Method for preparing n-tetradecane and n-nonadecane in one time

A technology of n-tetradecane and n-nonadecane, which is applied in the production of hydrocarbons from halogen-containing organic compounds, organic chemistry, etc., can solve the problems of complex process conditions, difficult raw materials, low safety factor, etc., and achieve purity and yield The effect of high efficiency, breakthrough difficulty in purification, and improvement of production efficiency

Inactive Publication Date: 2010-12-08
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above methods can prepare the corresponding n-alkane monomers, there are certain problems in each method; the first method has relatively complicated process conditions, high requirements for certain equipment and materials, and a large investment scale, which is only applicable to It is suitable for large-scale petrochemical production; the second method is suitable for symmetrical even-numbered alkanes, and the product needs to be repeatedly purified by ether, and the raw materials with a positive octadecyl carbon chain are not easy to obtain; the third and fourth methods are dangerous to operate. It is easy to erupt in the violent reaction of sodium and haloalkane, with low safety factor and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of one-time preparation of n-tetradecane and n-nonadecane comprises the steps of:

[0025] (1). Mix 1790.8g (10mol) of n-heptane bromide and 2492.4g (10mol) of n-dodecane bromide evenly to form a mixture of alkanes bromide, which is set aside;

[0026] (2). Weigh 483g (21mol) of sodium metal and cut it into small thin strips with an area of ​​about 1×3cm 2 ,spare;

[0027] (3). Put 50g of bromoalkane mixture and 20g of sodium metal into the reaction kettle, stir and heat up to 80°C, remove the heat source, rely on reaction heating, and maintain at 120°C, continuously drop the remaining bromoalkane mixture, and Add metallic sodium and keep it in a slight reflux state. After the addition is complete, control the temperature at 160°C and keep the temperature constant for 2 hours;

[0028] (4). Add 400 grams of 95% ethanol and 1000ml in turn, separate the organic matter, wash with water until neutral, dry with anhydrous magnesium sulfate, collect th...

Embodiment 2

[0031] The preparation method of one-time preparation of n-tetradecane and n-nonadecane comprises the steps of:

[0032] (1). Mix 1790.8g (10mol) of n-heptane bromide and 2492.4g (10mol) of n-dodecane bromide evenly to form a mixture of alkanes bromide, which is set aside;

[0033] (2). Weigh 483g (21mol) of sodium metal and cut it into small thin strips with an area of ​​about 1×3cm 2 ,spare;

[0034] (3). Put 50g of bromoalkane mixture and 20g of sodium metal into the reaction kettle, stir and heat up to 80°C, remove the heat source, rely on reaction heating, and maintain at 130°C, continuously drop the remaining bromoalkane mixture, and Add metallic sodium and keep it in a slight reflux state. After the addition is complete, control the temperature at 140°C and keep the temperature constant for 2 hours;

[0035] (4). Add 400 grams of 95% ethanol and 1000ml in sequence, separate the organic matter, wash with water until neutral, dry with anhydrous magnesium sulfate, distil...

Embodiment 3

[0037] The preparation method of one-time preparation of n-tetradecane and n-nonadecane comprises the steps of:

[0038] (1). Mix 1790.8g (10mol) of n-heptane bromide and 2492.4g (10mol) of n-dodecane bromide evenly to form a mixture of alkanes bromide, which is set aside;

[0039] (2). Weigh 483g (21mol) of sodium metal and cut it into small thin strips with an area of ​​about 1×3cm 2 ,spare;

[0040] (3). Put 50g of bromoalkane mixture and 20g of sodium metal into the reaction kettle, stir and heat up to 80°C, remove the heat source, rely on reaction heating, and maintain at 130°C, continuously drop the remaining bromoalkane mixture, and Add metallic sodium and keep it in a slight reflux state. After the addition is complete, control the temperature at 150°C and keep the temperature constant for 2 hours;

[0041] (4). Add 400 grams of 95% ethanol and 1000ml in sequence, separate the organic matter, wash with water until neutral, dry with anhydrous magnesium sulfate, distil...

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PUM

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Abstract

The invention relates to a method for preparing n-tetradecane and n-nonadecane in one time, which comprises the following steps of: preparing for the raw materials of bromoalkane and metal sodium for later use; adding bromoalkane mixed liquor and the metal sodium into a reaction kettle, stirring, heating to 80 DEG C, maintaining the temperature at 120-140 DEG C, adding the rest raw materials, then controlling the temperature at 140-160 DEG C, and maintaining the temperature for 2 hours; adding alcohol and water in sequence, separating out organic matters, washing to be neutral with water, drying by using anhydrous magnesium sulfate, then distilling and collecting distillates, and collecting the finished products of the n-tetradecane and the n-nonadecane through a water distillate column according to different boiling points. In the method for preparing the n-tetradecane and the n-nonadecane, the difference in carbon chains of the raw materials is not less than 3, the problem of difficult purification of the finished products is overcome, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of alkanes in chemical reagents, and relates to a preparation method of normal alkanes, in particular to a preparation method for one-time preparation of n-tetradecane and n-nonadecane. Background technique [0002] As one of the key components of diesel, low-temperature improvement and environmentally friendly liquid fuel compositions, n-paraffins have been widely used. important role. At present, due to the different sources of n-alkanes, the composition of various n-alkanes is different, resulting in differences in product quality to varying degrees. Some special n-alkanes monomers are needed to adjust the component distribution ratio of n-alkanes, so that Quality can be guaranteed to the greatest extent. [0003] According to the search, the types of n-alkane preparation methods that currently exist are as follows: 1. The mixture of n-alkane by molecular sieve or urea dewaxing method is used, and then the method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/22C07C9/15C07C1/26
Inventor 石开丁
Owner TIANJIN CHEM REAGENT RES INST
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