Hydrogen catalyzed alkyl halide dehaloginating reducton process for preparing hydrocarbon

A technology of halogenated hydrocarbons and hydrogen, applied in chemical instruments and methods, catalyst carriers, physical/chemical process catalysts, etc., can solve the problems of difficult immobilization of inorganic precious metal salts, achieve high raw material conversion rate and product yield, and not easily Leaching, high activity effect

Inactive Publication Date: 2007-06-06
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

Chinese invention patent CN1613795A discloses a method for immobilizing water-soluble inorganic metal salts, which is very effective for inorganic non-noble metal salts, but difficult to achieve immobilization for inorganic noble metal salts such as palladium chloride and palladium nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In 5 mL of methanol solution containing 0.9% microencapsulated palladium chloride catalyst, 2 mmol of benzyl chloride was added, and a pressure of 0.1 MPa was introduced into the hydrogen gas, and the reactant was stirred at 60° C. for 1.5 hours, and the conversion rate of benzyl chloride was greater than 99%. The yield of the dechlorination product toluene is greater than 99%.

Embodiment 2

[0019] In 5mL containing the ethanol solution of 0.9% microencapsulated palladium chloride catalyst, add 2mmol benzyl chloride, feed the hydrogen gas that pressure is 0.1MPa, stir reactant 2 hours at 60 ℃, the conversion rate of benzyl chloride is 99%, The yield of its dechlorination product toluene is 99%.

Embodiment 3

[0021] In the tetrahydrofuran solution containing 0.9% microencapsulated palladium chloride catalyst in 5mL, add 2mmol benzyl chloride, feed the hydrogen gas that pressure is 0.5MPa, stir reactant 2.5 hours at 80 ℃, the conversion rate of benzyl chloride is greater than 99%, The yield of the dechlorination product toluene is greater than 99%.

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Abstract

The present invention discloses catalyzed hydrogen reduction process of alkyl halide to dehaloginate and produce hydrocarbon. The process adopts alkyl halide as main material, inorganic palladium salt microcapsule as catalyst in the amount of 0.01-2 %, methanol and ethanol, n-hexane or tetrahydrofuran as solvent, and has hydrogen as reductant in 0.1-2.0 MPa introduced to react at 20-120 deg.c for 1-10 hr. The present invention has reuse of inorganic palladium salt microcapsule as catalyst, and possesses the advantages of no pollution, mild condition, high operation safety, easy separation of the catalyst for reuse, etc.

Description

technical field [0001] The invention relates to the preparation of hydrocarbons, in particular to a method for preparing hydrocarbons by catalytic hydrogen reduction of halogenated hydrocarbons and dehalogenation. Background technique [0002] The dehalogenation of halogenated hydrocarbons has always been the direction of people's attention. It not only finds an effective solution for removing industrial highly toxic waste such as polychlorinated biphenyls, but also can be effectively used in organic synthesis. Metal hydrides, formic acid, hydrazine, Grignard reagents, etc. are used as reducing agents. These reducing agents can effectively dehalogenate halogenated hydrocarbons, but the required reagents are expensive and sensitive to air and humidity. Catalytic hydrogenation is the most commonly used method for hydrogenolysis and dechlorination of halogenated hydrocarbons, and the catalysts used are generally nickel and palladium. Nickel is used in large amounts due to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/30C07C15/06B01J23/44B01J32/00
CPCY02P20/52Y02P20/584
Inventor 纪红兵裴丽霞谢俊锋
Owner SOUTH CHINA UNIV OF TECH
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