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Shunt down method of fixed bed Fischer-Tropsch synthesis process

A Fischer-Tropsch synthesis, fixed-bed technology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems of catalyst damage and difficult replacement of heavy hydrocarbons, and achieves reduction of temperature runaway, reduced temperature Adverse influence, effect of smooth shutdown

Active Publication Date: 2013-06-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a shutdown method for a fixed-bed Fischer-Tropsch synthesis process on the basis of the prior art. The technical problem to be solved is that the heavy hydrocarbons in the reaction tube are difficult to replace in the existing shutdown method, and the catalyst is damaged. And other issues

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] In this example, a tubular fixed-bed reactor is used, and cobalt loaded with metal oxide is used as a Fischer-Tropsch synthesis catalyst. The Fischer-Tropsch synthesis reaction conditions are: reaction pressure 3.0MPa, catalyst bed average temperature 215°C, H 2 The molar ratio of feed to CO and CO is 2, and the hourly space velocity of syngas is 750h -1 , The ratio of recycle gas to fresh feed gas (cycle ratio) is 4.

[0025] When the reactor needs to be shut down, keep the average temperature of the catalyst bed at 215°C, cut in nitrogen (oxygen volume fraction less than 0.5%), cut out the raw material gas, and keep the gas hourly space velocity at 750h -1 , the cycle ratio is kept at 4. After 12 hours of replacement, the liquid level of the high-pressure separator has no obvious change, and the combustible gas (H 2 +CO) volume fraction is less than 0.1%, the cycle compressor is stopped, and the liquid level of the high and low pressure separators drops to a low le...

Embodiment 2

[0027] In this embodiment, a tubular fixed-bed reactor is used, and cobalt loaded with metal oxide is used as a Fischer-Tropsch synthesis catalyst, and part of the light synthetic oil is recycled back to the reactor inlet. The Fischer-Tropsch synthesis reaction conditions are: reaction pressure 3.0MPa, catalyst bed average temperature 210°C, H 2 The molar ratio of feed to CO is 2, and the hourly space velocity of syngas is 700h -1 , The space velocity of light synthetic oil entering the reactor is 0.5h -1 , The ratio of recycle gas to fresh feed gas (cycle ratio) is 3.

[0028] When the reactor needs to be shut down, keep the average temperature of the catalyst bed at 210°C, cut in nitrogen (oxygen volume fraction less than 0.5%), cut out the raw material gas, and keep the gas hourly space velocity at 700h -1 , to maintain the space velocity of light synthetic oil entering the reactor at 0.5h -1 , the cycle ratio is kept at 3. Subtract 0.25h per hour after replacement for ...

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Abstract

The invention provides a shunt down method of a fixed bed Fischer-Tropsch synthesis process. The shunt down method comprises the following steps: when a device is shunted down after a fixed bed Fischer-Tropsch synthesis reaction is finished, firstly, maintaining the temperature of a catalyst bed layer to be unchanged; leading nitrogen from the inlet of a reactor, and simultaneously, cutting off raw material gas for feeding; maintaining the amount of a circulating gas to be unchanged; after replacing to the required condition, gradually reducing the pressure of a reactor, and then gradually reducing the temperature of the catalyst bed layer; and when the temperature of the bed layer is reduced to less than100 DEG C, gradually completing shunt down. Compared with the prior art, by using themethod in the invention, the side influence to the catalyst bed layer in the shunt down process is reduced while stable shunt down is achieved, thereby proving a good guarantee for subsequent reworking and catalyst unloading.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis process, more specifically, a shutdown method for a fixed-bed Fischer-Tropsch synthesis process. Background technique [0002] With the decrease of oil resources in the world, the development of alternative energy technology has become the focus of the world's major oil companies. Since the 1980s, especially since the 1990s, with the continuous improvement of environmental protection requirements, the fuel has become more and more clean, and the trend of heavy crude oil and high sulfuration in the world is very obvious, and the cost of producing clean fuel by conventional oil refining technology is increasing. The higher it is, the urgent need to develop new technologies to reduce the cost of producing clean fuels; at the same time, the contradiction between oil resource demand and reserves is becoming increasingly prominent, and it is inevitable to find new alternative fuel technologies. Since the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/04C10G2/00B01J8/06
Inventor 徐润胡志海吴昊李猛李大东聂红夏国富
Owner CHINA PETROLEUM & CHEM CORP
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