Method for preparing 3-methyl-2-buten-1-ol through transesterification reaction of isopentenyl acetate

A technology for the transesterification of prenyl acetate and prenol, which is applied in the field of transesterification of prenyl acetate to prepare prenyl alcohol

Active Publication Date: 2018-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are few reports in the literature that the use of solid acid catalysts to catalyze the transesterification of prenyl acetate to prenol

Method used

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  • Method for preparing 3-methyl-2-buten-1-ol through transesterification reaction of isopentenyl acetate
  • Method for preparing 3-methyl-2-buten-1-ol through transesterification reaction of isopentenyl acetate

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Effect test

Embodiment 1

[0022] Embodiment 1 (comparative example)

[0023] The catalyst is CeO purchased from Sinopharm 2 , using a batch reactor, the catalytic reaction conditions are: 0.5g of prenyl acetate is mixed with 1.0mL of methanol, 50mg of catalyst is added, the reaction temperature is 140°C, the reaction pressure is 4Mpa, and the reaction time is 1.5h;

Embodiment 2

[0025] The catalyst is CeO 2 The carrier is loaded with precious metal Ir (Ir mass fraction is 2%). The specific preparation process is: impregnating the incipient wetness of a well-proportioned aqueous solution of chloroiridic acid onto the carrier for 24 hours, drying in an oven at 80°C for 12 hours, and drying in a muffle furnace. Calcined at 350°C for 2 hours to produce 2% Ir / CeO 2 solid acid catalyst. The prepared catalyst was reduced at 350° C. for 2 h under a hydrogen atmosphere. The reaction conditions are as follows: 0.5 g of prenyl acetate is mixed with 1.0 mL of methanol, 50 mg of catalyst is added, the reaction temperature is 140° C., the reaction pressure is 4 Mpa, and the reaction time is 1.5 h.

Embodiment 3

[0026] Embodiment 3 (comparative example)

[0027] Carrier CeO 2 Change to TiO 2 , other conditions are the same as in example 2.

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Abstract

The invention relates to a method for preparing 3-methyl-2-buten-1-ol through a transesterification reaction of isopentenyl acetate. The method is characterized in that a transesterification reactionis catalyzed by adopting a solid acid catalyst. The solid acid catalyst is one or more selected from the following components: a composite oxide consisting of ceric oxide and one or two selected fromsilicon dioxide and aluminum trioxide, and a supported noble metal catalyst taking one or more selected from the composite oxide and ceric oxide as a carrier, wherein the noble metal component is oneor more selected from iridium, gold and rhodium, the supported noble metal catalyst contains or does not contain an auxiliary agent, and the auxiliary agent is one or two selected from iron or cobalt.According to the synthetic method adopted by the invention, under the catalysis of the prepared solid acid catalyst, the 3-methyl-2-buten-1-ol can be generated through high-conversion-rate high-selectivity transesterification of isopentenyl acetate and methanol under a certain pressure and temperature.

Description

technical field [0001] The invention relates to a method for preparing prenyl alcohol through transesterification of prenyl acetate. Background technique [0002] Prenol, whose scientific name is 3-methyl-3-buten-1-ol, is a colorless oily liquid, and is an important intermediate of medicine, pesticide and fragrance. In the traditional industrial field, it is mainly used to produce isophytol, DV permethrin, citral and its downstream products, etc. In recent years, the new use is to synthesize the third generation cement water reducer and polycarboxylate water reducer The raw material TPEG etc. [0003] The synthesis route of preparing isopentenol by transesterification of isoenyl acetate has simple process conditions, mild reaction conditions, few by-products, low production cost, and is environmentally friendly. It is an efficient and economical synthesis method. The specific reaction See the formula below: [0004] [0005] Solid acid catalyst is the most widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/46B01J23/52B01J23/89B01J23/10B01J23/83B01J37/02B01J37/08C07C27/02C07C33/03C07C67/03C07C69/14
CPCB01J23/002B01J23/10B01J23/462B01J23/468B01J23/52B01J23/63B01J23/83B01J23/894B01J37/0201B01J37/08C07C29/1285C07C67/03C07C33/03C07C69/14
Inventor 王爱琴孙永南苗治理梁观峰张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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