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Catalyst for liquid phase hydrogenation of unsaturated alkene to prepare saturated alkane

A liquid-phase hydrogenation and unsaturated technology, applied in the chemical field, can solve the problems of low production efficiency, low conversion rate, high reaction temperature of gas phase reaction, etc., and achieve the effects of improving production efficiency, small loss of palladium, and mild conditions

Inactive Publication Date: 2018-08-17
HOSCIEN TECH TIANJIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas phase reaction has the disadvantages of high reaction temperature, low conversion rate, and low production efficiency. Therefore, it is a better method to prepare halogenated alkanes by selecting a suitable catalyst and using a liquid phase hydrogenation method for the addition reaction of unsaturated olefins.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A mixed carrier, characterized in that: the mixed carrier is made by a method comprising the following steps:

[0043] (1) Grinding and screening the activated carbon to select 10-500 micron particles as a carrier, measure 100ml activated carbon, pickle the activated carbon with 300ml 5% nitric acid, and take it out after stirring and refluxing for 6h in a water bath at a temperature of 80°C. Wash the acid-washed activated carbon with distilled water until the pH value is 6-7, and then dry it at 100°C;

[0044] (2) Add the dried activated carbon in 200ml of absolute ethanol, add 20ml of tetraethyl orthosilicate thereinto, after stirring evenly, add dropwise 32ml of ammoniacal liquor with a concentration of 25%, react at normal temperature for 12 hours, filter the solid obtained Wash with absolute ethanol three times, and the solid obtained after drying is the mixed carrier.

[0045] A liquid-phase hydrogenation catalyst for synthesizing saturated alkanes from unsaturat...

Embodiment 2

[0061] A mixed carrier, characterized in that: the mixed carrier is made by a method comprising the following steps:

[0062] (1) Grinding and screening the activated carbon to select 10-500 micron particles as a carrier, measure 100ml activated carbon, pickle the activated carbon with 250ml 7.5% nitric acid, and take it out after stirring and refluxing for 6h in a water bath at a temperature of 80°C. Wash the acid-washed activated carbon with distilled water until the pH value is 6-7, and then dry it at 100°C;

[0063] (2) Add the dried activated carbon in 150ml of absolute ethanol, add 25ml of tetraethyl orthosilicate therein, after stirring evenly, add dropwise 50ml of ammoniacal liquor with a concentration of 25%, react at normal temperature for 12 hours, and filter the obtained solid for use Wash with absolute ethanol three times, and the solid obtained after drying is the mixed carrier.

[0064] A liquid-phase hydrogenation catalyst for synthesizing saturated alkanes fr...

Embodiment 3

[0079] A mixed carrier, characterized in that: the mixed carrier is made by a method comprising the following steps:

[0080] (1) Grinding and screening the activated carbon to select 10-500 micron particles as a carrier, measure 100ml activated carbon, pickle the activated carbon with 200ml 10% nitric acid, and take it out after stirring and refluxing for 6h in a water bath at a temperature of 80°C. Wash the acid-washed activated carbon with distilled water until the pH value is 6-7, and then dry it at 100°C;

[0081] (2) Add the dried activated carbon in 250ml of absolute ethanol, add 15ml of tetraethyl orthosilicate therein, after stirring evenly, add dropwise 25ml of ammoniacal liquor with a concentration of 25%, react at normal temperature for 12 hours, filter the solid obtained Wash with absolute ethanol three times, and the solid obtained after drying is the mixed carrier.

[0082] A liquid-phase hydrogenation catalyst for synthesizing saturated alkanes from unsaturate...

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Abstract

The invention provides a catalyst for liquid phase hydrogenation of unsaturated alkene to prepare saturated alkane. The mixed carrier of the catalyst is prepared by following steps: (1) processing active carbon by nitric acid (5%), washing active carbon by purified water until the pH value reaches 6-7, and drying active carbon; and (2) adding dried active carbon into anhydrous ethanol, then addingethyl n-silicate, evenly stirring, dropwise adding ammonia water with a concentration of 10-25%, carrying out reactions for 12 hours at a room temperature, filtering, washing obtained solids by anhydrous ethanol for three times, and drying the solids to obtain the mixed carrier. The catalyst has the advantages that when the catalyst is applied to liquid phase hydrogenation of unsaturated alkene,the side reactions such as dehydrofluorination hydrogenation recorded in literature reports are prevented, and the product selectivity and catalyst stability are improved.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to a liquid-phase hydrogenation catalyst for synthesizing saturated alkanes from unsaturated olefins. Background technique [0002] Halogenated alkanes are an important class of fine chemicals, especially some fluorinated alkanes. Since they do not contain chlorine atoms, their ozone depletion potential (ODP value) is zero, and can be widely used in cleaning agents, refrigerants, foaming agents, and Fluorine solvents and other fields, but also an important fluorine-containing fine chemical intermediates. [0003] The hydrogenation reaction of unsaturated olefins is a common way to prepare halogenated alkanes, which is usually divided into two types: gas phase reaction and liquid phase reaction. The gas-phase reaction has the disadvantages of high reaction temperature, low conversion rate, and low production efficiency. Therefore, it is a better method to prepare halogenated alkanes by sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J32/00B01J37/02B01J37/08C07C19/08C07C17/354
CPCB01J21/18B01J23/002B01J23/892B01J32/00B01J37/0207B01J37/08C07C17/354C07C19/08
Inventor 韩红旗周欣悦
Owner HOSCIEN TECH TIANJIN CO LTD
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