C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/267.1, 260/6
C07C 211/13 (2006.01) C07C 209/16 (2006.01) C07D 241/04 (2006.01) C07D 295/04 (2006.01) C08G 73/02 (2006.01)
Patent
CA 1293255
WATER ADDITION TO ENHANCE PHOSPHORIC ACID SALT CATALYST ACTIVITY ABSTRACT OF THE DISCLOSURE A method for enhancing tile catalytic activity retention of a phosphorus acid salt catalyst, especially a metal acid phosphate during the production of polyalkylene polyamines from the reaction of a feed of (i) ammonia and/or an allkyleneamine compound having at least two amino groups, such as, ethylenediamine, and (ii) an alkanolamine having at least one amino group, such as, ethanolamine. Sufficient water is utlllzed in the feed to enhance the catalytic activity retention of the phosphorus acid salt catalyst. When a metal acid phosphate catalyst is used, the water keeps the metal acid phosphate in the acidic state and/or returns the metal acid phosphate to the acidic state. The re- action is conducted in tile gas phase, in the presence of a catalytically effective amount of phosphorus acid salt catalyst and at a temperature sufficient to form the polyalkylene polyamines. Also, when the phosphorus acid salt catalyst has sustained a decrease in the activity during the production of polyalkylene polyamine, water can be added in sufficient amount to increase the activity of the catalyst.
505712
Doumaux Arthur Roy Jr.
Gibson Charles Arnold
Sim & Mcburney
Union Carbide Corporation
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