Method for removing residual rhodium catalyst from hydrogenated nitrile rubber

A technology for hydrogenating nitrile butadiene rubber and rhodium catalysts, which is applied in the field of removing residual rhodium catalysts, can solve the problems of long treatment cycle time, large consumption, secondary pollution of hydrogenated nitrile butadiene rubber, etc., and achieves reduced consumption, reduced treatment period, and improved The effect of desorption efficiency

Inactive Publication Date: 2003-09-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] U.S. Patent 4,944,926 mentions a method for removing the rhodium catalyst in the hydrogenated nitrile rubber by adding organic additives, but if these additives are not completely separated from the hydrogenated nitrile rubber, it will cause damage to the hydrogenated nitrile rubber Secondary pollution
U.S. Patent 4,985,540 discloses a kind of chelating resin with a single functional group such as mercapto, thiourea, primary amine, secondary amine to remove rhodium catalyst in hydrogenated nitrile rubber, but its resin is used for continuous treatment of glue. Very large (1:3 resin:glue (dry basis)), long processing cycle time (54 hours)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The macroporous chelating resin is a copolymer of styrene-divinylbenzene, with a specific surface area of ​​500m 2 / g, pore volume is 0.75ml / g, average pore diameter: 200 Å; particle size distribution: 1~1.5mm (dry basis); bulk density: 880g / l (wet basis), with thiourea group, isosulfur Urea functional group.

[0017] With the above-mentioned thiourea group, the macroporous chelating resin of the isothiourea group functional group removes the rhodium complex catalyst in the HNBR, and the concrete process is as follows:

[0018] In the presence of a rhodium catalyst and a triphenylphosphine co-catalyst, the chlorobenzene solution of 6-25% nitrile rubber is hydrogenated to obtain HNBR.

[0019] Arrange about 10 g of macroporous chelating resin with thiourea group and isothiourea group in an ion exchange column with a length of about 20 cm and an inner diameter of about 1.0 cm. The ion-exchange column is preheated at 60-90°C, and 1000g of 6% HNBR glue is passed through t...

Embodiment 2

[0022] But with the macroporous chelating resin of about 10g same benzenediene-divinylbenzene copolymer as embodiment 1, have mercapto group, isothiourea functional group, remove residual rhodium catalyst in the HNBR glue solution with it, technological process As described in Example 1, the rhodium content in the treated HNBR is 20 ppm, and the removal rate of rhodium is 87%.

Embodiment 3

[0024] With the macroporous chelating resin of about 10g and embodiment 1 identical styrene-divinylbenzene copolymer but have mercapto group, thiourea group, isothiourea mixed functional group (mercapto group: thiourea group: isothiourea= 90-98: 2-8: 0-3). , remove residual rhodium catalyst in the HNBR glue solution with it, technological process is described with embodiment 1, rhodium content is 8ppm in the HNBR after processing, and the removal rate of rhodium is 94.8%.

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PUM

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Abstract

The present invention provides a process for removing rhodium catalyst from rubber liquor of hydrogenated nitrile rubber, and is characterized by that it adopts macroporous resin with special functional group to treat the above-mentioned rubber liquor or the hydrogenated nitrile rubber so as to can remove residual catalyst. Said functional group is the functional group containing two kinds of more than two kinds of mercapto-group, thiourea and isothiourea. It is specially suitable for industrial equipment, for industrial equipment, for example exchange column, to continuously treat rubber liquor.

Description

technical field [0001] The invention provides a process for removing residual rhodium catalyst from hydrogenated nitrile rubber glue. technical background [0002] Hydrogenated nitrile rubber (HNBR) refers to hydrogenation of nitrile rubber (NBR), at least 80% (preferably 90-99.5%) of the carbon-carbon double bonds are hydrogenated. Unsaturated nitrile rubber is a copolymer of monomers with nitrile groups (-C≡N) containing 3 to 5 Q and β unsaturated carbons and conjugated diene monomers containing 4 to 6 carbons. Typical examples It is an acrylonitrile-butadiene copolymer. Unsaturated nitrile rubber is obtained by free radical emulsion polymerization. A typical example is obtained by radical emulsion polymerization of acrylonitrile and butadiene, wherein the combined amount of butadiene and acrylonitrile is 80-85:20-50. [0003] Hydrogenated nitrile rubber is suitable to be prepared by catalytic hydrogenation of nitrile rubber with rhodium complex, because the hydrogenati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/08
Inventor 刘志才陈彩云龚光碧李锦山苏玲李晓鹏韩者芬王月霞周志平宋中勤苟文甲汤海鲲
Owner PETROCHINA CO LTD
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