Preparation method of isophorone

A technology of isophorone and mesityl oxide, applied in the field of basic chemical industry, can solve the problems of low conversion rate, high energy consumption, large material loss, etc., and achieve the improvement of product yield, solvent avoidance, and mild reaction process conditions Effect

Active Publication Date: 2013-12-25
JIANGSU HUANXIN NEW MATERIAL CO LTD
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Problems solved by technology

[0006] It can be seen that the conversion rates of the above invention patents are all low, and the selectivity can be further improved with the help of post-processing equipment, but repeated processing for many times will cause a large loss of materials and extremely high energy consumption.

Method used

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  • Preparation method of isophorone

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preparation example Construction

[0026] The invention provides a kind of preparation method of isophorone, comprises the following steps:

[0027] (1) Acetone is continuously fed into the first reaction tower 1 for condensation reaction to generate diacetone alcohol mixed liquid;

[0028] (2) After the diacetone alcohol mixture flows out of the first reaction tower 1, it flows into the heat exchanger 3 through the feed pump 2 and heats up to cause a dehydration reaction of diacetone alcohol to generate a mixture of acetone and mesityl oxide;

[0029] (3) Put the mixture of acetone and mesityl oxide and the rest of the diacetone alcohol mixture together with the catalyst into the second reaction tower 4 for reaction, and after cooling the prepared reaction liquid, separate the gas phase , an oil phase and an aqueous phase, the oil phase is an isophorone synthetic liquid; and

[0030] (4) The isophorone synthesis solution is neutralized and rectified to obtain the finished isophorone.

[0031] In order to mak...

Embodiment 1

[0053] see figure 1 , figure 1 It is a schematic diagram of equipment for a preparation method of isophorone of the present invention. Such as figure 1 As shown, under continuous steady-state conditions, acetone at 1m 3 The flow rate of / h is continuously sent to the first reaction tower 1, and the acetone is heated and vaporized by the heat exchanger of the first reaction tower 1, and the condensation reaction occurs in the stripping section to the reaction section to generate diacetone alcohol, and the unreacted acetone continues to pass through the rectification section It is condensed by the top condenser and returned to the first reaction tower 1 to continue the reaction. The diacetone alcohol produced by the reaction has a high boiling point and is easy to dehydrate to generate mesityl oxide, and it will gradually go down to the bottom of the tower to enrich. After a period of reaction, the content of diacetone alcohol at the bottom of the tower and the mesityl oxide...

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Abstract

The invention discloses a preparation method of isophorone. The preparation method comprises the following steps: continuously sending acetone into a first reaction tower to perform a condensation reaction so as to generate a diacetone alcohol mixed solution; enabling the diacetone alcohol mixed solution to flow out of the first reaction tower and then flow into a heat exchanger through a charging pump to heat and perform a diacetone alcohol dehydration reaction so as to generate a mixture of the acetone and mesityl oxide; placing the mixture of the acetone and the mesityl oxide, the remaining diacetone alcohol mixed solution and a catalyst into a second reaction tower together for reaction, cooling a prepared reaction solution, and separating out a gas phase, an oil phase and a water phase, wherein the oil phase is an isophorone synthetic solution; and neutralizing and rectifying the isophorone synthetic solution to get the finished product isophorone. According to the preparation method, the use of solvents is avoided, the reaction process conditions are mild and easy to control, and the product yield is obviously increased in comparison with that of the prior art.

Description

technical field [0001] The invention belongs to the field of basic chemical industry, in particular to a preparation method of isophorone. Background technique [0002] Isophorone (Isophorone, ISO) is a condensation product of acetone, its chemical name: 3,5,5-trimethyl-2-cyclohexen-1-one, molecular formula: C9H14O, molecular weight: 138.21, colorless appearance Or light yellow transparent liquid, with high boiling point, low hygroscopicity, good dissolving ability, dispersibility and leveling property, it is a good solvent for polymer materials, and can dissolve nitrocellulose, acrylate, alkyd resin, polyester and epoxy resin etc. Due to its unsaturated structure, the double bond can be further reacted to produce important products such as alcohols, acids, amines, esters and isocyanates, which are widely used in plastics, pesticides, medicines, coatings and other industries. Isocyanate can be obtained from isophorone by addition, hydrogenation and phosgenation, and it is ...

Claims

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Application Information

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IPC IPC(8): C07C49/603C07C45/74
Inventor 陈健明崔迎祥姚震朱汉文颜勇朱建军
Owner JIANGSU HUANXIN NEW MATERIAL CO LTD
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