The present invention provides processes for filtering undesired chemicals in streams of contaminated air for supply to confined areas. The processes provide (1) contacting air with a filter comprising by volume from about 5% to about 95% impregnated zirconium hydroxide, from about 5% to about 95% activated impregnated carbon, and optionally, up to about 50% ammonia removal material; and (2) supplying the contacted air to a confined area.

A purifying device for purifying a process fluid that flows in a dehumidifying plant for dehumidifying plastics includes a first layer configured for filtering the process fluid, and a second layer configured for reducing, by adsorption, substances that are harmful for health, in particular COV/SOV, which are present in the process fluid.

The present invention provides for a pressure swing adsorption (PSA) process for the substantial removal of H.sub.2O and CO.sub.2 from a synthesis gas to obtain a multicomponent product gas substantially free of H.sub.2O and CO.sub.2 with high recovery of the product gas. Further, the present invention provides an integrated process that achieves sufficiently high H.sub.2 and CO recoveries such that compression and recycling of the syngas purification PSA tailgas is not necessary to be economically advantageous compared to the conventional processes.

A catalyst system comprising a combination of: 1) one or more catalyst compounds comprising at least one oxygen linkage, such as a phenoxide transition metal compound; 2) a support comprising an organosilica material, which may be a mesoporous organosilica material; and 3) an optional activator. Useful catalysts include biphenyl phenol catalysts (BPP). The organosilica material may be a polymer of at least one monomer of Formula [Z.sup.1OZ.sup.2SiCH.sub.2].sub.3 (I), where Z.sup.1 represents a hydrogen atom, a C.sub.1-C.sub.4 alkyl group, or a bond to a silicon atom of another monomer and Z.sup.2 represents a hydroxyl group, a C.sub.1-C.sub.4 alkoxy group, a C.sub.1-C.sub.6 alkyl group, or an oxygen atom bonded to a silicon atom of another monomer. This invention further relates to processes to polymerize olefins comprising contacting one or more olefins with the above catalyst system.

A system and method of pre-purification of a feed gas stream is provided that is particularly suitable for pre-purification of a feed air stream in cryogenic air separation unit. The disclosed pre-purification systems and methods are configured to remove substantially all of the hydrogen, carbon monoxide, water, and carbon dioxide impurities from a feed air stream and is particularly suitable for use in a high purity or ultra-high purity nitrogen plant. The pre-purification systems and methods preferably employ two or more separate layers of hopcalite catalyst with the successive layers of the hopcalite separated by a zeolite adsorbent layer that removes water and carbon dioxide produced in the hopcalite layers.

A catalytic converter includes a hydrocarbon catalyst trap including BEA zeolite configured to adsorb iso-octane at ambient temperatures and desorb iso-octane at temperatures between 150° C. and 170° C., and active metal supercage impregnated USY zeolite configured to adsorb and coke iso-octane at temperatures greater than 150° C.

Adsorbent materials are disclosed, along with filter elements containing the adsorbent materials methods of using adsorbents to remove siloxane contaminants from a gas stream. The method includes providing an adsorbent material that has been washed with an acid and passing a gas through the adsorbent material so as to reduce siloxane levels in the gas. A filter element for reducing siloxane levels in a gas includes a first adsorbent material, the first adsorbent material comprising an acid-washed adsorbent; and a second adsorbent material, the second adsorbent material comprising an acid-impregnated adsorbent.

Compositions that can be used to adsorb low concentration, of unwanted or target substances from a dynamic fluid stream or from an enclosed static vapor phase. Such adsorbency can be obtained with thermoplastic materials used in the form of bulk polymer or a film, fiber, web, woven fabric, non-woven fabric, sheet, packaging and other such structures including or surrounding the enclosed volume. The concentration should be reduced to non-offensive sensed limits or a limit that does not produce a biological response.

A system and method of pre-purification of a feed gas stream is provided that is particularly suitable for pre-purification of a feed air stream in cryogenic air separation unit. The disclosed pre-purification systems and methods are configured to remove substantially all of the hydrogen, carbon monoxide, water, and carbon dioxide impurities from a feed air stream and is particularly suitable for use in a high purity or ultra-high purity nitrogen plant. The pre-purification systems and methods preferably employ two or more separate layers of hopcalite catalyst with the successive layers of the hopcalite separated by a zeolite adsorbent layer that removes water and carbon dioxide produced in the hopcalite layers.

A pleated filter structure is provided for the removal of gaseous pollutants from a gas mixture to be filtered. The structure comprises an ideally air impervious filter sheet, being pleated so as to form an adjacent series of slit shaped conduits for the passage of air through the structure, each bounded on either side by the folded sections of the filter sheet, these being joined by a series of top creases and bottom creases. The top and/or bottom creases incorporate slit-shaped openings allowing passage of a gas mixture into and/or out of the structure. Gas to be filtered enters through one side of the structure, passes laterally across the filter sheet section surfaces and exits through the other side. Also provided are methods for the manufacture of a pleated filter structure, comprising forming rows of slit-shaped openings in a filter sheet and providing folds, in alternating directions, along the lengthwise extensions of adjacent rows of openings. Methods for filtering a gas are also provided.