Claims
- 1. In the manufacture of cumene hydroperoxide (CHP) wherein cumene is oxidized to CHP, the improvement comprising refining the cumene hydroperoxide product stream containing, in weight percents, about 80 to about 89 CHP, about 0.6 to about 1.6 water, about 0.5 to about 2.0 acetophenone, about 2 to about 15 cumene, and about 5 to about 9 dimethylbenzyl alcohol to obtain a product substantially reduced in color, water, acetophenone, and dimethylbenzyl alcohol, by subjecting said product stream to a first evaporation step at a temperature of 150.degree. to 210.degree. F. and pressure of 2 to 10 mm Hg, passing the residue therefrom to a second evaporation step at a temperature of about 135.degree. to about 210.degree. F. and a pressure of about 0.5 to about 8 mm Hg, and condensing the vapors therefrom to recover a refined cumene hydroperoxide.
- 2. Method of claim 1 wherein the first evaporation step is performed at 3 to 7 mm Hg and 175.degree. to 195.degree. F. and the second evaporation step is performed at 1 to 3 mm Hg and 150.degree. to 185.degree. F.
- 3. Method of claim 1 wherein the first evaporation step is conducted in an evaporative system which minimizes exposure to heat and provides efficient heat transfer at a low temperature difference.
- 4. Method of claim 1 wherein the first and second evaporation steps are performed in a wiped-film evaporator.
- 5. Method of claim 1 wherein the product is reduced in color to <50 APHA.
- 6. Method of claim 1 wherein the feed stream also contains about 20-40 ppm of sodium, which is substantially reduced in the product obtained.
- 7. Method of claim 1 wherein the first and second evaporation steps are performed in a wiped-film evaporator with an internal condenser to minimize pressure drop.
Parent Case Info
This application is a continuation-in-part of co-pending application U.S. Ser. No. 780,756, filed Sept. 27, 1985, now abandoned and incorporated herein.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
843032 |
Aug 1960 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
780756 |
Sep 1985 |
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