Aromatic polyamines and their preparation

Details Aromatic polyamines and their preparation Aromatic polyamines and their preparation

1969-12-12

1978-01-31

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 25AT, 260 25AQ, 260 775AM, 260453AM, 260453PH, C07C 8524

Patent

active

040715582

ABSTRACT:
A predetermined 2,4'-isomer content in a polyamine reaction mixture resulting from the aniline/formaldehyde condensation reaction can be achieved.
Aniline and formaldehyde can be condensed in the presence of solid acidic catalysts to form a mixture of the following amines: ##STR1## WHERE N IS AN INTEGER OF FROM 1 TO 3. The amount of 2,4'-isomer can be varied between 30 and 95 wt. % of the diamine component of the mixture by conducting the condensation reaction in the presence of an acid activated clay catalyst at a reaction temperature of about 80.degree. to about 300.degree. C. When the reaction is conducted in the presence of a silica-alumina cracking catalyst or a silica-magnesia catalyst, the 2,4'-isomer content can be varied from about 15 to about 50 wt. %. In using the latter class of catalyst it is possible to prevent formation of a secondary amine by conducting the condensation reaction at a lower temperature and then digesting at a temperature of from about 175.degree. to about 220.degree. C. for from about 1 to about 5 hours, depending upon the temperature used.

REFERENCES:
patent: 2511748 (1950-06-01), Smith et al.
patent: 2683730 (1954-07-01), Seeger et al.
patent: 2818433 (1957-12-01), Erickson
patent: 2950263 (1960-08-01), Abbotson et al.
patent: 2974168 (1961-03-01), Sharp et al.
Houben-Weyl, "Methoden der Organischen Chemie", 4th ed., vol. 14/2, pp. 293-295 (1963).

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