C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/365, 260/374
C07D 307/89 (2006.01) C07C 51/573 (2006.01) C07C 63/16 (2006.01)
Patent
CA 1236471
TITLE PHTHALIC ANHYDRIDE PROCESS AND PRODUCT ABSTRACT OF THE DISCLOSURE A phthalic anhydride product having a particle configuration made up of a mixture of spheroids, needle-like crystals, and amorphous particles is produced by feeding molten phthalic anhydride at a temperature between 131° and 155° into a spray nozzle in a closed cycle congealing chamber. The molten phthalic anhydride is discharged from the spray nozzle into a co-current or counter-current flow of inert gas at a temperature between -10° and 70°C, in order to congeal the product, which is then removed and transferred to a hopper or other storage means. For nozzle orifices having a diameter from 1 to 4 mm, discharge pressures of between 10 and 300 pounds per square inch are employed. In an especially preferred embodiment, the needle-like crystalline configurations are disjoined from the spheroids, thereby increasing the bulk density of the product, which in all embodiments exhibits the combination of superior flowability and more rapid dissolution, when compared with prior art products.
511975
Calabrese Frank A.
Vahlenkamp Hans H.
Basf Corporation
Gowling Lafleur Henderson Llp
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