2536-05-2

Basic information

• Product Name: 2,2'-methylenediphenyl diisocyanate
• Synonyms: 2,2'-methylenediphenyl diisocyanate;Benzene, 1,1-methylenebis2-isocyanato-;22MDI;1,1'-Methylenebis(2-isocyanatobenzene);Bisphenol F diisocyanate;Diphenylmethane-2,2'-diisocyanate;1,1'-Methylenebis[2-isocyanatobenzene], 2,2'-methylenediphenyl diisocyanate, diphenylmethane-2,2'-diisocyanate;3-amino-6-chloropyridine-2-thiol
• CAS NO: 2536-05-2
• Molecular Formula: C₁₅H₁₀N₂O₂
• Molecular Weight: 334.2857
• EINECS: 219-799-4
• Mol File: 2536-05-2.mol
• Article Data: 7

Chemical Properties

• Boiling Point: 379.3°Cat760mmHg
• Flash Point: 156.5°C
• Appearance: /
• Density: 1.13g/cm³
• Vapor Pressure: 5.92E-06mmHg at 25°C
• Refractive Index: 1.587
• CAS DataBase Reference: 2,2'-methylenediphenyl diisocyanate(CAS DataBase Reference)
• NIST Chemistry Reference: 2,2'-methylenediphenyl diisocyanate(2536-05-2)
• EPA Substance Registry System: 2,2'-methylenediphenyl diisocyanate(2536-05-2)

Safety Data

• Hazardous Substances Data: 2536-05-2(Hazardous Substances Data)

Usage

Uses

1,1''-Methylenebis[2-isocyanatobenzene] is an isoform of Methylene diphenyl diisocyanate used in the manufacture of polyurethane.

InChI:InChI=1/C15H10N2O2/c18-10-16-14-7-3-1-5-12(14)9-13-6-2-4-8-15(13)17-11-19/h1-8H,9H2

Upstream product

• 75-44-5 phosgene 
• 6582-52-1 2,2'-methylenedianiline 
• 101-77-9 4,4'-diamino diphenyl methane 
• 1208-52-2 2,4'-diaminodiphenylmethane 
• 50-00-0 formaldehyd 

Downstream Products

• 47636-24-8 dibutyl diphenyl methane-4,4’-dicarbamate 

Relevant articles and documents

PROCESS FOR PRODUCING DIAMINES AND POLYAMINES OF THE DIPHENYLMETHANE SERIES

The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline.

Process for the production of isocyanates

Isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), are produced by reaction of amines dissolved in a solvent with phosgene in the same solvent to form the corresponding isocyanates. Hydrogen chloride and excess phosgene are subsequently removed from the reaction mixture to obtain a crude isocyanate-containing solution. Subsequently, the crude isocyanate-containing solution is separated by distillation into isocyanates and solvent. The solvent is recycled and used for the production of solutions of the amines and of phosgene. The solvent being recycled is treated to reduce the phosgene and diisocyanate contents before being used for the production of the solution of the amine.

Process for distilling a mixture of isomeric diisocyanatodiphenylmethanes

Preparation of 2,4'-methylene diphenylene diisocyanate (MDI) comprises distillation of a diisocyanatodiphenylmethane isomer mixture from 2,2'-diisocyanatodiphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenylmethane to give a mixture comprising 2,4'-diisocyanatodiphenylmethane (85-99 wt.%), 4,4'-diisocyanatodiphenylmethane (up to 15 wt.%) and 2.2'-diisocyanatodiphenylmethane (up to 0.2 wt.%). Preparation of 2,4'-methylene diphenylene diisocyanate (MDI) (with less production of 2,4'-MDI) comprises distillation of a diisocyanatodiphenylmethane isomer mixture from 2,2'-diisocyanatodiphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenylmethane to give a mixture comprising 2,4'-diisocyanatodiphenylmethane (85-99 wt.%), 4,4'-diisocyanatodiphenylmethane (up to 15 wt.%) and 2.2'-diisocyanatodiphenylmethane (up to 0.2 wt.%) (where: distillation is carried out in a single-step; a partition column is used in at least one distillation stage; a destillative before separation is upstreamed to the partition column before distillation to give a mixture (comprising 2,2'-diisocyanatodiphenylmethane (0-15 wt.%), 2,4'-diisocyanatodiphenylmethane (12-60 wt.%) and 4,4'-diisocyanatodiphenylmethane (25-88 wt.%)), which is used as feed stream to the partition column; and the vapor at the top of the partition column is condensed and 98-99.6% of it returns to the top zone).