Method for producing linear alpha-olefins (LAOs) through Fischer-Tropsch synthesis of solvent phase

Abstract

The invention discloses a solvent phase Fischer-Tropsch synthesis method. The method is characterized in that a Fischer-Tropsch synthesis reaction is carried out in a heterogeneous reaction system; a polar solvent is taken as the reaction medium; a traditional granular Fischer-Tropsch synthesis catalyst is suspended or soaked in the polar solvent phase to carry out the Fischer-Tropsch synthesis reaction; and as the generated hydrocarbon products are insoluble in the polar solvent, the phases are voluntarily split. The method can be used for producing linear alpha-olefins (LAOs) with various carbon numbers. By applying the method, the reaction products can rapidly leave the inner and outer surfaces of the catalyst to reduce the probability of readsorption and secondary reaction, thus improving the yield of the LAOs. The Fischer-Tropsch synthesis reaction can be carried out in the conventional Fischer-Tropsch synthesis reactor by using the common catalyst. By applying the method, the mass content of the LAOs in the reaction products is more than 70%, thus being very beneficial to separation and purification. Meanwhile, by applying the method, the CO conversion rate can be improved, the methane selectivity can be reduced and the yield of heavy hydrocarbons can be greatly increased.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis production method for producing linear alpha olefins (α-olefins), in particular to a solvent-phase Fischer-Tropsch synthesis method, especially a Fischer-Tropsch synthesis method using a polar solvent as a reaction medium. Background technique [0002] Linear α-olefins (LAOs) with different chain lengths have important industrial applications and are indispensable and important raw materials for the production of high-performance polyethylene products, high-grade lubricants, degradable detergents, and surfactants. [0003] The current main method for producing linear α-olefins is olefin oligomerization, which is too costly to produce linear α-olefins with an odd number of carbons that also have market value. The cost of Sasol to extract linear 1-hexene from the crude product of the Fischer-Tropsch Synthesis process is less than 40% of the cost of Philips' ethylene trimerization to produce 1-hexene, a...

AI Technical Summary

Problems solved by technology

However, the selection range of this supercritical fluid is very small, and the extraction capacity is limited. At the same time, the operating conditions of this process are harsh. Not only does it require high-pressure operation, but it increases the power consumption of the process compression. The conditions are difficult to control, so the prospect of industrialization is not clear (Document: Aiche, 2010, 56(4), 997-1015)

Images