Formaldehyde → HCID 66680619, compound

HRID 2369476Notes

Reaction equation

HRID 2369476 reaction equation
[N-]=C=O.[N-]=C=O.C1([CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)C=CC=CC=1.[N+:20]([C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)([O-])=O.NC1C=CC=CC=1.C=O>C1C=CC=CC=1>[CH2:13]=[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]1[NH:20][C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1

Participants

6

Reactant 4

HCID 712FormaldehydeHCID 6115Aniline2×HCID 7416NitrobenzeneHCID 19824838Benzylbenzene diisocyanate

Product 1

HCID 66680619HCID 66680619, compound

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent2×

Procedure

The invention relates to a process for preparation and distillative workup of diphenylmethane diisocyanate, referred to hereinafter as MDI for short, proceeding from a benzene-comprising feed stream, in which benzene is nitrated to nitrobenzene which is hydrogenated to aniline, aniline is reacted with formaldehyde to give methylenediphenylamine (MDA) and MDA is phosgenated to MDI. In this process, not the pure products but at first product mixtures are obtained in each process step, which are purified before further processing.

Sources & evidence

ORD record
ord-362ece2e443f40339bab5b3cf4b70378
Source dataset
uspto-grants-2014_04
Patent number
US08703997B2

Reaction notes

Loading…