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Method for recycling acetic acid sec-butyl ester from reaction product during preparation of acetic acid sec-butyl ester with high efficiency

A technology for sec-butyl acetate and reaction products, which is applied in the field of recovering sec-butyl acetate, and can solve problems such as the composition, yield and utilization of C8 olefins that are not mentioned

Active Publication Date: 2014-08-13
HUNAN RUIYUAN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In the patent disclosed by the applicant, the C8 olefins and sec-butanol that exist in the product are all mentioned, and the method of azeotropic distillation is also proposed to separate it from sec-butyl acetate to obtain high-purity sec-butyl acetate Esters, but there is no mention of the composition, yield and utilization of C8 olefins produced at the top of the tower during the azeotropic purification of ester products

Method used

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  • Method for recycling acetic acid sec-butyl ester from reaction product during preparation of acetic acid sec-butyl ester with high efficiency
  • Method for recycling acetic acid sec-butyl ester from reaction product during preparation of acetic acid sec-butyl ester with high efficiency

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Embodiment 1

[0034] Such as figure 1 As shown, according to the similar method and process conditions of Example 1 of the patent publication CN101486640A, the same catalyst was used to react the C4 olefin mixture with acetic acid. The reaction product extracted from the outlet of the reactor RT is passed into the C4 separation tower T1 for rectification and separation. The operating conditions of T1 include operating pressure of 0.5 MPa, tower top temperature of 40°C, tower bottom temperature of 180°C, reflux ratio of 0.8, and T1’s The number of theoretical trays is 20, and C4 light components are extracted from the top of the tower, which can be returned to the C4 olefin feed pipe of the reactor. The tower bottom product that extracts at the bottom of C4 separation tower T1 tower is passed continuously in the azeotropic tower T2 together with the water as entrainer and carries out azeotropic rectification, and the operation condition of T2 comprises that operating pressure is normal press...

Embodiment 2

[0038]According to the similar method and process conditions of Example 1 of the patent publication CN101486640A, the same catalyst was used to react the C4 olefin mixture with acetic acid. The reaction product extracted from the outlet of the reactor is passed into the C4 separation tower T1 for rectification and separation. The operating conditions of T1 include operating pressure 0.5MPa, tower top temperature 40°C, tower bottom temperature 180°C, reflux ratio 0.8, T1 theory The number of trays is 20, and C4 light components are extracted from the top of the tower, which can be returned to the C4 olefin feed pipe of the reactor. The tower bottom product that extracts at the bottom of C4 separation tower T1 tower is passed continuously in the azeotropic tower T2 together with the water as entrainer and carries out azeotropic rectification, and the operation condition of T2 comprises that operating pressure is normal pressure (0.1MPa), tower The top temperature is 85°C, the bo...

Embodiment 3

[0040] According to the similar method and process conditions of Example 1 of the patent publication CN101486640A, the same catalyst was used to react the C4 olefin mixture with acetic acid. The reaction product extracted from the outlet of the reactor is passed into the C4 separation tower T1 for rectification and separation. The operating conditions of T1 include operating pressure 0.5MPa, tower top temperature 40°C, tower bottom temperature 180°C, reflux ratio 0.8, T1 theory The number of trays is 20, and C4 light components are extracted from the top of the tower, which can be returned to the C4 olefin feed pipe of the reactor. The tower bottom product that extracts at the bottom of C4 separation tower T1 tower is passed continuously in the azeotropic tower T2 together with the water as entrainer and carries out azeotropic rectification, and the operation condition of T2 comprises that operating pressure is normal pressure (0.1MPa), tower The top temperature is 85°C, the b...

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Abstract

The invention provides a method for recycling acetic acid sec-butyl ester from a reaction product during preparation of the acetic acid sec-butyl ester with high efficiency. The method for recycling the acetic acid sec-butyl ester from the reaction product during preparation of the acetic acid sec-butyl ester with high efficiency comprises the following steps: directly feeding acetic acid sec-butyl ester material into an impurity removing azeotropic tower, wherein the acetic acid sec-butyl ester material is discharged outside as byproduct from the top of an ester product purification tower and contains water, C8 olefin and sec-butyl alcohol impurities, removing water, C8 olefin and part sec-butyl alcohol which are contained in the acetic acid sec-butyl ester material at the top of the impurity removing azeotropic tower while the contained water is taken as entrainer, and feeding a product at the bottom of the tower into an ester product refining tower for recycling. The method for recycling the acetic acid sec-butyl ester from the reaction product during preparation of the acetic acid sec-butyl ester with high efficiency has the advantages of simple process, low energy consumption, high separation efficiency, and more than 92% of the acetic acid sec-butyl ester in the byproduct can be recycled.

Description

technical field [0001] The present invention relates to a kind of method that reclaims sec-butyl acetate from the reaction product of preparing sec-butyl acetate with high yield, more precisely, it is a kind of method about from the sec-butyl acetate mixture containing C8 olefin and sec-butanol In the process, azeotropic distillation and re-refining are used to recover sec-butyl acetate. technical background [0002] In recent years, due to increasingly stringent environmental protection requirements, the use of toxic solvents such as benzene, toluene, and chlorinated hydrocarbons is gradually being restricted, and the amount of environmentally friendly solvents such as esters is increasing sharply. Acetate products have become hot products in the market. Second-butyl acetate is an isomer of n-butyl acetate in acetates. The properties of the two are similar. It is an important organic chemical and can be widely used as oil, resin, coating, paint, reaction process, extraction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54
CPCC07C67/54C07C69/14
Inventor 甘健李园园张杰刘成
Owner HUNAN RUIYUAN PETROCHEM
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