Granted Patent B2

US 12,415,780 · App. 17/979,955 · Granted Sep 16, 2025

Inventors: Sven Titlbach (Heidelberg, DE); Andreas Kuschel (Heidelberg, DE); Carlos Lizandara (Ludwigshafen am Rhein, DE); Stephan A. Schunk (Heidelberg, DE); Joerg Rother (Heidelberg, DE); Juergen Bechtel (Heidelberg, DE); Nedko Stefanov Drebov (Ludwigshafen am Rhein, DE); Stefan Maixner (Ludwigshafen am Rhein, DE); Matthias Hinrichs (Ludwigshafen am Rhein, DE); Mohamed Halabi (Ludwigshafen am Rhein, DE); Imke Britta Mueller (Ludwigshafen am Rhein, DE); Michaela Fenyn (Ludwigshafen am Rhein, DE)

Assignee: BASF SE

C07C263/14B01J23/62B01J23/626B01J23/628B01J23/6445B01J23/6562B01J23/8892B01J37/0215B01J37/035B01J37/08B01J37/16

Abstract

Claims (20)

1. A catalyst for direct carbonylation of a nitroaromatic compound to a corresponding aromatic isocyanate, the catalyst containing a multi metallic material comprising one or more binary intermetallic phases of formula AxBy wherein:

A is Rh,

B is at least one element selected from the group consisting of Sn, Sb, Pb,

x is in the range 0.1-10,

y is in the range 0.1-10.

2. The catalyst according to claim 1 , wherein the multi metallic material comprises at least one component C, wherein component C contains A or B not being part of the intermetallic compound AxBy.

3. The catalyst according to claim 1 , wherein the multi metallic material comprises at least one component C, wherein component C contains at least one elements selected from the group consisting of O, N, C, H, Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba.

4. The catalyst according to claim 1 , wherein the multi metallic material comprises at least one binary intermetallic crystalline phases selected from the group consisting of RhPb, RhPb2, Rh4Pb5, Rh2Sn, RhSn, RhSn2, RhSn4, Rh2Sb, RhSb, RhSb2, RhSb3.

5. The catalyst according to claim 4 , wherein the multimetallic material comprises at least one binary intermetallic crystalline phases selected from the group consisting of RhPb, RhPb2, RhSb, Rh2Sb, RhSb2 and Rh2Sn.

6. The catalyst according to claim 1 wherein the multi metallic material is deposited on a carrier material.

7. A process for the production of a catalyst as defined in claim 6 comprising steps (i) to (iv):

(i) providing one or more precursors for elements A and B and optionally component C in the form of a solution;

(ii) depositing the metal precursors on a support material to form a composite material;

(iii reductive treatment of the composite material;

(iv) thermal treatment of the composite material.

8. The process according to claim 7 , wherein the solution comprises one or more solvents selected from the group consisting of water, alcohols, polyols, acids and bases.

9. The process according to claim 7 comprising the steps:

(iii) contacting the support material containing the metal precursors with one or more of reducing agents in solid, liquid or gaseous form selected from alcohols, hydrocarbons, amines, polyols, Zn-powder, H 2 , CO, CH 4 and C 2 H 4 , and

(iv) reducing the support material containing the metal precursors by thermal reduction under chemically inert conditions.

10. The process according to claim 9 , wherein step (iii) and (iv) are carried out in one single step.

Assignments (3)

Priority Claims (1)

Continuity (2)

References Cited (47)