Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for improving yield of light olefins

A low-carbon olefin and reaction zone technology, applied in chemical instruments and methods, chemical recovery, and hydrocarbon production from oxygen-containing organic compounds, can solve the problem of low yield of low-carbon olefins, improve selectivity, and increase total conversion The effect of the rate and the yield of the target product and the shortening of the residence time

Active Publication Date: 2009-04-08
CHINA PETROLEUM & CHEM CORP +1
View PDF2 Cites 81 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem that the yield of low-carbon olefins in the prior art is not high, and a new method for improving the yield of low-carbon olefins is provided

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
  • Method for improving yield of light olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] in such as figure 1 In the shown reaction device, the average temperature of the first reaction zone 2 is 470°C, the bed density is 80 kg / m3, the average temperature of the second reaction zone 3 is 530°C, and the bed density is 200 kg / m3 . The pressure at the top of the separation zone 7 of the reactor is 0.14 MPa in terms of gauge pressure, pure methanol is fed, the feed is 2 kg / hour, the superficial linear velocity of the gas in the first reaction zone 2 is 1.1 m / s, and the catalyst is modified SAPO -34, the lifting medium of the regenerated catalyst circulation pipe 15 is unreacted methanol and dimethyl ether, and the heat exchange medium between the heat extractor 11 outside the reactor and the ungenerated catalyst is water vapor. The ratio of the diameter of the second reaction zone 3 to the first reaction zone 2 is 1.2:1; the ratio of the diameter of the gas-solid rapid separation device 5 to the diameter of the second reaction zone 3 is 0.3:1. The weight ratio...

Embodiment 2

[0019] According to the conditions described in Example 1, the average temperature of the first reaction zone 2 is 500°C, the bed density is 50 kg / m3, and the gas superficial velocity is at 2.0 m / s. The average catalyst carbon deposit is controlled at about 2% by weight, the average temperature of the second reaction zone 3 is 600°C, the bed density is 150 kg / m3, and the ratio of the diameter of the second reaction zone 3 to the first reaction zone 2 is 2.0:1, the ratio of the diameter of the gas-solid rapid separation device 5 to the diameter of the second reaction zone 3 is 0.1:1. The weight ratio of catalyst regenerated to the regenerator to catalyst returned to the first reaction zone was 2.0:1. The lifting medium of the regenerated catalyst circulation pipe 15 is water vapor, and the opening ratio of the distribution plate at the bottom of the second reaction zone 3 is 0.8%. The feed medium of the axial feed port 12 in the second zone is unreacted methanol and generated ...

Embodiment 3

[0021] According to the conditions described in Example 1, the hydrocarbons above C4 separated by the product separation section are divided into two parts, one part is used as the lifting medium of the regenerated catalyst circulation pipe 15, and the other part passes through the feedstock at the axial position of the second reaction zone 3. The mouth enters the second reaction zone, and the number of feed inlets is two, which is a counter-spray type, and the distance between the feed inlet position and the distribution plate 4 is 1 / 4 of the height of the second reaction zone 3 . Change the average temperature of the first reaction zone 2 to 500°C, the ratio of the diameter of the second reaction zone 3 to the first reaction zone 2 is 1.4:1; The ratio is 0.5:1, and the yield of light olefins reaches 88.43% by weight.

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 improving the yield of low-carbon olefin, which mainly solves the problem that the yield of the low-carbon olefin in the prior art is low. The invention discloses the method for improving the yield of the low-carbon olefin, which mainly comprises the following steps: (1) providing a fluidized bed reactor comprising a first reaction zone, a second reaction zone, a gas-solid separation zone, a catalyst steam stripping zone, and a catalyst circulation zone; (2) putting a raw material with methanol into the first reaction zone to contact a molecular sieve catalyst so as to produce a product with the low-carbon olefin which enters the second reaction zone along with the catalyst to contact a regenerated catalyst from a regenerator so as to produce a product substance flow with higher content of the low-carbon olefin; and (3) separating the product substance flow with the higher content of the low-carbon olefin and the catalyst, putting the product substance flow with the higher content of the low-carbon olefin into a separating section, performing steam stripping on the separated catalyst and putting part of the catalyst into the regenerator for regeneration, wherein part of the catalyst recycles back to the first reaction zone, thus the technical proposal solves the problems better and can be used in the industrial production of the low-carbonolefin.

Description

technical field [0001] The invention relates to a method for increasing the yield of low-carbon olefins. Background technique [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of light olefins are oxygenates, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these oxygenated compounds can be converted from coal, natural gas, biomass and other energy...

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): C07C1/20C07C11/02B01J29/85B01J29/90
CPCY02P20/584
Inventor 齐国祯钟思青张惠明王华文
Owner CHINA PETROLEUM & CHEM CORP
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com