Extraction method of heavy fraction of ft synthetic product from slurry bed reactor

Abstract

The invention provides a method for extracting Fischer-Tropsch synthesis product heavy distillate from a slurry bed reactor, concretely comprising the following steps: in the slurry bed reactor, when a Fischer-Tropsch reaction gas phase stream and a slurry phase stream flow through a metal sintering filter stick arranged in a liquid phase of the slurry bed reactor, the Fischer-Tropsch synthesis heavy distillate and part of catalyst powder can be separated out from the slurry phase of the slurry bed reactor; and the Fischer-Tropsch synthesis heavy distillate and part of catalyst powder are fed into a subsequent solid-liquid separation device for further separating the Fischer-Tropsch synthesis heavy distillate and the catalyst powder, so as to make the obtained Fischer-Tropsch synthesis heavy distillate meet the demand of downstream processing. The method avoids the catalyst particles from being brought out from the top part of the reactor by the gas phase stream and depositing on equipment such as a heat exchanger after being further crushed, and also improves the operational stability of the slurry bed reactor and extends the operation cycle of the apparatus, and can also provide qualified Fischer-Tropsch synthesis product heavy distillate to downstream units.

Description

technical field [0001] The invention relates to a method for separating a slurry bed Fischer-Tropsch synthesis catalyst and a product heavy fraction. Background technique [0002] Fischer-Tropsch synthesis is an important indirect coal liquefaction technology for producing synthetic liquid fuels and chemical raw materials from coal. Due to the characteristics and technical and economic advantages of slurry bed Fischer-Tropsch synthesis, the technology of slurry bed Fischer-Tropsch synthesis has been vigorously developed in recent years. The slurry bed reactor requires that the particle size of the catalyst should not be too large, otherwise the catalyst and the product cannot form a slurry phase, but this also brings about the difficulty of separating the catalyst from the Fischer-Tropsch synthesis product. In order to solve this problem, people focus on the process of placing a filter device in the slurry bed reactor to extract the heavy fraction of the Fischer-Tropsch syn...

AI Technical Summary

Problems solved by technology

These finer particles will be taken out from the top of the slurry bed reactor by the gas phase flow and deposited in heat exchangers and other equipment, which will cause the entire device to be shut down due to excessive pressure drop in the gas circulation system.

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