Oximation of KA oil by-product
View Patent ↗The present disclosure provides methods for separating ketones and alcohols. In one embodiment, the methods and compositions disclosed are useful in separating cyclohexanol from cyclohexanone. In one embodiment, cyclohexanone is converted to its corresponding oxime by treating the cyclohexanone with hydroxylamine. The resulting cyclohexanone oxime is then separated from the cyclohexanol, providing streams of cyclohexanol and cyclohexanone oxime.
1. A process for separating an alcohol from a ketone/alcohol mixture comprising the steps of:
reacting phenol with hydrogen to produce a first stream comprising cyclohexanone and cyclohexanol, wherein the first stream has a ratio of the weight of cyclohexanone to the weight of cyclohexanol from 0.5:1 to 1.25:1;
adding a reagent to the first stream, wherein the reagent is selected from hydroxylamine free base and a salt of hydroxylamine, said reagent reacting with cyclohexanone to form cyclohexanone oxime; and
separating the cyclohexanone oxime and the cyclohexanol.
2. The process of claim 1 , wherein the reagent is provided as an aqueous solution including hydroxylamine free base.
3. The process of claim 1 , wherein said adding step further comprises adding a stoichiometric amount of the reagent based on the amount of cyclohexanone in the first stream.
4. The process of claim 1 , wherein said adding step further comprises adding an amount of the reagent from 10% less than to 10% in excess of the stoichiometric amount based on the amount of cyclohexanone in the first stream.
5. The process of claim 1 , wherein said separating step further includes a separation method selected from the group consisting of flash distillation, thermal distillation, filtration, centrifugation, decantation, phase separation, and solvent extraction.
6. The process of claim 1 , wherein the reagent is a salt of hydroxylamine.
7. The process of claim 6 , where the salt of hydroxylamine is selected from the group consisting of hydroxylamine sulfate, hydroxylamine nitrate, hydroxylamine chloride, and hydroxylamine fluoride.
8. The process of claim 6 , wherein said adding step further comprises adding an aqueous solution comprising the salt of hydroxylamine to the first stream.
9. A process for separating an alcohol from a ketone/alcohol mixture comprising the steps of:
providing a first stream comprising cyclohexanone and cyclohexanol wherein the first stream has a ratio of the weight of cyclohexanone to the weight of cyclohexanol from 0.5:1 to 1.25:1;
adding an aqueous solution of a salt of hydroxyl amine and ammonia or ammonium hydroxide to the first stream to form a three-phase mixture comprising cyclohexanone oxime, cyclohexanol, and aqueous ammonium sulfate; and
separating the three-phase mixture to form a cyclohexanone oxime product stream, a cyclohexanol product stream, and an aqueous ammonium sulfate product stream.
10. The process of claim 9 , wherein said separating step further includes a separation method selected from the group consisting of phase separation, filtration and centrifugation.
11. The process of claim 10 , further comprising the step of separating the cyclohexanol and ammonium sulfate by at least one separation method selected from the group consisting of flash distillation, thermal distillation, centrifugation, and decantation.
12. The process of claim 9 , wherein said separating step comprises:
filtering the cyclohexanone from the three-phase mixture to form a two-phase mixture of cyclohexanol and aqueous ammonium sulfate; and
separating the two-phase mixture to form a cyclohexanol product stream and an aqueous ammonium sulfate product stream.
13. The process of claim 9 , wherein said separating step comprises:
separating the three-phase mixture into an aqueous ammonium sulfate product stream and a two-phase mixture of cyclohexanol and cyclohexanone oxime; and
separating the two-phase mixture to form a cyclohexanol product stream and a cyclohexanone oxime product stream.