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

Method for increasing yield of low-carbon olefins

A low-carbon olefin and stripping zone technology, applied in chemical recovery, ethylene production, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of low yield of ethylene and propylene

Active Publication Date: 2014-04-23
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 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 low yield of ethylene and propylene in the prior art, 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 increasing yield of low-carbon olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] in such as figure 1 In the small circulating fluidized bed reaction device shown, the catalyst is SAPO-34, the bottom of the second reaction zone is connected to the top of the first reaction zone, and the stripping zone is located at the top of the second reaction zone. Methanol with a purity of 99.5% enters the first reaction zone of the reactor and contacts with the catalyst. The reaction conditions in the first reaction zone are: the reaction pressure is 0.01MPa in terms of gauge pressure, the average temperature is 420°C, and the average carbon deposition of the catalyst is 1.5%. weight. The gas phase stream and the catalyst in the first reaction zone enter the second reaction zone to form a product stream comprising light olefins and oxygen-containing compounds, and simultaneously form a catalyst to be produced. The product stream is separated to form an oxygen-containing compound with a mass fraction of 66%. The back-smelting logistics, after analysis, the oxyge...

Embodiment 2

[0023] According to the conditions and steps described in Example 1, except that the catalyst type was changed to SAPO-18, the carbon-based yield of light olefins was 80.17% (by weight).

Embodiment 3

[0025] According to the conditions and steps described in Example 1, the reaction conditions in the first reaction zone are: the reaction pressure is 0.01 MPa in terms of gauge pressure, the average temperature is 460° C., and the average carbon deposition amount of the catalyst is 3.5% by weight. The mass ratio of the oxygenate in the reclamation stream to the methanol feed in the raw material is 0.06, and the temperature of the total feed in the first reaction zone is 230°C. The raw catalyst enters the stripping zone of the reactor, and is divided into two parts after stripping, 50% returns to the bottom of the first reaction zone, and 50% enters the regenerator for regeneration, forming a carbon deposit with a mass fraction of 0.5% and a temperature of 550°C. The catalyst is regenerated, and the regenerated catalyst is returned to the second reaction zone of the reactor. The reaction conditions in the second reaction zone are as follows: the reaction pressure is 0.01 MPa in...

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 increasing the yield of low-carbon olefins, which mainly solves the problem of low yield of the low-carbon olefins in the prior art. According to the technical scheme provided by the invention, the method comprises the following steps: (1) a methanol raw material enters a first reaction zone to be in contact with a catalyst, and a gas-phase material flow and the catalyst enter a second reaction zone so as to form a product material flow and simultaneously form a spent catalyst; (2) after the product material flow is separated, a recycled material flow with more than 50% of an oxygen-containing compound in percentage by mass is formed and enters the first reaction zone after being heated, the spent catalyst enters a steam stripping zone and is divided into two parts at least after being subjected to steam stripping, one part of the spent catalyst returns to the first reaction zone through an external heat remover, and a second part of the spent catalyst enters a regenerator for generation so as to form a regenerated catalyst; and (3) the regenerated catalyst returns to the second reaction zone, wherein the methanol conversion ratio at an outlet of the first reaction zone is 70% to 100%, and the temperature of the second reaction zone is 30-70 DEG C higher than that of the first reaction zone. With the adoption of the technical scheme, the problem is better solved, so that the method can be applied to the industrial production of ethylene and propylene.

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 low-carbon olefins is oxygenated compounds, 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 an...

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 Patents(China)
IPC IPC(8): C07C1/20C07C4/06C07C11/04C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯张惠明王莉王菊
Owner CHINA PETROLEUM & CHEM CORP