Process for preventing scale deposition

Details Process for preventing scale deposition Process for preventing scale deposition

1979-11-19

1981-07-07

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

260707, 260DIG35, 562408, 562485, B01D 4700

Patent

active

042772575

ABSTRACT:
A scale deposition from an aqueous slurry of naphthoquinone and phthalic acid can be prevented by adding fine crystals of phthalic acid to the aqueous slurry of naphthoquinone and phthalic acid collected, which slurry is obtained by contacting a gas resulting from a catalytic gas phase oxidation of naphthalene with water or a mother liquor recycled. The fine crystals of phthalic acid have diameters of less than 100.mu., preferably 10 to 40.mu., and can be in an aqueous slurry of phthalic acid pulverized by a pulverizer.

REFERENCES:
patent: 3370400 (1968-02-01), Hoffman et al.
patent: 3379741 (1968-04-01), Tschamper et al.

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