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Organic solvent-free hydrogenation of diene-based polymers

A polymer and conjugated diene technology, applied in the field of hydrogenation of carbon-carbon double bonds, can solve the problems of no research on hydrogenation of diene-based polymers, slow reaction rate, etc.

Inactive Publication Date: 2010-09-15
SHANDONG YUHUANG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But apart from Gilliom's study (where the reaction rate is very slow and the catalyst is still added to the polymer with organic solvents), there is no study on the hydrogenation of diene-based polymers without the use of organic solvents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A 300 ml glass lined stainless steel autoclave with temperature control, stirrer and hydrogen addition point was used. 0.6 g of butadiene-acrylonitrile polymer with a limited acrylonitrile content of about 38% by weight and a Mooney viscosity (ML1+4 @ 100°C) of about 50 was used in the form of loose pellets 1-2 mm in diameter. Use 0.003g of catalyst RhCl (PPh 3 ) 3 and 0.03 g of triphenylphosphine. A temperature of 145°C and a hydrogen pressure of 500 psi (3.4 MPa) were applied for 6 hours. The system was then cooled, depressurized, and all polymer particles were removed from the reactor, dissolved in methyl ethyl ketone, and the degree of hydrogenation determined by infrared analysis of the hydrogenated polymer and further confirmed by NMR. A degree of hydrogenation of 97.9% was obtained and no gels were produced in the hydrogenated polymer.

Embodiment 2

[0048] The same procedure as described in Example 1 was used, but with a reaction time of 3 hours. The degree of hydrogenation was 89%, and no gel was produced in the hydrogenated polymer.

Embodiment 3

[0050] The same procedure as described in Example 1 was used, but the reaction time was 1 hour and the reaction temperature was 160°C. A degree of hydrogenation of 77.6% was obtained, and no gel was produced in the hydrogenated polymer.

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Abstract

A process is provided for the hydrogenation of carbon-carbon double bonds in polymers by treatment of the polymers with hydrogen in the presence of rhodium-based catalysts and in the complete absence of organic solvent.

Description

technical field [0001] The present invention relates to a process for the hydrogenation of carbon-carbon double bonds in polymers. Background technique [0002] It is known that treating a polymer in organic solution with hydrogen gas in the presence of a catalyst can successfully hydrogenate the carbon-carbon double bonds in the polymer. The method is selective to the double bonds being hydrogenated, eg, does not hydrogenate double bonds within aryl or cycloalkyl groups and does not affect double or triple bonds between carbon and other atoms such as nitrogen or oxygen. There are many examples of catalysts suitable for this hydrogenation in the art, including those based on cobalt, nickel, rhodium, osmium and ruthenium. The suitability of the catalyst depends on the desired degree of hydrogenation, the rate of the hydrogenation reaction and the presence of other groups such as carboxyl and nitrile groups in the polymer. [0003] US 6 410 657 teaches a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/04C08F36/04C08F212/08C08F220/44C08F220/10C08C19/02
CPCC08C19/02C08F8/04C08F36/00C08F12/00
Inventor G·L·伦佩尔潘勤敏吴家龙
Owner SHANDONG YUHUANG CHEM CO LTD