Method for preparing propylene by catalyzing methanol/dimethyl ether with composite molecular sieve with core-shell structure

A molecular sieve catalyzed methanol and composite molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc.

Inactive Publication Date: 2011-05-04
FUDAN UNIV +1
View PDF12 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of HZSM-5 and mesoporous molecular sieve core-shell composite structure m

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, methanol propylene reaction:

[0012] A core-shell molecular sieve with a silicon-aluminum ratio of 140 HZSM-5 molecular sieve as the core and SBA-15 molecular sieve as the shell (HZSM-5 particle size 400 nm, SBA-15 shell thickness 200 nm) was selected as the catalyst. After molding and granulating to 40-60 mesh, put it into a fixed-bed reactor with an inner diameter of 6mm, fill the upper and lower parts of the catalyst with quartz sand, heat the catalyst to about 460 °C with nitrogen, pretreat for 5 hours, and then pass methanol and water Steam mixed with feed gas, the liquid hourly space velocity is 2 h -1 , the molar ratio of methanol to water vapor is 1:3, and the reaction pressure is 0.1 MPa. The methanol conversion rate is 100%, the propylene selectivity reaches 54.1%, and the P / E ratio reaches 15.0.

Embodiment 2

[0013] Embodiment 2, reaction of methanol to propylene:

[0014] A core-shell molecular sieve with a silicon-aluminum ratio of 140 HZSM-5 molecular sieve as the core and SBA-15 molecular sieve as the shell (HZSM-5 particle size 400 nm, SBA-15 shell thickness 200 nm) was selected as the catalyst. After molding and granulating to 40-60 mesh, put it into a fixed-bed reactor with an inner diameter of 6mm, fill the upper and lower parts of the catalyst with quartz sand, heat the catalyst to about 400 °C with nitrogen, pretreat for 5 hours, and then pass methanol and nitrogen Mixed feed gas with a liquid hourly space velocity of 1 h -1 , the molar ratio of methanol to nitrogen is 5:1, and the reaction pressure is 0.1 MPa. The conversion rate is 97.6%, the propylene selectivity reaches 41.9%, and the P / E ratio is 7.6.

Embodiment 3

[0015] Embodiment 3, methanol propylene reaction:

[0016] HZSM-5 molecular sieve with a silicon-aluminum ratio of 280 was selected as the core, and SBA-15 molecular sieve was used as the shell (HZSM-5 particle size 800 nm, SBA-15 shell thickness 300 nm) as the catalyst. After molding and granulating to 40-60 mesh, put it into a fixed-bed reactor with an inner diameter of 6mm, fill the upper and lower parts of the catalyst with quartz sand, heat the catalyst to about 460 °C with nitrogen, pretreat for 5 hours, and then pass methanol and water Steam mixed with feed gas, the liquid hourly space velocity is 0.1 h -1 , the molar ratio of methanol to water vapor is 1:10, and the reaction pressure is 0.1 MPa. The conversion rate is 97.7%, the propylene selectivity reaches 48.0%, and the P / E ratio is 14.2.

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 belongs to the technical field of chemical industry, in particular to a method for preparing propylene by catalyzing methanol/dimethyl ether with a composite molecular sieve with a core-shell structure. In the invention, a composite molecular sieve catalyst consisting of an HZSM-5 molecular sieve and a mesoporous molecular sieve is adopted, methanol or/and dimethyl ether is/are used as raw material gas, water vapor and/or nitrogen are/is used as diluent gas to carry out a contact reaction to prepare propylene. The composite molecular sieve with the core-shell structure has the advantages that good propylene selectivity can be obtained, and better activity stability can be realized.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for preparing propylene from methanol / dimethyl ether catalyzed by a composite molecular sieve with a core-shell structure. Background technique [0002] Propylene is one of the most used petrochemicals in the world and maintains an annual growth rate of 5-6%. The traditional production method of propylene is through steam reforming process and petroleum catalytic cracking, but with the shortage of petroleum resources, the supply and demand of propylene become tense year by year. In response to the gap in market supply, global petrochemical companies have developed a variety of technologies to try to fill the gap in demand, among which methanol olefination to propylene (MTP) technology can use abundant coal and natural gas resources, or other clean and environmentally friendly ways to obtain raw material methanol, Therefore, it has ...

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): C07C11/06C07C1/20B01J29/80
CPCY02P20/52
Inventor 徐华龙杜俊明沈伟杨依苏钱旭芳赵东元魏建华张春雷宁春利曾义红
Owner FUDAN 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