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Method for producing 2-alkylidene cyclopentanone

A technology of alkylene cyclopentanone and cyclopentanone, applied in the field of fine chemicals of chemical engineering, can solve problems such as energy waste, waste, and reduced reaction selectivity

Active Publication Date: 2010-02-24
河南蔚源生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This catalytic system will cause many side reactions at the same time during the reaction process, and produce many high-boiling point by-products that are almost useless, resulting in a reduction in reaction selectivity, and due to the use of acid-base solution catalysts, neutralization operations are required after the reaction. A large amount of waste water will be generated, and the catalyst cannot be recycled and reused, causing loss and waste of raw materials and products in the post-treatment process, as well as indirect waste of energy

Method used

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  • Method for producing 2-alkylidene cyclopentanone

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1 A kind of method adopting clean technology to synthesize 2-alkylene cyclopentanone comprises the following steps:

[0034] (1) Put a certain amount of cyclopentanone, fatty aldehyde, weakly basic ion exchange resin, fatty acid and water into the reactor at one time and mix them at room temperature, then raise the temperature to 30°C, and continue the reaction at this temperature until the fatty aldehyde The basic reaction is complete;

[0035] (2) separate resin, water layer (phase) and oily phase (organic phase) from the reaction mixture that step (1) obtains, for the resin that still has reactivity, can be used for next batch of reaction use, the resin that loses activity sends to regenerate; the water phase can be recycled;

[0036] (3) the oil phase (organic phase) that step (2) obtains adopts vacuum distillation to remove the light component containing unreacted cyclopentanone and fatty acid, and the light component can be recycled;

[0037] (4) The ...

Embodiment 2

[0038] Embodiment 2 A kind of method adopting clean technology to synthesize 2-alkylene cyclopentanones comprises the following steps:

[0039] (1) First put cyclopentanone, weakly basic ion exchange resin, fatty acid and water into the reactor at one time, after heating up to 50°C, add fatty aldehyde dropwise under stirring, and then continue the reaction at this temperature, Until the basic reaction of fatty aldehyde is complete;

[0040] (2) separate out resin, water layer (phase) and oily phase (organic phase) from the reaction mixture that step (1) obtains, for the resin that still has reactivity, can be used for next batch of reaction use, the resin that loses activity sends to regenerate; the water phase can be recycled;

[0041] (3) the oil phase (organic phase) that step (2) obtains adopts vacuum distillation to remove the light component containing unreacted cyclopentanone and fatty acid, and the light component can be recycled;

[0042] (4) The product obtained af...

Embodiment 3

[0043] Embodiment 3 A kind of method adopting clean technology to synthesize 2-alkylene cyclopentanone comprises the following steps:

[0044] (1) First put a certain amount of cyclopentanone and aliphatic aldehyde into the reactor, heat up to 70°C, then put in a mixture of weakly basic ion exchange resin, fatty acid and water, and then maintain this temperature to continue the reaction until the aliphatic aldehyde is basically Complete response;

[0045] (2) separate out resin, water layer (phase) and oily phase (organic phase) from the reaction mixture that step (1) obtains, for the resin that still has reactivity, can be used for next batch of reaction use, the resin that loses activity sends to regenerate; the water phase can be recycled;

[0046](3) the oil phase (organic phase) that step (2) obtains adopts vacuum distillation to remove the light component containing unreacted cyclopentanone and fatty acid, and the light component can be recycled;

[0047] (4) The produ...

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Abstract

The invention discloses an environment-friendly method for producing 2-alkylidene cyclopentanone, which uses cyclopentanone and fatty aldehyde as raw materials and uses amine type weak-base ion-exchange resin for reaction under the condition of existence of fatty acid to produce 2-alkylidene cyclopentanone. The resin and the fatty acid which are separated can be recycled. The 2-alkylidene cyclopentanone is a key intermediate for synthesizing many spices (such as methyl dihydrojasmonate and delta-lactone). The traditional technology of the 2-alkylidene cyclopentanone has the outstanding problems that the acid-base solution catalytic system is adopted, which causes that the catalyst is very difficult to be recycled, the product yield is low, many by-products with high boiling points are generated, the reaction selectivity is poor, and a large amount of waste water is generated, thereby wasting resources and polluting environment. The method of the invention uses a catalytic system whichcan be recycled to replace the traditional solution catalytic system which can not be recycled, uses the cleaning production technology to improve the original technology, and simultaneously achievesthe purposes of saving and fully utilizing resources and protecting the environment.

Description

【Technical field】 [0001] The invention relates to the field of fine chemicals in chemical engineering—preparation of spice intermediates, which replaces the original process with clean production technology, and simultaneously realizes resource conservation and full utilization, as well as environmental protection, especially an environmentally friendly production 2- The method of alkylene cyclopentanones. 【Background technique】 [0002] The condensation reaction of aldehydes and ketones is a common reaction to increase carbon chains, and many new compounds can be formed, which is a very important class of organic synthesis reactions. The important intermediate in the synthesis of many perfumes (such as methyl dihydrojasmonate, δ-lactone) - 2-alkylene cyclopentanone is obtained by condensation reaction of fatty aldehyde and cyclopentanone: [0003] R: alkyl [0004] In the traditional synthesis process of 2-alkylene cyclopentanone, the condensation reaction of aliphatic ...

Claims

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Application Information

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IPC IPC(8): C07C49/647C07C45/74B01J31/08
Inventor 孙波高志国沈润李建铁刘保芬
Owner 河南蔚源生物科技有限公司
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