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

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...

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