Synthetic method for dipentaerythritol hexa-esters

Abstract

A synthesis method of dipentaerythritol hexa-ester belongs to the ester compound synthesis technical field of organic chemistry, which uses dipentaerythritol and isononanoic as raw materials. The invention is characterized in that in the presence of solid catalyst and nitrogen atmosphere, the invention processes dehydration-condensation reaction, deacidification and filtration to prepare dipentaerythritol hexa-ester, wherein the solid catalyst is stannous oxide, sodium aluminate or magnesia in the 0.04-0.15% usage of the total weight of dipentaerythritol and isononanoic, and the mass ratio between the dipentaerythritol and isononanoic is 1:6.3-7.2. The invention reasonably utilizes novel solid catalyst with high selectivity to prevent polyatomic alcohol from carbonization at high temperature, with shallow product color and non byproduct generation, which removes the catalyst via filtration after reaction to improve product quality, while the new solid catalyst will not corrode device, has simple production and can be circulated.

Description

Technical field [0001] The invention relates to a synthesis method of dipentaerythritol hexaester and belongs to the technical field of synthesis of ester compounds in organic chemistry. Background technique [0002] Dipentaerythritol ester is divided into ether type and ester type. It has good dielectric properties, extremely low volatility, and good high temperature performance. It is mainly used for high temperature electrical insulation and can meet the requirements of 105℃ grade PVC cable materials. [0003] The current difficulty in the synthesis of polyol esters such as dipentaerythritol ester is that the products and reactants are easily carbonized under high temperature conditions, and the product is darker in color, which directly affects various properties of the product. Therefore, research on the synthesis of polyol esters currently focuses on catalyst selection, such as the use of sulfonic acid, cation exchange resin, calcium methoxide and other catalysts. The...

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Problems solved by technology

The synthesis of traditional industrial lubricating oil esters is based on concentrated sulfuric acid as a catalyst. The yield of this method is low (60-70%), the product is very carbonized, and the product is darker in color, which directly affects the performance of the product.

"Chemical Research and Application" in 2006, Volume 18, No. 11, used concentrated sulfuric acid / p-toluenesulfonic acid composite catalyst, and applied microwave radiation to the synthesis of dipentaerythritol hexaester, which can speed up the reaction speed and increase the yield. , good selectivity, etc., but all catalysts in this method remain in the product, which affects product quality