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Metal catalyst and hydrogenation method employing the same

a metal catalyst and hydrogenation method technology, applied in the field of bimetallic catalytic systems, can solve the problems of high cost and comparatively low selectivity of metal catalysts, and achieve the effect of similar activity and selectivity and lower cos

Active Publication Date: 2007-07-05
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The invention provides a bimetallic catalyst for hydrogenating unsaturated copolymers, the catalyst having similar activity and selectivity as rhodium (Rh) complexes, but is much lower in cost.
[0009]The invention further provides an improved method of hydrogenating unsaturated copolymer under mild conditions, with carbon-carbon double bonds of unsaturated copolymer hydrogenated for enhanced heat resistant, oxidation resistant and chemical resistant.
[0010]The invention also provides a method of forming hydrogenated nitrile-butadiene rubber with high efficiencies and decreased costs.

Problems solved by technology

Rhodium catalyst provides high hydrogenation efficiency and selectivity, while their drawback is high cost.
The advantage of Ru complex catalyst is its high catalytic activity in hydrogenation, with the drawback of comparatively low selectivity due to side reactions and gel formation.

Method used

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  • Metal catalyst and hydrogenation method employing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022]First, under a nitrogen atmosphere, 3.12 g (12 mmloe) of triphenyl phosphine (PPh3) and 22 g of absolute ethanol were added into a reaction vessel (Schlenk tube) equipped with a stirrer, a reflux condenser and placed in a thermostatic bath (70° C.). The reaction vessel was heated up for the dissolution of PPh3.0.352 g (1 mmole) of IrCl3.xH2O and 0.24 g (1 mmole) of RuCl3.xH2O) were then dissolved in 4 g of absolute ethanol and the resultant solution was added to the reaction vessel and reacted at reflux temperature for 4 hours. The solution was then cooled down to room temperature, and pumped to remove all the volatile. The dark brown solid was obtained and stored under a nitrogen atmosphere. A bimetallic catalyst A was produced by steps above. Molecular ratio of iridium and ruthenium in the bimetallic catalyst was 1:1.

example 2

[0024]A solution of nitrile butadiene rubber (NBR; product number is Nancar produced and sold by Nantex Industry Co., Ltd., 7 g of NBR / 43 ml xylene) was added to a 0.2 L stainless autoclave. The stainless autoclave was repeatedly purged by nitrogen and hydrogen gas for three times, respectively. A solution, 0.42 wt % of bimetallic catalyst A of [example1] was added to the stainless autoclave. The hydrogen pressure of the stainless autoclave was then increased to 0.2 Mpa, followed by heating. After the temperature of the stainless autoclave reached 120° C., the hydrogen pressure of the stainless autoclave was adjusted to 0.8 MPa, and the solution was then stirred vigorously for 4 hours under this condition. During the reaction, the hydrogen gas was supplied to maintain the constant pressure. After reaction, the product was precipitated by isopropyl alcohol, and vacuum dried for 24 hours at room temperature. The reaction formula in example 2 is:

[0025]Thereafter, the product was dissol...

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Abstract

A metal catalyst for hydrogenating unsaturated carbon-carbon bonds of copolymer is provided. The metal catalyst is a bimetallic complex comprising iridium and ruthenium. The metal catalyst has a formula comprising M1aM2bXm(L1)n, wherein the M1 is iridium, M2 is ruthenium; X is hydrogen, chlorine, bromine, iodine or pseudo halide; L1 is phosphine , bisphosphine, arsane or organic with nitrogen, sulfur and oxygen.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to bimetallic catalytic systems and their applications, and in particular to selectively hydrogenate olefinic unsaturation in diene polymers and copolymers, comprising nitrile rubber (acrylonitrile-butadiene rubber; NBR)[0003]2. Description of the Related Art[0004]Selective hydrogenation of unsaturated carbon-carbon double bonds of nitrile rubber results in a product that is resistant to oils, ozone and sour gases, while maintaining a high service temperature. As a result, such compositions find particular utility in automotive applications like oil seals, timing belts and hoses, in which formed rubber products are exposed to adverse environments and sustained high temperatures. Thus, it is desirable to produce a hydrogenated nitrile rubber (HNBR) composition having the advantageous mechanical and resistance properties described above.[0005]Hydrogenation of NBR is usually effected by hydrogen in an...

Claims

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Application Information

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IPC IPC(8): C08F20/44
CPCB01J31/1805B01J31/1895B01J31/2208B01J31/2234B01J2531/827B01J31/24B01J31/2404B01J2231/645B01J2531/821B01J31/226
Inventor SHIH, KUO-CHENCHEN, HUNG-YUSU, TSAI-TIEN
Owner IND TECH RES INST