Production method for isooctyl nitrate

The technology of a kind of isooctyl nitrate and production method is applied in the production field of petrochemical product nitrate, which can solve the problems of high equipment requirements, high production cost, and increased energy consumption, and achieve stable and easy-to-control reactions, low production costs, and convenient The effect of the operation

Inactive Publication Date: 2016-03-23
JIANGXI SILINCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have high requirements on equipment and are expensive, especially the measurement is not easy to control and affect the reaction, the high cost of equipment leads to high production cost
The synthesis reaction of isooctyl nitrate is violently exothermic, and it is potentially dangerous to adopt the kettle reaction. The Chinese invention patent application number is 200610017472.3, which discloses a synthesis process of isooctyl nitrate. The traditional kettle production method is used. The inert solvent dilutes the reaction to alleviate the severe exothermic problem of the reaction. Finally, the inert solvent is removed by heating and distillation to obtain pure isooctyl nitrate. Heating and distillation increases energy consumption, and heating of isooctyl nitrate is potentially dangerous.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A kind of production method of isooctyl nitrate, its steps are: (1) add 100 kilograms of 98% nitric acid in 1500L reaction kettle, add 424 kilograms of 87% sulfuric acid under water cooling, vigorous stirring, make the mixed acid of sulfuric acid and nitric acid (2) Add 156 kg of isooctyl nitrate to 195 kg of isooctyl alcohol and mix evenly; (3) Add the mixture of isooctyl nitrate and isooctyl alcohol prepared in (2) to the prepared In the mixed acid, this process controls the addition speed to keep the reaction temperature between 10-30°C. After the addition is completed, stir and react for 45 minutes, then separate the liquid, wash the organic phase with alkali, and wash with water. The product purity of isooctyl nitrate is 99.1%, and the yield is 98.2%.

Embodiment 2

[0012] A kind of production method of isooctyl nitrate, its steps are: (1) add 100 kilograms of 98% nitric acid in 1500L reaction kettle, add 315 kilograms of 93% sulfuric acid under water cooling, vigorous stirring, make the mixed acid of sulfuric acid and nitric acid ; (2) Add 230 kg of isooctyl nitrate to 195 kg of isooctyl alcohol and mix evenly; (3) Add the mixture of isooctyl nitrate and isooctyl alcohol prepared in (2) to the prepared In the mixed acid, this process controls the addition speed to keep the reaction temperature between 10-30°C. After the addition, stir the reaction for 1 hour, stand still and separate the liquid, wash the organic phase with alkali, and wash with water to obtain isooctyl nitrate product with a purity of 99.4% and a yield of 98.5% %.

Embodiment 3

[0014] A kind of production method of isooctyl nitrate, its steps are: (1) add 100 kilograms of 98% nitric acid in 1500L reaction kettle, add 226 kilograms of 98% sulfuric acid under water cooling, vigorous stirring, make the mixed acid of sulfuric acid and nitric acid ; (2) Add 290 kg of isooctyl nitrate to 195 kg of isooctyl alcohol and mix well; (3) Add the mixture of isooctyl nitrate and isooctyl alcohol prepared in (2) to the prepared In the mixed acid, this process controls the addition rate to keep the reaction temperature between 10-30°C. After the addition, stir the reaction for 1 hour, then separate the liquid, wash the organic phase with alkali, and wash with water. The product purity of isooctyl nitrate is 99.2%, and the yield is 98.2% %.

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Abstract

The invention discloses a production method for isooctyl nitrate. The production method comprises steps: firstly, an acid mixture of sulfuric acid and nitric acid with a mol ratio of 1.5-2.5:1 is prepared as a nitrating agent; secondly, a mixed solution of isooctyl nitrate and isooctyl alcohol with a mass ratio of 0.8-2:1 is prepared; thirdly, the mixed solution of isooctyl nitrate and isooctyl alcohol is added in the acid mixture of sulfuric acid and nitric acid at a temperature of 10-30 DEG C, the reaction is carried out for 0.5-1h, the mixture is allowed to stand for separation, organic phase alkali washing is carried out, water washing is carried out, and an isooctyl nitrate product is prepared. The production method is advantaged by simple technology, low cost and easy industrialization.

Description

technical field [0001] The invention belongs to the technical field of production of petrochemical product nitrate, in particular to a production method of isooctyl nitrate. Background technique [0002] Isooctyl nitrate is a cetane number improver for diesel oil with excellent performance. After adding it, it can effectively improve the combustion performance of diesel oil, shorten the ignition time, improve the dynamics of locomotive thermal working conditions, and the fuel saving effect is very obvious. [0003] The current synthesis method of isooctyl nitrate generally adopts the mixed acid method, that is, at low temperature, isooctyl alcohol reacts with the mixed acid of nitric acid and sulfuric acid, and after the reaction ends, static liquid separation, alkali washing, washing with water, and drying obtains the isooctyl nitrate product. The specific methods include kettle type, tubular type and microreactor method. Chinese Invention Patent Application No. 2007101590...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C203/04C07C201/02
CPCC07C201/02
Inventor 廖维林芮培欣钟前雷志伟赵晓华严楠涂媛红
Owner JIANGXI SILINCO
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