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Method for preparing low-carbon olefin by using supported catalyst through synthesis gas one-step process

A technology of supported catalysts and low-carbon olefins, applied in molecular sieve catalysts, hydrocarbon production from carbon oxides, chemical instruments and methods, etc., can solve problems such as long process routes, simplify process routes, reduce the generation of high-carbon products, The effect of inhibiting coking inactivation

Active Publication Date: 2015-02-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the preparation of light olefins by Fischer-Tropsch synthesis, although the two-step preparation can greatly improve the conversion rate of synthesis gas and the selectivity of target products, the obvious process route is relatively long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1. Add the prepared supported catalyst into the reaction tube, and reduce the supported catalyst with hydrogen diluted with nitrogen for 6 hours, wherein the volume ratio of hydrogen to nitrogen is 1:2; the reduction temperature is 250°C;

[0020] Step 2. After the reduction, the reaction tube is lowered to normal temperature, the reaction system is boosted with synthesis gas to a predetermined reaction pressure, and then the temperature is raised to the reaction temperature for reaction;

[0021] The predetermined reaction pressure is 1MPa; the synthesis gas includes H 2 And CO, and H 2 The volume ratio of CO and CO composition is 1:1; the reaction temperature is 500℃; the volumetric space velocity of the feed of the reaction system is 10000h -1 .

[0022] The supported catalyst for preparing low-carbon olefins by the one-step method of synthesis gas uses SAPO-34 molecular sieve as the catalyst for methanol-to-olefin reaction (MTO) as the carrier; the active components of...

Embodiment 2

[0027] Step 1. Add the prepared supported catalyst into the reaction tube, and reduce the supported catalyst with hydrogen diluted with nitrogen for 8 hours, wherein the volume ratio of hydrogen to nitrogen is 1:19; the reduction temperature is 260°C;

[0028] Step 2. After the reduction, the reaction tube is lowered to room temperature, the reaction system is boosted with synthesis gas to a predetermined reaction pressure, and then the temperature is raised to the reaction temperature for reaction;

[0029] The predetermined reaction pressure is 3MPa; the synthesis gas includes H 2 And CO, and H 2 The volume ratio of CO and CO composition is 1:6; the reaction temperature is 200°C; the feed volume space velocity of the reaction system is 4000h -1 .

[0030] The supported catalyst for preparing low-carbon olefins by the one-step synthesis gas method uses the catalyst of methanol-to-olefin reaction (MTO) that is ZSM-5 molecular sieve as the carrier; the active components of the catalyst...

Embodiment 3

[0035] Step 1. Add the prepared supported catalyst into the reaction tube, and reduce the supported catalyst with hydrogen diluted with nitrogen for 4 hours, wherein the volume ratio of hydrogen to nitrogen is 1:9; the reduction temperature is 280°C;

[0036] Step 2. After the reduction, the reaction tube is lowered to room temperature, the reaction system is boosted with synthesis gas to a predetermined reaction pressure, and then the temperature is raised to the reaction temperature for reaction;

[0037] The predetermined reaction pressure is 5MPa; the synthesis gas includes H 2 And CO, and H 2 The volume ratio of CO and CO composition is 1:2; the reaction temperature is 300°C; the volumetric space velocity of the feed of the reaction system is 2000h -1 .

[0038] The supported catalyst for preparing low-carbon olefins by the one-step method of synthesis gas uses ZSM-5 molecular sieve as a catalyst for methanol-to-olefin reaction (MTO); the active components of the catalyst in the ...

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Abstract

The invention discloses a method for preparing low-carbon olefin by using a supported catalyst through synthesis gas one-step process. The method comprises the following steps of: 1. adding the prepared supported catalyst to a reaction tube, and reducing the supported catalyst for 2-8 hours by using hydrogen diluted by nitrogen, wherein the volume ratio of hydrogen to nitrogen is 1: (2-19), and the reduction temperature is 250-280 DEG C; and 2. after the reduction is ended, cooling the reaction tube to normal temperature, boosting a reaction system to a predetermined reaction pressure by using the synthetic gas, heating again to the reaction temperature for reaction, wherein the predetermined reaction pressure is 1-10Mpa, the synthesis gas comprises H2 and CO, the volume ratio of H2 to CO is (1-6):1, the reaction temperature is 200-500 DEG C, and the feed volume hourly space velocity of the reaction system is 100-10000h<-1>. The method has the advantages of simplifying process route, improving the conversation rate of CO and the selectivity of ethylene and propylene and prolonging the service life of a composite catalyst.

Description

technical field [0001] The invention belongs to the field of catalyst research for the synthesis of low-carbon olefins, and in particular relates to a method for preparing low-carbon olefins by using a supported catalyst to realize a one-step synthesis gas method. technical background [0002] Low-carbon olefins, especially ethylene and propylene, are important chemical raw materials. my country's petroleum is relatively insufficient, so it is an inevitable choice to use coal as raw material to develop a route to replace petroleum resources to produce low-carbon olefins. This route adopts a two-step method, that is, firstly methanol is produced from synthesis gas, and then light-carbon olefins are synthesized from methanol. For the methanol synthesis reaction, copper-based catalysts are currently one of the best catalysts for industrial methanol synthesis. Catalysts composed of copper-zinc-aluminum oxides have the advantages of high selectivity, less by-products and lower r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C11/06C07C1/04B01J29/85B01J29/46
CPCY02P20/52
Inventor 程党国余盈莹陈丰秋詹晓力
Owner ZHEJIANG UNIV
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