Process for preparing 4-hydroxyacetophenone oxime with mother li

Details Process for preparing 4-hydroxyacetophenone oxime with mother li Process for preparing 4-hydroxyacetophenone oxime with mother li

1990-01-29

1991-02-19

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

564223, C07C25144

Patent

active

049946137

ABSTRACT:
A novel process is disclosed for the preparation of 4-hydroxyacetopheone oxime by reaction of 4-hydroxyacetophenone with a hydroxylamine in caustic wherein the mother liquor obtained after crystallization of the oxime together with the wash water is recycled back and reused. This invention illustrates the criticality of maintaining the reactants in certain critical mol ratios in order to obtain 4-hydroxyacetopheone oxime of acceptable color.

REFERENCES:
patent: 2237365 (1941-04-01), Schlack
patent: 3429920 (1969-02-01), Rooij
patent: 3808275 (1974-04-01), Hirose et al.
patent: 4507248 (1985-03-01), Mathew et al.
patent: 4524217 (1985-06-01), Davenport et al.
Shaheen, "Basic Practice of Chemical Engineering", Section 4.3 (1975).

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