Process for the production of N-vinyl-2-pyrrolidone by vinylation
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United States of America Patent
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Oct 8, 2002
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N/A
app pub date -
Dec 29, 1998
filing date -
Dec 29, 1998
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Abstract
A single stage process, with recirculation of reactants, is provided herein for making N-vinylpyrrolidone or N-vinyl caprolactam at a high reaction rate and selectivity and at a predetermined conversion per pass. In this process a reaction mixture is formed by saturating a non-aqueous, liquid mixture of recirculating lactam, vinyl lactam and catalyst with acetylene at low temperatures and pressures to provide a high concentration of acetylene in the liquid, pumping the saturated solution into a reactor, reacting the mixture as a single liquid phase, cooling the reaction product, withdrawing a portion of the cooled product, recirculating the rest into the reaction mixture, and continuously feeding additional lactam and catalyst therein.
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