Distillation system
a distillation system and distillation technology, applied in distillation, separation processes, chemical/physical/physico-chemical processes, etc., can solve the problems of large extruded pellets that do not lend themselves well to distillation structures, the porosity requirements of many catalytic materials limit their structural integrity, and the capacity limitation of the present packed tray of downcomer capacity
Inactive Publication Date: 2004-01-01
CHEM RES & LICENSING CO
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Benefits of technology
"The present invention is related to a system for carrying out distillation or chemical reactions while simultaneously separating the reactants and products by fractional distillation. The invention uses a packing material containing a particulate material and a resilient component positioned on trays to improve the efficiency of the distillation column. The packing material may contain a catalytic particulate material and the distillation may involve reaction and distillation of the reaction products. The use of the packing material results in higher efficiency of the column and reduced pressure drop through the column. The invention is useful for conventional distillation trays and modified versions thereof."
Problems solved by technology
Even larger extruded pellets do not lend themselves well as distillation structures.
While larger catalysts structures have been proposed, the porosity requirements of many catalytic materials limit their structural integrity.
The limitation on the non packed trays (as used in conventional distillation) is the liquid entrainment, whereas it appears that downcomer capacity is a limitation on the capacity for the present packed trays.
Hydraulic calculation indicates the throughput limitation that the downcomer backup is likely to impose on the packed trays.
Method used
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Embodiment Construction
[0025] The data for FIG. 1 was obtained using a column having 6 sieve trays spaced at 18 inches at 24 psia of the separation of a cyclohexane / n-heptane mixture under total reflux. The packing is formed by placing multiple link or continuous tube shaped structures on top of a wire mesh screen, such as demister wire. The tube comprises flexible, semi-rigid wire mesh tubular element filled with a particulate catalytic material the tube shaped structure having a fastener every 1-12 inches in length to form a multiple link looking like a chain of screen wire sausages. The packing is that described in U.S. Pat. No. 5,432,890 unrolled and packed in between each tray with demister wire between each layer of the tubing, providing alternating layers of demister wire and close placed tubes of catalyst. The entire space between the trays was packed in this manner, with at least the demister wire going to the tray above. The space over the downcomers was left open to allow liquid to disengage fr...
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Improved HETP is obtained in the operation of a distillation column containing trays with a packing of a porous container containing a particulate material intimately associated with a resilient component having at least 50 volume % open space, preferably at least 70 volume % positioned on the trays compared to the trays without the packing. The packing may contain a catalytic particulate material and the distillation may involve reaction and distillation of the reaction products. The particulate material may also be inert and the distillation of the conventional type to separate components in the distillation mixture without reaction.
Description
[0001] 1. Field of the Invention[0002] The present invention relates to a system for concurrently carrying out distillation or chemical reactions and separating the reactants and products by fractional distillation.[0003] 2. Related Art[0004] A method of carrying out catalytic reactions has been developed and widely commercialized, wherein the components of the reaction mixture are concurrently separable by fractional distillation. Several systems have been proposed and one commercially successful system uses the catalyst as the catalytic distillation structure. Such a system is variously described in U.S. Pat. Nos. 4,215,011; 4,232,177; 4,242,530; 4,250,052; 4,302,356; 4,307,254; 4,336,407; 4,439,350; 4,443,559; and 4,482,775 commonly assigned herewith.[0005] Briefly, the commercial catalytic structure described therein comprises a cloth belt with a plurality of pockets spaced along the belt and containing particulate catalyst material. The cloth belt with catalyst filled pockets i...
Claims
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IPC IPC(8): B01D3/00B01D3/16B01J19/32
CPCB01D3/009B01D3/16Y10S203/06B01J2219/32466B01J2219/326B01J19/32B01D3/22B01D3/32
Inventor SMITH, LAWRENCE A. JR.GILDERT, GARY R.FAIR, JAMES R.SEIBERT, A. FRANK
Owner CHEM RES & LICENSING CO