Phthalic anhydride process and product

Details Phthalic anhydride process and product Phthalic anhydride process and product

1985-06-19

1987-04-21

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549250, C07D30789

Patent

active

046598421

ABSTRACT:
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.degree. and 155.degree. 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.degree. and 70.degree. 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.

REFERENCES:
patent: 1789967 (1931-01-01), Daniels et al.
patent: 1806715 (1931-05-01), Schwindt
patent: 1817304 (1931-08-01), Foster
patent: 1837869 (1931-12-01), Jewett et al.
patent: 1891754 (1932-12-01), Daniels et al.
patent: 1891891 (1932-12-01), Luft et al.
patent: 2064468 (1936-12-01), Foster
patent: 2436766 (1948-02-01), Davis
patent: 3326941 (1967-06-01), Campagne
patent: 4238428 (1980-12-01), Sasaki et al.
patent: 4435581 (1984-03-01), Miserlis
George et al., Journal of Crystal Growth, vol. 37, No. 2 (1977), pp. 189-193.

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