(NAS Colloquium) Geology, Mineralogy, and Human Welfare (1999) / Chapter Skim
Currently Skimming:
Synthetic Zeolites and Other Microporous Oxide Molecular Sieves
Synthetic Zeolites and Other Microporous Oxide Molecular Sieves
Pages 3471-3478
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 3471... ...
Synthetic zeolites and other microporous oxide molecular sieves JOHN D SHERMAN Research and Development Department, UOP LLC, 25 East Algonquin Road, Des Plaines, IL 60017-5017 ABSTRACT Use of synthetic zeolites and other microporous oxides since 1950 has improved insulated windows, automobile air-conditioning, refrigerators, air brakes on trucks, laundry detergents, etc.
|
From page 3472... ...
The fluid catalytic cracking and hydrocracking units convert higher-molecular-weight hydrocarbons to lighter ones suitable for gasoline, light fuel oils, olefins, and other uses. In both fluid catalytic cracking and hydrocracking, zeolite catalysts provide vastly superior combinations of strong acid catalytic sites, uniformity of pore structure, and stability, all of which provide improved selectivity, yield, durability, and cost over nonzeolite alternatives.
|
From page 3473... ...
Both the TIP and IsoSiv processes originally were developed at Union Carbide's Molecular Sieve Department, now part of UOP. Petrochemicals Processing for Aromatics Production and Derivatives Ethylbenzene Synthesis.
|
From page 3474... ...
Oxygenates Removal Unit. Zeolite adsorbents are used in a UOP oxygenate removal unit down to >1 ppm total of trace oxygenates (e.g., DME, methanol, and methyl tertiary butyl ether)
|
From page 3475... ...
Because zeolites bind strongly to polar compounds, including hydrogen sulfide, mercaptans, organic chlorides, CO, and to mercury, they can purify many streams in petroleum refineries, petrochemical plants, natural gas production plants, and chemical plants. In refineries, zeolite adsorbents remove impurities detrimental to downstream processing, including catalyst poisons (e.g., oxygenates and sulfur)
|
From page 3476... ...
The compressed gas is dried and passed to a reservoir that in turn supplies air pressure to the brakes to prevent the unintended actuation of the brakes while the truck is moving. When the reservoir is full, a signal shuts off the compressor; the dryer is Repressurized, and a little dry air is bled back through the dryer to partially regenerate the bed of molecular sieve (S.
|
From page 3477... ...
Many smaller applications of zeolites in catalysis and adsorption, although important and beneficial to mankind, are not discussed here because of space limitations. Noteworthy are the growing uses of zeolites and other molecular sieves as adsorbents in separations of volatile organic compounds and other pollutants, in desiccant cooling and dehumidification, and as ion exchangers for pollution abatement and toxic waste management.
|
From page 3478... ...
They also contribute to the quality and performance of the ultimate products because of the greater purity and uniformity of the intermediates made by using zeolites. The many benefits achieved from the applications of zeolites and other molecular sieves are the fruits of the basic investments made decades ago, and into the present, In the research areas of mineralogy, geology, geochemistry, structure and properties of natural zeolites, exploratory materials synthesis, materials character~zation methods and their application, and exploratory research on structure, property, and functionalities.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.