Method for synthesizing isooctyl nitrate

A technology of isooctyl nitrate and a synthesis method, applied in the field of synthesis of isooctyl nitrate, can solve problems such as potential safety hazards, low yield of isooctyl nitrate, etc., so as to ensure production safety, reduce synthesis cost and nitration reaction smoothly. Effect

Inactive Publication Date: 2006-08-09
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the disadvantages of the prior art that there may be huge potential safety hazards in the concentrated release of reaction heat and the low yield of isooctyl nitrate, and provides a method for synthesizing isooctyl nitrate. Using the method of the invention, the nitration reaction can be carried out smoothly. Prevent the concentrated release of reaction heat, ensure production safety, and obtain isooctyl nitrate with high yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 52ml of nitric acid with a concentration of 98% into the three-necked bottle, add 131ml of sulfuric acid with a concentration of 98% under water cooling and vigorous stirring to make a mixed acid, the temperature during the preparation of the mixed acid can be controlled below 35°C, and then add 90 79ml of petroleum ether at ~120°C, and then 157ml of isooctyl alcohol was added to the three-necked bottle, and the addition rate was controlled so that the reaction temperature was lower than 30°C, and the addition was completed in about 30 to 45 minutes. React for another half an hour. Static layering, separation of acid, ester and inert solvent mixed layer for water washing, alkali washing and washing to neutrality. After distillation, the purity of isooctyl nitrate reaches 99%, and the yield is 97%.

Embodiment 2

[0020] Process is the same as example 1, only change mixed acid proportioning and inert solvent: concentration is 82ml of 80% nitric acid, and concentration is 163ml of 98% sulfuric acid to make mixed acid, add No. 120 solvent naphtha 53ml, isooctyl alcohol 157ml in mixed acid. After distillation, the purity of 2-EHN reaches 99%, and the yield is 96.5%.

Embodiment 3

[0022] Process is the same as example 1, only change mixed acid proportioning and inert solvent: concentration is 65% nitric acid 105ml, and concentration is that 98% sulfuric acid 136ml makes mixed acid. Add 24ml of dichloroethane to the raw material isooctyl alcohol, and then add isooctyl alcohol (the amount of isooctyl alcohol is 157ml) with an inert solvent into the mixed acid. After distillation, the purity of 2-EHN reaches 98.3%, and the yield is 96%.

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PUM

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Abstract

The invention discloses Isooctyl nitrate compounding method. It includes the following steps: mixing nitric acid and sulfuric acid with mol ratio 1:1-5; adding latent solvent with 10-50% volume ratio to the mixed acid or isooctyl alcohol; adding isooctyl alcohol into mixed acid or adding the mixture of isooctyl alcohol and latent solvent into the mixed acid; reacting for 0.5-1h; static layering; discharging acid liquor; water washing; alkali washing; water washing to neutrality; separating ester from latent solvent; and drying by dryer. The latent solvent can be cycling using.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a synthesis method of isooctyl nitrate (2-EHN). Background technique [0002] The main use of isooctyl nitrate is to increase the cetane number of diesel. Isooctyl nitrate can be decomposed by heating at low temperature to generate active free radicals. These free radicals participate in the oxidation reaction and decomposition reaction of diesel oil, and the oxidation chain reaction is initiated with these free radicals as the center, so that the activation energy of spontaneous combustion of diesel oil is greatly reduced, improving ignitability of diesel fuel. After adding isooctyl nitrate to diesel, due to the participation of free radicals, the fuel can be oxidized at a lower temperature, and the reaction speed is accelerated, which shortens the combustion delay period, thereby increasing the cetane number of diesel. [0003] The synthesis of isooctyl nitrate is exactly t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C201/02C07C203/04
Inventor 王秀珍陈卫红李朝恒裴旭东张凡程国良
Owner CHINA PETROCHEMICAL CORP
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