Gas-liquid-solid three-phase counter-current reaction device and method for pyrolytic reaction of carbamic acid ester

A carbamate and pyrolysis reaction technology, which is applied in the field of gas-liquid-solid three-phase countercurrent reaction devices, can solve the problems of poor radial heat transfer effect of three-phase reactors, and achieves overcoming uneven radial temperature distribution and reducing Possibility, effect of uniform temperature distribution

Active Publication Date: 2014-04-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a kind of gas-liquid-solid three-phase countercurrent reaction device and its method for carbamate pyrolysis reaction, overcome the shortcoming that the radial heat transfer effect of existing three-phase reactor is all relatively poor, has equipment Simple structure, low manufacturing cost, high mass and heat transfer efficiency, etc. It is suitable for reaction systems that require rapid heat supply and sufficient heat and mass transfer effects, and is easy for industrial application

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
  • Gas-liquid-solid three-phase counter-current reaction device and method for pyrolytic reaction of carbamic acid ester
  • Gas-liquid-solid three-phase counter-current reaction device and method for pyrolytic reaction of carbamic acid ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see figure 1 and figure 2 . The raw material liquid of wt (MDC)=3.0% is preheated to 180 ℃ in storage tank 7 (MDC: diphenylmethane dicarbamate methyl ester), v (N 2 )=150mL / min carrier gas (nitrogen) is preheated to 180°C in the carrier gas preheater 3, and the heat carrier 19 is preheated to 250°C. After the preheating is completed, feed materials, wherein the thermal decomposition reaction temperature is 270° C., and the reaction time is 12 minutes. The raw material liquid and the nitrogen gas are fully countercurrently contacted in the reactor, and the by-product methanol is brought out by the nitrogen gas, which is condensed and collected by the condenser 8, wherein the condensation temperature is -10°C, and the reacted feed liquid flows into the product collection bottle 10 through the feed liquid outlet 14, And condensed preservation, wherein, the condensation temperature is 5 ℃. The results show that the thermal decomposition reaction of MDC is a step-by-ste...

Embodiment 2

[0034] See Example 1. The raw material liquid is preheated to 220°C, the carrier gas (nitrogen) is preheated to 220°C, the heat carrier is preheated to 270°C, the methanol condensation temperature is -25°C, the product condensation temperature is 0°C, and the thermal decomposition reaction temperature is 270°C. The reaction time is 15 minutes. The results showed that under the above reaction conditions, the conversion rate of MDC was close to 100%, and the total molar yield of MMI and MDI reached 88%.

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
boiling pointaaaaaaaaaa
Login to view more

Abstract

The invention discloses a gas-liquid-solid three-phase counter-current reaction device and a gas-liquid-solid three-phase counter-current reaction method for pyrolytic reaction of carbamic acid ester, and belongs to the technical field of pyrolytic reaction of carbamic acid ester. The reaction device comprises a reactor, a carrier gas preheating part, a feeding part, a product collecting part, a byproduct collecting and condensing part, a gas outlet and a feed liquid outlet. The upper part of the reactor is provided with a feed liquid inlet, the bottom of the reactor is provided with a gas inlet, and gas and liquid in the reactor are in counter-current contact so as to form a gas-liquid-solid three-phase counter-current reactor; carrier gas is preheated by the preheater, and enters the reactor through the gas inlet; the reaction feed liquid is preheated in the feeding part, and enters the reactor through the feed liquid inlet; in the reactor, the reaction feed li quid and the carrier gas are in counter-current contact fully, heat is transferred by a heat carrier, and the pyrolytic reaction is carried out; the carrier gas brings byproducts alcohols out from the gas outlet on the upper part of the reactor, and the reaction feed liquid is moved through the feed liquid outlet on the bottom of the reactor; and the byproduct collecting and condensing part collects, condenses and recovers the byproducts alcohols. The device and the method have the advantages of quick heat and mass transfer of gas, liquid and solid.

Description

technical field [0001] The invention belongs to the technical field of carbamate pyrolysis reaction, in particular to a gas-liquid-solid three-phase countercurrent reaction device and method for carbamate pyrolysis reaction; the reaction device can be used for carbamate pyrolysis reaction In the reaction of decomposing isocyanate, it is especially suitable for reaction systems that require rapid heat supply and sufficient heat and mass transfer effects. technical background [0002] Isocyanate is an important raw material for the production of polyurethane. It is mainly used to prepare polyurethane elastomers, polyurethane coatings, polyurethane adhesives, etc. It is widely used in aerospace, construction, vehicles, refrigeration and other departments. With the sustained and high-speed development of my country's national economy, especially the continuous development of construction and other industries, the demand for isocyanate has grown rapidly. It is necessary to import...

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): C07C263/04C07C265/12C07C265/14
Inventor 李会泉姚星星柳海涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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