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Methanation method of oxygen-containing raw material

A technology of oxygen-containing raw materials and methanation, which is applied in the field of methanation, can solve the problems of short continuous operation period of catalysts, decreased activity of methanation catalysts, and rapid activity, and achieve the effect of avoiding reduction activation or replacement of methanation catalysts

Inactive Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the problems that the methanation catalyst activity decreases or even sinters when the methanation method is carried out in the prior art, frequent reduction activation or replacement of the methanation catalyst is required, so that the continuous operation period of the catalyst is not long, etc. Methanation Process for Treating Oxygenated Feedstock
[0014] The above-mentioned methanation method provided by the present invention can effectively solve the problem of rapid and significant decline in activity or sintering deactivation of methanation catalysts in the prior art in the methanation process of catalyzing oxygen-containing raw materials, thereby avoiding frequent reduction in industrial production Drawbacks of Activating or Replacing Methanation Catalysts

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specific Embodiment approach

[0050] According to another preferred embodiment of the present invention, specifically:

[0051] introducing a part of the oxygen-containing raw material into a deoxygenation reactor containing a deoxygenation catalyst for deoxygenation treatment; then introducing the reactant stream obtained through the deoxygenation reactor and the remaining part of the oxygen-containing raw material into the methanation reactor containing a methanation catalyst The methanation reaction is carried out, wherein the reaction conditions of the deoxygenation reactor are controlled so that the oxygen content in the reactant stream obtained through the deoxygenation reactor is 5.5-1000ppm.

[0052] The method of the present invention has good flexibility. When the oxygen content in the raw material to be methanated is lower than 5ppm, the raw material to be methanated can be directly introduced into the methanation reaction zone through a pipeline to carry out methane and when the oxygen content ...

Embodiment 1

[0061] Methanation Feedstock Composition: H 2 95mol%, CH 4 4.5mol%, CO 0.4mol%, O 2 0.1 mol%.

[0062] It is carried out on a small laboratory test device with a reactor inner diameter of 25 mm. The reactor is heated in two stages. The loading amount of the deoxidation catalyst in the deoxidation reactor is 40 mL. The catalyst model is the BC-DE catalyst produced by Sinopec Beijing Research Institute of Chemical Industry; methane The loading amount of the methanation catalyst in the methanation reactor is 30mL, and the catalyst model is BC-H-10 low-temperature methanation catalyst produced by Sinopec Beijing Research Institute of Chemical Industry. The raw materials are heated into the deoxidation reactor at a reaction temperature of 90°C, a reaction pressure of 1.0MPa, and a volumetric space velocity of 6000NM 3 / NM 3The reaction is carried out under the condition of h; the online analysis of the reacted material has an oxygen content of 11ppm, and then the reactant flows...

Embodiment 2

[0064] Methanation Feedstock Composition: H 2 90mol%, CH 4 5mol%, CO 1.4mol%, CO 2 0.1mol%, O 2 0.8mol%, N 2 0.1mol%, C 2 -C 3 It is 2.9 mol%.

[0065] Preparation of deoxidation catalyst: Weigh 0.21g of sponge Pd, dissolve it with aqua regia, and dilute it into 150mL of aqueous solution. Use ammonia water to adjust the pH value between 7-8 to prepare the dipping solution. Weigh 260g of Ф5 tooth spherical γ-Al 2 o 3 Put the carrier into the impregnating solution, shake the beaker until all the impregnating solution is loaded on the alumina carrier. Then the obtained catalyst precursor was dried at 120 °C for 3 hours. Baking at 450° C. for 3 hours in an air atmosphere. A deoxidation catalyst having a Pd content of the catalyst of 0.08% by weight was prepared.

[0066] The preparation of methanation catalyst: nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O] and 4.1 g of 50% by weight manganese nitrate [Mn(NO 3 ) 2 ] with 30.8g of citric acid [C 6 h 8 o 7 ·H 2 O] miscibi...

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Abstract

The invention relates to the field of methanation, and discloses a methanation method of an oxygen-containing raw material. The method is enforced in a system comprising a deoxidation reaction zone and a methanation reaction zone. The method comprises the following steps: introducing at least parts of the oxygen-containing raw material into the deoxidation reaction zone containing a deoxidation catalyst, and carrying out deoxidation treatment; and introducing reaction material flow obtained in the deoxidation reaction zone and the remaining oxygen-containing raw material to the methanation reaction zone containing a methanation catalyst, and carrying out a methanation reaction, wherein the reaction conditions of the deoxidation reaction zone are controlled to make the oxygen content of the reaction material flow obtained in the deoxidation reaction zone reach 5.5-1000 ppm. The methanation method effectively solves the problem of fast and substantial activity reduction or sintering deactivation of the methanation catalyst in the catalytic methanation process of the oxygen-containing raw material in order to prevent the defect of frequent reduction activation or replacement of the methanation catalyst in industrial production.

Description

technical field [0001] The invention relates to the field of methanation, in particular to a method for methanation of oxygen-containing raw materials. Background technique [0002] The methanation reaction is the simplest Fischer-Tropsch synthesis reaction. The reaction equation is: [0003] [0004] [0005] The two main application fields of methanation reaction are as high-concentration CO hydrogenation conversion, and the second is the removal of carbon oxides in hydrogen-rich raw materials. The role of the former is to convert syngas or various CO and H rich 2 The raw material is converted into city gas or substitute natural gas with higher calorific value per unit volume, safer and more stable, with methane as the main component through methanation reaction; the role of the latter is to purify various process gases rich in hydrogen, such as in ethylene It is used in the plant and ammonia synthesis plant to provide qualified hydrogen source. The source of hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00
Inventor 王秀玲郝雪松徐洋周丛张永刚
Owner CHINA PETROLEUM & CHEM CORP