Preparation method of cyclohexyl nitrate

Abstract

The invention provides a preparation method of cyclohexyl nitrate. The method comprises the following steps: 1, adding a certain amount of concentrated sulfuric acid with the concentration of 98% to afour-opening flask in which a stirring device, a katathermometer, an air condensing tube and a dropping funnel are mounted; dropwise adding 65% concentrated nitric acid with strong stirring; then dropwise adding a certain amount of cyclohexanol-chloroform solution; and then reacting for 20-25 min; 2, pouring the reaction mixture into ice water; separating out an organic phase; extracting water phase twice through 45-55mL of chloroform; and combining the extracted product with the organic phase; 3, washing the organic phase with a sodium carbonate water solution; washing with water until neutrality is realized; and then drying with anhydrous sodium sulfate; and 4, boiling up chloroform under normal pressure to obtain a rough product; and then performing pressure-reduction distilling to obtain pure cyclohexyl nitrate. The method is high in yield, and the cyclohexyl nitrate is high in purity; the processes are simple; the raw materials are easy to obtain; the cost is low; and the shortage of high cost can be overcome.

Description

technical field [0001] The invention relates to cyclohexyl nitrate technology, in particular to a preparation method of cyclohexyl nitrate. Background technique [0002] At present, my country's oil refineries generally adopt catalytic cracking secondary processing technology to increase the output of light oil. The octane number of gasoline in light oil produced by this process is relatively high, but the cetane number of diesel oil is very low, generally only 20-25, and can only be blended with straight-run diesel oil. However, due to the limited production of straight-run diesel oil and the heavy crude oil in newly developed oilfields, the cetane number of commercially available diesel oil in my country generally does not meet the requirements. Therefore, improving the cetane number of diesel oil is an urgent problem to be solved. The method of solvent extraction and hydrogenation can increase the cetane number of diesel oil, but it is costly and economically uneconomic...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to, for the preparation method solvent acetic acid of present cyclohexyl nitrate is used too much, can not recycle and reuse, and cost is high, does not have the problem of actual industrial production value, proposes a kind of preparation method of cyclohexyl nitrate, the The yield and purity of the method are high, the process is simple, the raw materials are easy to obtain, and the cost is low, which overcomes the disadvantages of high cost