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Preparation of sec-butyl acetate

A technology of sec-butyl acetate and acetic acid, which is applied in the field of preparation of sec-butyl acetate, can solve the problems of low product purity, low selectivity, easy deactivation of catalysts, etc., and achieves high separation efficiency, simple process, and reduced superposition. product effect

Active Publication Date: 2009-07-22
HUNAN RUIYUAN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to overcome the defects in the preparation of sec-butyl acetate in the prior art that butene is converted into sec-butyl acetate in the acid alkene addition reaction, the selectivity is low, the catalyst is easily deactivated, and the product purity is not high, providing A sec-butyl acetate product that can effectively improve the selectivity of butene converted to sec-butyl acetate in the acid-ene addition reaction, thereby increasing the yield of the target product sec-butyl acetate, and the catalyst is not easy to deactivate, and the product purity is high preparation method

Method used

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preparation example Construction

[0030] The preparation method of sec-butyl acetate provided by the invention can be carried out continuously or batchwise. When the preparation method of the sec-butyl acetate is performed batchwise, preferably, the C 4 The method that olefin is contacted with acetic acid several times comprises adding all said acetic acid in the reaction vessel once, and then adding C 4 Olefin was added to the reaction vessel in portions. When the preparation method of the sec-butyl acetate is carried out in a continuous manner, preferably, as figure 1 shown, the C 4 The method that olefins are contacted with acetic acid several times comprises that all acetic acid is directly passed into the first reactor according to the material flow direction of acetic acid, and the C 4 The olefins are divided into several strands and passed into the first reactor and a plurality of reactors connected in series with the first reactor, so that C 4 Alkenes are contacted and reacted with acetic acid in m...

Embodiment 1

[0103] This embodiment is used to illustrate the preparation method of sec-butyl acetate provided by the invention.

[0104] In four fixed-bed reactors, 100 grams of resin-assembled cesium phosphotungstic acid salt catalyst (prepared according to the method of Example 1 disclosed by CN1781598A, the assembled amount of cesium phosphotungstic acid cesium salt is 19.8% by weight) is loaded into each of the four fixed-bed reactors, and acetic acid is The speed of 1093 grams / hour is continuously passed in the first fixed-bed reactor a1, C 4 Olefin mixture (mass composition: n-butane 36.2%, trans-butene 39.5%, n-butene 4.2%, butene 20.1%) is divided into four strands at 240 g / h, 240 g / h, 160 g / h, The speed of 160 g / h enters in the first fixed bed reactor a1, the second fixed bed reactor a2, the third fixed bed reactor a3 and the fourth fixed bed reactor a4, C 4 The total feed rate of olefin mixture is 800 g / h, acetic acid and C 4 The total molar ratio of olefins is 2. Circulating...

Embodiment 2

[0127] This embodiment is used to illustrate the preparation method of sec-butyl acetate provided by the invention

[0128] 100 grams of strongly acidic ion-exchange resin catalysts (sulfonated styrene-divinylbenzene type resins, total exchange capacity of 5.0mmolH + / g, the bulk density is 700g / L, and the specific surface area is 40m 2 / g, average pore diameter 30nm, pore volume 0.4mL / g), acetic acid is passed in the first fixed-bed reactor a1 continuously with the speed of 893 grams / hour, C 4 Olefin mixture (mass composition: isobutane 38.5%, n-butane 9.4%, trans-butene 20.1%, n-butene 17.5%, isobutene 0.5%, butene 13.7%, butadiene 0.3%) divided into four strands respectively Enter the first fixed-bed reactor a1, the second fixed-bed reactor a2, the third fixed-bed reactor a3 and the fourth fixed bed reactor a4, C 4 The total feed rate of olefin mixture is 800 g / h, acetic acid and C 4The molar ratio of the total amount of the olefin mixture was 2. Circulating water with...

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Abstract

The invention relates to a method for preparing sec-butyl acetate, which includes steps as follows: (1) with the existence of a catalyst and under the condition of addition reaction, C4 olefin contacts and reacts with acetic acid for a plurality of times; (2) the reaction products obtained in Step (1) are rectified and separated, C4 light components are obtained from the top of a tower and tower bottoms are obtained from the bottom of the tower; (3) the tower bottoms obtained in Step (2) and water are boiled and rectified, sec-butyl acetate and C8 olefin are obtained from the top of the tower in the form of azeotrope and acetic acid is obtained from the bottom of the tower; (4) the azeotrope obtained in Step (3) is condensed, oil and water separation is carried out and aqueous phase products and oil phase products containing C8 olefin and sec-butyl acetate are obtained; and (5) the oil phase products obtained in Step (4) and water are boiled and rectified, C8 olefin is obtained from the top of the tower in the form of azeotrope and sec-butyl acetate is obtained from the bottom of the tower. The method provided by the invention can obtain relatively high yield of sec-butyl acetate and can obtain sec-butyl acetate and recycle acetic acid at a relatively high purity.

Description

technical field [0001] The present invention relates to a kind of preparation method of sec-butyl acetate. Background technique [0002] Butyl acetate (including n-butyl acetate, sec-butyl acetate, isobutyl acetate and tert-butyl acetate) is an important class of organic chemicals and is widely used as a preparation for oils, resins, coatings, and paints. As well as an excellent organic solvent for organic reaction processes, extraction and separation processes, etc., it can also be used to prepare metal cleaning agents and spices. Especially in recent years, due to increasingly stringent environmental protection requirements, the use of solvents containing toxic substances such as benzene, toluene, and chlorinated hydrocarbons is gradually being restricted, and the amount of ester environmentally friendly solvents has increased sharply. Acetate products have become a hot seller in the market. product. At present, the butyl acetate products on the market are mainly n-butyl...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/04
Inventor 潘罗其甘健
Owner HUNAN RUIYUAN PETROCHEM
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