C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/364, 260/607
C08G 73/00 (2006.01) C07C 209/02 (2006.01) C07C 209/64 (2006.01) C07C 211/14 (2006.01)
Patent
CA 2005964
ABSTRACT A process for reforming alkyleneamines to pre- dominantly linearly-extended polyalkylenepolyamines comprising contacting an alkyleneamine or mixture thereof with a catalyst under conditions such that a mixture of polyalkylenepolyamines enriched in linearly- -extended products is formed, said catalyst containing at least one compound selected from the group consisting of (a) Group VB metal oxides, (b) Group VB metal phosphates, (c) silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals, and (d) tungsten oxides, with the proviso that the silicates and tungsten oxides are essentially free of aluminum. For example, ethylenediamine is contacted with a catalyst of niobium phosphate or niobic acid under reaction conditions to yield predominantly non-cyclic polyethylenepolyamines. Unlike the prior art processes, the present process does not require the neutralization of hydrohalide salts and the disposal of a waste metal stream and does not 34,793-F produce water as a by-product. This process gives a high selectivity to linearly-extended polyalkylenepolyamines and simultaneously, a low selectivity to undesirable cyclic products. 34,793-F
Bowman Robert G.
Hartwell George E.
Molzahn David C.
Smart & Biggar
The Dow Chemical Company
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