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Tropsch synthesis method of fixed bed

A technology of Fischer-Tropsch synthesis and fixed bed, which is applied in the preparation of liquid hydrocarbon mixtures, organic chemistry, and hydrocarbon production from carbon oxides. It can solve the problems of easy reaction hot spots, excessive bed temperature difference, and difficulty in controlling the temperature of the catalyst bed. and other problems, to achieve the effect of reducing reaction hot spots, increasing yield, and improving mass and heat transfer performance

Active Publication Date: 2013-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the temperature control of the fixed bed Fischer-Tropsch synthesis catalyst bed is difficult, and the resulting bed temperature difference is too large, which is easy to produce the problem of reaction hot spots

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment adopts cobalt-based Fischer-Tropsch synthesis catalyst, figure 1 in the process flow. The catalyst adopts a conventional preparation method, and the solution containing cobalt nitrate is impregnated on the alumina carrier, and the catalyst is obtained after drying and roasting. The content of metal cobalt in the finished catalyst is 20%, and the addition amount of noble metal additive Pd is 0.1%. The catalyst is filled in each reaction tube, and the pressure drop of each reaction tube is as close as possible. Before the introduction of syngas, the catalyst needs to pass through H 2 Reduction, reduction reaction conditions: the pressure is 0.5MPa, and the reaction temperature is 400°C. After reduction, it is lowered to 150°C to introduce fresh raw material synthesis gas. H of purified raw syngas 2 The / CO ratio was 2.0.

[0040] The fresh raw material synthesis gas enters the fixed-bed Fischer-Tropsch synthesis reactor, and carries out the Fischer-T...

Embodiment 2

[0048] This embodiment adopts iron-based Fischer-Tropsch synthesis catalyst, figure 2 in the process flow. The catalyst is prepared by the precipitation method, and the main components are Fe, Cu, alkaline earth metals, K and SiO 2 , The catalyst weight composition is 100Fe:5Cu:5K:25SiO2. The catalyst needs to be reduced by syngas before introducing the raw material synthesis gas. Reduction reaction conditions: the pressure is 0.5MPa, and the reaction temperature is 300°C. After reduction, it is lowered to 150°C to introduce fresh raw material synthesis gas. H of purified raw syngas 2 The / CO ratio was 1.5.

[0049] The fresh raw material synthesis gas enters the fixed-bed Fischer-Tropsch synthesis reactor, and carries out the Fischer-Tropsch synthesis reaction under the action of an iron-based Fischer-Tropsch synthesis catalyst, and the reaction effluent is separated to obtain gaseous hydrocarbon products, liquid hydrocarbon products and water; The liquid hydrocarbon pr...

Embodiment 3

[0057] This embodiment adopts cobalt-based Fischer-Tropsch synthesis catalyst, figure 1 in the process flow. The catalyst adopts a conventional preparation method, impregnating a solution containing cobalt nitrate and zirconium nitrate on a silica carrier, drying and calcining to obtain the catalyst. The content of metal cobalt in the finished catalyst is 22%, and the addition amount of auxiliary agent zirconium is 2.5%. The catalyst is filled in each reaction tube, and the pressure drop of each reaction tube is as close as possible. Before the introduction of syngas, the catalyst needs to pass through H 2 Reduction, reduction reaction conditions: the pressure is 0.5MPa, and the reaction temperature is 400°C. After reduction, it is lowered to 150°C to introduce fresh raw material synthesis gas. H of purified raw syngas 2 The / CO ratio was 2.0.

[0058] The fresh raw material synthesis gas enters the fixed-bed Fischer-Tropsch synthesis reactor, and the Fischer-Tropsch syn...

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Abstract

The invention relates to a tropsch synthesis method of a fixed bed, which is one-section tropsch synthesis, and comprises the steps of: leading fresh raw material gas H2 and CO to enter a tropsch synthesis reactor of the fixed bed, carrying out tropsch synthesis reaction under the action of tropsch synthesis catalyst, separating the reaction effluent, and obtaining gas hydrocarbon product, liquidhydrocarbon product and water, wherein the liquid hydrocarbon product is separated into light fraction oil, intermediate fraction oil and heavy fraction oil; and returning part of the gas hydrocarbonproduct and the liquid hydrocarbon product back to an inlet of the tropsch synthesis reactor. The invention solves the problems of difficult temperature control of a bed layer of the tropsch synthesis catalyst of the fixed bed, overhigh temperature of the bed layer and poor product selectivity. The invention improves the distribution of the synthetic oil product, and effectively reduces the olefin content of the light synthetic oil product.

Description

technical field [0001] The invention relates to a method for producing liquid hydrocarbons through Fischer-Tropsch synthesis using synthetic gas as a raw material, in particular to a fixed-bed Fischer-Tropsch synthesis method. Background technique [0002] With the development of the world economy, the demand for refined oil has increased rapidly, while the reserves and production of oil resources have gradually decreased and become inferior. The contradiction between demand and reserves has become increasingly prominent. At the same time, the requirements of international and domestic environmental protection regulations have become increasingly Therefore, obtaining high-quality liquid fuel products through new methods is a major problem facing China and the world. Clean fuels (especially high-quality diesel) and other high value-added chemicals can be produced on a large scale through Fischer-Tropsch (F-T) synthesis. The raw material synthesis gas (CO and H 2 ) has a wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/04C10G2/00C07C9/04
Inventor 徐润胡志海吴昊田鹏程李大东聂红夏国富
Owner CHINA PETROLEUM & CHEM CORP
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