Process and device for preparing H2 and CO by co-transformation of CH4 and CO2

A technology of co-conversion of CO2, applied in chemical instruments and methods, inorganic chemistry, carbon monoxide, etc., can solve the problems of low synthesis gas yield, carbon deposition and deactivation, high requirements, etc., to overcome low conversion rate, high efficiency conversion, The effect of reducing energy consumption

Inactive Publication Date: 2008-10-22
TSINGHUA UNIV
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the catalytic reforming reaction of methane, the metals supported on the catalyst, that is, the active components, are mostly transition metals of Group VIII, and nickel metal is the most commonly used, but this type of catalyst has a big drawback, which is very easy to Carbon deposition causes catalyst deactivation, thereby terminating the reaction. Usually, some alkaline earth metal or rare earth metal oxides are added as additives to reduce carbon deposition. Using noble metals as active components can effectively inhibit carbon deposition, but the use of noble metals causes A substantial increase in catalyst costs
CH 4 and CO 2 As a substance with high carbon content, the reaction between the two will inevitably cause greater carbon deposition and deactivation problems
[0004] At present, studies have shown that the use of plasma properties can achieve CH at low temperature 4 and CO 2 conversion, but due to the nature of the plasma itself, the process has poor selectivity for products and lim

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process and device for preparing H2 and CO by co-transformation of CH4 and CO2
  • Process and device for preparing H2 and CO by co-transformation of CH4 and CO2
  • Process and device for preparing H2 and CO by co-transformation of CH4 and CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] CH 4 with CO 2 Feed at a molar ratio of 1:1, the reactor operating pressure is 7 atm, in the low temperature plasma reactor, CH 4 The conversion rate reaches 50%, CO 2 The conversion rate reaches 27%, the selectivity of CO is about 60%, and the H 2 The selectivity is about 80%, the remaining gas is C 2 h 6 , C 2 h 4 , C 3 h 8 High carbon hydrocarbons, this mixed gas enters the H 2 Separator, most H 2 is separated, the purity reaches 90%-95%, and the remaining gas enters the CO separator, almost all of the CO and a part of the CO 2 are separated, and a small amount of CH 4 and the remaining H 2 They are also separated, and they enter the high-temperature carbon furnace for burning together to obtain CO gas with a purity of more than 95%. Most of the remaining gas after passing through the CO separator is CH 4 , a small part is CO 2 , they return to the low-temperature plasma reactor together with the raw material gas for the next reaction-separation-separat...

Embodiment 2

[0038] CH4 and CO2 are fed in a molar ratio of 4:1, and the operating pressure of the reactor is 7atm. In the low temperature plasma reactor, CH 4 The conversion rate reaches 14%, CO 2 The conversion rate reaches 42%, the selectivity of CO is about 80%, and the H 2 The selectivity is about 60%, the remaining gas is C 2 h 6 , C 2 h 4 , C 3 h 8 High carbon hydrocarbons, this mixed gas enters the H 2 Separator, most H 2 is separated, the purity reaches 90%-95%, and the remaining gas enters the CO separator, all CO and all CO 2 are separated, and a small amount of CH 4 and the remaining H 2 They are also separated, and they enter the high-temperature carbon furnace for burning together to obtain CO gas with a purity of more than 95%. Almost all of the remaining gas after passing through the CO separator is CH 4 , they return to the low-temperature plasma reactor together with the raw material gas for the next reaction-separation-separation process.

Embodiment 3

[0040] CH4 and CO2 are fed in a molar ratio of 2:1, and the operating pressure of the reactor is 7atm. In the low-temperature plasma reactor, CH 4 The conversion rate reaches 22%, CO 2 The conversion rate reaches 32%, the selectivity of CO is about 64%, H 2 The selectivity is about 70%, the remaining gas is C 2 h 6 , C 2 h 4 , C 3 h 8 High carbon hydrocarbons, this mixed gas enters the H 2 Separator, most H 2 is separated, the purity reaches 90%-95%, and the remaining gas enters the CO separator, all CO and all CO 2 are separated, and a small amount of CH 4 and the remaining H 2 They are also separated, and they enter the high-temperature carbon furnace for burning together to obtain CO gas with a purity of more than 95%. Almost all of the remaining gas after passing through the CO separator is CH 4 , they return to the low-temperature plasma reactor together with the raw material gas for the next reaction-separation-separation process.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for preparing H2 and CO through the cotransformation of CH4 and CO2 and a device thereof, which pertain to the technical filed of petrochemical industry and coal-chemical industry. The reactant gases CH4 and CO2 are premixed by mole ration of 1:1 to 4:1, sent into a plasma reactor for reaction, separated by a polysulphone membrane H2 separator and then separated by a CO separator, with the left gas sent back to be premixed with feed gas, thereby obtaining H2 and CO by circulative preparation. A gas premixer (1), a plasma reactor (2), an H2 separator (3) and a CO separator (4) are connected in sequence, and the outlet that does not separates gas of the CO separator is connected with the inlet of the premixer. The invention also provides a method and a device that include the steps of reaction-separation-separation-reaction-separation-separation for twice or a plurality of times. The method and the device of the invention avoid terminated reaction caused by inactivated catalyst and realize the preparation of H2 and CO at low temperature, effectively reduce the energy consumption and have high transformation rate of CH4 and CO2 and good product selectivity.

Description

technical field [0001] The present invention relates to a low temperature CH 4 and CO 2 Co-transformation to produce H 2 The method and device for CO and CO belong to the technical fields of petrochemical and coal chemical industry. Background technique [0002] CH 4 and CO 2 is the main greenhouse gas, CH 4 CO 2 The reforming reaction can not only realize the simultaneous chemical conversion of the two, but also produce a large amount of synthesis gas for Fischer-Tropsch synthesis and other processes. [0003] At present, the research mainly focuses on the following aspects: thermodynamics research, catalyst loading metal, carrier and additive research, carbon deposition behavior research and reaction kinetics research, etc. According to thermodynamic calculations, it can be known that the reaction is a strong endothermic reaction, at least above 600°C to generate syngas, and to reach a higher CH at above 850°C 4 and CO 2 Therefore, the conventional catalyst cataly...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B3/34C01B31/18C01B32/40
Inventor 程易王琦颜彬航金涌
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap