Method for preparing cyclopentanone from adipic acid

A technology of cyclopentanone and adipic acid, which is applied in the field of production of cyclopentanone from adipic acid, can solve the problems of high unit consumption of adipic acid, decreased yield of cyclopentanone, and hard slag in the kettle, and achieves Low unit consumption, save cleaning time and improve efficiency

Active Publication Date: 2013-04-17
HUAIAN WAN BANG SPICE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the self-polymerization and multi-polymerization of cyclopentanone and the carbonization of organic matter, the yield of cyclopentanone decreases, and the unit consumption of adipic acid is relatively high. Currently, the unit consumption is gen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Composite catalyst preparation: Mix 5 kg of stannous oxide, 10 kg of borax, 35 kg of strontium carbonate, and 2.5 kg of sodium dodecylbenzenesulfonate evenly.

[0028] Put 500kg of heat-conducting oil into the reactor, stir, raise the temperature to 100°C, slowly add 50kg of composite catalyst, continue to raise the temperature to 250°C, and continuously drop the melted adipic acid at a rate of about 40kg per hour. The reaction temperature is between 250°C and 260°C. The cyclopentanone and water produced by the reaction are condensed and collected as water ketone, and the carbon dioxide gas produced by the reaction is condensed and discharged at high altitude. About 27.5kg of water ketone is collected per hour, and the content of cyclopentanone in water ketone is 98.3%. Feed continuously for 35 days, the current of the stirring motor increases significantly, stop feeding, and when there is no material in the kettle, reduce the temperature of the kettle to about 50°C, n...

Embodiment 2

[0032] Composite catalyst preparation: Mix 5kg of stannous oxide, 10kg of borax, 40kg of strontium carbonate, and 2.5kg of sodium dodecylbenzenesulfonate evenly.

[0033] Put 500kg of heat-conducting oil into the reaction kettle, stir, raise the temperature to 100°C, slowly add 55kg of composite catalyst, continue to raise the temperature to 250°C, and continuously drop the melted adipic acid at a rate of about 40kg per hour. The reaction temperature is between 250°C and 260°C. The cyclopentanone and water produced by the reaction are condensed and collected as water ketone, and the carbon dioxide gas produced by the reaction is condensed and discharged at high altitude. About 27.6kg of water ketone is collected per hour, and the content of cyclopentanone in water ketone is 98.1%. Feed continuously for 35 days, the current of the stirring motor increases significantly, stop feeding, and when there is no material in the kettle, reduce the temperature of the kettle to about 50°...

Embodiment 3

[0037] Composite catalyst preparation: Mix 5 kg of stannous oxide, 10 kg of borax, 30 kg of strontium carbonate, and 2.5 kg of sodium dodecylbenzenesulfonate evenly.

[0038] Put 500kg of heat-conducting oil into the reaction kettle, stir, raise the temperature to 100°C, slowly add 45kg of composite catalyst, continue to raise the temperature to 250°C, and continuously drop the melted adipic acid at a rate of about 40kg per hour. The reaction temperature is between 250°C and 260°C. The cyclopentanone and water produced by the reaction are condensed and collected as water ketone, and the carbon dioxide gas produced by the reaction is condensed and discharged at high altitude. About 27.4kg of water ketone is collected per hour, and the content of cyclopentanone in water ketone is 98.2%. Feed continuously for 35 days, the current of the stirring motor increases significantly, stop feeding, and when there is no material in the kettle, reduce the temperature of the kettle to about...

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Abstract

The invention discloses a method for preparing cyclopentanone from adipic acid. The method comprises the following steps: (1) filling heat conduction oil in a reaction kettle, stirring, slowly adding a composite catalyst after heating to 100 DEG C, continuously dropping melted adipic acid after continuously heating to 250 DEG C, and controlling the reaction temperature to be 250 to 260 DEG C during the dropping process; (2) after condensing cyclopentanone generated during the reaction and water, collecting the condensed matter as hydrated ketone, and exhausting CO2 gas generated during the reaction from high altitude after being condensed; and (3) rectifying hydrated ketone obtained in the step (2) at normal pressure after being neutralized and salted out through sodium bicarbonate and sodium chloride to obtain a cyclopentanone finished product. The composite catalyst is prepared by mixing stannous oxide, borax, strontium carbonate and sodium dodecyl benzene sulfonate according to the mass ratio of 1:2:(6-8):0.05. According to the invention, the composite catalyst is adopted, so that the yield of cyclopentanone is improved, the polymerization and the carbonization of organic matters such as cyclopentanone and the like are reduced, produced hydrated ketone can reach more than 98%, and the unit consumption of adipic acid is low.

Description

technical field [0001] The invention relates to a production method of cyclopentanone, in particular to a production method for preparing cyclopentanone with adipic acid. Background technique [0002] Cyclopentanone (English name: Cyclopentanone) is a colorless liquid with an odor similar to peppermint oil. Molecular formula is C 5 h 8 O, molecular weight 84.12, melting point -58.2°C, boiling point 130.6°C, miscible with alcohol and ether. Easy to polymerize, especially in the presence of trace amounts of acid. Cyclopentanone is an important fine chemical intermediate, which is widely used as an intermediate for solvents, medicines, spices, synthetic rubber, and pesticides. For pesticides. [0003] The industrial production methods of cyclopentanone mainly include cyclopentanol dehydrogenation method, cyclopentene oxidation method, adipic acid cyclization method, etc. At present, adipic acid cyclization method is basically used in China. [0004] The cyclization of ad...

Claims

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Application Information

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IPC IPC(8): C07C49/395C07C45/48
Inventor 陈文抗
Owner HUAIAN WAN BANG SPICE IND CO LTD
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