Lyondell Chemical Technology, L.p.

Prestone Products Corporation

Thomas W Weir

Andrew P Kahn

A method for purifying N-methyl-2-pyrrolidone is disclosed. The method comprises treating N-methyl-2-pyrrolidone with an alumina that desorbs less than 100 &#x3bc;mol/g of isobutylene between 225&#xb0; C. and 400&#xb0; C. in a standard tert-butyl alcohol dehydration test. The method enables the removal of at least about 80% of amine impurities or at least about 60% of APHA color from the NMP at 4 bed volumes treated.

Method for purifying N-methyl-2-pyrrolidone

The preparation of propylene glycol compositions containing alkali metal silicates having improved gel resistance is provided by forming a silicate premix having effective amounts of inorganic base compound(s) and water. The silicate premix is then added to the propylene glycol.

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Berwyn, PA, United States of America

Thomas W Weir