Process for producing phenol
First Claim
1. A process for the dehydrogenation of cyclohexanone to produce phenol, the process comprising:
- (a) contacting cyclohexanone in a reaction zone under dehydrogenation conditions with a dehydrogenation catalyst comprising (i) a support comprising silica; and
(ii) a dehydrogenation component comprising at least one metal selected from Group 10 of the Periodic Table of Elements, wherein the dehydrogenation conditions include a temperature of about 250°
C. to about 500°
C., a pressure of about 100 to about 3550 kPa, a weight hourly space velocity of about 0.2 to 50 hr−
1, and a hydrogen to cyclohexanone molar ratio of about 2 to about 20;
(b) terminating contact of the dehydrogenation catalyst with the cyclohexanone;
then(c) supplying at least one interim gas to the reaction zone wherein the interim gas is selected from an inert gas or hydrogen gas and wherein the interim gas contacts the dehydrogenation catalyst at temperatures above about 300°
C.; and
then(d) recontacting the dehydrogenation catalyst with additional cyclohexanone.
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Abstract
In a process for the dehydrogenation of cyclohexanone to produce phenol, cyclohexanone is contacted in a reaction zone under dehydrogenation conditions with a dehydrogenation catalyst comprising (i) a support comprising silica; and (ii) a dehydrogenation component comprising at least one metal selected from Group 10 of Periodic Table of Elements. Contact of the dehydrogenation catalyst with the cyclohexanone is then terminated and the dehydrogenation catalyst is contacted with an inert gas and/or hydrogen at a temperature of at least 300° C. Contact of the dehydrogenation catalyst with additional cyclohexanone is subsequently reestablished.
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Citations
17 Claims
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1. A process for the dehydrogenation of cyclohexanone to produce phenol, the process comprising:
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(a) contacting cyclohexanone in a reaction zone under dehydrogenation conditions with a dehydrogenation catalyst comprising (i) a support comprising silica; and
(ii) a dehydrogenation component comprising at least one metal selected from Group 10 of the Periodic Table of Elements, wherein the dehydrogenation conditions include a temperature of about 250°
C. to about 500°
C., a pressure of about 100 to about 3550 kPa, a weight hourly space velocity of about 0.2 to 50 hr−
1, and a hydrogen to cyclohexanone molar ratio of about 2 to about 20;(b) terminating contact of the dehydrogenation catalyst with the cyclohexanone;
then(c) supplying at least one interim gas to the reaction zone wherein the interim gas is selected from an inert gas or hydrogen gas and wherein the interim gas contacts the dehydrogenation catalyst at temperatures above about 300°
C.; and
then(d) recontacting the dehydrogenation catalyst with additional cyclohexanone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A process for the dehydrogenation of cyclohexanone to produce phenol, the process comprising:
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(a) contacting cyclohexanone in a reaction zone under dehydrogenation conditions with a dehydrogenation catalyst comprising (i) a support comprising silica; and
(ii) a dehydrogenation component comprising at least one metal selected from Group 10 of the Periodic Table of Elements;(b) terminating contact of the dehydrogenation catalyst with additional cyclohexanone;
then(c) contacting the dehydrogenation catalyst with hydrogen gas at a temperature of at least 300°
C., a pressure of about 100 to about 3550 kPa, a weight hourly space velocity of about 0.2 to 50 hr−
1, and a hydrogen to cyclohexanone molar ratio of about 2 to about 20; and
then(d) recontacting the dehydrogenation catalyst with additional cyclohexanone.
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17. A process for the dehydrogenation of cyclohexanone to produce phenol, the process consisting of:
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(a) contacting cyclohexanone in a reaction zone under dehydrogenation conditions with a dehydrogenation catalyst comprising (i) a support comprising silica; and
(ii) a dehydrogenation component comprising at least one metal selected from Group 10 of the Periodic Table of Elements;(b) terminating contact of the dehydrogenation catalyst with additional cyclohexanone;
then(c) contacting the dehydrogenation catalyst with hydrogen gas at a temperature of at least 300°
C., a pressure of about 100 to about 3550 kPa, a weight hourly space velocity of about 0.2 to 50 hr−
1, and a hydrogen to cyclohexanone molar ratio of about 2 to about 20; and
then(d) recontacting the dehydrogenation catalyst with additional cyclohexanone.
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Specification