New method for synthesizing and purifying n-eicosane

A technology of n-eicosane and a new method, which is applied in the field of synthesis and purification of n-eicosane, can solve problems such as shortage of raw materials and impact on the growth of economic benefits, and achieve the effects of improving quality, saving money, and improving product quality

Inactive Publication Date: 2010-05-26
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The market supply of raw materials used in the other two methods is less, so there is a shortage of raw materials, which limits the increase in production and affects the growth of economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1). Mix 1370.3g [10mol] n-bromobutane with 3053.4 bromo-n-hexadecane [10mol] to obtain a mixed solution of bromoalkane;

[0028] (2). After mixing the mixture of petroleum ether 18817.6g at 60-1200°C and alkyl bromide, slowly add 551.76g [24mol] of sodium metal, the reaction temperature is 60-90°C, after adding sodium, reflux for 1 ~2 hours to obtain a mixed solution containing sodium bromide;

[0029] (3). Add 400g of absolute ethanol dropwise to the mixed solution containing sodium bromide, then add 2000g of water, separate the organic phase and wash it to neutrality to obtain a neutral organic phase;

[0030] (4). The neutral organic phase is distilled under normal pressure to collect fractions at 320-360° C., and the fractions are washed with a strong oxidant—concentrated sulfuric acid 500 g until the organic phase is colorless or pale yellow, and then washed with water until neutral to obtain clarification of the organic phase;

[0031] (5). After drying the cla...

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PUM

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Abstract

The invention relates to a new method for synthesizing and purifying n-eicosane, comprising the following steps: (1) mixing bromo-n-butane and bromo-n-hexadecane; (2) after mixing petroleum ether and mixed liquor, adding sodium to carry out reflux reaction for 1-2h; (3) after dropwise adding absolute ethanol and water, separating organic phase and rinsing organic phase until organic phase is neutral; (4) distilling and collecting distillate at 320-360 DEG C, after washing the distillate until organic phase is colorless or light yellow, rinsing organic phase until organic phase is neutral; and (5) after drying and filtering the organic phase, absorbing, distilling at reduced pressure and collecting the intermediate n-distillate, namely the n-eicosane product. The raw materials adopted in the invention are sufficiently supplied in the market, thus effectively solving the problem that the yield is affected by tension supply of the raw materials; the requirements for process conditions and production equipment are low, thus reducing the investment in equipment and saving the fund; meanwhile, the product quality can be evidently improved while increasing the yield, thus further increasing the economic benefits.

Description

technical field [0001] The invention belongs to the field of chemical reagents, in particular to a new method for synthesizing and purifying n-eicosane. Background technique [0002] N-eicosane is one of the important chemical reagents needed in the process of oil analysis. At the same time, it is also one of the key components of the environmentally friendly liquid combustion composition. n-Eicosane can adjust the formula of the environmentally friendly liquid combustion composition and ensure its excellent quality, so it has been widely used. [0003] At present, the preparation of n-eicosane has the following methods: one, the method of separating n-eicosane by segmental freezing from the whole distillate naphtha; two, the preparation of symmetrical even-numbered n-alkanes by Wurtz reaction The method prepares n-eicosane; 3. The n-eicosane is prepared by using iodo-eicosane as a raw material and undergoing a reduction reaction. Among the above three methods, the first p...

Claims

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Application Information

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