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Fischer-Tropsch synthesis method for fixed bed

A technology of Fischer-Tropsch synthesis and fixed bed, which is applied in the preparation of liquid hydrocarbon mixtures, the petroleum industry, and the production of hydrocarbons from carbon oxides, etc. It can solve the problems of poor product selectivity, difficulty in controlling the temperature of the catalyst bed, and excessive bed temperature difference, etc. problems, to achieve the effects of small temperature difference between the axial phases, high selectivity and increased yield

Active Publication Date: 2010-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] 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, the resulting bed temperature difference is too large, and the problem of poor product selectivity

Method used

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  • Fischer-Tropsch synthesis method for fixed bed
  • Fischer-Tropsch synthesis method for fixed bed
  • Fischer-Tropsch synthesis method for fixed bed

Examples

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preparation example Construction

[0033] The preparation process of the Fischer-Tropsch synthesis catalyst used in the embodiment is as follows:

[0034] Take alumina powder (Shandong Aluminum Factory), add distilled water dropwise to incipient wetness, record the volume of consumed water, and then calculate based on the Co content of 27% by weight to prepare a cobalt nitrate impregnation solution. Then impregnate alumina with this solution to incipient wetness, let it stand for 8 hours, then dry it at 120°C for 4 hours, and bake it in a muffle furnace at 450°C for 4 hours to obtain catalyst A.

Embodiment 1

[0036] Adopt the method described in the present invention to carry out Fischer-Tropsch synthesis reaction on the fixed-bed Fischer-Tropsch synthesis reactor, the catalyst adopts cobalt-based catalyst A, and the catalyst is first reduced in a pure hydrogen atmosphere at 400°C for 24h, and then feeds synthesis gas to carry out Fischer-Tropsch synthesis reaction, synthesis reaction conditions are: reaction pressure 3.0MPa, H 2 / CO feed molar ratio 2, gas hourly space velocity 750h -1 , Cycle ratio 4. After the light distillate oil is collected for a period of time, the light distillate oil at <200°C is returned to the inlet of the Fischer-Tropsch synthesis reactor at a flow rate of 90g / h, and the temperature at the inlet of the Fischer-Tropsch synthesis reactor is 185°C. After the temperature of the catalyst bed and the reaction effect are stabilized, the data are collected for result calculation. The temperature distribution and test results of the catalyst bed are shown in T...

Embodiment 2

[0039] On the basis of Example 1, the <200°C light distillate oil is returned to the Fischer-Tropsch synthesis reactor inlet at a flow rate of 120g / h, and the operating temperature is adjusted so that the average temperature of the catalyst bed is close to that of Example 1, and the remaining conditions are the same as in Example 1. 1. The temperature distribution and test results of the catalyst bed are shown in Table 2.

[0040] As can be seen from Table 2, the bed temperature of the reactor is more uniform, the axial temperature difference of the bed is small, only 5.1°C; the C5+ liquid selectivity is high, 81.62mol%; the middle distillate yield is high, 39.60% by weight.

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Abstract

The invention discloses a Fischer-Tropsch synthesis method for a fixed bed, which comprises the following steps: leading fresh feed gases, namely H2 and CO, into a fixed bed Fischer-Tropsch synthesis reactor, performing Fischer-Tropsch synthesis reaction under the action of a Fischer-Tropsch synthesis catalyst, and after separating an effluent discharged from the reactor, obtaining a gas, a lightdistillate, a middle distillate, wax and water; partially circulating the obtained gas into the Fischer-Tropsch synthesis reactor to further participate in the Fischer-Tropsch synthesis reaction; andpartially returning the obtained light distillate into an inlet of the Fischer-Tropsch synthesis reactor. The method solves the problems of difficult temperature control of a Fischer-Tropsch synthesis catalyst bed layer, overlarge temperature difference caused by the difficult temperature control, and poor selectivity of the product. Because the temperature of the catalyst bed layer is uniformly distributed, the whole activity of the catalyst is brought into full play; the selectivity of C5+liquid hydrocarbon is high; and the yield of middle distillate oil is improved.

Description

technical field [0001] The invention relates to a method for producing liquid hydrocarbons through Fischer-Tropsch synthesis using synthesis gas as a raw material, in particular to a fixed-bed Fischer-Tropsch synthesis method. Background technique [0002] Synthesis gas (H 2 and CO), and then use syngas as raw material to produce liquid hydrocarbons through Fischer-Tropsch synthesis, which is a good alternative to petroleum technology. The product oil is mainly composed of straight chain hydrocarbons, among which, after hydrogenation and upgrading, the sulfur content of the middle distillate oil is less than 3μg / g, the nitrogen content is less than 0.5μg / g, and the cetane number is above 74, which can meet the current requirements. There are the most stringent diesel standards. In view of the current demand for oil products, middle distillates are one of the target products pursued by Fischer-Tropsch synthesis technology. [0003] Fischer-Tropsch Synthesis is a reaction t...

Claims

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Application Information

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IPC IPC(8): C07C1/04C10G2/00
Inventor 吴昊胡志海聂红夏国富徐润侯朝鹏田鹏程
Owner CHINA PETROLEUM & CHEM CORP
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