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Alcohol-water separation recycling method of fischer-tropsch synthesis reaction water

A Fischer-Tropsch synthesis and alcohol-water separation technology, applied in the field of environmental protection and resource utilization, can solve the problems of insufficient use of reaction water and high energy consumption, achieve good environmental protection and economy, reduce operating energy consumption, and save resources and energy. Effect

Active Publication Date: 2014-02-26
上一环保科技(杭州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a method for the separation and recovery of alcohol and water in Fischer-Tropsch synthesis reaction water, which solves the problem of high energy consumption and inability to fully utilize the organic raw materials in the reaction water in the prior art when processing the reaction water. technical problem

Method used

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  • Alcohol-water separation recycling method of fischer-tropsch synthesis reaction water

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Effect test

Embodiment 1

[0027] Synthetic water source: F-T synthetic reaction water using cobalt-based catalysts. pH value is 3, it contains C1-C8 alcohol, the total mass content of alcohol is 5.5%, trace alkanes and alkenes, the rest is water, and the oil content is 350mg / L.

[0028] (1) Pretreatment: The Fischer-Tropsch synthesis reaction water is neutralized by adding alkali to a pH value of 9. After coagulation reaction, it enters the air flotation system to remove oil and impurities, and then is further treated by sand filter and precision filter to obtain oil-containing Raw material water containing mixed alcohol with an amount of 4mg / L;

[0029] (2) Separation of alcohol and water: the pretreated raw water enters the alcohol-permeable membrane device of the organic composite membrane for pervaporation treatment, separates the alcohol and water, and obtains separated water and 33% (wt) low-concentration mixed alcohol liquid; reuse The liquid-liquid separation device separates the separated low...

Embodiment 2

[0034] Synthetic water source: F-T synthetic reaction water using cobalt-based catalysts. pH value is 4, it contains C1-C8 alcohol, the total mass content of alcohol is 4.2%, trace alkanes and alkenes, the rest is water, and the oil content is 300mg / L.

[0035] (1) Pretreatment: The Fischer-Tropsch synthesis reaction water is neutralized by adding alkali to a pH value of 6. After coagulation reaction, it enters the air flotation system to remove oil and impurities, and then is further treated by sand filter and precision filter to obtain oil-containing The amount is the raw material water containing mixed alcohol of 4.5mg / L;

[0036] (2) Separation of alcohol and water: the pretreated raw water enters the alcohol-permeable membrane device of the organic composite membrane for pervaporation treatment, separates the alcohol and water, and obtains separated water and 28% (wt) low-concentration mixed alcohol liquid; reuse The liquid-liquid separation device separates the separate...

Embodiment 3

[0041]The working steps of this example are basically the same as those of Example 2, the difference is that in (1) pretreatment, the Fischer-Tropsch synthesis reaction water is neutralized to a pH value of 7.5 by adding alkali, and in step (5), return to During water treatment, reusable reclaimed water with a pH value of 7.3 is obtained.

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Abstract

The invention discloses an alcohol-water separation recycling method of fischer-tropsch synthesis reaction water, belongs to the technical fields of environmental protection and recycling, and solves the technical problems that the energy consumption is high in treatment of the reaction water, and an organic raw material in the reaction water cannot be fully utilized in the prior art. The alcohol-water separation recycling method comprises the following steps: (1) pretreatment, namely adjusting the pH value of the reaction water, suspended solids and oil content after carrying out alkaline neutralization, coagulation air floatation and multi-stage filtering on the fischer-tropsch synthesis reaction water; (2) alcohol-water separation, namely carrying out pervaporation treatment on the pretreated raw material water by adopting a membrane process; (3) alcohol liquid concentration, namely distilling a low-carbon alcohol liquid to obtain the low-carbon alcohol liquid of which the concentration is greater than 70% (wt) by using a distillation tower; and (4) alcohol liquid dehydration, namely carrying out vapor permeation dehydration on a high-concentration mixed alcohol solution by using the membrane process. By adopting the alcohol-water separation recycling method, available resources which are discharged as wastewater in the past are effectively recovered by using low energy consumption; a disadvantage is converted into an advantage; resources and energy sources are saved; and the target of recycling to create profit is also achieved.

Description

technical field [0001] The invention relates to an alcohol-water separation and recovery method for Fischer-Tropsch synthesis reaction water, which belongs to the technical field of environmental protection and resource utilization. Background technique [0002] With the rapid development of the economy, the requirements for environmental protection are getting higher and higher, and the available resources are getting less and less. In the process of industrial production, especially in petrochemical, fine chemical and other industries, a large number of industrial by-products are produced, and some by-products have great recycling value. If these waste water and waste liquid are not properly treated and discharged directly, it will have a bad impact on the surrounding environment and affect human health. At the same time, the waste or discharge of such valuable organic solvents also causes a serious waste of resources. [0003] The gas-to-liquid (GTL) technology of produ...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/80C07C31/02
CPCC02F1/24C02F1/448C02F1/52C02F1/66C02F3/00C02F9/00C07C29/76Y02P20/10Y02P20/50
Inventor 叶舟曾淼
Owner 上一环保科技(杭州)有限公司
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