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Dewater technology of isooctyl nitrate

A technology of isooctyl nitrate and process, applied in directions such as nitrate preparation, can solve problems such as uncertain effect, molecular sieve failure, unsuitable for industrial production, etc., and achieves the effect of simple operation and low cost

Inactive Publication Date: 2007-01-31
SHANDONG LIANHE CHEM
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Its disadvantage is that the dehydration process is suitable for small laboratory tests and is not suitable for industrial production
Its shortcoming is: this dehydration method is difficult to remove the moisture of isooctyl nitrate finished product to below 0.01%
[0006] At present, the dehydration process used in industry is to first use sedimentation separation for dehydration, and then use molecular sieve for dehydration. Due to the uncertain effect of sedimentation separation and dehydration, sometimes the water content after dehydration is high, resulting in the failure of molecular sieve, resulting in unstable product quality.
In addition, the detection of molecular sieve failure is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] 1) Add 300L concentrated sulfuric acid to the reaction kettle, add 200L concentrated nitric acid dropwise within 60 minutes under vigorous stirring, and control the temperature below 35°C, then add 350L isooctyl alcohol dropwise in 60-70 minutes, and control the temperature during the dropping process at 40°C Next, after the addition, keep the reaction at 45°C for 60 minutes. Wash in cold water to obtain the crude product of isooctyl nitrate, and then enter the drying process after extraction, alkali washing and water washing.

[0019] 2) The washed isooctyl nitrate is separated by sedimentation to remove most of the water, and then enters the bottom of the anhydrous sodium sulfate dehydrator. After absorbing water through anhydrous sodium sulfate, it overflows to the next dehydrator for dehydration. After three dehydration Dehydration device, when the detected moisture is 0.01%, it is qualified.

[0020] During the micro-dehydration process, a wooden stick can be inse...

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Abstract

The present invention relates to a dehydration process of isooctyl nitrate, belonging to the field of carbon and nitrogen bearing compound technology whose carbon frame is further connected by single bond and is substituted by oxygen atom. It includes dehydration procedure, utilizes sedimentation separation to remove most of water content, and further utilizes anhydrous sodium sulfate to remove micro water content. Said invention can stably control water content in the product and make it be below 0.01%.

Description

technical field [0001] The invention belongs to the technical field of carbon- and nitrogen-containing compounds whose carbon frames are further replaced by oxygen atoms connected by single bonds, and specifically relates to a dehydration process of isooctyl nitrate. Background technique [0002] Isooctyl nitrate is a good diesel cetane number improver, especially when mixed with 2-methyl-2-nitropropyl nitrate, it can greatly increase the cetane number of diesel oil. [0003] In the prior art, the method for preparing isooctyl nitrate generally adopts the mixed acid method, that is, under normal temperature or low temperature conditions, isooctyl alcohol is added to the mixed acid composed of nitric acid and sulfuric acid, and the crude product of isooctyl nitrate is extracted or separated. Washed, washed to neutral, dried and distilled under reduced pressure. [0004] The date of application is August 24, 1987, and the Chinese patent application number of 87105712 disclose...

Claims

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Application Information

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IPC IPC(8): C07C201/02C07C203/04
Inventor 庞世森王崇德亓即道段会伟李纪文
Owner SHANDONG LIANHE CHEM
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