A supported catalyst having rhodium particles with an average diameter of less than 1 nm disposed on a support material containing magnetic iron oxide (e.g. Fe.sub.3O.sub.4). A method of producing the supported catalyst and a process of reducing nitroarenes to corresponding aromatic amines employing the supported catalyst with a high product yield are also described. The supported catalyst may be recovered with ease using an external magnet and reused.

The present invention relates to process for separating p-phenylenediamine from a mixture containing o-phenylenediamine, aminobiphenyls and diphenylamine by means of distillation coupled with crystallization, wherein the distillation system consists of two divided wall columns and the crystallization comprises at least one stage suspension-based melt crystallization. A liquid fraction enriched in p-phenylenediamine obtained as the side-draw of the first divided wall column is sent to the subsequent suspension-based melt crystallization to produce substantially pure p-phenylenediamine. The overhead product of the first divided wall column is fed to the second divided wall column to produce highly pure o-phenylenediamine withdrawn from the side-draw of the second divided wall column.

The present invention relates to process for separating p-phenylenediamine from a mixture containing o-phenylenediamine, aminobiphenyls and diphenylamine by means of distillation coupled with crystallization, wherein the distillation system consists of two divided wall columns and the crystallization comprises at least one stage suspension-based melt crystallization. A liquid fraction enriched in p-phenylenediamine obtained as the side-draw of the first divided wall column is sent to the subsequent suspension-based melt crystallization to produce substantially pure p-phenylenediamine. The overhead product of the first divided wall column is fed to the second divided wall column to produce highly pure o-phenylenediamine withdrawn from the side-draw of the second divided wall column.

The present invention relates to process for separating p-phenylenediamine from a mixture containing o-phenylenediamine, aminobiphenyls and diphenylamine by means of distillation coupled with crystallization, wherein the distillation system consists of two divided wall columns and the crystallization comprises at least one stage suspension-based melt crystallization. A liquid fraction enriched in p-phenylenediamine obtained as the side-draw of the first divided wall column is sent to the subsequent suspension-based melt crystallization to produce substantially pure p-phenylenediamine. The overhead product of the first divided wall column is fed to the second divided wall column to produce highly pure o-phenylenediamine withdrawn from the side-draw of the second divided wall column.

Disclosed is a functionalized graphene containing two or more amines having excellent electrical, thermal and mechanical properties by allowing good interfacial bonding force and uniform dispersion with a thermoplastic polymer, and a method for preparing the functional graphene. The functionalized graphene comprises a carbon material selected from the group consisting of graphene, reduced graphene, graphene oxide, and mixture thereof; and a monovalent amine group and a bivalent or higher amine group which are bonded to the carbon material.

Disclosed is a functionalized graphene containing two or more amines having excellent electrical, thermal and mechanical properties by allowing good interfacial bonding force and uniform dispersion with a thermoplastic polymer, and a method for preparing the functional graphene. The functionalized graphene comprises a carbon material selected from the group consisting of graphene, reduced graphene, graphene oxide, and mixture thereof; and a monovalent amine group and a bivalent or higher amine group which are bonded to the carbon material.

The present invention addresses the problem of providing a means for making highly sensitive and stable measurements possible using electrochemical measurement methods. This problem is resolved by providing: a labeling substance represented by general formula (1) and used to label a substrate; a measurement substrate that is formed by being labeled using the labeling substance; a method of measuring using electrochemical measurement methods that use the measurement substrate; and a reagent kit that includes as components the labeling substance and/or the measurement substrate. ##STR00001##
(In general formula (1), R.sub.1 is either H or an alkyl group (C.sub.mH.sub.2m+1), m is an integer of 1-4, R.sub.2 is an alkyl group (C.sub.nH.sub.2n+1), and n is an integer of 1-4.)

The present invention addresses the problem of providing a means for making highly sensitive and stable measurements possible using electrochemical measurement methods. This problem is resolved by providing: a labeling substance represented by general formula (1) and used to label a substrate; a measurement substrate that is formed by being labeled using the labeling substance; a method of measuring using electrochemical measurement methods that use the measurement substrate; and a reagent kit that includes as components the labeling substance and/or the measurement substrate. ##STR00001##
(In general formula (1), R.sub.1 is either H or an alkyl group (C.sub.mH.sub.2m+1), m is an integer of 1-4, R.sub.2 is an alkyl group (C.sub.nH.sub.2n+1), and n is an integer of 1-4.)

A monomer represented by Chemical Formula 1-1 ##STR00001##
wherein in Chemical Formula 1-1, Z, L.sup.1, L.sup.2, R.sup.1 to R.sup.6, n, m, p, and a to f are the same as defined in the detailed description.

A monomer represented by Chemical Formula 1-1 ##STR00001##
wherein in Chemical Formula 1-1, Z, L.sup.1, L.sup.2, R.sup.1 to R.sup.6, n, m, p, and a to f are the same as defined in the detailed description.