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Method for continuously producing acetic acid isopentenyl ester

A technology of isopentenyl acetate and its production method, which is applied to the preparation of carboxylate esters, chemical instruments and methods, and the preparation of organic compounds, which can solve the problems of low reaction yields, increase reaction yields, and reduce environmental pollution Effect

Active Publication Date: 2013-10-02
SHANGHAI PEARLK CHEM
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  • Description
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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

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

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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...

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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; prenol can be oxidized to prenyl aldehyde, and prenyl aldehyde can be condensed and rearranged with prenol to produce citral, which is used as a raw material for vitamin A and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/04C07C69/145
Inventor 石康明
Owner SHANGHAI PEARLK CHEM
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