Heterogeneous catalysts for the direct carbonylation of nitro aromatic compounds to isocyanates

Patent metadata

Field	Value
Publication number	US-11512046-B2
Application number	US-201816499686-A
Country	US
Kind code	B2
Filing date	Apr 4, 2018
Priority date	Apr 5, 2017
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula AxBy wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.

First claim

The invention claimed is:

1. A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound, the process comprising
reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst,
wherein the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of formula A x B y , where:
A is at least one element selected from the group consisting of Ni, Ru, Rh, Pd, Ir, Pt and Ag,
B is at least one element selected from the group consisting of Sn, Sb, Pb, Zn, Ga, In, Ge and As,
x is in the range of 0.1 to 10, and
y is in the range of 0.1 to 10.

2. The process according to claim 1 , wherein
A is at least one element selected from the group consisting of Ni, Rh, Pd, Ir and Pt, and
B is at least one element selected from the group consisting of Sn, Sb, Pb, Ga and In.

3. The process according to claim 2 , wherein
A is Rh, and
B is at least one element selected from the group consisting of Pb, Sn and Sb.

4. The process according to claim 1 , wherein
the multi metallic material comprises at least one component C, which contains or consists of A or B not being part of the intermetallic phase A x B y .

5. The process according to claim 1 , wherein the multi metallic material comprises at least one component C, which contains or consists of one or more elements selected from the group consisting of O, N, C, H, Mg, Ca, Mn, Fe, Co, Ni, Zn, and Ga.

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

7. The process according to claim 1 , wherein the nitroaromatic compound is selected from the group consisting of nitrobenzene, dinitrobenzene, nitrotoluene, dinitrotoluene, trinitrotoluene, nitronaphthalene, nitroanthracene, nitrodiphenyl, and bis(nitrophenyl)methane.

8. The process according to claim 1 , which is carried out discontinuously.

9. The process according to claim 1 , which is carried out continuously.

Assignees

• Basf Se

Inventors

• Titlbach Sven
• Kuschel Andreas
• Lizandara Carlos
• Schunk Stephan A
• Rother Joerg
• Bechtel Juergen
• Drebov Nedko Stefanov
• Maixner Stefan
• Hinrichs Matthias
• Halabi Mohamed
• Mueller Imke Britta
• Fenyn Michaela

Classifications

• C07C265/12

  having isocyanate groups bound to carbon atoms of six-membered aromatic rings · CPC title

• B01J23/62

  with gallium, indium, thallium, germanium, tin or lead · CPC title

• B01J23/8892

  Manganese · CPC title

• C07C263/14 Primary

  by catalytic reaction of nitro compounds with carbon monoxide · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title