Process for manufacturing 2-pyrrolidone or N-alkylpyrrolidones

Details Process for manufacturing 2-pyrrolidone or N-alkylpyrrolidones Process for manufacturing 2-pyrrolidone or N-alkylpyrrolidones

1999-03-19

1999-12-28

Owens, Amelia

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548552, C07D20767

Patent

active

060083751

ABSTRACT:
A process for manufacturing gamma-butyrolactone by the catalytic hydrogenation of maleic anhydride, succinic anhydride or their acids in the vapor phase in the presence of catalysts based on copper oxide and aluminum oxide in reduced form is described. The process is characterized in that a catalyst is employed to conduct the reaction which is formed on the basis of 50 to 95 % by weight copper oxide, 3 to 30 % by weight aluminum oxide and 0 to 25 % by weight of a binder. Preferably the catalyst is formed on the basis of 83.5 to 85.5 % by weight copper oxide, 9 to 11 % by weight aluminum oxide, and 4.5 to 6.5 % by weight graphite. The reaction mixture obtained can be used directly without separating off the water, e.g. for manufacturing N-methylpyrrolidone.

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