Formaldehyde → HCID 91335, compound

Participants

Reaction Steps

When the process according to the invention is carried out without an aminal preliminary stage, introduction of the aqueous formaldehyde into the system is carried out after the solvent containing aniline has been mixed with the aqueous catalyst phase, which also contains aniline, and before the first reaction stage (5). In that case, the quantity of aqueous formaldehyde is generally calculated to provide a molar ratio of aniline/formaldehyde of from 1.5:1 to 25:1, the calculation of the molar aniline/formaldehyde ratio including both the aniline present in the solution of aniline in hydrophobic solvent which is introduced upstream of the first reactor (5) and the at least partially protonated aniline of the aqueous phase which is returned from the extractor (8) and is to be fed in at this point. High aniline/formaldehyde ratios within the broad ranges mentioned above are necessary for producing polyamines with a high diamine content. The aniline participating in the reactions is formally composed as follows:

Provenance & Evidence