Device and method for recovering paraffin from Fischer-Tropsch paraffin residues

Abstract

The invention belongs to the technical field of recovery from Fischer-Tropsch paraffin residues and particularly relates to a device and a method for recovering paraffin from the Fischer-Tropsch paraffin residues. The device comprises a pyrolysis furnace, a precipitator, a condensing device and a gas-liquid separator, wherein the pyrolysis furnace is connected with the precipitator which is connected with the condensing device, and the condensing device is connected with the gas-liquid separator which is connected with the pyrolysis furnace; an inner barrel and an outer barrel are arranged in the pyrolysis furnace, a boost screw is arranged in the inner barrel, and a flue is formed between the inner barrel and the outer barrel; the pyrolysis furnace is further provided with a nitrogen inlet and a residue discharge port. The device and the method have the advantages that the purpose of paraffin recovery is achieved through separation of the paraffin from catalyst residues, the effective constituent yield of the paraffin residues is higher than 82%, produced non-condensable gas returns to the hearth of the pyrolysis furnace for combustion, flue gas emission is reduced, and the method is a clean process for recovering the paraffin from the Fischer-Tropsch paraffin residues.

Description

technical field [0001] The invention belongs to the technical field of recovering waste dewaxing slag, and in particular relates to a device and a method for recovering paraffin from waste dewaxing slag. Background technique [0002] Using coal-based or natural gas-based synthesis gas as raw material, Fischer-Tropsch reaction occurs under the action of a catalyst, and liquid fuels and other chemical products mainly composed of paraffins can be synthesized. In order to maintain the reactivity of the Fischer-Tropsch catalyst, the waste catalyst will be regularly removed and replaced. At the same time, in the refining process of the synthetic liquid product heavy wax, the filter aid used will form a filter cake. The waste generated by these two processes The solid wax residue contains 30% to 50% paraffin, and the remaining components are spent catalysts. Usually, the method of treating Fischer-Tropsch wax slag is generally adopted to filter the paraffin separately under the co...

AI Technical Summary

Problems solved by technology

Usually, the method of treating Fischer-Tropsch wax slag is generally adopted under the condition of high temperature in its liquid state, to filter the paraffin respectively, gravity sedimentation, cyclone separation, membrane separation, etc., the separation effect is not good, and the requirements for equipment are relatively high. Harsh, needs further improvement

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