A process for removing iron-residues, rhodium- and ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber

A nitrile rubber, ruthenium catalyst technology, applied in the field of removing iron residues, rhodium-containing and ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber, capable of solving the problem of catalyst removal, nitrile rubber solution is not an alternative, Cost and other issues

Inactive Publication Date: 2009-06-24
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a major disadvantage of such methods is the difficulty in removing the catalyst from the reaction mixture once the reaction is complete
However, for example in US 6,376,690, the use and introduction of additives such as dimethyl sulfoxide, if not completely removed after use, can be harmful if applied to a nitrile rubber solution which is then to be subjected to subsequent hydrogenation
Therefore, transfer of this method to NBR solutions is not a viable alternative
In addition, for a commercial process, the necessary silica gel filtration process results in multiple costs

Method used

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  • A process for removing iron-residues, rhodium- and ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber
  • A process for removing iron-residues, rhodium- and ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber
  • A process for removing iron-residues, rhodium- and ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber

Examples

Experimental program
Comparison scheme
Effect test

example 1-3 and comparative example 4

[0160] A hydrogenated nitrile rubber containing 34% by weight of acrylonitrile, less than 0.9% of residual double bonds and a Mooney viscosity (ML 1+4 at 100°C) of 65 was used, produced by adding a Nitrile butadiene rubber (34% by weight acrylonitrile, 66% butadiene) in RhCl (PPh 3 ) 3 (Ph = phenyl) is prepared by subjecting it to hydrogenation in the presence of a catalyst.

[0161] A 6.0% by weight solution of this hydrogenated nitrile rubber in monochlorobenzene was used as a standard for the following examples, and the term "hydrogenated nitrile rubber", as used in the following examples, refers to this solution.

[0162] In Examples 1-3, 0.5 g of the specified resin (see Table 1) was added together with 180 g of the hydrogenated nitrile rubber solution in a 500 ml three-necked round bottom flask. Each reaction mixture was stirred at about 100°C under nitrogen for 66 hours. The resin was then removed from the mixture by filtration and the rubber recovered by evaporatin...

example 5

[0168] A hydrogenated nitrile rubber containing 34% by weight of acrylonitrile, having less than 0.9% residual double bonds and a Mooney viscosity (ML 1+4 at 100°C) of 40 was used by adding a Nitrile butadiene rubber (34% by weight acrylonitrile, 66% butadiene) undergoes a metathesis process using a ruthenium-containing catalyst of general formula (III) and additionally reacts in RhCl (PPh 3 ) 3 (Ph = phenyl) is prepared by subjecting it to a subsequent hydrogenation process in the presence of a catalyst.

[0169] A 6.0% by weight solution of this hydrogenated nitrile rubber in monochlorobenzene, which was subjected to a metathesis process before hydrogenation, and the term "hydrogenated nitrile rubber", as here As used herein, this solution is referred to.

[0170] In a 500 ml three-necked round bottom flask, 0.5 g of a specified resin (see Table 1) was added together with 180 g of the hydrogenated nitrile rubber solution. The reaction mixture was stirred at about 100°C un...

example 7

[0176] A hydrogenated nitrile rubber containing 34% by weight of acrylonitrile, having less than 0.9% residual double bonds and a Mooney viscosity (ML 1+4 at 100°C) of 65 was used by adding a Nitrile butadiene rubber (34% by weight acrylonitrile, 66% butadiene) in RhCl (PPh 3 ) 3 (Ph = phenyl) is prepared by subjecting it to hydrogenation in the presence of a catalyst.

[0177] A 6.0% (by weight) solution of this hydrogenated nitrile rubber in monochlorobenzene was used as the standard for the following examples. The term "hydrogenated nitrile rubber", as used in the following examples, refers to this solution.

[0178] In a 500 ml three-necked round bottom flask, 0.5 g of a specified resin (as shown in Table 1) was added together with 180 g of the hydrogenated nitrile rubber solution. The reaction mixture was stirred at approximately 100° C. under nitrogen for various time intervals (see Table 4). The resin was then removed from the mixture by filtration and the hydrogenate...

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Abstract

A process is provided for the removal of iron-residues, rhodium- and / or ruthenium-containing catalyst residues from a solution of optionally hydrogenated nitrile rubber containing such iron-residues, rhodium- and / or ruthenium-containing residues by contacting such solution with a specific functionalized ion exchange resin.

Description

technical field [0001] The present invention provides a process for removing iron residues, rhodium-containing and ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber. Background technique [0002] Polymer hydrogenation is a well known procedure, as disclosed for example in US-A-4,396,761, US-A-4,510,293, US-A-5,258,467 and US-A-4,595,749. But the subsequent separation of the hydrogenation catalyst from the polymer is not always described in detail or not at all. [0003] More precisely, certain rhodium-containing catalysts are known to be particularly suitable for the selective hydrogenation of nitrile rubber (ie reduction of the carbon-carbon double bonds present in nitrile rubber without concomitant reduction of the carbon-nitrogen triple bond). Such hydrogenated nitrile rubbers are less susceptible to heat-induced degradation than unsaturated nitrile rubbers. [0004] For example, US-A-4,464,515 teaches that in a method for selectively hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C2/04
CPCC08C2019/09C08C2/04C08L15/005C08C2/00
Inventor 克里斯托弗·翁斯蒂芬·帕斯克弗朗茨-约瑟夫·默斯曼
Owner LANXESS DEUTDCHLAND GMBH
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