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Method for preparing cyclopentanol through hydration of cyclopentene

A cyclopentene hydration and cyclopentene technology, which is applied in the preparation of hydroxyl addition and organic chemistry, can solve the problems of reduced activity of strongly acidic cation exchange resins, large circulation of raw material cyclopentene, and low reaction conversion rate. Achieve the effects of fewer types, improved mutual solubility, and less dosage

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the reaction conversion rate is relatively low, and the recycling amount of raw material cyclopentene is large.
Though this method has improved the conversion ratio of cyclopentene, added C in the reaction system 2 ~C 5 Trialkylamines, because trialkylamines are basic, neutralize the sulfonic acid groups in the strongly acidic cation exchange resin, reducing the activity of the strongly acidic cation exchange resin
A large amount of phenol is also added to the system (the weight ratio of phenol to cyclopentene is 0.5-1), so that the non-reactive solution occupies a large proportion in the reaction system, the process becomes complicated, the subsequent separation is more difficult, and the energy consumption Relatively high

Method used

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  • Method for preparing cyclopentanol through hydration of cyclopentene
  • Method for preparing cyclopentanol through hydration of cyclopentene
  • Method for preparing cyclopentanol through hydration of cyclopentene

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Embodiment 1～32

[0011] The hydration reaction is carried out in a stainless steel reactor of Φ18mm×1200mm, and 30ml of DNW-II temperature-resistant resin catalyst produced by Dandong Mingzhu Special Resin Co., Ltd. is loaded into the reactor, and the top and bottom of the reactor are respectively loaded with a diameter of Φ0. 5mm ~ 1.2mm quartz sand, after the reactor is installed, replace it with nitrogen three times, and pass the airtight test, put cyclopentene, water and C 1 ~C 4 The low-carbon alcohol is sent to the preheater according to the specified ratio by a metering pump, and the material is preheated to 100°C to 200°C. The preheated material enters the hydration reactor for hydration reaction, the reaction temperature is controlled at 100°C-200°C, and the reaction pressure is 1.0MPa-6.0MPa. In order to compare the reaction effects, each embodiment and comparative example were carried out at 130° C. and 2 MPa. Unreacted cyclopentene is recycled.

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Abstract

The invention discloses a method for preparing cyclopentanol through hydration of cyclopentene. The method comprises a step of continuously performing hydration reaction on the cyclopentene and water through a fixed-bed reactor which holds a strongly acidic cation exchange resin catalyst, wherein the liquid hourly space velocity of the cyclopentene is 0.5h <-1> to 20h <-1>; the molar ratio of the cyclopentene to the water is 0.5-10:1; a reaction solvent is C1-C4 low-carbon alcohol; the amount of the added reaction solvent is 0.05-10 percent of the amount of the cyclopentene; the reaction temperature is 100-200 DEG C; and the reaction pressure is 1.0-6.0MPa. Compared with the prior art, the method has the advantages of single material in a reaction system, high conversion efficiency, high selectivity, fewer byproducts, high convenience in product separation, low energy consumption and the like.

Description

technical field [0001] The invention discloses a method for preparing cyclopentanol by hydrating cyclopentene, in particular a method for preparing cyclopentanol by hydrating cyclopentene in the presence of a strongly acidic cation exchange resin. Background technique [0002] Cyclopentanol is an important intermediate of fine chemical products, mainly used in the preparation of bromocyclopentane, chlorocyclopentane, etc., and can be used to manufacture antibacterial, antiallergic and other drugs. Cyclopentanol can be obtained from adipic acid through high-temperature deacidification to obtain cyclopentanone, and then through hydrogenation reaction. However, due to the large amount of pollutants and the restriction of raw material sources, this preparation method is gradually eliminated. In addition, C 5 In the distillate, cyclopentene obtained through separation is used as raw material, and cyclopentanol can also be produced through hydration reaction. There are two main ...

Claims

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Application Information

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IPC IPC(8): C07C35/06C07C29/04
Inventor 霍稳周吕清林刘野魏晓霞李花伊
Owner CHINA PETROLEUM & CHEM CORP
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