Method for preparing 1,5-pentanediol

Abstract

The present invention relates to a method used for preparing 1, 5-pentanediol with hydrogenation of 1, 5-glutaraldehyde. In the method, Ru is used as the load catalyst of active components; the weight percent of the Ru in the catalyst is 0.2 percent to 10 percent; the carrier is a molecular sieve, or one of or the mixture of Al2O3, SiO2, TiO2, MgO, amorphous aluminosilicate and activated carbon. When the 1, 5-glutaraldehyde is hydrogenated to prepare the 1, 5-pentanediol, the reaction conditions are mild; the catalyst has high activity; and the method is an effective way for preparing the 1, 5-pentanediol.

Description

technical field [0001] The invention relates to a method for preparing 1,5-pentanediol by hydrogenating 1,5-pentanedialdehyde, specifically comprising a catalyst and a reaction for preparing 1,5-pentanediol by hydrogenating 1,5-pentanedialdehyde craft. Background technique [0002] 1,5-pentanediol is a widely used chemical, which can be directly used as a solvent or wetting agent for cutting oil, special detergent, latex paint, and can also be used to produce new polyesters, coatings, adhesives , sealants, plasticizers and other raw materials. There are four main production methods: 1) It is prepared by catalytic hydrogenation of tetrahydrofurfuryl alcohol, the reaction temperature is 300-330°C, and the reaction pressure is 22-42MPa. The reaction pressure of the method is high, which increases equipment investment and operation difficulty; 2) the epoxypentenol prepared by the photooxidation of cyclopentadiene is prepared by hydrogenation at 70-100° C. and a pressure of abo...

AI Technical Summary

Problems solved by technology

The photooxidation yield of cyclopentadiene is low, and the economy of the whole process is relatively poor; 3) Chinese patent CN1565728A has described 1,5-dimethyl glutarate under the action of copper-zinc-aluminum catalyst at 150~350 ℃ and 3~ A method for preparing 1,5-pentanediol by hydrogenation at 5 MPa, the conversion rate of dimethyl 1,5-pentanediol is greater than 95%, and the selectivity of 1,5-pentanediol is greater than 95%

However, this method uses glutaric acid as the starting material, and needs to go through reaction steps such as esterification in the middle, and the process is relatively long.