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Method and System for Pulsed Purification of Gases

IP.com Disclosure Number: IPCOM000031686D
Publication Date: 2004-Oct-05
Document File: 5 page(s) / 334K

Publishing Venue

The IP.com Prior Art Database

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METHOD AND SYSTEM FOR PULSED PURIFICATION OF GASES

BACKGROUND:

This invention is directed to the field of separation of liquid or air mixtures.

SUMMARY OF THE INVENTION:

This invention is a packed bed adsorption system and can separate mixtures of liquids or gases containing two or more components.  The mixture enters the packed bed as a pulse of pressurized fluid.  The pulse is generated by the opening and closing of a Cycling Valve located between the pressurized feed and the adsorption bed.  The pulsing of the feed allows the components to separate into bands in the bed.  These bands are also pushed through the bed during the pulsing.  Without the pulsing, the bands of concentrated components will not form.  There is a region between the bands where the components are not completely separated.  This mixture front is a result of incomplete separation of the components by the adsorbent and also axial dispersion caused by diffusion and pressure effects.  The bands may contract and expand as the pressure is cycled which may result in mixing along the band fronts.  A Stream Selector Valve is located at the exit of the adsorption bed.  The Stream Selector Valve will rotate between the various exit streams depending on which component band is eluting from the bed.

There are many parameters that might affect the performance of the pulsed purification system which include the following:  adsorbent material, temperature of the bed, bed length, pulsing time and selector valve timing.  The process would be suitable for components with moderately small differences in adsorptive properties.  Large differences may result in bands overlapping and overtaking each other; while very small differences may not provide enough separation.  However, proper selection of operating parameters might eliminate these problems.

BRIEF DESCRIPTION OF THE FIGURE:

Figure is a schematic of the system and method of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS:

As shown in the Figure, this invention is a packed bed adsorption system and can separate mixtures of liquids or gases containing two or more components.  The mixture enters the packed bed as a pulse of pressurized fluid.  The pulse is generated by the opening and closing of a Cycling Valve located between the pressurized feed and the adsorption bed.  The pulsing of the feed allows the components to separate into bands in the bed.  These bands are also pushed through the bed during the pulsing.  Without the pulsing, the bands of concentrated components will not form.  There is a region between the bands where the components are not completely separated.  This mixture front is a result of incomplete separation of the components by the adsorbent and also axial dispersion caused by diffusion and pressure effects.  The bands may contract and expand as the pressure is cycled which may result in mixing along the band fronts.  A Stream Selector Valve is located at the exit of the adsorption bed...