US2012058024A1PendingUtilityA1

System and process for production of benzoic acids and phthalic acids

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Assignee: HASSAN ABBASPriority: Jun 27, 2007Filed: Nov 16, 2011Published: Mar 8, 2012
Est. expiryJun 27, 2027(~0.9 yrs left)· nominal 20-yr term from priority
Inventors:Abbas HassanEbrahim BagherzadehRayford G. AnthonyGregory BorsingerAziz Hassan
B01F 27/2711B01F 33/811B01F 33/81C07C 51/265B01J 8/222B01J 19/1806
55
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Claims

Abstract

Systems disclosed herein may include at least one high shear mixing device configured to produce a dispersion of oxygen-containing gas bubbles in toluene liquid phase, wherein the dispersion has a mean bubble diameter of less than 5 microns; a pump configured to deliver a liquid stream comprising the toluene to the high shear mixing device; and a vessel configured to receive the dispersion from the high shear mixing device and configured to maintain a predetermined pressure and temperature.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A system for reaction of toluene, the system comprising;
 at least one high shear mixing device configured to produce a dispersion of oxygen-containing gas bubbles in toluene liquid phase, wherein the dispersion has a mean bubble diameter of less than 1 micron;   a pump configured to deliver a liquid stream comprising the toluene to the high shear mixing device; and   a vessel configured to receive the dispersion from the high shear mixing device and configured to maintain a predetermined pressure and temperature.   
     
     
         2 . The system of  claim 1 , wherein the high shear mixing device comprises a rotor/stator set having a rotor tip, the mixing device configured for operating at a flow rate of at least 300 L/h and tip speed of at least 22 m/sec. 
     
     
         3 . The system of  claim 1 , wherein the high shear mixing device is configured to provide a tip speed of at least 40 m/sec. 
     
     
         4 . The system of  claim 1 , wherein the high shear device comprises at least one toothed rotor and at least one toothed stator separated by a shear gap width in the range of about 0.025 mm to about 10 mm, and wherein the high shear mixing device is configured to provide an energy expenditure greater than 1000 W/m 3 . 
     
     
         5 . The system of  claim 1 , wherein the predetermined pressure is less than about 1013 kPa and the predetermined temperature is less than about 160° C., and wherein at least a portion of the toluene liquid phase is partially oxidized in the vessel to form benzoic acid or 2-, 3- or 4-methylbenzoic acid. 
     
     
         6 . The system of  claim 5 , wherein the mean bubble diameter is less than 400 nm. 
     
     
         7 . The system of  claim 1 , wherein the mean bubble diameter is less than 100 nm. 
     
     
         8 . The system of  claim 1 , wherein the high shear device comprises a rotor/stator set having a rotor tip, and wherein the dispersion is subjected to high shear mixing at a rotor tip speed of at least 22 m/sec. 
     
     
         9 . The system of  claim 8 , wherein the high shear device produces a local pressure of at least about 1034 MPa at the rotor tip. 
     
     
         10 . The system of  claim 9 , wherein the rotor/stator set comprises a gap width in the range of from about 0.025 mm to about 10 mm. 
     
     
         11 . A system for production of benzoic acid, the system comprising;
 at least one high shear mixing device configured to produce a dispersion of oxygen-containing gas bubbles in a toluene liquid phase or a xylene liquid phase, wherein the high shear device comprises a rotor and a stator, and wherein the dispersion has a mean bubble diameter of less than 5 microns;   a pump configured for delivering a liquid stream comprising the toluene or the xylene to the high shear mixing device; and   a vessel configured to receive the dispersion from the high shear mixing device and configured to maintain a predetermined pressure and a temperature than about 160° C.   
     
     
         12 . The system of  claim 11 , wherein the high shear mixing is configured to operate at a feed flow rate of at least 300 L/h and a tip speed of at least 22 m/sec. 
     
     
         13 . The system of  claim 12 , wherein the high shear mixing device is configured to provide a tip speed of at least 40 m/sec. 
     
     
         14 . The system of  claim 13 , wherein the high shear mixing device is configured to provide an energy expenditure greater than 1000 W/m 3 . 
     
     
         15 . The system of  claim 14 , wherein the mean bubble diameter is less than 400 nm. 
     
     
         16 . The system of  claim 15 , wherein the high shear device produces a local pressure of at least about 1034 MPa at the rotor tip. 
     
     
         17 . The system of  claim 11 , wherein the mean bubble diameter is less than 100 nm. 
     
     
         18 . The system of  claim 11 , wherein each of the rotor and the stator comprise a grooved surface, and wherein the rotor and the stator are separated by a shear gap width in the range of about 0.025 mm to about 10 mm. 
     
     
         19 . The system of  claim 18 , wherein a second high shear device is connected in series with the high shear device. 
     
     
         20 . The system of  claim 18 , wherein the dispersion comprises catalyst particles.

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