Normal-temperature continuous production technology for cetane number improver

Abstract

The invention discloses normal-temperature continuous production technology for a cetane number improver, which belongs to the technical field of the preparation of organic nitrate ester compounds, and comprises the steps of using nitramine or nitric acid and isooctanol to react under the action of a catalyst. The normal-temperature continuous production technology for the cetane number improver is characterized by changing concentrated sulfuric acid as the catalyst, using different proportions of the concentrated sulfuric acid, concentrated nitric acid and water to control different reaction temperatures and realize continuous production, returning waste acid to an acid distribution post for acid mixing according to the content of the acid, then circularly utilizing the waste acid, finally selecting a normal reaction temperature of between 8 DEG C below zero and 40 DEG C in order to the safety and the control of the purity and the yield of energy consumption and the like, and utilizing the proportion of acid mixing to control reaction rate to achieve optimum process conditions such as continuous recycling of the waste acid, continuous feeding nitrification and the like. The technology overcomes the disadvantages of unsteady quality of products, large potential safety hazard, high energy consumption and material consumption and the like, improves the yield, ensures that the quality of the products entirely and steadily reaches that of high-class products, and greatly improves the utilization efficiency of equipment.

Description

technical field [0001] The invention belongs to the technical field of preparing organic nitrate lipid compounds, and in particular relates to a normal-temperature continuous production process of an organic nitrate lipid cetane number improver. Background technique [0002] The method of solvent extraction and hydrogenation can increase the cetane number of diesel oil, but it is costly and economically uneconomical, while the production of cetane number improver is low in cost, simple in process, and can effectively increase the cetane number , so the cetane number improver is more and more people's attention. Isooctyl nitrate is a widely accepted diesel cetane number improver, especially when mixed with 2-methyl-2-nitropropyl nitrate, it can greatly increase the cetane number. [0003] The method for producing isooctyl nitrate generally adopts the mixed acid method, that is, isooctanol is added to the mixed acid composed of nitric acid and sulfuric acid at normal temperat...

AI Technical Summary

Problems solved by technology

[0005] There are two kinds of industrial production techniques of cetane number improver (isooctyl nitrate) in the prior art, one is high temperature gap method, the reaction temperature is controlled at 60~80 ℃, with ammonium nitrate or nitric acid and isooctyl alcohol in catalyst The waste acid cannot be recycled, the consumption of raw materials is large, the yield is low, and the quality of the product is unstable. The temperature is too low and does not react. If the temperature is slightly higher, it is easy to leak or even explode.

The other is the low-temperature method. The reaction temperature is -10 to 0°C. Concentrated nitric acid and isooctyl alcohol are used to react under the action of a catalyst. The production process must strictly control the low temperature, which requires refrigeration, high energy consumption, and waste acid cannot be recycled. Raw material consumption is large, production safety factor is small