Method for efficiently removing aldehyde impurities in alcohols

The invention discloses a method for efficiently removing aldehyde impurities in alcohols, which is characterized in that a sulfonic acid group modified porous nano silicon dioxide composite material is used as a catalyst for condensation reaction and is applied to catalytic conversion and removal of trace aldehyde substances in alcohol substances, and the sulfonic acid group modified porous nano silicon dioxide composite material is prepared by taking SiO2 microspheres as a substrate and taking SiO2 microspheres as a substrate. Sulfonic acid groups are connected to the surfaces of the SiO2 microspheres. The purpose of introducing a catalytic active center is achieved by introducing a sulfonic acid group, a high aldehyde impurity removal rate is obtained by increasing the specific surface area to promote adsorption of substrate molecules, high conversion rate and product selectivity can be obtained, the conversion rate of substrate aldehydes can reach 99.99% or above, the selectivity of a condensation product