Catalyst and method thereof in for catalytic preparing preparation of chemical product 1,2-pentanediol in catalytic modeusing same

Abstract

The invention relates to a catalyst and a method for catalytic preparation ofthereof in preparing a chemical product 1,2-pentanediol in a catalytic modeusing same. The catalyst comprises a primary catalyst and a secondary catalyst, and is characterized in that the primary catalyst is salt of acetylacetonate salt or 2-ethylhexanoic acid salt 2-ethyl caproate, the secondary catalyst is lewis acid, and lewis acid is one or more of ferric trichloride, stannic chloride, tin trifluoromethanesulfonate, lithium chloride, lithium bromide or boron trifluoride. A process of preparing 1,2-pentanediol canbe simplified through catalysis of the catalyst, and 1,2-pentanediol and dimethyl-benzyl carbinol can be co-produced, and selectivity of the products 1,2-pentanediol and dimethyl-benzyl carbinol can be as high as 96% and 98% or more separately.

Description

technical field [0001] The invention relates to the technical field of chemical product synthesis, in particular to a method for simultaneously synthesizing dimethyl benzyl alcohol and 1,2-pentanediol. Background technique [0002] 1,2-Pentanediol is a straight-chain diol and is an important pharmaceutical and chemical raw material. Propylcycline is a systemic three-mile fungicide synthesized by a Belgian pharmaceutical company named Janssen in the late 1970s. It is a high-efficiency, low-toxicity, active-spectrum fungicide with dual functions of protection and treatment. It has a very broad application prospect. 1,2-Pentanediol is the key intermediate for the preparation of fungicide Propylene Glycol. More than 80% of the world's 1,2-Pentanediol is used to produce Propylene Glycol. 1,2-pentanediol can also be used to produce polyester and surfactants; 1,2-pentanediol also has moisturizing effects, and it can be used in combination with other moisturizers to produce a stron...

AI Technical Summary

Problems solved by technology

Although this method can co-produce dimethyl benzyl alcohol and 1,2-pentanediol at the same time, the method needs epoxidation reaction and hydrolysis reaction respectively, and rectification treatment needs to be carried out between the two-step reactions, and the reaction process is too complicated. Complicated, large energy consumption, high cost, at the same time, the selectivity of the preparation method dimethyl benzyl alcohol can only reach more than 90%, 1,2-pentanediol can only reach more than 80%, the selectivity of the product still lower