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Fischer-Tropsch synthesis process based on fixed bed reactor

A fixed bed reactor, Fischer-Tropsch synthesis technology, applied in the petroleum industry, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc., can solve the problem of low reactor utilization, unclear fuel injection effect, and large fuel injection power consumption and other problems, to achieve the effect of high product yield, high selectivity, and large operating space velocity

Active Publication Date: 2014-04-02
中科潞安能源技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature Catalysis Today79-80 (2003) 495-501, Catalysis Today105 (2005) 357-361, Chemical Engineering Science58 (2003) 583-591 and Applied Catalysis A: General283 (2005) 39-46, etc. made a fixed bed packing monolith Catalyst and oil circulation experiment, although it has a certain effect on the temperature control of the bed, but the utilization rate of the reactor is low, and the production capacity is not up to the requirement
Chinese patent CN101275080A also publicly introduces the fixed-bed Fischer-Tropsch synthetic oil circulation process, but the concept of fixed-bed oil circulation in the existing process is relatively vague, the fuel injection components are relatively broad, the power consumption of fuel injection is large, and the effect of fuel injection is not good. clear

Method used

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  • Fischer-Tropsch synthesis process based on fixed bed reactor
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  • Fischer-Tropsch synthesis process based on fixed bed reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare Co-Mn / ZrO according to the method described in patent CN1398669 2 Catalyst, according to final catalyst composition, preparation concentration is 0.8mol / L Co(NO 3 ) 2 ·6H 2 O, ZrOCl 2 and Mn(NO 3 ) 2 1L of the mixed solution, the preparation concentration is 0.2mol / L Na 2 CO 3Solution 1L, under continuous heating and stirring, drop the above two solutions into the beaker for precipitation at the same time, the precipitation temperature is 70°C, the precipitation pH value is 7.0, after the precipitation is completed, it is aged at 80°C for 2h, and washed repeatedly until there is no Cl ion. The filter cake was dried at 110°C for 12h, then calcined in a muffle furnace at 450°C for 2h to prepare the catalyst, and pressed into tablets. The atomic ratio of the catalyst is Co:Mn:Zr=20:0.5:79.5.

[0031] Take 100ml of the catalyst of 20-40 mesh and install it in a fixed bed reactor with an inner diameter of 14mm and a bed height of about 900mm. The upper 1 / 3 s...

Embodiment 2

[0035] Prepare Co-Ru / Al according to the method described in patent CN102962066A 2 o 3 Catalyst: Prepare a certain amount of 1mol / L aluminum sulfate aqueous solution, drop 10ml of NaOH, keep the temperature of the water bath at 40°C, keep the time for 180min, and weigh RuCl according to the ruthenium oxide accounting for 0.1(wt)% of the final catalyst 3 ·3H 2 O was added to the solution, peptizer H was added 2 SO 4 , stirred and refluxed at a microwave power of 50W until a transparent sol was maintained for 6h, and then aged at room temperature for 24h to obtain a gel. After drying at 50°C for 2 hours, place it in a microwave oven, heat up to 550°C for 12 hours at 2°C / min, and bake for 12 hours to prepare a catalyst carrier. Weigh Co(NO 3 ) 2 ·6H 2 O, an equal volume is impregnated on the above-mentioned carrier, dried at 120°C for 24h, and finally calcined at 450°C for 10h to prepare the catalyst and pressed into tablets. The atomic ratio of the catalyst is Co:Ru:Al=2...

Embodiment 3

[0040] Prepare the catalyst according to the method described in patent CN101269336: use polystyrene spheres as templates, add 18ml of styrene, 2ml of methacrylic acid and 0.2g of potassium persulfate into the container, then add 160ml of deionized water, and heat at 80°C for 24h. Cool to room temperature, centrifuge, wash to obtain gelatinous polystyrene balls, and dry at 60°C for 24h. According to the composition of the catalyst, add a certain amount of methyl orthosilicate into the hydrochloric acid solution and stir for 15 minutes. During this process, the temperature first rises from room temperature to 60°C and then drops to 30°C. Then pour the solution into the solution containing surfactant Stir in the solution of P123 and butanol for 5 min. The molar composition of each substance in the solution is P123:H 2 O:BuOH:HCl:TMOS=0.005:6.47:0.335:0.01625:1. Finally, polystyrene balls were added to the silica sol (polystyrene balls / polystyrene balls+solution=15(wt)%), and s...

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Abstract

The invention discloses a Fischer-Tropsch synthesis process based on a fixed bed reactor. The Fischer-Tropsch synthesis process comprises the steps of dividing a bed layer into an upper section, a middle section and a lower section, filling a diluted catalyst; performing Fischer-Tropsch synthesis reaction on a preheated raw material gas formed by mixing fresh synthesis gas and a recycle gas and a recycle medium in a catalyst bed layer, performing oil-gas-water three-phase separation on reaction products, performing waste water treatment on synthesis water obtained through separation, wherein one part of the gas obtained through separation is purge gas and one part of the gas is recycled; and separating liquid obtained through separation, wherein one part of intermediate fractions C10-C22 obtained through separation is used as a recycle medium and the left imtermediate fractions C10-C22 is used as other application. The Fischer-Tropsch synthesis process has the advantages of high yield, uniformity in temperatures of the bed layer, no heat spot, and stability in operation, and is easy to control.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis process based on a fixed-bed reactor. Background technique [0002] Fischer-Tropsch synthesis refers to the process of converting coal, natural gas or biomass into hydrocarbons through synthesis gas under the action of a catalyst. Through this process, many clean fuels and chemicals such as gasoline, diesel oil, wax, naphtha, and light olefins can be obtained. Today, fluidized bed, slurry bed and fixed bed reactors are the main reactors for Fischer-Tropsch synthesis reactions. The fixed bed reactor has the advantages of small catalyst wear, small loading, stable activity, suitable for high temperature and high pressure operation, etc., and is often used in Fischer-Tropsch synthesis process. However, fixed-bed reactors also have the problems of uneven bed temperature distribution and poor bed thermal conductivity, which lead to prominent hot spots of Fischer-Tropsch synthesis reaction, low efficienc...

Claims

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Application Information

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IPC IPC(8): B01J8/04C10G2/00
Inventor 李德宝李晋平侯博贾丽涛肖亚宁刘斌黄巍孙志强
Owner 中科潞安能源技术有限公司
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