Method for producing ethylene and propylene by catalytic cracking of lightweight petroleum hydrocarbons

A light petroleum hydrocarbon, catalytic cracking technology, applied in the field of light petroleum hydrocarbon catalytic cracking to produce ethylene and propylene, can solve the problems of low selectivity of target products, low yield of ethylene and propylene, low catalyst activity, etc., to achieve economical improvement Benefits and social benefits, the effect of increasing the cracking reaction speed and relieving huge pressure

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
View PDF13 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The catalyst disclosed in CN101279881A is a technical scheme in which the catalyst is selected from at least one of ZSM-5 / mordenite symbiotic molecular sieve, ZSM-5 / beta zeolite symbiotic molecular sieve or ZSM-5 / Y zeolite symbiotic molecular sieve, mainly solving naphtha catalytic cracking to produce ethylene propylene The short life of the catalyst due to coking during the reaction
[0012] To sum up, the existing catalytic cracking of light petroleum hydrocarbons to produce ethylene and propylene mainly focuses on the development of process and catalyst technology. In these technologies, when a higher reaction temperature (greater than 700°C) is used, although higher ethylene and propylene can be obtained Propylene yield, but the by-products increased significantly, the selectivity of the target product was low, and the process energy consumption was large; when the lower reaction temperature was around 650 ° C, the catalyst activity was low, and the yield of ethylene and propylene was low

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 producing ethylene and propylene by catalytic cracking of lightweight petroleum hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0067] According to one embodiment of the present invention, when the method of the present invention is carried out in riser reactor, generally carry out as follows:

[0068] The regenerated catalyst rich in mesoporous zeolite (catalytic cracking catalyst) enters the pre-lift section of the riser reactor and flows upward under the action of the pre-lift medium. The preheated feedstock oil is mixed with carbon dioxide, and the mixture flow is together with atomized steam Inject into the lower part of the riser reactor, contact with the regenerated catalyst for catalytic cracking reaction and flow upward at the same time; the reacted stream enters the cyclone separator through the outlet of the riser reactor, and the separated reaction oil gas extraction device is further separated to obtain methane, ethylene and propylene , C4 hydrocarbons, pyrolysis gasoline and other fractions; the separated unborn catalyst enters the regenerator for coke regeneration, and the regenerated cat...

Embodiment 1

[0085] Carry out test according to the flow process of accompanying drawing, test on the medium-sized device of riser reactor, raw material oil is straight-run naphtha, and the raw material oil of preheating enters riser bottom after mixing with carbon dioxide (CO 2 The mass ratio to raw oil is 1:100), and the cracking reaction is carried out at a reaction temperature of 635°C, a reaction time of 2.0 seconds, a weight ratio of catalytic cracking catalyst to raw oil of 25, and a weight ratio of water vapor to raw oil of 0.3 , the reaction oil gas and water vapor and the raw catalyst enter the closed cyclone separator from the outlet of the reactor, the reaction oil gas and the raw catalyst are quickly separated, and the reaction oil gas is cut according to the distillation range in the separation system, so as to obtain methane, ethylene, propylene, mixed Fractions such as carbon four components and pyrolysis gasoline.

[0086] The raw catalyst enters the stripping section unde...

Embodiment 2

[0093] This embodiment is tested according to the flow process of accompanying drawing, and raw material oil is straight-run naphtha, and test is carried out on the medium-sized device of riser reactor, and the raw material oil of preheating and CO 2 After mixing, it enters the bottom of the riser (CO 2 The mass ratio to the raw oil is 1:100), and the cracking reaction is carried out under the conditions of a reaction temperature of 635°C, a reaction time of 2.0 seconds, a weight ratio of catalytic cracking catalyst to raw oil of 25, and a weight ratio of water vapor to raw oil of 0.3 , the reaction oil gas and water vapor and the raw catalyst enter the closed cyclone separator from the outlet of the reactor, the reaction oil gas and the raw catalyst are quickly separated, and the reaction oil gas is cut according to the distillation range in the separation system, so as to obtain methane, ethylene, propylene, mixed Fractions such as carbon four components and pyrolysis gasoli...

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

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

A method for producing ethylene and propylene by catalytic cracking of lightweight petroleum hydrocarbons is as follows: a preheated lightweight hydrocarbon oil raw material and carbon dioxide are mixed and then enter the bottom of a riser reactor for catalytic cracking reaction by contacting with a regenerated catalyst, reaction oil gas and a spent catalyst enter a cyclone separator for gas-solid separation, and the separated reaction oil gas is led out of the device for further separation to obtain ethylene, propylene and a C4 hydrocarbon fraction and other products; and the separated spent catalyst is stripped and enters a catalyst regenerator for regeneration by burning, and the regenerated catalyst returns to the reactor for recycle. The method improves the low-temperature activity of a catalytic cracking catalyst and the yield of ethylene and propylene by the reasonable adjusting of properties of the catalyst.

Description

technical field [0001] The present invention relates to a method for catalytic conversion of hydrocarbon oil in the absence of hydrogen, in particular to a method for catalytic cracking of light petroleum hydrocarbons to produce ethylene and propylene. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. Through ethylene polymerization, alkylation with benzene, and addition reaction with water, oxygen, and halogen, a series of extremely valuable derivatives can be obtained. The world ethylene industry continues to maintain a steady development trend. At present, about 98% of the world's ethylene comes from tube furnace steam cracking technology. Among the raw materials for ethylene production, naphtha accounts for 46% and ethane accounts for 34%. [0003] Propylene is one of the most important olefins, second only to ethylene in consumption. The derivative of propylene with the largest amount is polypropylen...

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): C07C11/04C07C11/06C07C4/06
CPCY02P20/141Y02P20/52Y02P20/584
Inventor 龙军魏晓丽
Owner CHINA PETROLEUM & CHEM CORP
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