Unlock instant, AI-driven research and patent intelligence for your innovation.

Integrated process for directly converting methane to ethylene

A technology of methane and ethylene, which is applied in the integrated process field of direct conversion of methane to ethylene, can solve the problems of long synthesis route and large investment in equipment, and achieve self-heat balance, economic efficiency and rational utilization

Inactive Publication Date: 2019-07-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
View PDF12 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method provides an alternative method for the production of ethylene and propylene under the background of my country's energy structure of "lack of oil, less gas, and relatively rich coal", but this method has the disadvantages of long synthesis route and excessive equipment investment

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
  • Integrated process for directly converting methane to ethylene
  • Integrated process for directly converting methane to ethylene
  • Integrated process for directly converting methane to ethylene

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Put 5mL of the OCM catalyst disclosed in Chinese patent CN201811460300.2 and 20mL of the ethane dehydrogenation catalyst disclosed in Chinese patent CN201610003116 into the first cavity (tube side) 5 and the second cavity (shell side) 6 of the reactor respectively ( figure 2 ). The operation steps are as follows:

[0018] (1) In a nitrogen atmosphere, the OCM catalyst was heated to 500 °C. Then close the nitrogen, and feed 240mL / min methane and 60mL / min oxygen through the tube side inlet 1. At a temperature of 600°C and a pressure of 0.1MPa, the ethylene concentration in the stream obtained at the tube side outlet 2 is 8.2%. The rate is 16.3%.

[0019] (2) Feed 120mL / min of ethane through the shell side inlet 3. After stabilization, the shell side temperature is maintained at 550°C and the pressure is 0.1MPa. The ethylene concentration in the stream obtained from the shell side outlet 4 is 31.2%, and the ethane conversion rate is 48%.

[0020] (3) After the heat is...

example 2

[0023] Put 5mL of the OCM catalyst disclosed in Chinese patent CN201811460300.2 and 20mL of the ethane dehydrogenation catalyst disclosed in Chinese patent CN201610134338.5 into the first chamber (tube side) 5 and the second chamber (shell side) 6 of the reactor respectively middle( figure 2 ). The operation steps are as follows:

[0024] (1) In a nitrogen atmosphere, the OCM catalyst was heated to 700 °C. Then close the nitrogen, and feed 240mL / min methane and 60mL / min oxygen through the tube side inlet 1. At a temperature of 750°C and a pressure of 0.1MPa, the ethylene concentration in the stream obtained at the tube side outlet 2 is 12.7%. The rate is 24.1%.

[0025] (2) Feed 150mL / min ethane through the shell side inlet 3. After stabilization, the shell side temperature is maintained at 650°C and the pressure is 0.1MPa. The ethylene concentration in the stream obtained from the shell side outlet 4 is 31.6%, and the ethane conversion rate is 53%.

[0026] (3) After th...

example 3

[0029] Put 5mL of the OCM catalyst disclosed in Chinese patent CN201811459030.3 and 20mL of the ethane dehydrogenation catalyst disclosed in Chinese patent CN201610134338.5 into the first chamber (tube side) 5 and the second chamber (shell side) 6 of the reactor respectively middle( figure 2 ). The operation steps are as follows:

[0030] (1) In a nitrogen atmosphere, the OCM catalyst was heated to 675°C. Then close the nitrogen, and feed 240mL / min methane and 120mL / min oxygen through the tube side inlet 1. At a temperature of 675°C and a pressure of 0.2MPa, the ethylene concentration in the stream obtained at the tube side outlet 2 is 11.8%. The rate is 22.1%.

[0031] (2) Feed 160mL / min ethane through the shell side inlet 3. After stabilization, the shell side temperature is maintained at 600°C and the pressure is 0.1MPa. The ethylene concentration in the stream obtained from the shell side outlet 4 is 32.7%, and the ethane conversion rate is 51%.

[0032] (3) After th...

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 the technical field of methane conversion, in particular to an integrated process for directly converting methane to ethylene. According to the integrated process for directlyconverting the methane to the ethylene, methane oxidative coupling reaction and alkane cracking reaction are simultaneously carried out in different cavities of a coupling reactor, methane and oxygen-containing raw gas entering a first cavity is subjected to the methane oxidative coupling reaction under the action of a first catalyst to release heat, the heat is transferred to a second cavity through an interlayer wall, a ethane and C2+ mixture entering the second cavity are subjected to the alkane cracking reaction under the action of a second catalyst to absorb the heat, and the coupling reactor is a jacketed packed bed type formed by a tube side and a shell side or a tubular tube and sell side heat exchange type coupling reactor.

Description

technical field [0001] The invention relates to the technical field of methane conversion, in particular to an integrated process for directly converting methane to ethylene. Background technique [0002] Ethylene is not only an important bulk petrochemical product, but also a bulk chemical raw material. At present, the routes for producing ethylene include petroleum-based routes and coal-based routes, among which the petroleum-based routes are mainly hydrocarbon cracking methods, that is, ethylene is produced by tubular thermal cracking with ethane and propane as cracking raw materials. However, with the continuous increase in the demand for olefins, only ethylene and propane as cracking raw materials are far from meeting the market demand for olefins, and the cracking raw materials have begun to develop towards heavy ones. In recent years, the coal-based ethylene route MTO technology developed by the Dahua Institute of the Chinese Academy of Sciences and the Shanghai Petr...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/84C07C11/04C07C5/333
CPCC07C2/84C07C5/333C07C11/04Y02P20/10
Inventor 李德宝夏铭林明桂贾丽涛侯博郭荷芹李莉
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI