Process for synthesizing pentaerythritol oleate
A technology of pentaerythritol oleate and synthesis method, which is applied in the preparation of carboxylate esters, chemical instruments and methods, and the preparation of organic compounds, and can solve problems such as easy generation of toxic gas and waste liquid, impact on human body and environment, and deep color , to achieve the effects of equipment investment and energy saving, excellent viscosity-temperature performance, and simple process
Inactive Publication Date: 2002-11-27
王伟松
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[0002] Pentaerythritol oleate has broad application prospects in the fields of aero-engine lubricating oil, metal high-temperature processing oil, and fiber oil because of its good heat resistance, excellent viscosity-temperature properties, and good lubricating properties. The synthesis methods of esters mainly include direct esterification method and acid chloride method. The direct esterification method uses pentaerythritol and fatty acid as raw materials, and under the action of acidic catalysts such as concentrated sulfuric acid, phosphoric acid, etc., direct dehydration esterification, generally used fatty acid is C 5 -C 9 acid, its product has a deep color and is easy to corrode equipment during production: the acid chloride method firstly chlorates the fatty acid with thionyl chloride, and then reacts with pentaerythritol. This method has a high purity product, but it is easy to produce toxic gas and waste liquid, seriously affecting the human body and the environment
And the synthetic method of pentaerythritol oleate is then seldom reported
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[0013] Add 50 parts of pentaerythritol and 450 parts of oleic acid into the reaction kettle, add 4 parts of p-toluenesulfonic acid catalyst under stirring, gradually heat up 40 parts of toluene solvent, reflux reaction at a temperature of 150-160 °C for 8 hours, and then transfer to High-temperature vacuum deacidification kettle, under the conditions of vacuum degree of 100Pa and temperature of 260°C, carry out deacidification reaction for 1 hour to remove solvent and residual acid, then cool to 80°C, add diatomaceous earth and filter to obtain pentaerythritol oleate , the yield is 95%, and the flash point is greater than 320°C.
[0014] Its dehydration condensation reaction equation is in the above-mentioned embodiment: C[CH 2 OOC (CH 2 ) 7 CH=CH(CH 2 ) 7 CH 3 ] 4 +4H 2 o
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Abstract
A process for synthesizing pentaerythritol oleate from pentaerythritol and oleic acid as raw materials includes dewatering condensation reaction under the action of organic acid as catalyst and removing residual acid under 20-100 Pa to obtain the pentaerythritol oleate. Its advantages are simple process, little by-reaction, low cost and high output rate. The said product has good high-temp. resistance, good lubricating performance, excellent viscosity-temp. characteristic and low-temp. flowability.
Description
technical field [0001] The invention relates to a synthesis method of pentaerythritol oleate, which belongs to the technical field of synthesis of ester compounds in organic chemistry. Background technique [0002] Pentaerythritol oleate has broad application prospects in the fields of aero-engine lubricating oil, metal high-temperature processing oil, and fiber oil because of its good heat resistance, excellent viscosity-temperature properties, and good lubricating properties. The synthesis methods of esters mainly include direct esterification method and acid chloride method. The direct esterification method uses pentaerythritol and fatty acid as raw materials, and under the action of acidic catalysts such as concentrated sulfuric acid, phosphoric acid, etc., direct dehydration esterification, generally used fatty acid is C 5 -C 9 acid, its product has a deep color and is easy to corrode equipment during production: the acid chloride method firstl...
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IPC IPC(8): C07C67/08C07C69/33
Inventor 王伟松
Owner 王伟松
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