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A sulfur-resistant methanation process for producing natural gas from syngas

A technology for sulfur-resistant methanation and synthesis gas, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of intolerant sulfur, easy poisoning and inactivation, etc., achieves good isothermal resistance, wide sulfur resistance range, and shortens the process flow Effect

Active Publication Date: 2016-04-06
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing coal-to-natural gas process that the methanation catalyst is not resistant to sulfur and is easily poisoned and deactivated when encountering trace amounts of sulfur, the purpose of the present invention is to provide a suitable catalyst with high energy utilization rate, low equipment investment and operating costs, and easy operation. Sulfur-tolerant methanation process for synthesis gas to natural gas

Method used

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  • A sulfur-resistant methanation process for producing natural gas from syngas

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Preparation of catalyst for sulfur-tolerant methanation of syngas in slurry bed:

[0047] 60-80 mesh, specific surface area 150m 2 / g γ-Al 2 o 3 Calcined at 400°C for 4h, at a temperature of 25°C and a stirring speed of 100r / min, the Mo(NO 3 ) 3 ·5H 2 O, Ni(NO 3 ) 2 ·6H 2 O, γ-Al 2 o 3 According to the mass percentage of Mo: Ni: Al 25%: 15%: 60%, impregnate with equal volume and stir for 8 hours, after standing for 4 hours, evaporate to viscous at 60°C, then put it in an oven to dry at 80°C for 12 hours, and then grind to 60-80 mesh Place in a muffle furnace and bake at 450°C for 4h to obtain a precursor; the volume composition is 15%H 2 and 85%N 2 , in an atmosphere with a flow rate of 80mL / min, using a two-stage temperature program, first raising the temperature to 350°C at 4°C / min, and then raising the temperature to 500°C at 2°C / min for 6 hours to obtain Mo:Ni:Al mass percentage 25% : 15%: 60% Mo-Ni-Al slurry bed synthesis gas sulfur resistant methanatio...

Embodiment 2

[0054] Preparation of catalyst for sulfur-tolerant methanation of syngas in slurry bed:

[0055] 80-100 mesh, specific surface area 200m 2 / g γ-Al 2 o 3 Calcined at 450°C for 5h, at a temperature of 30°C and a stirring speed of 200r / min, the Mo(NO 3 ) 3 ·5H 2 O, W (NO 3 ) 3 ·5H 2 O, Ni(NO 3 ) 2 ·6H 2 O, γ-Al 2 o 3 According to the mass percentage of Mo:W:Ni:Al 25%: 10%: 20%: 45% equal volume impregnation and stirring for 10h, after standing for 5h, evaporate at 70°C to viscous, then put it in an oven for 100°C to dry for 12h, then grind To 80-100 mesh, place in a muffle furnace and bake at 500 ° C for 6 hours to obtain a precursor; the volume composition is 20% H 2 and 80%N 2 , in an atmosphere with a flow rate of 100mL / min, two-stage temperature programming is adopted, firstly the temperature is raised to 350°C at 6°C / min, and then the temperature is raised to 550°C at 3°C / min for constant temperature reduction for 6 hours to obtain the mass of Mo:W:Ni:Al Perce...

Embodiment 3

[0062] Preparation of catalyst for sulfur-tolerant methanation of syngas in slurry bed:

[0063] 120-140 mesh, specific surface area 240m 2 / g SiO 2 Calcined at 500°C for 6h, at a temperature of 50°C and a stirring speed of 240r / min, the Mo(NO 3 ) 3 ·5H 2 O, Ce 2 (SO 4 ) 3 ·8H 2 O, Ni(NO 3 ) 2 ·6H 2 O, SiO 2 According to the mass percentage of Mo: Ce: Ni: Si 15%: 15%: 30%: 40% equal volume impregnation and stirring for 24 hours, after standing for 8 hours, evaporate at 90°C until viscous, then put it in an oven for 24 hours at 130°C, and then grind To 120-140 mesh, place in a muffle furnace and bake at 600 ° C for 5 hours to obtain a precursor; the volume composition is 25% H 2 and 75%N 2 , in an atmosphere with a flow rate of 180mL / min, using a two-stage temperature program, first raising the temperature to 350°C at 8°C / min, and then raising the temperature to 600°C at 3°C / min for 10 hours to obtain the mass of Mo:Ce:Ni:Si Percentages 15%: 15%: 30%: 40% Mo-Ce-Ni...

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Abstract

The invention provides a sulfur-tolerant methanation process for preparing natural gases from synthesis gases. The sulfur-tolerant methanation process comprises the steps that after hydrogen is replenished to the synthesis gases to form feed gases, the feed gases are compressed, a part of the feed gases enter a sulfur-tolerant slurry bed reactor from the bottom of a slurry bed reactor containing an inert medium and a sulfur-tolerant methanation catalyst to undergo methanation reaction, the product gases are exhausted from the top of the slurry bed reactor and enter a gas-liquid-solid separator, the liquid and solid phases are discharged from the bottom of the separator and flow back to the slurry bed reactor, the gas phase is discharged from the top of the separator, the separated gas phase and the other part of the feed gases flowing along the lateral line enter a fixed bed sulfur-tolerant methanation reactor from the bottom of a fixed bed containing a sulfur-tolerant catalyst to undergo sulfur-tolerant methanation, the product gases are exhausted from the top and undergo heat exchange in a heat recovery device and the qualified natural gas products are obtained through purification. The sulfur-tolerant methanation process has the advantages of high energy utilization rate, low equipment investment and operating cost and easiness in operation.

Description

technical field [0001] The invention belongs to a process for synthesizing natural gas, in particular to a process for producing synthetic natural gas through sulfur-resistant methanation of coal-based syngas. Background technique [0002] Coal, oil and natural gas are the three pillars of the world's energy structure. Natural gas is a clean and efficient energy resource. It is widely used in power generation, chemical industry, city gas, automobile fuel and other industries. In the current world energy consumption structure, natural gas accounts for 24%, while the proportion of natural gas in my country is less than 5%, which is far lower than the world average. There is an urgent need to increase the consumption of natural gas. On the other hand, my country is rich in coal resources, but they are mainly concentrated in remote areas in the central and western regions, while energy consumption is mainly concentrated in the central and eastern regions. Coal transportation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 张庆庚李晓崔晓曦曹会博范辉牛凤芹
Owner SEDIN ENG
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