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Environment-friendly and simple preparation method for synthesizing isophorone from acetone

A technology of isophorone and acetone, which is applied in the field of environmentally friendly and simple preparation of isophorone from acetone, can solve the problems of restricting the development of isophorone industrialization, unfavorable environmental protection, and low conversion rate of acetone, and meet the needs of market products Quality requirements, conducive to industrialization and automation, and the effect of generating scale that is easy to control

Inactive Publication Date: 2013-03-20
张锦碧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above literature that the liquid phase condensation method has the advantages of simple catalyst, easy operation, and high yield of isophorone, and is especially suitable for industrial production. However, the disadvantage is that the conversion rate of acetone is not high (20-40%), and repeated production consumes energy. Large, the reaction time is relatively long, the production cost is increased, and a large amount of waste liquid is generated, which is not conducive to environmental protection
[0008] In the heterogeneous catalytic condensation method of solid catalysts, magnesium and aluminum mixed oxides, magnesium-aluminum composite oxides or magnesium-aluminum hydrotalcites are commonly used as solid catalysts, which are made in a fixed bed reactor. The acetone conversion rate of this method is as high as 50%, but the developed catalyst has shortcomings such as short life, difficult regeneration, complicated preparation process, high cost, etc., and the temperature required for the conditions is relatively high (200~400°C), energy consumption is large, and the selectivity of isophorone is low
Thereby also restricting the development of isophorone industrialization

Method used

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  • Environment-friendly and simple preparation method for synthesizing isophorone from acetone

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Experimental program
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Effect test

Embodiment 1

[0021] Put 1000Kg of acetone as raw material, 100Kg of NaOH aqueous solution containing 3 Kg of catalyst, 0.2 Kg of auxiliary catalyst magnesium oxide, aluminum oxide, calcium oxide, barium oxide, and lanthanum rare metal element into the autoclave, heat to 130°C, and rotate at 250 rpm. The reaction was continuously stirred at constant temperature for 2 hours, then cooled to 80°C, and the unreacted acetone was distilled and cooled to reflux for next use. After the root of the kettle is static, the liquid is separated, and the catalyst aqueous solution is released for use next time, and the remaining product is distilled under reduced pressure to obtain the finished product by distilling the isophorone.

[0022] The product composition after reaction is:

[0023] Acetone 756Kg

[0024] Diacetone Alcohol 40Kg

[0025] Mesityl oxide 105Kg

[0026] Isophorone 142Kg

[0027] Water 45Kg

[0028] Other high boiling substances 12Kg

[0029] Using such a preparation method, the c...

Embodiment 2

[0031] Put 1000Kg of raw material acetone, 100Kg of NaOH aqueous solution containing 3 Kg of catalyst, 0.2 Kg of auxiliary catalyst magnesium oxide, aluminum oxide, calcium oxide, barium oxide and lanthanum rare metal element into the autoclave, heat to 150°C, and rotate at 250 rpm. The reaction was continuously stirred at constant temperature for 2 hours, then cooled to 80°C, and the unreacted acetone was distilled and cooled to reflux for next use. After the root of the kettle is static, the liquid is separated, and the catalyst aqueous solution is released for use next time, and the remaining product is distilled under reduced pressure to obtain the finished product by distilling the isophorone.

[0032] The product composition after reaction is:

[0033] Acetone 447Kg

[0034] Diacetone Alcohol 31Kg

[0035] Mesityl oxide 56Kg

[0036] Isophorone 355Kg

[0037] Water 97Kg

[0038] Other high boiling substances 14Kg

[0039] Using such a preparation method, the conver...

Embodiment 3

[0041] Put 1000Kg of acetone as the raw material, 100Kg of NaOH aqueous solution containing 3 Kg of catalyst, 0.2 Kg of auxiliary catalyst magnesium oxide, aluminum oxide, calcium oxide, barium oxide and lanthanum rare metal element into the autoclave, heat to 200°C, and rotate at 250 rpm. The reaction was continuously stirred at constant temperature for 2 hours, then cooled to 80°C, and the unreacted acetone was distilled and cooled to reflux for next use. After the root of the kettle is static, the liquid is separated, and the catalyst aqueous solution is released for use next time, and the remaining product is distilled under reduced pressure to obtain the finished product by distilling the isophorone.

[0042] The product composition after reaction is:

[0043] Acetone 430Kg

[0044] Diacetone Alcohol 15Kg

[0045] Mesityl oxide 54Kg

[0046] Isophorone 280Kg

[0047] Water 125Kg

[0048] Other high boiling substances 96Kg

[0049] Using such a preparation method, th...

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Abstract

The invention relates to an environment-friendly and simple preparation method for synthesizing isophorone from acetone. The method is based on a liquid condensation method and comprises the steps of pouring acetone and a strong alkaline catalyst sodium hydroxide aqueous solution or a strong alkaline catalyst potassium hydroxide aqueous solution in an autoclave; adding microscale auxiliary catalysts of magnesium oxide, aluminum oxide, calcium oxide, barium oxide and a rare metal element of lanthanum; changing a reaction condition to lower reaction activation energy; heating to a temperature of 150 DEG C; reacting for 2 hours at a constant temperature with continuously stirring; cooling to a temperature of 80 DEG C; distilling and refluxing the unreacted acetone for use in the next time; standing residues in the autoclave; separating the liquid and draining out the aqueous solution for use in the next time; distilling the remained materials; and distilling the isophorone out to obtain a finished product. With the method, the formation of high-boiling residues and other by-products is reduced; conversion rate of acetone is increased; and selectivity for isophorone is increased. The environment-friendly and simple preparation method is short in reaction time, low in reaction temperature and simple and environment-friendly in process, and can meet modern requirements and realized production automation and production industrialization.

Description

technical field [0001] The invention relates to the field of industrial production, in particular to an environmentally friendly and simple preparation method for synthesizing isophorone from acetone. Background technique [0002] Isophorone, also known as 3,5,5-trimethyl-2-cyclohexen-1-one, is an important high-boiling solvent with strong dissolving ability and wide application. It is a good choice for polymer materials. solvent. At present, the production and consumption of isophorone are mainly in developed countries such as Britain, France, Germany, and the United States. There is no industrialized production of isophorone in my country, and only a few solvent companies are doing small-scale pilot research. [0003] There are two mature processes for synthesizing isophorone: the mesityl oxide method and the acetone condensation method. Among them, the mesityl oxide method is difficult for industrial production due to the high price of raw materials and high product cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/603C07C45/74
Inventor 不公告发明人
Owner 张锦碧
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