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Novel method for producing sec-octene

A secondary octene and new method technology, applied in the field of organic synthesis, can solve the problems of low selectivity and conversion rate of secondary octene, unfavorable industrial production, difficult product separation, etc., and achieve convenient product separation, less by-products, and dehydration The effect of low reaction temperature

Inactive Publication Date: 2020-02-11
JIANGXI HUAYU AROMATIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After using the homogeneous dehydration method of water-soluble or alcohol-soluble catalyst, the product separation is more difficult and the post-treatment is complicated; the acidic solid catalyst is used as secondary octanol dehydration, the product separation is convenient, but the temperature of the dehydration process is high, and the target product secondary octene at low temperature The selectivity and conversion rate are not high, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the production of sec-octene in the invention, alumina supported by niobium pentoxide is used as the dehydration catalyst of sec-octanol. The preparation process of alumina loaded with niobium pentoxide is as follows: the selected alumina parameters are: bulk density: 1.04g / ml; pore volume: 0.37ml / g; particle size distribution less than 60μm: 68%; specific surface area: 142m 2 / g. The alumina carrier was impregnated with 3wt%d KOH solution at room temperature, washed with deionized water, dried and calcined. The pretreated alumina carrier is cooled to room temperature, impregnated with ammonium niobium oxalate solution, washed with water, dried, and then calcined at 250°C-550°C for 3-6 hours to obtain niobium pentoxide-supported alumina.

Embodiment 2

[0020] The alumina supported by niobium pentoxide is used as the secondary octanol dehydration catalyst, phenol is used as a polymerization inhibitor, and secondary octanol is used as a raw material to produce secondary octene. The specific steps are:

[0021] Step 1: First dehydration reaction and fractional distillation

[0022] Put secondary octanol, alumina and phenol supported by niobium pentoxide into the reaction kettle equipped with fractionation column, oil-water separator and reflux condenser respectively, start stirring, and start to reflux when the temperature of the reaction system rises to 160-185°C. When the dehydration reaction temperature drops to 130°C, the first dehydration reaction ends, and the generated water is discharged through the oil-water separator; the dehydration reaction product is fractionated through the fractionation device, and when the temperature of the discharge part of the fractionation condenser is 152°C, the fractionation is stopped. Th...

Embodiment 3

[0029] The method for producing secondary octene adopts alumina supported by niobium pentoxide as a secondary octanol dehydration catalyst, phenol is used as a polymerization inhibitor, and secondary octanol is used as a raw material to produce secondary octene. The specific steps are:

[0030] Step 1: First dehydration reaction and fractional distillation

[0031] Put secondary octanol, alumina and phenol supported by niobium pentoxide into the reaction kettle equipped with fractionation column, oil-water separator and reflux condenser respectively, start stirring, and start to reflux when the temperature of the reaction system rises to 160-185°C. When the dehydration reaction temperature drops to 125°C, the first dehydration reaction ends, and the generated water is discharged through the oil-water separator; the dehydration reaction product is fractionated by the fractionation device, and when the temperature of the discharge part of the fractionation condenser is 145°C, the...

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Abstract

The invention provides a novel method for producing sec-octene. According to the novel method for producing sec-octene, niobium pentoxide-doped aluminum oxide is adopted as a dehydration catalyst, phenol is adopted as a polymerization inhibitor, sec-octyl alcohol is adopted as a raw material, two-step continuous dehydration and fractionation are conducted, and then rectification is performed so asto obtain a sec-octene product with a purity of 99% or above, wherein the use amount of the niobium pentoxide-doped aluminum oxide is 0.1-0.5% of the mass of the sec-octyl alcohol, the use amount ofthe phenol is 0.1-0.5% of the mass of the sec-octyl alcohol, and a dehydration reaction temperature is 125-135 DEG C. The method has the advantages of simple production process, easy product separation, low dehydration temperature, high efficiency, low energy consumption and few byproducts in the production process, and easy realization of industrial clean production.

Description

technical field [0001] The invention relates to a new method for producing secondary octene, which specifically belongs to the technical field of organic synthesis. Background technique [0002] Second-octene is an important organic synthesis intermediate, mainly obtained by dehydration of second-octene. At present, sulfuric acid, p-toluenesulfonic acid, polyphosphoric acid-sulfuric acid, heteropolyacids, solid superacids, zeolites, etc. are generally used as catalysts for the dehydration of organic alcohols. After using the homogeneous dehydration method of water-soluble or alcohol-soluble catalyst, the product separation is more difficult and the post-treatment is complicated; the acidic solid catalyst is used as secondary octanol dehydration, the product separation is convenient, but the temperature of the dehydration process is high, and the target product secondary octene at low temperature The selectivity and conversion rate are not high, which is unfavorable for indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C11/02B01J23/22
CPCC07C1/24B01J23/22B01J23/002C07C2523/22C07C11/02
Inventor 俞忠华任向荣余喜彪周作良
Owner JIANGXI HUAYU AROMATIC TECH