The present invention relates to a catalyst for fixed bed aniline rectification residue recycling and preparation method thereof. Based on the total weight of the catalyst, the catalyst comprises the following components in percentage by weight: 5-40% of an active component, 2-30% of a first cocatalyst component, 10-30% of a second cocatalyst component and the balance of carrier, wherein the active component is NiO; the first cocatalyst component is one or more of Fe, Mo, Cr or Co oxide; and the second cocatalyst component is one or more of La, Zr, Y or Ce oxide. The catalyst is prepared through co-precipitation. The catalyst shows high activity and stability in the waste liquid treatment process, and can still maintain high rectification residue cracking rate after reaction of 200 hours.

The present invention relates to a catalyst for fixed bed aniline rectification residue recycling and preparation method thereof. Based on the total weight of the catalyst, the catalyst comprises the following components in percentage by weight: 5-40% of an active component, 2-30% of a first cocatalyst component, 10-30% of a second cocatalyst component and the balance of carrier, wherein the active component is NiO; the first cocatalyst component is one or more of Fe, Mo, Cr or Co oxide; and the second cocatalyst component is one or more of La, Zr, Y or Ce oxide. The catalyst is prepared through co-precipitation. The catalyst shows high activity and stability in the waste liquid treatment process, and can still maintain high rectification residue cracking rate after reaction of 200 hours.

The present invention relates to a process for hydrogenating 4,4-methylenedianiline and/or polymeric MDA with hydrogen in the presence of a catalyst comprising ruthenium on a zirconium oxide support material, and also to the use of a catalyst comprising ruthenium on a zirconium oxide support material for hydrogenating 4,4-methylenedianiline and/or polymeric MDA.

The present invention relates to a process for hydrogenating 4,4-methylenedianiline and/or polymeric MDA with hydrogen in the presence of a catalyst comprising ruthenium on a zirconium oxide support material, and also to the use of a catalyst comprising ruthenium on a zirconium oxide support material for hydrogenating 4,4-methylenedianiline and/or polymeric MDA.

The present invention relates to a process for hydrogenating 4,4-methylenedianiline and/or polymeric MDA with hydrogen in the presence of a catalyst comprising ruthenium on a zirconium oxide support material, and also to the use of a catalyst comprising ruthenium on a zirconium oxide support material for hydrogenating 4,4-methylenedianiline and/or polymeric MDA.

A method of preparing a hydrogenation catalyst, for example, a phthalate hydrogenation catalyst, comprising nebulizing a liquid containing a noble metal and a chelating agent comprising at least one nitrogen-containing functional group to form a nebulized liquid, and contacting the nebulized liquid with silica particles; a hydrogenation catalyst prepared by that method; and a method of hydrogenating unsaturated hydrocarbons, such as phthalates, in which an unsaturated hydrocarbon is contacted with hydrogen gas in the presence of the hydrogenation catalyst of the invention.

A method of preparing a hydrogenation catalyst, for example, a phthalate hydrogenation catalyst, comprising nebulizing a liquid containing a noble metal and a chelating agent comprising at least one nitrogen-containing functional group to form a nebulized liquid, and contacting the nebulized liquid with silica particles; a hydrogenation catalyst prepared by that method; and a method of hydrogenating unsaturated hydrocarbons, such as phthalates, in which an unsaturated hydrocarbon is contacted with hydrogen gas in the presence of the hydrogenation catalyst of the invention.

Disclosed is a method for preparing diamino-dicyclohexyl methane (H.sub.12MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4-MDA used as the starting material is firstly hydrogenated to prepare 4,4-H.sub.12MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4-MDA to the mixture of 2,4-MDA and 4,4-MDA, and then when the conversion is stabilized, the feed is switched to 4,4-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4-MDA and 4,4-MDA. 4,4-H.sub.12MDA having the trans-trans isomer content of 1624 wt % is produced, and the mixture of 2,4-H.sub.12MDA and 4,4-H.sub.12MDA is also produced, wherein the content of 2,4-H.sub.12MDA in the mixture is 415 wt %.

Disclosed is a method for preparing diamino-dicyclohexyl methane (H.sub.12MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4-MDA used as the starting material is firstly hydrogenated to prepare 4,4-H.sub.12MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4-MDA to the mixture of 2,4-MDA and 4,4-MDA, and then when the conversion is stabilized, the feed is switched to 4,4-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4-MDA and 4,4-MDA. 4,4-H.sub.12MDA having the trans-trans isomer content of 1624 wt % is produced, and the mixture of 2,4-H.sub.12MDA and 4,4-H.sub.12MDA is also produced, wherein the content of 2,4-H.sub.12MDA in the mixture is 415 wt %.

Disclosed is a method for preparing diamino-dicyclohexyl methane (H.sub.12MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4-MDA used as the starting material is firstly hydrogenated to prepare 4,4-H.sub.12MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4-MDA to the mixture of 2,4-MDA and 4,4-MDA, and then when the conversion is stabilized, the feed is switched to 4,4-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4-MDA and 4,4-MDA. 4,4-H.sub.12MDA having the trans-trans isomer content of 1624 wt % is produced, and the mixture of 2,4-H.sub.12MDA and 4,4-H.sub.12MDA is also produced, wherein the content of 2,4-H.sub.12MDA in the mixture is 415 wt %.