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A system for Fischer-Tropsch synthesis and method for preparing low-carbon olefins from synthesis gas

A technology of Fischer-Tropsch synthesis and gas-solid separator, which is applied in the chemical industry, can solve the problems of catalyst and heat exchanger collision contact, catalyst and heat exchanger are easily damaged, and increase catalyst cost, etc., and achieve easy regeneration, convenient loading and unloading, and high temperature Consistent and uniform effect

Active Publication Date: 2020-09-29
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Existing Fischer-Tropsch synthesis equipment all adopts heat exchangers to directly exchange heat with reaction raw materials and products, such as patent applications CN101396647A, CN102861539A, and CN1824378A. Causes both catalyst and heat exchanger to be easily damaged
Due to the violent movement of the catalyst particles inside the reactor, violent collisions occur when they come into contact with the heat exchange components, which may easily cause increased wear of the catalyst and increase the cost of the catalyst. At the same time, the heat exchanger components are constantly worn and prone to leakage
The heat exchanger components are inside the reactor, which needs to be shut down for maintenance regularly, which increases the operating cost in the later period

Method used

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  • A system for Fischer-Tropsch synthesis and method for preparing low-carbon olefins from synthesis gas
  • A system for Fischer-Tropsch synthesis and method for preparing low-carbon olefins from synthesis gas
  • A system for Fischer-Tropsch synthesis and method for preparing low-carbon olefins from synthesis gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Reactors for synthesis gas to light olefins such as figure 1 shown. The main active components of the catalyst are Fe and HZSM-5, the particle size distribution range is 10-200μm, the reaction temperature is 350°C, the pressure is 1.7MPa, H 2 The molar ratio to CO is 1:1, and the total volume space velocity of raw materials is 2000h -1 .

[0057] The reaction gas enters from the bottom inlet 3 of the cylinder body 1 of the fluidized bed reactor, and enters the catalyst bed after passing through the gas distributor 2. 2 react with CO to form H under the action of a catalyst 2 O and lower olefins. The gas-solid mixture enters the built-in cyclone separator 4 for gas-solid separation, and the oil gas flows out from the outlet 8 of the reactor.

[0058] The solid catalyst separated by the cyclone separator 4 flows out of the reactor, enters the delivery pipe 11, and cools down through the heat exchanger 5. The heat exchange medium in the external heat exchanger 5 enter...

Embodiment 2

[0061] Reactors for synthesis gas to light olefins such as figure 2 shown.

[0062] The main active components of the catalyst are Co and HZSM-5, the particle size distribution range is 40-120μm, the reaction temperature is 300°C, the pressure is 0.8MPa, the H 2 The molar ratio to CO is 2:1, and the total volume space velocity of the raw material is 800h -1 .

[0063] The reaction gas enters from the bottom inlet 3 of the cylinder body 1 of the fluidized bed reactor, and enters the catalyst bed after passing through the gas distributor 2. 2 react with CO to form H under the action of a catalyst 2 O and lower olefins. The gas-solid mixture enters the external cyclone separator 4 for gas-solid separation, and the gas exits the reactor from the cyclone separator 4. The gas-liquid mixture separated by the cyclone separator 4 is discharged from the reactor outlet 8, the solid catalyst separated by the cyclone separator 4 enters the delivery pipe 11, and is cooled by the exter...

Embodiment 3

[0066] Reactors for synthesis gas to light olefins such as figure 1 shown.

[0067] The main active components of the catalyst are Fe and Y-type molecular sieves, the particle size distribution range is 40-120μm, the reaction temperature is 380°C, the pressure is 2.0MPa, H 2 The molar ratio to CO is 2:1, and the total volume space velocity of raw materials is 2000h -1 .

[0068] The reaction gas enters from the bottom inlet 3, and enters the catalyst bed after passing through the gas distributor 2. 2 react with CO to form H under the action of a catalyst 2 O and lower olefins. The gas-solid mixture enters the built-in cyclone separator 4 for gas-solid separation, and the oil gas flows out from the outlet 8 of the reactor.

[0069] The solid catalyst separated by the cyclone separator 4 flows out of the external heat exchanger 5 of the reactor to cool down, and the cooled catalyst enters the reactor barrel 1 to cool down the reaction bed.

[0070] The external heat exchan...

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Abstract

The invention provides a system for Fischer-Tropsch synthesis, and a method for preparing low-carbon olefins from synthetic gas. The system for Fischer-Tropsch synthesis includes a fluidized bed reactor cylindrical shell, a gas-solid separator, a heat exchanger and a catalyst delivery tube; a product outlet is arranged at the top of the fluidized bed reactor cylindrical shell, and the product outlet is connected with the gas-solid separator; the gas-solid separator is provided with a solid product outlet, the solid product outlet is connected with one end of the catalyst delivery tube, and theother end of the catalyst delivery tube is connected with the bottom of the fluidized bed reactor cylindrical shell; and the heat exchanger is used to exchange heat with the delivery tube, and the heat exchanger and the delivery tube are arranged outside the fluidized bed reactor cylindrical shell. The system timely removes the reaction heat of a reactor, avoids the problems of abrasion of a catalyst and easy destruction of devices during heat removal, and recycles the removed heat.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a system for Fischer-Tropsch synthesis and a method for preparing low-carbon olefins from synthesis gas. Background technique [0002] Low-carbon olefins such as ethylene, propylene, and butene are important basic organic chemical raw materials. With the development of the chemical industry, their demand is increasing. So far, the way to produce low-carbon olefins such as ethylene and propylene is mainly through the cracking process of light oil. With the increasing depletion of petroleum resources worldwide, the future energy structure will inevitably shift. Compared with oil resources, coal and natural gas resources are relatively abundant, and it is of great significance to develop low-carbon olefin production processes based on coal and natural gas. The development of direct production of ethylene and propylene technology from syngas (which can be converted from na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/18B01J8/00C10G2/00
CPCB01J8/0035B01J8/0055B01J8/1836B01J8/1854C10G2/33C10G2300/4006C10G2300/4081
Inventor 张国良郝代军毛继平陈新宇秦毓辰江莉何文
Owner SINOPEC ENG GRP CO LTD
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