Solid-liquid separation method for Fischer-Tropsch synthetic wax

Abstract

The invention relates to the field of Fischer-Tropsch synthesis wax filtration, and discloses a solid-liquid separation method for Fischer-Tropsch synthetic wax. The method comprises the steps of: (1)feeding raw material wax obtained by Fischer-Tropsch synthesis into a filter, and carrying out solid-liquid separation to obtain qualified wax with an iron content of not more than 10ppm; and (2) when the pressure difference between the inlet pressure and the outlet pressure of the filter reaches 0.6MPa or above, stopping feeding of the raw material wax, and conducting slag removal on the filter.The slag removal process comprises the steps of (2-1) emptying the raw material wax in the filter; (2-2) introducing inert gas into the emptied filter for back flushing; and (2-3) introducing the qualified wax into the filter for washing. The steps (1) and (2) are repeated, and the content of iron in the raw material wax is 10-1000ppm. The method is low in operation cost and good in filtering effect.

Description

technical field [0001] The invention relates to the field of filtration of Fischer-Tropsch synthetic wax, in particular to a method for solid-liquid separation of Fischer-Tropsch synthetic wax. Background technique [0002] Large-scale Fischer-Tropsch synthesis processes at home and abroad basically use slurry bed reactors. Slurry bed reactors have good reaction heat transfer performance, can be operated isothermally, and can load and unload catalysts online. The processing capacity of a single reactor is high. A large amount of heavy wax generated by the Fischer-Tropsch reaction is discharged through the built-in wax filter tube of the reactor, and then sent to the wax filter device for filtration. The purpose is to minimize the iron content entrained in the heavy wax, so as to avoid the long-term stable operation of downstream devices. [0003] Usually, the wax filtration device adopts a vertical leaf disc filter, in which the filter discs are all installed horizontally on...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of high maintenance frequency, large loss of spare parts, and high consumption of additives in the prior art, as well as the problems of poor filtering effect caused by low filtration precision and small processing capacity, and provide a cost-effective A method for solid-liquid separation of torpedo synthetic wax, which has low operating cost and good filtering effect

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