A kind of continuous gas-phase hydrogenation of methyl acrylate to methyl propionate technology

A technology for producing methyl acrylate and methyl propionate, which is applied in the preparation of carboxylic acid esters, the preparation of organic compounds, organic chemistry, etc., and can solve the problems of product yield reduction, self-polymerization blockage of reactors and hydrogenation system pipelines, and self- Polymerization and other problems, to reduce the risk of side reactions, protect the sintering deactivation, the effect of reasonable process design

Active Publication Date: 2022-04-26
SOUTHWEST RES & DESIGN INST OF CHEM IND
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, methyl acrylate has a C=C double bond, and self-polymerization is very easy to occur in the liquid phase state. The liquid-phase preheating feed hydrogenation process in the existing reports is very prone to self-polymerization to block the reactor and the hydrogenation system pipeline.
On the other hand, the hydrogenation of methyl acrylate is a strong exothermic reaction, and the adiabatic temperature rise of gas-phase hydrogenation can reach more than 100°C, which can easily cause the catalyst to be deactivated by sintering, or cause side reactions to reduce the product 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 continuous gas-phase hydrogenation of methyl acrylate to methyl propionate technology
  • A kind of continuous gas-phase hydrogenation of methyl acrylate to methyl propionate technology
  • A kind of continuous gas-phase hydrogenation of methyl acrylate to methyl propionate technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 As shown, the process consists of the following key equipment and steps:

[0041]Key equipment includes vaporization tower, reactor, cycle gas preheater, methyl acrylate preheater (MA preheater), condenser, and cycler.

[0042] The mass fraction is 47% methyl acrylate, 53% methanol mixture, enter the MA preheater to preheat to 60 ℃, fresh H 2 with cycle H 2 After mixing, it is preheated to 70°C by the circulating gas preheater, and the gas and liquid phase materials enter the vaporization tower together, and the polymerization inhibitor hydroquinone is intermittently fed according to the content of the tower bottom, and the content of the polymerization inhibitor in the bottom bottom of the vaporization tower is controlled At 200ppm, the vaporizer pressure is maintained at 1MPa. The 1.5MPa (G) steam is used to supply heat to the bottom of the vaporization tower to vaporize methyl acrylate and methanol, and the vaporized mixture at 80°C is discharged ...

Embodiment 2

[0055] Key equipment includes vaporization tower, reactor, cycle gas preheater, methyl acrylate preheater (MA preheater), condenser, and cycler.

[0056] A mixture of methyl acrylate and 53% methyl propionate with a mass fraction of 47% enters the MA preheater to preheat to 60°C, fresh H 2 with cycle H 2 After mixing, it is preheated to 70°C by the circulating gas preheater, and the two streams of gas and liquid phase materials enter the gasification tower together. Controlled at 200ppm, the vaporizer pressure is maintained at 1MPa. The 1.5MPa (G) steam is used to supply heat to the bottom of the vaporization tower to vaporize methyl acrylate and methyl propionate, and the vaporized mixture at 80°C is discharged from the top of the tower.

[0057] Table 4 Feed Composition of Evaporation Tower

[0058]

[0059] The gasified gas phase components enter the tube side of the isothermal tube reactor with a space velocity of 2000 / h, and the reactor bed temperature is controlled...

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 relates to a process for producing methyl propionate through continuous gas-phase hydrogenation of methyl acrylate. The process is: pump methyl acrylate, methanol or methyl propionate containing a small amount of polymerization inhibitor into the vaporization tower, and after vaporization, the same H 2 Together into the isothermal tubular reactor for hydrogenation. Hydrogenation outlet product is used for preheating feedstock and H 2 , and enter the gas-liquid separator after further condensation. In the gas-liquid separator, methanol or methyl propionate, product methyl propionate and trace methyl acrylate liquid phase components are separated, and the H 2 It is a gas phase component whose main component contains a small amount of methanol or methyl propionate and methyl propionate. The gas phase enters the preheater and vaporization tower in turn, and is recycled back to the reactor. This process effectively solves the problem of methyl acrylate self-polymerization, avoids equipment and pipeline blockage, and at the same time solves the problem of side reactions and catalyst sintering caused by the strong heat release of methyl acrylate hydrogenation, and provides a stable and efficient continuous process of methyl acrylate Gas-phase hydrogenation to methyl propionate technology.

Description

technical field [0001] The patent of the invention relates to the technical field of chemical technology and catalytic hydrogenation, in particular to a process for producing methyl propionate by continuous gas-phase hydrogenation of methyl acrylate. Background technique [0002] Methyl propionate is an important chemical raw material, which can be used as a solvent for nitrocellulose, nitro spray paint, paint, varnish, etc. It can also be used as a solvent for spices and seasonings, and can also be used as an intermediate in organic synthesis. Recent studies also reported the synthesis of methyl methacrylate from methyl propionate. [0003] Patent CN106674010A proposes to use methyl propionate as raw material to react with formaldehyde to obtain methyl methacrylate process. Patent CN110981727A proposes to react acetic acid and its ester with formaldehyde to obtain methyl acrylate, methyl acrylate is hydrogenated to obtain methyl propionate, and methyl propionate undergoes ...

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): C07C67/303C07C69/24
CPCC07C67/303C07C69/24
Inventor 王雪峰宋元江李文龙李扬
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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