehydration to produce dimethyl ether process wastewater.

[0028] a. Use an 8-effect evaporator to distill the waste water, the condensate accounts for about 30% of the total water, the COD of the condensate is about 35,000 mg / L, the distillation raffinate accounts for about 70% of the total water, and the COD is about 800mg / L.

[0029] b. Perform reverse osmosis membrane separation on the condensate described in a. The recovered organic matter is processed into different products through separation and purification. The COD of the aqueous phase is relatively high (about 200mg / L), and it is combined with the distillation raffinate.

[0030] c. The distillation raffinate mentioned in a above is treated by a conventional combined treatment process of two-stage UASB anaerobic reactor, aerobic activated sludge process, biological contact oxidation, and sand filtration. The effluent COD is less than 60mg / L. The biogas produced b...

Embodiment 2

[0033] Wastewater source: Wastewater from methanol gas phase dehydration to produce dimethyl ether process.

[0034]a. Use a simple distillation system to distill the waste water, the condensate accounts for about 20% of the total water, and the COD in the condensate is about 15,000 mg / L. The distillation raffinate accounts for about 80% of the total water, and the COD is about 1000mg / L.

[0035] b. The condensate mentioned in a above is deeply purified by a purification process mainly based on membrane separation. The concentrated solution of membrane separation, that is, the organic matter can be reused in the production process of methanol dehydration to produce dimethyl ether after recovery, or can be separated and purified by other means to be processed into different products. The effluent COD is less than 20mg / 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 q...

Embodiment 3

[0039] Wastewater source: Syngas one-step preparation of dimethyl ether process wastewater.

[0040] a. Use a 2-effect evaporator to evaporate the effluent water mentioned in the above a. The condensate accounts for about 10% of the total water, and the COD of the condensate is about 20,000 mg / L. The distillation raffinate accounts for about 90% of the total water, and the COD is about 2000mg / L.

[0041] b. The condensate mentioned in a above is deeply purified by a purification process mainly based on membrane separation. After the organic matter is recovered, it can be reused in the production process of methanol dehydration to produce dimethyl ether or separated and purified by other means to be processed into different products. The COD of the water phase is low (about 25mg / L), and it can be directly reused in the boiler.

[0042] c. The distillation raffinate mentioned in a above is treated by a conventional combined treatment process of two-stage UASB anaerobic reactor...

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Abstract

The invention provides a method of treating the process effluent of dimethyl ether synthesis via methanol dehydration. The method at least comprises the following three steps: the first step, the process effluent is divided into two flows through the evaporation, wherein one flow is rich in organic substances and the other flow is poor in organic substances; the second 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 third step, the flow poor in organic substances is subjected to the biochemical treatment so that the water quality meets the requirements on reclaimed water. Optionally, the method further comprises the fourth step, that is, the reclaimed water is treated by the water quality stabilization technology to meet the reclaimed water treatment requirement on the production equipment. 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 in the process of preparing dimethyl ether by methanol dehydration. Background technique [0002] Dimethyl ether, also known as wood ether, is an emerging basic chemical raw material. Due to its good characteristics of easy compression, condensation, and vaporization, it has many unique uses in chemical industries such as pharmaceuticals, fuels, and pesticides. With the shortage of petroleum resources and rising prices, and the deepening of the concept of clean and environmental protection, the clean fuel dimethyl ether as a diesel alternative resource has been vigorously promoted, and has gradually entered the civil fuel market and the automobile fuel market. In the long run, the market prospect of dimethyl ether is broad, and it is a sunrise chemical product that is rapidly rising in the world. [0003] The production methods of DME mainly include traditional method, one-step method and two...

Claims

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Application Information

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