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Cleaning technology of iso-octly nitrate crude product

A technology of isooctyl nitrate and crude products, which is applied in the petroleum industry, the preparation of organic compounds, fuel additives, etc. It can solve the problems of easy rebound of esters, rebound of acid value, unsatisfactory washing effect of sodium organic acid, etc., and achieve washing effect Good results

Inactive Publication Date: 2006-11-29
HOLITECH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The alkali cleaning process of the prior art generally adopts the aqueous solution of sodium hydroxide or sodium carbonate as detergent, and its main disadvantage is: after the product is stored for a period of time (generally 2 months), the acid ester of the product tends to rebound 3-10 times
The mechanism of this acid value rebound is: the washing effect of sodium organic acid is not ideal, and the residual sodium organic acid in the finished product of isooctyl nitrate contacts with carbon dioxide in the air to form sodium carbonate precipitation and organic acid, resulting in the rebound of acid value

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] 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. Washing in cold water gave crude isooctyl nitrate.

[0017] 2) At room temperature, add 100Kg of 20% ammonia water to 500Kg crude isooctyl nitrate, raise the temperature to 58°C, react for 2 hours, then cool down to 20°C, let stand to separate layers, wash with water until neutral, and obtain the finished product of isooctyl nitrate , the acid value is 1.5KOH / 100ml, after two months, the acid value is 1.5KOH / 100ml, and after six months, the acid value is 1.5KOH / 100ml.

Embodiment 2

[0021] Start from step 2): at normal temperature, add 200Kg of 20% ammonia water to 1000Kg of isooctyl nitrate crude product, heat up to 60°C, react for 2h, then cool down to 20°C, stand for stratification, wash with water until neutral, and obtain nitric acid The acid value of the finished isooctyl ester is 2.2KOH / 100ml. After two months, the acid value is 2.2KOH / 100ml. After six months, the acid value is 2.2KOH / 100ml.

[0022] The finished product of isooctyl nitrate has an acid value of 2.2KOH / 100ml. After two months, the acid value is 6.7KOH / 100ml, and after six months, the acid value is 8.0KOH / 100ml.

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Abstract

A washing process for the coarse iso-octyl nitrate includes such steps as adding ammonia water to coarse iso-octyl nitrate, heating to 58-60 deg.C, stirring while reaction for 2 hr, cooling to 20 deg.C, laying aside, and water washing until it becomes neutral. It can prevent the increasing of acid ester in finished product.

Description

technical field [0001] The invention belongs to the technical field of carbon and nitrogen-containing compounds whose carbon frame is further substituted by oxygen atoms connected by single bonds, and specifically relates to a washing 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 alkaline cleaning process of the prior art generally uses sodium hydroxide or sodium carbonate aqueous sol...

Claims

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Application Information

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IPC IPC(8): C07C205/51C07C201/16C10L10/12
Inventor 高化忠王崇德亓即道段会伟
Owner HOLITECH TECH CO LTD
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