A kind of method for preparing isobutene

A technology of isobutene and main reactor, applied in ether preparation, chemical instruments and methods, unsaturated compound addition to prepare ether, etc., can solve the problems of secondary reaction of isobutene, influence of device operation cycle, untimely gas-liquid separation, etc.

Active Publication Date: 2021-02-09
CHAMBROAD CHEM IND RES INST CO LTD +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor heat transfer in the fixed-bed reactor, continuous heat exchange is the only way to react with strong heat changes. The temperature is not easy to control, and it is easy to cause local overheating, coking and deactivation of the catalyst, and affect the operating cycle of the device.
The bed layer drop is large, the gas-liquid separation is not timely, and the secondary reaction of isobutene is easy to occur, which reduces the yield

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
  • A kind of method for preparing isobutene
  • A kind of method for preparing isobutene
  • A kind of method for preparing isobutene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of method for preparing isobutylene, under the action of molecular sieve catalyst, glycol ether is catalytically cracked in fluidized bed, and this technique is realized by following device:

[0041] The device comprises a fluidized bed cracking main reactor (R104), and the deactivated catalyst outlet (202) at the bottom of the fluidized bed cracking main reactor (R104) is connected with the deactivated catalyst regeneration tank (D103), The upper part of bed cracking main reactor (R104) is provided with fresh catalyst inlet (203), and described fresh catalyst inlet (203) links to each other with deactivated catalyst regeneration tank (D103), and described fluidized bed cracking main reactor (R104 ) bottom is also provided with a raw material inlet (201), and the top of the fluidized bed cracking main reactor (R104) is provided with a gas production outlet (204), and the gas production outlet (204) is connected with the gas-liquid separation tank (V106) The gas-l...

Embodiment 2

[0046] The raw material is 97% ethylene glycol mono-tert-butyl ether, and the active component is ZSM-5 silica gel particle molecular sieve as the catalyst. figure 1 In the process flow shown, 25kg of activated catalyst is loaded into the regeneration tank, the preheating temperature of the raw material is 190°C, the raw material is heated to 220°C through the heater, and the external heat collector is adjusted from the feed pipe distributor into the main reactor. The reaction temperature is controlled at 210°C, the residence time of the gas phase in the dense phase catalyst bed is about 1.5s, the reaction gas enters the condenser through the top of the tower and is cooled to 60°C and enters the gas-liquid separation tank, and the liquid phase in the gas-liquid separation tank The diol enters the ethylene glycol refining tower, and the gas phase enters the isobutene gas production buffer tank. The catalyst in the regenerator is burnt in the air, and the regeneration temperature...

Embodiment 3

[0048] With the content of 56% ethylene glycol mono-tert-butyl ether and 44% ethylene glycol di-tert-butyl ether as raw material, the active component is ZSM-5 silica gel particle molecular sieve as catalyst, using figure 1 In the process flow shown, 25kg of activated catalyst is loaded into the regeneration tank, the preheating temperature of the raw material is 190°C, and the raw material is heated to 250°C through a heater. Enter the main reactor from the tubular feed distributor, adjust the external heat collector, control the reaction temperature to be 210 and 240°C respectively, the residence time of the gas phase in the dense phase catalyst bed is about 1.5s, and the reaction gas enters through the top of the tower The condenser is cooled to 60°C and enters the gas-liquid separation tank. The liquid phase in the gas-liquid separation tank enters the ethylene glycol light removal tower, and the gas phase enters the isobutene gas production buffer tank. The catalyst in the...

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 discloses a method for preparing isobutene. The purpose of the invention is to provide a method for producing isobutene. The method is to utilize C 4 The glycol ether formed by reacting with glycol, under the action of molecular sieve catalyst, can produce high-purity isobutene stably and efficiently in a circulating fluidized bed for a long period of time.

Description

technical field [0001] The invention relates to the technical field of chemical product manufacturing, in particular to a method for preparing high-purity isobutylene by catalytic cracking of glycol ethers, in particular to the cracking reaction of glycol ethers by using a fluidized bed reactor. Background technique [0002] High-purity isobutene (HPI) generally refers to products with isobutene purity higher than 99.5%, to distinguish it from mixed fraction isobutene from petroleum refining units and ethylene steam cracking units. High-purity isobutylene can be used in fine chemicals, such as butyl rubber, polyisobutylene, methacrylate (MMA), tert-butylmercaptan, tert-butylphenol, antioxidants, tert-butylamine and other organic chemical products. Versatile and growing demand. There are three main sources of isobutene. The first is liquefied petroleum gas (LPG) from domestic refineries, which is currently the most common source of isobutene in China; the second is from impo...

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): C07C1/20C07C11/09C07C41/06C07C43/10
CPCC07C1/20C07C41/06C07C2529/40C07C2529/85C07C11/09C07C43/10Y02P20/584Y02P30/20Y02P30/40
Inventor 郭亮马韵升陈梅梅张凤岐刘克锋刘鹏李艳芳刘莎龙显灵
Owner CHAMBROAD CHEM IND RES INST CO LTD
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