Chemical reactor system and process
View Patent ↗A method for producing bisphenol includes introducing a phenol and a ketone into a fixed, supported catalytic bed reactor system in a downflow mode, reacting the phenol and the ketone to form a reaction mixture, and recovering the bisphenol isomer from the reaction mixture. The preferred bisphenol isomer is bisphenol A, or p,p′-bisphenol A, produced from the reaction of phenol and acetone. The reactor for producing the bisphenol A from the reaction of phenol and acetone includes an ion exchange resin catalyst disposed in a bed and packing randomly distributed throughout the ion exchange resin catalyst to improve heat transfer efficiency and reduce compression of the catalyst bed.
1. A downflow reactor for producing bisphenol A from the reaction of phenol and acetone introduced therein in a downflow mode, the reactor comprising:
a reactor vessel;
an ion exchange resin catalyst bed in said vessel, said catalyst optionally comprising a promoter, wherein the ion exchange resin catalyst bed comprises a first layer of ion exchange resin catalyst having a crosslinking density less than about 2 percent and a second layer of ion exchange resin catalyst having a cross linking density greater than about 2 percent, wherein the first layer forms an upper portion of the ion exchange resin catalyst bed and the second layer forms a lower portion of the ion exchange resin catalyst bed; and
packing randomly distributed throughout said ion exchange resin catalyst bed.
2. A system for the manufacture of bisphenol A from phenol and acetone, said system comprising:
an acetone feed stream;
a phenol feed stream mixed with said acetone feed stream to form a feed stream mixture;
a cooling apparatus to receive said feed stream mixture;
a reactor connected in fluid communication with said cooling apparatus, said reactor comprising:
a reactor vessel having an inlet at an upper end to receive said feed stream mixture, and an outlet at a lower end of said vessel;
a supported catalyst resin bed located intermediate said inlet and said outlet, said bed comprising an ion exchange catalyst resin and an inert packing material disposed randomly throughout said resin;
a temperature sensing means in communication with said vessel;
a pressure sensing means in communication with said vessel;
a bypass stream between said inlet and said outlet;
a second phenol feed stream capable of being received at said outlet;
a product takeoff line disposed in fluid communication with said lower end of said reactor, said product takeoff line being at the same elevation as said inlet to insure that the reactor operates in an overflow mode and to insure that the reactor remains completely liquid filled; and
a siphon break located downstream of said product takeoff valve.
3. The system of claim 2 , wherein said catalyst resin defines a substantially uniform void fraction over a vertical dimension of said bed between said inlet and said outlet.
4. The system of claim 3 , wherein said reactor is maintained at a temperature of about 55° C. to about 90° C. during the manufacture of said bisphenol A.
5. The reactor of claim 1 , wherein said packing comprises inert objects having a void volume of about 0.6 to about 0.98.
6. The reactor of claim 1 , wherein said packing is selected from the group consisting of Pall Rings, Beryl Saddles, Intalox Packing, Tellerette Packing, Hyperfill Packing, Stedman Packing, Sulzer Packing, Rasclug Rings and Koch-Glitsch Cascade Mini Rings® and mixtures thereof.
7. The reactor of claim 1 , wherein said ion exchange resin catalyst is a sulfonated aromatic resin.
8. The reactor of claim 1 , wherein said promoter when present is 3-mercaptopropionic acid.