Abstract:
Catalytic isomerization of paraffinic feedstocks containing at least about 1 ppm by weight sulfur is effected using an isomerization catalyst comprising a hydrogenation/dehydrogenation catalyst supported on molecular sieve without undue loss catalytic activity or selectivity by maintaining the water content of the feedstock below about 5 ppm by weight water.
Abstract:
High solids coating composition comprising (a) at least one film-forming organic polymer, (b) at least one volatile organic compound, (c) at least one cross-linking agent, and (d) at least one reactive diluent comprising a surfactant-like carbamate, urea, and/or amide derivative having an HLB value of from about 8 to about 14.
Abstract:
In air separation and other gas separations employing pressure swing adsorption technology, reduced cycle times are achieved by an advantageous combination of simultaneous processing steps. The gas released upon cocurrent depressurization from higher adsorption pressure is employed simultaneously for pressure equalization and provide purge purposes. Cocurrent depressurization is also carried out at an intermediate pressure level, while countercurrent depressurization is simultaneously carried out at the opposite end of the bed being depressurized to its lower desorption pressure level.
Abstract:
A process for reducing sheeting during production of polyolefins by polymerization of alpha-olefins utilizing titanium-based polymerization catalysts wherein the static electric charges in the reactor at the site of possible sheet formation are maintained below static voltage levels which would otherwise cause sheet formation.
Abstract:
Normal paraffins present in high concentrations in light naphtha streams are separated from non-normal paraffins in a four or more bed adsorption system employing, on a cyclic basis, the processing steps of (1) cocurrent purge/adsorption, (2) cocurrent feed/adsorption, (3) countercurrent purge and (4) countercurrent displacement. A processing sequence is employed wherein the cocurrent purge/adsorption and countercurrent purge steps are carried out on a discontinuous basis, while cocurrent feed/adsorption and countercurrent displacement steps are carried out in overlapping sequence. Control means are provided to assure that the high normal paraffin-containing hydrocarbon feed gas and stripping gas are passed to the appropriate beds for said cocurrent purge/adsorption and countercurrent purge steps on a non-continuous basis, said feed gas being continuously fed to a mix drum for mixture with countercurrent purge effluent before removal for use in said cocurrent purge/adsorption step and in said cocurrent feed/adsorption step of the overall four-step process.
Abstract:
Novel 1-(4-phenoxyphenyl)-3-benzoyl urea compounds are provided together with methods for their preparation and the use of said compounds as the active toxicant in pesticidal compositions.
Abstract:
A feed gas is passed to a pressure swing adsorption system, each bed of which undergoes a processing cycle that includes (1) pressurization (2) copurge at upper adsorption pressure, (3) countercurrent depressurization, including, in some embodiments, evacuation to a lower subatmospheric desorption pressure. By recycling effluent gas released upon copurge and countercurrent depressurization for use in the pressurization or the copurge step, the more readily adsorbable component of the feed gas is advantageously recovered at high purity and at high recovery levels. Enriched less readily adsorbable component is also recoverable as coproduct effluent at relatively high recovery levels. The process can be advantageously employed for the separation and recovery of product nitrogen from air.
Abstract:
The process for the production of light olefins from a feedstock comprising at least an aliphatic hetero compound comprising contacting said feedstock with a silicoaluminophosphate molecular sieve at effective process conditions to produce light olefins.
Abstract:
Dewaxing processes for hydrocarbon feedstocks using novel catalysts comprising specific silicoaluminophosphates. The products of the instant dewaxing processes are characterized by lower pour points than the hydrocarbon feedstock.
Abstract:
The heat capacity of activated carbon adsorbent pellets is enhanced by the mixing of activated carbon powder with a higher heat capacity, inert inorganic material, such as dense alumina, prior to pelletizing. The resulting doped adsorbent enhances the operation of adiabatic pressure swing adsorption processes by decreasing the cyclic temperature change in the adsorbent bed during each processing cycle of the process.