Hydrochloric Acid → 2-Propanone, 1-(2-nitrophenoxy)-

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

The following materials are combined in a 1000 gallon vessel and heated at 65° C. for 6–8 hours: 499.0 kg (1.000 mole equiv.) of o-Nitrophenol (o-NP, 99%, 3.551 kg-moles), 359.7 kg (1.05 mole equiv.) of chloroacetone (CA, 96%, 3.733 kg-moles), 45.4 kg (0.124 mole equiv.) of sodium bromide (0.441 kg-moles), 328.9 kg (1.102 mole equiv.) of sodium bicarbonate (3.915 kg-moles), 27.2 kg (0.023 mole equiv.) of aqueous tributylmethylammonium chloride (TBMAC, 70%, 0.081 kg-moles), and 989 kg of toluene. The reaction is checked for completion and a trim charge of chloroacetone is added if necessary. Then 682 kg of water are added at 60° C. and the pH of the reaction mixture is adjusted to pH 6.5 –7.0 at 55 to 60° C. (about 66 kg of 10% HCl). The phases are separated and the heavier aqueous phase is removed. A 5–15% NaCl solution (725 kg) is added to the organic phase, the mixture is agitated at 55 to 60° C. and the phases are separated again by decantation. The remaining organic phase of crude o-NPA is vacuum stripped at 65–75° C. to remove toluene and volatile impurities. Toluene (about 70 kg) is added towards the end of the vacuum strip and stripped off again to improve the removal of volatile impurities. About 691 kg of crude o-NPA (96.9% assay, 3.428 kg-moles, 96.5% yield rel. o-NP) are obtained. Finally 339 kg of a toluene/isopropanol (8:2) mixture is added at 55–65° C. to the crude o-NPA melt to obtain approximately a 65% o-NPA solution. This solution is transferred to a hold vessel where it is held at 65° C. for step b.

Herkunft & Nachweise