SU760747A1 - Semiconductor microrefrigerator - Google Patents

Description

The invention relates to catalysts for the selective hydrogenation of chlorine nitroaromatic compounds of the benzene series. five

, -.-, 1 ...... Homogeneous catalyst known

for the hydrogenation of substituted nitrobenzenes, which are complex compounds of Pc or P8 with oxo-substituted naphthoquinones, dissolved in dimethylformamide. In the presence of this catalyst, 2,4-dinitrocholorbeneol is hydrogenated to form 2,4-diamino chlorobenzene with hydrogen [1].

However, this catalyst has. low stability and in the process of hydrogenation is destroyed with the release of metal.

Another known homogeneous catalyst for the hydrogenation of chlorine-substituted. nitrobenzenes is the complex compound Ki C {(C ₆ H ₅ ) s dissolved in a mixture of benzene-ethyl

.alcohol. In the presence of this catalyst, η-chloronitrobenzene is hydrogenated to 25 η-chloroaniline with a conversion of 100% and selectivity of 86% at 105-135 ° C and a hydrogen pressure of 80-100 atm [2].

The closest to the proposed is a homogeneous catalytic system

2 "" ..... '

for the selective hydrogenation of chloronitroaromatic compounds of the benzene series, consisting of a compound of group VIII (iridium compound), a ligand (chloroanilic acid), aliphatic alcohol and water.

In the presence of this system, chloronitroaromatic compounds are hydrogenated at atmospheric pressure and 22-90 ° C with a selectivity of 98.5-99.8%. For hydrogenation use 1 · 10 ' ² -5 10 ² g-at. iridium per 1 mol of the hydrogenated compound, and the specific activity of the catalytic system is 1.5-14.2 mol H ₂ / min-g-at [g].

The purpose of the invention is to increase the activity of the catalytic system.

Claims (1)

This' aim is achieved in that the homogeneous catalyst system comprises a group VIII metal compound which is used as KS1 _minutes; a ligand, which is used as an adduct of chloranilic acid with an amine of the general formula C ₆ N _g 0 ₄ Cl ₂ · 2C ₄ H ₅ MH ₂ or C, N _g 0dC1 ₂ · pCINdLk ^- , where n = 1-2; К = 0Н, С1, Н ₂ Р0д, at the following molar ratio of components: rhodium chloride: adduct of chloranilic acid with