Continuous direct preparation of nitrophenols

Details Continuous direct preparation of nitrophenols Continuous direct preparation of nitrophenols

1989-11-07

1991-07-09

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C20520, C07C20521

Patent

active

050307690

ABSTRACT:
Nitrophenols, in an isomer ratio para-nitrophenol/ortho-nitrophenol of at least 55/45, are continuously and directly prepared in steady state, by (a) establishing, in a confined reaction zone, an aqueous reaction solution including from 5% to 40% by weight of nitric acid, from 5% to 40% by weight of nitrous acid relative thereto, and an amount of nitrophenols within the limits of the solubility thereof in such reaction solution, (b) continuously introducing and reacting phenol and nitric acid into and with such reaction solution, at a rate of about 0.5 to 2.0 moles of nitric acid per mole of phenol, (c) maintaining the temperature in such confined reaction zone at a value ranging from about 10.degree. to about 40.degree. C. during such reaction, and (d) continuously withdrawing from such confined reaction zone admixture of para-nitrophenol and ortho-nitrophenol, in an isomer ratio para-nitrophenol/ortho-nitrophenol of at least 55/45.

REFERENCES:
patent: 3980717 (1976-09-01), Subluskey
patent: 4112005 (1978-09-01), Thiem et al.

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