Preparation method of guerbet alcohol

A technology of Guerbet alcohol and fatty alcohol, which is applied in the field of preparation of Guerbet alcohol, can solve the problem of high trimer content, and achieve the effects of high product selectivity, strong controllability, and simple operation process

Active Publication Date: 2011-04-20
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The preparation method disclosed in CN 1436762 is to heat the primary alcohol to carry out the condensation dehydration reaction under the catalysis of alkaline substances and specially prepared amorphous nickel. The reaction time is 1h, the yield of glycerol is 90%, and the product purity exceeds 90%, but the product Medium trimer content is still high (2.9-3.2%)

Method used

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  • Preparation method of guerbet alcohol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 15g of KOH, 1000g of n-hexanol and 1g of nano-chromium oxide into a three-neck flask equipped with an intercalated thermometer, water separator, reflux condenser, nitrogen conduit, and electromagnetic stirrer, stir for 10 minutes with nitrogen gas, heat up to 140°C, and react for 45 minutes. After cooling, the reaction mixture was washed with water until neutral, dried with anhydrous magnesium sulfate, filtered, and distilled under reduced pressure to obtain colorless and transparent 2-butyl octanol with a purity greater than 96%, a yield of 92%, and a trimer content of 2.4%.

Embodiment 2

[0029] Add 15g NaOH, 1000g n-heptanol and 1.5g nano-barium oxide into a three-necked flask equipped with an intercalated thermometer, a water separator, a reflux condenser, a nitrogen conduit, and an electromagnetic stirrer, and stir for 5 minutes with nitrogen gas, and heat up to 160°C. 40min. After cooling, the reaction mixture was washed with water until neutral, dried over anhydrous magnesium sulfate, filtered, and distilled under reduced pressure to obtain colorless and transparent 2-pentylnonanol with a purity greater than 96%, a yield of 92%, and a trimer content of 2.0%.

Embodiment 3

[0031] Add 18g of KOH, 1000g of n-octanol and 2g of nano-copper oxide into a three-neck flask equipped with an intercalated thermometer, water separator, reflux condenser, nitrogen conduit and electromagnetic stirrer, stir for 10min with nitrogen gas, heat up to 170°C, and react for 30min . After cooling, the reaction mixture was washed with water until neutral, dried over anhydrous magnesium sulfate, filtered, and distilled under reduced pressure to obtain colorless and transparent 2-hexyldecanol with a purity greater than 96%. Yield 91%, terpolymer content 2.0%.

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Abstract

The invention discloses a preparation method of guerbet alcohol. In this method, nano-scale metal oxides are taken as catalysts, strong alkaline substances are taken as cocatalysts, and fatty alcohol is catalyzed and condensed with one water molecule removed at nitrogen atmosphere to obtain the guerbet alcohol. The invention is characterized in that the reaction time is short, the highest yield is up to 92%, the product purity is greater than 96%, and the product selectivity is high (the content of trimers in product is less than 2.5%).

Description

technical field [0001] The invention relates to a preparation method of Guerbet alcohol. Background technique [0002] Polyalkylcyclopentane synthetic oil is a new type of high-performance lubricating oil, which can be used for space machinery liquid lubrication, rocket engine and aircraft engine main bearing lubrication. Guerbet alcohol is the main raw material for the synthesis of polyalkylcyclopentane, and its synthesis method is to remove a molecule of water through condensation reaction with aliphatic primary or secondary alcohols. [0003] The preparation method disclosed in US 3119880 is to heat the primary alcohol to carry out the condensation dehydration reaction under the catalysis of copper oxide-barium oxide-chromium oxide under alkaline conditions, and the reaction time is 10 hours. [0004] The preparation method disclosed in US 4518810 is to heat the primary alcohol to carry out condensation dehydration reaction under the catalysis of alkaline substance and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/34C07C31/02B01J23/26B01J23/02B01J23/78B01J23/86
Inventor 高平刘维民梁永民孙初锋
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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