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Method for producing amylene through 2-amyl alcohol dehydration

A technology of n-pentene and pentanol, applied in the field of dehydration of 2-pentanol to produce n-pentene, which can solve the problems of long process route and low purity of 1-pentene

Inactive Publication Date: 2018-05-29
SHANGHAI PEARLK CHEM MATERIALS CO LTD QIDONG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that the process route is long, specific raffinated C5 raw materials and product 1-pentene are low in purity

Method used

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  • Method for producing amylene through 2-amyl alcohol dehydration

Examples

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Comparison scheme
Effect test

Embodiment 1～10

[0016] 1. Dehydration reaction of 2-pentanol

[0017] The dehydration reaction is carried out in a tubular fixed-bed reactor with a size of φ25mm×1500mm. The reactor is filled with γ-Al with a particle size of 3-5mm 2 o 3 100 g of catalyst constitutes a fixed bed catalyst bed. The outside of the reactor is equipped with a temperature-controlled jacket of circulating heat-conducting oil, and platinum resistors for temperature measurement are respectively installed on the upper, middle and lower parts of the catalyst bed. The amount of reaction feed is controlled by a feed pump, and the system pressure is regulated by a back pressure valve.

[0018] 2-pentanol is reacted through a tubular fixed-bed reactor according to the set feed amount, and dehydration is carried out according to the set reaction conditions; 2-pentanol is converted into 1-pentene and 2-pentene through the dehydration reaction alkene; the dehydration reaction products obtained in Examples 1-10 were analyze...

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Abstract

The invention discloses a method for producing amylene through 2-amyl alcohol dehydration. The method includes the following steps that 1) 2-amyl alcohol is fed into a tubular fixed bed catalytic reactor and subjected to a dehydration reaction, a catalyst is gamma-Al2O3, the reaction temperature is 200 DEG C to 350 DEG C, the reaction pressure is 0.1 bar to 2.0 bar, the mass space velocity is 0.1hr<-1> to 2.0 hr<-1>, the 2-amyl alcohol is transferred into a mixture of 1-amylene and 2-amylene through dehydration; 2) boiling point differences of all components in dehydration materials are used,and the 1-amylene is separated out in a rectifying tower with the theoretical plate number of 80 to 100, the temperature of a tower kettle is 55 DEG C to 80 DEG C, the temperature of the tower top is40 DEG C to 60 DEG C, the reflux ratio is 10 to 30, and the tower operating pressure is 2 bar to 5 bar. The method has the advantages that the characteristics that boiling points of all the components in a dehydration product and the boiling point of the 1-amylene are obviously different are used, and therefore 1-amylene products with the purity of 99.5% or above can be produced through rectification.

Description

technical field [0001] The invention relates to a method for producing n-pentene by dehydration of 2-pentanol, in particular to passing 2-pentanol through γ-Al 2 o 3 The catalyst bed is used to dehydrate 2-pentanol into a mixture of n-pentene and 2-pentene, and then obtain n-pentene through separation. Background technique [0002] N-pentene is an intermediate of fine chemical products with relatively narrow application fields. It is the raw material for producing 1,2-pentanediol through epoxidation, and then producing the insecticide propiconazole. Propiconazole is a kind of green organic pesticide with good development prospects and minimal impact on the environment to replace organophosphorus pesticides. [0003] Usually, a considerable amount of C5 fraction is produced by the steam cracking of naphtha to produce ethylene, and its amount is about 10% of the ethylene output. At present, the comprehensive utilization of C5 fractions is mainly to separate C5 fractions to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C7/04C07C11/10
CPCC07C1/20C07C7/04C07C2521/04C07C11/10
Inventor 石康明
Owner SHANGHAI PEARLK CHEM MATERIALS CO LTD QIDONG
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