Method for continuously producing acetic acid isopentenyl ester

A technology of prenyl acetate and production method, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as low reaction yield, improve reaction yield and reduce environmental pollution Effect

Active Publication Date: 2015-07-22
SHANGHAI PEARLK CHEM
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But while esterification reaction, phosphoric acid catalyst catalyzes the dimerization reaction of isoprene equally, makes the reaction yield of above-mentioned method lower

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 continuously producing acetic acid isopentenyl ester
  • Method for continuously producing acetic acid isopentenyl ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0018] The esterification reaction is carried out in an acid-resistant stainless steel tubular fixed-bed reactor with a size of φ25mm×1500mm. 100 grams of Zn(AC) with a particle size of 2.5 mm are charged into the reactor 2 / C catalyst, constituting a fixed bed catalyst bed, Zn(AC) 2 The load on the carrier is 38.0-39.8% of the total mass of the catalyst. An electric heating temperature control system is installed outside the reactor, and platinum resistors for temperature measurement are respectively installed on the upper, middle and lower parts of the catalyst bed. The feeding amount of the raw materials prepared by isoprene and acetic acid is controlled by the feed pump, and the system pressure is regulated by the back pressure valve.

[0019] The reaction materials of the esterification reaction pass through the fixed bed according to the set feed amount, and carry out the esterification reaction according to the set reaction conditions. The reaction product obtained i...

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
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for continuously producing acetic acid isopentenyl ester. The method comprises the following steps: after the evaporation of isoprene and acetic acid, performing an esterification reaction through a fixed bed catalyst bed composed of granular Zn(AC)2 / C continuously so that the isoprene and the acetic acid are converted into acetic acid isopentenyl ester in a reactor. The mole ratio of the acetic acid to the isoprene is 0.2-2.0; the gaseous hourly space velocity (GHSV) is 100-500 hr<-1>, the reaction temperature is 120-200 DEG C, and the reaction pressure is 0.12-0.15 MPa (absolute pressure); and a Zn(AC)2 / C catalyst is adopted in the reaction, wherein coal active carbon with a specific area of 800-100 m<2> / g and a pore volume of 0.4-0.8 ml / g is used as a carrier, and the carrying capacity of Zn(AC)2 on the carrier is 38.0-39.8% of total mass of the catalyst. The method has the advantages that the reaction yield is obviously improved and the environmental pollution in the production process is greatly reduced.

Description

technical field [0001] The present invention relates to a kind of method of continuous production isopentenyl acetate, particularly relate to isoprene, acetic acid are passed continuously by granular Zn(AC) 2 The fixed-bed catalyst bed layer that / C constitutes carries out esterification, and the method for high-yield production isopentenyl acetate. Background technique [0002] Prenyl acetate is an important intermediate in the production of fragrances and pesticides, and is mainly used to produce prenyl alcohol through transesterification. Prenol reacts with trimethyl orthoacetate or ethyl acetate to synthesize methyl or ethyl perethinate, which is the key intermediate for the preparation of pyrethroids, homo-cis-permethrin (DV-chrysanthemic acid or chrysanthemic acid ester). Important raw material; Prenyl alcohol can be oxidized to obtain prenyl aldehyde, and prenyl aldehyde can be condensed and rearranged with prenyl alcohol to produce citral, which is used as a raw mat...

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): C07C67/04C07C69/145
Inventor 石康明
Owner SHANGHAI PEARLK CHEM
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