Method for preparing coumarin

Details Method for preparing coumarin Method for preparing coumarin

1976-04-26

1977-07-19

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

210274, 210305, C07D31110

Patent

active

040368548

ABSTRACT:
A filter having a peripheral skirt extending above and below the filter element, provides a gaseous cushion which prevents clogging the filter. The peripheral edges of the filter may have means for preventing entry of solid in the narrow space between the skirt wall and the filter edge. The filter can be part of an entry or exit port in the base of a crystallizer in which crystals are formed, washed, melted and filtered in a single unit. A reactor containing the novel filter is also useful for carrying reactions using heterogeneous catalysts and reactions in which an initially homogeneous catalyst becomes nonhomogeneous during the reaction.

REFERENCES:
patent: 3631067 (1971-12-01), Nankee et al.

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