Method for co-production of dimethyl decynediol and methyl hexynol

Abstract

The invention relates to a method for co-production of dimethyl decynediol (4, 7-dimethyl-5-decyne-4, 7-diol) and methyl hexynol (3-methyl-1-hexyne-3-alcohol), which comprises the following steps: by taking 2-pentanone and acetylene as raw materials, potassium hydroxide or potassium isobutoxide or potassium tert-butoxide as a catalyst and an organic solvent as a dispersing agent, reacting 2-pentanone with normal-pressure or low-pressure acetylene at a relatively low temperature to generate a methyl hexynol-catalyst complex, mixing the methyl hexynol-catalyst complex with 2-pentanone, and quickly reacting through a high-temperature reaction tube to generate the dimethyl decynediol-catalyst complex; hydrolyzing the reaction product to remove potassium hydroxide, and fractionating to collect each part. The method has the characteristics of low reaction temperature, short reaction time, less side reaction, less catalyst consumption and the like.

Description

technical field [0001] The invention relates to a synthesis method of chemical substances 4,7-dimethyl-5-decyn-4,7-diol and 3-methyl-1-hexyn-3-ol. Background technique [0002] Both dimethyldecynediol (4,7-dimethyl-5-decyn-4,7-diol) and methylhexynol (3-methyl-1-hexyn-3-ol) It is a chemical intermediate with excellent surface activity. It is used alone or as one of the components. It is also an upstream raw material for the further synthesis of nonionic surfactants with unique properties. At present, there is little public information about the industrial synthesis of these two chemical substances. From the molecular structures of these two chemical substances, it can be known that both dimethyldecynediol and methylhexynol can be passed through Reppe with 2-pentanone and acetylene. However, the molecular structure of the raw material has a large steric hindrance, and the reaction process requires a higher temperature and a longer reaction time, which will inevitably lead to...

AI Technical Summary

Problems solved by technology

At present, there is little public information about the industrial synthesis of these two chemical substances. From the molecular structures of these two chemical substances, it can be known that both dimethyldecynediol and methylhexynol can be passed through Reppe with 2-pentanone and acetylene. However, the molecular structure of the raw material has a large steric hindrance, and the reaction process requires a higher temperature and a longer reaction time, which will inevitably lead to side reactions such as polymerization of the reaction product in a long-term high-temperature environment, and will also wrap the catalyst to allow Its deactivation greatly increases the consumption of the catalyst