A kind of separation method of slurry bed Fischer-Tropsch synthesis heavy product and catalyst

Abstract

A separation method for a slurry bed fischer-tropsch synthesis heavy product and a catalyst is characterized in that the fischer-tropsch synthesis heavy product from a slurry bed reactor and the magnetic fischer-tropsch synthesis catalyst, after degassing, enter the lower part of a separator, the catalyst and the fischer-tropsch synthesis heavy product are preliminarily separated by gravity settling to obtain concentrated slurry rich in the catalyst in the lower part of the separator, the concentrated slurry is cycled to the slurry bed reactor, and obtained diluted slurry enters into a magnetic separator zone on the upper part of the separator; in the magnetic separator zone, the catalyst is adsorbed by magnetic force in a magnetic field zone, when the amount of the catalyst adsorbed in the magnetic field zone reaches a set amount, the magnetic field is removed, the catalyst sinks by gravity to a flow guide pipe, flows to the bottom of the separator along the flow guide pipe, and is is cycled to the slurry bed reactor; after the magnetic separation, the catalyst is further separated from the fischer-tropsch synthesis heavy product containing less catalyst by a filter element, and is discharged out of the separator, and the filtered catalyst is cycled to the slurry bed reactor.

Description

technical field

[0001] The invention relates to a method for separating a catalyst for preparing hydrocarbons from synthesis gas and a heavy product, in particular to a method for separating a heavy product and a catalyst for a slurry bed Fischer-Tropsch synthesis. Background technique

[0002] With the changes in the world's energy structure and the increasing global environmental protection requirements, the method of preparing synthetic oil through Fischer-Tropsch synthesis using natural gas and coal-based syngas as raw materials has the advantages of clean products, no sulfur, nitrogen, and aromatic hydrocarbons, etc. In recent years, it has attracted the attention of countries all over the world.

[0003] The core of Fischer-Tropsch synthesis technology is catalyst and reactor technology. Currently, Fischer-Tropsch synthesis catalysts mainly include cobalt catalysts and iron catalysts. In terms of reactors, the Fischer-Tropsch synthesis slurry bed reactor has the char...

Examples

Embodiment 1-4

[0028] Embodiment 1-4 flow process is as figure 1 As shown, the structure of the sedimentation / magnetic separator used is as follows figure 2 As shown, the inner diameter of the sedimentation / magnetic separator is 0.6 meters, and two sets of electromagnets are used to achieve magnetic separation. The rinse interval is 30 minutes. The catalyst used is an alumina-supported cobalt-based Fischer-Tropsch synthesis catalyst with a cobalt content of 20% (mass) and an average particle size of 50 microns. The catalyst concentration in the catalyst slurry drawn from the reactor is 26% (mass). From bottom to top, the first electromagnet has a power-on time of 100 seconds and a power-off time of 10 seconds. The power-on time and power-off time are alternately performed; Carry out; the operation mode of the upper and lower electromagnets is: when the lower electromagnet is energized, the upper layer is powered off, and when the lower layer is powered off, the upper layer is powered on. ...

Embodiment 5-7

[0032] Embodiment 5-7 process such as figure 1 As shown, the structure of the sedimentation / magnetic separator used is as follows figure 2 As shown, the inner diameter of the sedimentation / magnetic separator is 0.6 meters, and two sets of electromagnets are used to realize the magnetic separation. The rinse interval is 30 minutes. The catalyst used is a Raney iron catalyst with an iron content of 75% (mass) and an average particle size of 45 microns. The catalyst concentration in the catalyst slurry drawn from the reactor is 32% (mass). From bottom to top, the first electromagnet has a power-on time of 60 seconds and a power-off time of 10 seconds. The power-on time and power-off time are alternately performed; Carry out; the operation mode of the upper and lower electromagnets is: when the lower electromagnet is de-energized, the upper electromagnet is energized. See Table 2 for the slurry treatment capacity and the solid content in the liquid after separation.

[0033] ...

technical field

[0001] The invention relates to a method for separating a catalyst for preparing hydrocarbons from synthesis gas and a heavy product, in particular to a method for separating a heavy product and a catalyst for a slurry bed Fischer-Tropsch synthesis. Background technique

[0002] With the changes in the world's energy structure and the increasing global environmental protection requirements, the method of preparing synthetic oil through Fischer-Tropsch synthesis using natural gas and coal-based syngas as raw materials has the advantages of clean products, no sulfur, nitrogen, and aromatic hydrocarbons, etc. In recent years, it has attracted the attention of countries all over the world.

[0003] The core of Fischer-Tropsch synthesis technology is catalyst and reactor technology. Currently, Fischer-Tropsch synthesis catalysts mainly include cobalt catalysts and iron catalysts. In terms of reactors, the Fischer-Tropsch synthesis slurry bed reactor has the char...

Examples

Embodiment 1-4

[0028] Embodiment 1-4 flow process is as figure 1 As shown, the structure of the sedimentation / magnetic separator used is as follows figure 2 As shown, the inner diameter of the sedimentation / magnetic separator is 0.6 meters, and two sets of electromagnets are used to achieve magnetic separation. The rinse interval is 30 minutes. The catalyst used is an alumina-supported cobalt-based Fischer-Tropsch synthesis catalyst with a cobalt content of 20% (mass) and an average particle size of 50 microns. The catalyst concentration in the catalyst slurry drawn from the reactor is 26% (mass). From bottom to top, the first electromagnet has a power-on time of 100 seconds and a power-off time of 10 seconds. The power-on time and power-off time are alternately performed; Carry out; the operation mode of the upper and lower electromagnets is: when the lower electromagnet is energized, the upper layer is powered off, and when the lower layer is powered off, the upper layer is powered on. ...

Embodiment 5-7

[0032] Embodiment 5-7 process such as figure 1 As shown, the structure of the sedimentation / magnetic separator used is as follows figure 2 As shown, the inner diameter of the sedimentation / magnetic separator is 0.6 meters, and two sets of electromagnets are used to realize the magnetic separation. The rinse interval is 30 minutes. The catalyst used is a Raney iron catalyst with an iron content of 75% (mass) and an average particle size of 45 microns. The catalyst concentration in the catalyst slurry drawn from the reactor is 32% (mass). From bottom to top, the first electromagnet has a power-on time of 60 seconds and a power-off time of 10 seconds. The power-on time and power-off time are alternately performed; Carry out; the operation mode of the upper and lower electromagnets is: when the lower electromagnet is de-energized, the upper electromagnet is energized. See Table 2 for the slurry treatment capacity and the solid content in the liquid after separation.

[0033] ...

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