The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 1991
Filed:
May. 15, 1989
Ronald Pierantozzi, Orefield, PA (US);
Mildred A Miller, N. Catasauqua, PA (US);
Mark L Listemann, Whitehall, PA (US);
Thomas R Gaffney, Allentown, PA (US);
Charles G Coe, Macungie, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
Amides having different molecular kinetic diameters or heats of adsorption, such as formamide and N-(1-alkoxyethyl)formamide, are separated under mild conditions with a molecular sieve which selectively adsorbs one of the amides, such as formamide. N-vinylformamide can be purified by removing formamide remaining in synthesis process streams using this technique. The adsorbed amide can be desorbed by heating the molecular sieve in either inert or reactive atmospheres. Preferred molecular sieves include the zeolites of types A, X, Y, molecular sieves of the MFI topology, chabazite, and mordenite. Calcium chabazite is particularly versatile and effective.