Composite multi-carbon alcohol cosolvent and preparation method thereof

Abstract

The present invention discloses a composite multi-carbon alcohol cosolvent and a preparation method thereof. The composite multi-carbon alcohol cosolvent adopts offcuts from an ethanol production plant or a winery as raw materials, wherein the offcuts comprise 40-70% of ethanol, 5-15% of propanol and isopropanol, 5-15% of n-butanol, isobutanol and tert butyl alcohol, 1-5% of amyl alcohol, isoamyl alcohol, hexyl alcohol, heptanol, octanol, nonanol, decanol and other liquid multi-carbon alcohols, and 14-40% of water. With performing steps of the raw material pretreatment, pervaporation membrane dehydration, blending and the like, the composite multi-carbon alcohol cosolvent with the water content less than 0.5% is prepared. The composite multi-carbon alcohol cosolvent can be adopted as an alcohol oil cosolvent, and the assistant dissolution effect of the composite multi-carbon alcohol cosolvent is high. The composite multi-carbon alcohol cosolvent provides lower toxicity than the aromatic alcohol oil cosolvent, and provides lower corrosion than the acetone alcohol oil cosolvent. In the prior art, boiling points of the propanol, the isobutanol, the n-butanol and the like are close to the boiling point of the water, and the azeotrope effect is further generated, such that the dehydration is difficult to perform by the fractionation method. With the preparation method of the present invention, the disadvantage in the prior art is overcome. The production cost for the composite multi-carbon alcohol cosolvent is significantly lower than the production cost of the composite multi-carbon alcohol cosolvent produced by blending the corresponding monomer multi-carbon alcohol, and the assistant dissolution effect of the composite multi-carbon alcohol cosolvent is higher than the assistant dissolution effect of each monomer multi-carbon alcohol.

Description

technical field [0001] The invention relates to a composite multi-carbon alcohol cosolvent used for solubilizing hydrocarbons, methanol and ethanol and a preparation method thereof. Background technique [0002] When gasoline, diesel oil and other hydrocarbons are blended with methanol, ethanol and other alcohols, due to the large difference in lipophilic and hydrophilic properties, they are usually incompatible and stratified. When the temperature is low or contains water, the stratification phenomenon is more serious. Therefore, it is very necessary to develop alcohol-oil co-solvents with superior performance. Although there are many kinds of co-solvents for promoting the mutual solubility of alcohol and oil, most of them are not ideal enough in terms of their effectiveness in promoting mutual solubility of alcohol and oil, product cost, toxicity, and corrosiveness. For example, monomeric multi-carbon alcohol co-solvents have high cost and poor efficacy, alcohol-oil co-so...

AI Technical Summary

Problems solved by technology

Although there are many kinds of co-solvents to promote the mutual solubility of alcohol and oil, most of them are not ideal in terms of their effectiveness in promoting the mutual solubility of alcohol and oil, product cost, toxicity, and corrosiveness.

For example, monomeric multi-carbon alcohol co-solvents are costly and less effective, alcohol-oil co-solvents such as acetone are more corrosive, and alcohol-oil co-solvents such as aromatic hydrocarbons are more toxic