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Technology for continuously producing secbutyl acetate

A sec-butyl acetate and process technology, applied in the field of high-efficiency continuous production of sec-butyl acetate, can solve the problems of low raw material utilization rate, long reaction time, high production cost, etc., and achieve enhanced effective contact, uniform distribution, low production energy consumption and low cost effect

Inactive Publication Date: 2013-10-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis of sec-butyl acetate mostly uses tubular fixed-bed reactors or suspended stirred tank reactors. These old processes have problems such as low conversion rate, low utilization rate of raw materials, long reaction time, and high production cost.

Method used

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  • Technology for continuously producing secbutyl acetate

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Experimental program
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Effect test

Embodiment 1

[0034] The process flow is shown in Figure 1, wherein the volume of the reaction section of the jet collision flow tower reactor 3 is 6m 3 , with a diameter of 1.6m and a height of 3.2m; the tray / packed column reaction section 20 has a diameter of 1.0m and a height of 6m, and the ejector is provided by Shuanghong Engineering Technology Development Co., Ltd.

[0035] Acetic acid and butene are 1: 1.1 by the ratio of substance amount, join after pipeline 1 and mix with solid-liquid mixed acid catalyst (catalyst amount accounts for 10% of acetic acid mass) in catalyst feeding device 19 and join jet collision flow tower In reactor 3, butene enters jet collision flow tower reactor 3 from pipeline 2 through gas distributor 5, the reaction temperature is 110°C, the pressure is 0.8MPa (gauge pressure), and the solid catalyst is Amberlyst 15 (U.S.A. Rohm and Haas company production), liquid catalyst is sulfuric acid, wherein liquid acid accounts for 20% (the amount of H+ that liquid ac...

Embodiment 2

[0037] Adopt the reaction equipment identical with embodiment 1, be similar to embodiment 1 operation method, the mol ratio of acetic acid and butene is 1: 1.2, 120 ℃ of reaction temperatures, the pressure of jet collision flow tower reactor 5 is 1.2MPa (table pressure), the catalyst used is a solid-liquid mixed acid catalyst (catalyst amount accounts for 7% of the acetic acid quality), wherein the solid phase is a strongly acidic ion exchange resin Amberlyst 36 (produced by Rohm and Haas, USA), and the liquid catalyst is a pair of Toluenesulfonic acid, accounting for 50%. The conversion rate of acetic acid in this process is 94.5%, the content of butene in the gas after the reaction is 1.2%, and the production capacity is 1020kg / h.

Embodiment 3

[0039] Adopt the reaction equipment identical with embodiment 1, be similar to embodiment 1 operating method, the mol ratio of acetic acid and butene is 1: 0.8, 130 ℃ of reaction temperatures, the pressure of jet collision flow tower reactor 5 is 1.4MPa (table pressure), the catalyst used is a solid-liquid mixed acid catalyst (catalyst amount accounts for 5% of the acetic acid quality), wherein the solid phase is strongly acidic ion exchange resin Amberlyst 35 (produced by Rohm and Haas, USA), and the liquid catalyst is phosphoric acid , Phosphoric acid accounted for 40%. The conversion rate of acetic acid in this process is 91%, the content of butene in the gas after the reaction is 0.04%, and the production capacity is 970kg / h.

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Abstract

The invention discloses a technology for efficiently and continuously producing secbutyl acetate. In the technology, acetic acid and 1-butylene serve as raw materials, solid-liquid mixed acid serves as catalyst and an integrated system composed of an injection collision stream tower reactor, a rectification system, an oil-water separator and the like is adopted. Wherein the injection collision stream tower reactor is mainly composed of an injection-collision stream reaction section, a tower plate / filler tower-type reaction section, a forced circulation and control part and a catalyst replacing part, which greatly improves conversion rate of acetic acid and use ratio of butylene. The method for efficiently and continuously producing secbutyl acetate has the comprehensive advantages of compact structure, safety and reliability, high conversion rate, high material use ratio, low operation cost and the like.

Description

technical field [0001] The invention relates to a new process for efficiently and continuously producing sec-butyl acetate. Background technique [0002] Secondary butyl acetate is a colorless, flammable liquid with a fruity aroma. It is widely used in the paint, plastics, medicine and fragrance industries. It can also be used as an extractant, dehydrating agent and metal cleaning agent. The main synthetic method of sec-butyl acetate is two kinds of acid alcohol esterification method and olefin addition method, and the former synthetic method is exactly the esterification of acetic acid and sec-butyl alcohol, but the reaction speed of this method is slow, and reaction time is long, and product yield is low . The latter olefin addition method refers to the addition reaction of acetic acid and mixed C4 (or butene) under the action of an acid catalyst to directly synthesize sec-butyl acetate. This method directly utilizes olefin resources without alcohol as an intermediate, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/04
Inventor 张志炳刘勇周政耿皎孟为民王冠楠
Owner NANJING UNIV
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