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Method for dehydrogenating hydrogen-containing substance

A dehydrogenation and material technology, applied in chemical instruments and methods, hydrogen, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as cracking, catalyst activity reduction, deactivation, etc.

Active Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are both hydrogenation and dehydrogenation processes in the organic liquid hydrogen storage technology. The hydrogenation process is relatively simple and the technology is relatively mature. The dehydrogenation process is a strongly endothermic and highly reversible reaction. Therefore, from the perspective of kinetics and thermodynamics, High temperature is conducive to the dehydrogenation reaction, but side reactions such as cracking and carbon deposition are prone to occur at high temperature, which will reduce the activity of the catalyst or even deactivate it.

Method used

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  • Method for dehydrogenating hydrogen-containing substance

Examples

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Effect test

Embodiment 1

[0036] Send the mixture of methylcyclohexane and cyclohexane into the first dehydrogenation reactor 1 at a temperature of 240°C, a pressure of 0MPa, and a space velocity of 5h -1 , the catalyst is PtFeCo / Al 2 o 3 Pass through the catalyst bed under the conditions of the above conditions, the conversion rate of methylcyclohexane and cyclohexane is 40%, then enter the first separator 1, and separate at a temperature of 200 ° C and a pressure of 0 MPa, and the bottom flow enters the second Dehydrogenation reactor 3, at a temperature of 280°C, a pressure of 0MPa, and a space velocity of 4h -1 , the catalyst is PtFeCo / Al 2 o 3 It passes through the catalyst bed under certain conditions, and then enters the second separator 4 together with the top stream of the first separator 1. The composition of reactants and products in the second separator 4 was measured to obtain the conversion rate, the conversion rate was 90% at 5h, and 83% at 50h. The coking rate of the catalyst was 0....

Embodiment 2

[0038] Send the mixture of methylcyclohexane and cyclohexane into the first dehydrogenation reactor 1 at a temperature of 220°C, a pressure of 0MPa, and a space velocity of 5h -1 , the catalyst is PtFeCo / Al 2 o 3 Pass through the catalyst bed under the conditions of the above conditions, the conversion rate of methylcyclohexane and cyclohexane is 38%, then enter the first separator 1, and separate at a temperature of 200 ° C and a pressure of 0 MPa, and the bottom flow enters the second Dehydrogenation reactor 3, at a temperature of 280°C, a pressure of 0MPa, and a space velocity of 4h -1 , the catalyst is PtFeCo / Al 2 o 3 It passes through the catalyst bed under certain conditions, and then enters the second separator 4 together with the top stream of the first separator 1. The composition of reactants and products in the second separator 4 was measured to obtain the conversion rate, the conversion rate was 86% at 5h, and 78% at 50h. The coking rate of the catalyst was 0....

Embodiment 3

[0040] Send the mixture of methylcyclohexane and cyclohexane into the first dehydrogenation reactor 1 at a temperature of 280°C, a pressure of 0MPa, and a space velocity of 5h -1 , the catalyst is PtFeCo / Al 2 o 3 Pass through the catalyst bed under the conditions of the above conditions, the conversion rate of methylcyclohexane and cyclohexane is 49%, and then enter the first separator 1, separate at a temperature of 200 ° C and a pressure of 0 MPa, and the bottom flow enters the second Dehydrogenation reactor 3, at a temperature of 280°C, a pressure of 0MPa, and a space velocity of 4h -1 , the catalyst is PtFeCo / Al 2 o 3 It passes through the catalyst bed under certain conditions, and then enters the second separator 4 together with the top stream of the first separator 1. The composition of reactants and products in the second separator 4 was measured to obtain the conversion rate, the conversion rate was 96% at 5h, and 80% at 50h. The coking rate of the catalyst was 1%...

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Abstract

The invention relates to a method for dehydrogenating a hydrogen storage substance, which comprises the following steps: 1) feeding a hydrogen-containing substance into a first dehydrogenation reactor (1) to make contact with a dehydrogenation catalyst, and carrying out a first dehydrogenation reaction; 2) then sending an outlet material of the first dehydrogenation reactor (1) into a first gas phase separator (2) for separation, and sending the bottom material flow of the first gas phase separator (2) into a second dehydrogenation reactor (3) for a second dehydrogenation reaction; and 3) feeding a bottom material flow of the second dehydrogenation reactor (3) and a top material flow of the first gas phase separator (2) into a second separator (4) together, obtaining hydrogen from the top of the second separator (4), and obtaining a dehydrogenation product and an unreacted hydrogen-containing compound from the bottom. The dehydrogenation method provided by the invention can ensure that the total conversion rate of the hydrogen-containing compound is not reduced under the condition that the first reactor and the second reactor are basically not coked or the coking amount is relatively small.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage and dehydrogenation of compounds, and in particular relates to a method for dehydrogenating hydrogen-containing substances. Background technique [0002] As a green and sustainable new energy with abundant reserves, wide sources, high energy density, and clean combustion, hydrogen energy can solve the current problems faced by fossil energy and shows a good application prospect. In recent years, the development and utilization of hydrogen energy have been highly valued by developed countries such as the United States, Japan, and Europe, and a large amount of funds have been invested to support hydrogen energy research and development and application demonstration activities. World-renowned energy companies such as Shell, Chevron, and Texaco have taken hydrogen energy development as an important strategy for their company's development. It is conceivable that with the advancement of scien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00B01J23/42B01J23/89B01J23/44B01J23/60
CPCC01B3/0015B01J23/42B01J23/892B01J23/8906B01J23/44B01J23/60Y02E60/32
Inventor 童凤丫孙清王昊缪长喜张新玉
Owner CHINA PETROLEUM & CHEM CORP
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