Abstract:
A catalytic material includes a microporous zeolite supported on a mesoporous inorganic oxide support. The microporous zeolite can include zeolite beta, zeolite Y or ZSM-5. The mesoporous inorganic oxide can be, e.g., silica or alumina, and can optionally include other metals. Methods for making and using the catalytic material are described herein.
Abstract:
A parallel flow reactor (20) for the selective catalytic reduction of nitrogen oxide in a gas stream includes a shell (21) enclosing an interior space in which is located a plurality of substantially parallel planar catalyst beds (23a-f), each containing a catalyst for the selective conversion of NOx. Deflectors (24a-e) in the spaces between the catalyst beds direct the flow of gas through the beds. An injector (22) upstream of the catalyst beds introduces a reducing agent such as ammonia into the inlet gas stream. The catalyst bed can include monolith or microengineered catalyst.
Abstract:
An olefin metathesis catalyst consists essentially of a transition metal or oxide thereof, preferably tungsten oxide, supported on a high purity silica support possessing less than 150 ppm Mg, less than 900 ppm Ca, less than 900 ppm Na, less than 200 ppm Al, and less than 40 ppm Fe. The support possesses low amounts of acidic or basic sites such that in the reaction of pure butene-1 over said catalyst under metathesis reaction conditions the reaction possesses a weight selectivity to hexene-3 of at least 55 wt%.
Abstract:
A pyrolysis heater has the inlet sections of the process coils grouped together and the outlet sections of these same process coils also grouped together. High heat liberation hearth burners are located adjacent to the inlet sections of the coils and lower heat liberation burners are located adjacent to the outlet sections. The secondary fuel tips of the burners are inclined toward the adjacent, heater wall. The high heat liberation hearth burners adjacent to the inlet coils are arranged in spaced apart pairs with the secondary burner tips of each of the pair being inclined toward the other burner of the pair.
Abstract:
A cryogenic process and apparatus for separating multi-component gaseous hydrocarbon streams to recover both gaseous and liquid compounds. More particularly, the cryogenic processes and apparatus of this invention utilize a high pressure absorber (14) to improve the energy efficiency of processing natural gas for pipeline gas s ales and recovering natural gas liquids (NGL) gas from gaseous hydrocarbon streams.
Abstract:
A refrigeration system for an ethylene plant uses a low pressure demethanizer (12) and a binary refrigerant (20) comprising a mixture of methane and ethylene or methane and ethane. The refrigeration composition may be constant throughout the system or separators (88, 108, 120, 128) may be used to divide the refrigerant into a methane-rich binary refrigerant (140) and an ethylene- or ethane-rich binary refrigerant (142).
Abstract:
Bimodal inorganic material that in a pore size distribution plot has distinct mesopore and micropore peaks. A process for producing a bimodal material or a material that contains essentially only mesopores involves heating an inorganic oxide in the presence of material that bonds to the inorganic oxide by hydrogen bonding. The micropores may or may not include a crystalline structure.
Abstract:
A residue from petroleum refining is thermally cracked to convert the residue to useful cracked products and to generate fuel gas. The residue is cracked by contact with hot synthesis gas produced by the gasification on the tar/pitch residue remaining after the cracking of the residue feed. Waste heat can be recovered from remaining portions of the synthesis gas from the gasifier in the form of steam which can be used in the gasification process and in the cracking process as needed for coke suppression. The combustible synthesis gas and the combustible gasses from the thermal cracking are separated from the cracked product liquid and used for power generation in a combined cycle plant.
Abstract:
A thin film of catalyst is applied to a substrate by use of a coating composition that includes a film-forming polymer to reduce cracking of the coating during the coating process, resulting in an attrition resistant thin film product. Polyvinyl pyrrolidon and hydropropyl methylcellulose are used as film forming polymers in the examples.
Abstract:
Upper and lower mirror image die plates (64, 82) are resiliently supported and have predetermined displacement values for forming vortex generators (48, 50) and foldline crease channels (75, 100) without compressive deformation in a porous sintered metal fiber sheet material (14). Cutters (44) and ridges (73, 98) coupled to the upper and lower die plates (64, 82) form the respective vortex generators and channels. The sheet of so formed material is then placed in an apparatus for bending the sheet at the foldline channels (75, 100) to corrugate the sheet without deformation of the sheet material between the corrugation bends. Fingers align with and engage the channels. The fingers are on plates (128; 130; 166; 168) that are ramped closer together simultaneously while the fingers on two mirror image coplanar sets of plates displace toward each other as the sheet material is folded. Pins on a pair of rotating levers engage each of the finger plates of the two sets for relatively horizontally displacing the plates and corresponding fingers as they are ramped together vertically.