A kind of method that 2-pentanol dehydration produces pentene

Abstract

A method for dehydrating 2-pentanol to produce pentene, comprising the following steps: 1) sending 2-pentanol into a fixed-bed reactor for dehydration reaction, and the catalyst is γ-Al 2 o 3 ;The reaction temperature is 200~350℃, the reaction pressure is 0.1~2.0bar, and the mass space velocity is 0.1~2.0hr ‑1 ; Conversion of 2-pentanol to a mixture of 1-pentene and 2-pentene by dehydration. 2) Using the boiling point difference of each component in the dehydrated material, separate 1-pentene in a rectification tower with a theoretical plate number of 80-100; 60°C, the reflux ratio is 10-30, and the operating pressure of the tower is 2-5 bar. 3) Send the above-mentioned tower bottom liquid into a rectification tower with a theoretical plate number of 80 to 100 to separate 2-pentene; is 10-30, and the operating pressure of the tower is 2-5 bar. The invention has the advantage of producing 1-pentene and 2-pentene products with a purity of more than 99.5% through dehydration and rectification.

Description

technical field [0001] The present invention relates to a kind of method that 2-pentanol is dehydrated to produce pentene, particularly relate 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 1-pentene and 2-pentene products through rectification and separation. Background technique [0002] 1-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 green organic pesticide with good development prospects and minimal impact on the environment to replace organophosphorus pesticides; 2-pentene is an important organic chemical raw material, which can be used to produce 2-pentanol and Raw material for 3-pentanol and used as a polymerization inhibitor. [0003] Usually, a considerable amount of C5 fra...

AI Technical Summary

Problems solved by technology

Because the carbon five components contained in raffinate carbon five are more and the boiling points of each component are very close, so although the mode of precision rectification is adopted to produce 1-pentene and 2-pentene, the purity of the obtained product is relatively low. Unable to obtain 1-pentene and 2-pentene products with a content above 99.5%

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