Abstract: In a process for the production of an oxygen-enriched air product, feed air is fed to the main heat exchangers at two pressures. The high pressure feed air from the main exchanger is partially condensed to vaporize the oxygen-enriched air product. This partially condensed feed air is separated with the vapor phase being warmed and expanded to supply refrigeration and subsequently being fed to the low pressure fractionation section, and the liquid phase being used to reflux both the high pressure and low pressure fractionation sections of a double distillation column. The low pressure feed air from the main heat exchangers is fed to the high pressure fractionation section. The high pressure fractionation section condenser is used to provide reboiler duty to the low pressure fractionation section.

Abstract: High purity hydrogen is produced at high recovery from liquid anhydrous ammonia. Ammonia is vaporized and subsequently dissociated into is constituents. The resulting dissociated gas stream is passed to an adiabatic metal hydride purification unit to absorb hydrogen present in the stream. The adsorbed hydrogen is then recovered as high purity product.

Abstract: In a process, utilizing high and low pressure distillation columns, for the separation of air to produce low purity oxygen and waste nitrogen streams, feed air from the cold end of the main heat exchangers is used to reboil a low pressure distillation column and to vaporize the low purity oxygen product. This heat duty for column reboil and product vaporization is supplied by splitting the air feed into at least three substreams. One of the substreams is totally condensed and used to provide reflux to both the low pressure and high pressure distillation column, preferably the substream which is fed to the oxygen vaporizer, while a second substream is partially condensed with the vapor portion of the partially condensed substream being fed to the bottom of the high pressure distillation column and the liquid portion providing reflux to the low pressure column. The third substream is expanded to recover refrigeration and then introduced to the low pressure column as column feed.

Abstract: A mild oxidizing acid wash of activated carbon in the presence of an oxidation catalyst produces an adsorbent, with a large carboxyl IR spectra peak, having a favorable water adsorption isotherm that can be used for both pressure swing adsorption, PSA, or thermal swing adsorption, TSA, drying of gases. The oxidation catalyst is a metal salt wherein the metal is selected from the group consisting of copper, chromium and nickel.

Abstract: In a process utilizing high and low pressure distillation columns for the production of an oxygen-enriched air product, feed air is fed to the main heat exchangers at two pressures. The high pressure feed air from the main exchanger used to supply refrigeration, by expanding a portion of the high pressure air prior to introducing that portion into an intermediate location in the low pressure column, and to vaporize the oxygen-enriched air product prior to using the stream as reflux for the high pressure column. The low pressure feed air from the main heat exchangers is partially condensed to supply reboiler duty to a low pressure column and is then fed to a high pressure column. The high pressure column condenser is used to reboil an intermediate liquid in the low pressure column.

Abstract: The invention relates to a process and apparatus for boiling flowing liquids such as liquefied gases in a heat exchanger in which a circulating flow is occurring, such as in reboiler-condensers in air separation and similar cryogenic plants or other applications where a high efficiency for boiling heat transfer is beneficial. The important feature of the process and apparatus is the use of two sequential heat transfer zones having different pressure drop and heat transfer characteristics in the same boiling channel, the first zone having an overall high-convective-heat-transfer characteristic and an overall higher pressure drop characteristic and comprising a plurality of sub-zones, each sub-zone sequentially having a lower pressure drop than the previous sub-zone and the second zone having a lower pressure drop and an enhanced nucleate boiling heat transfer characteristic.

Abstract: The present invention is a process for separating and recovering a component from a multi-component feed gas mixture. The feed gas mixture is initially separated in a membrane separation unit or units to produce a gas stream concentrated in the desired component. The concentrated gas stream is subsequently further separated in an adsorption unit having an adsorbent which selectively adsorbs non-desired gaseous components thereby producing a purified product stream. The non-desired gaseous components are subsequently desorbed and a purge stream from the adsorption unit containing the desorbed non-desired gaseous components along with a portion of the desired components is recycled to the feed gas mixture.

Abstract: The present invention is directed to a heat exchanger for reboiler or condenser service in a cryogenic distillation column (e.g. air separation) or other service in which small temperature differences between clean fluids are a primary objective. The exchanger comprises a stack of corrugated sheets having corrugations generally parallel to the diagonal between opposite corners of a sheet assembled with each sheet on an opposed diagonal to that of its neighbor, which provides for alternating condensing and boiling passages. These passages because of their configuration have increased primary heat transfer surfaces resulting in reduced temperature differences in the exchanger. Special edge configurations control boiling and condensing fluid flow patterns to maximize the heat transfer performance. Optionally, the heat exchanger can have an enhanced boiling surface applied to the boiling channel surface.

Abstract: The invention relates to an method of producing a titanium aluminide coating on a substrate by producing a flow of hydrogen and gaseous aluminum monochloride over a titanium surface to react to form a gaseous flow of titanium trichloride and aluminum monochloride and contacting the substrate with the flow of titanium trichloride and aluminum monochloride at a temperature of 800.degree. to 1200.degree. C., said substrate being a temperature below the temperature of the gases.

Abstract: A copolymer emulsion for bonding nonwoven products comprising an aqueous medium having colloidally dispersed therein a copolymer consisting essentially of vinyl acetate, 5-35 wt % ethylene and 2 to 10 wt % of an amide functional crosslinking comonomer which is N-methylolacrylamide or a compound of the formula R--NH--(CH.sub.2).sub.n --CH(OR').sub.2 where R is (meth)acryloyl, R' is a C.sub.1 -C.sub.4 alkyl group and n is 3 or 4, the copolymer emulsion prepared in the presence of 0.1 to 1 wt % polyvinyl pyrrolidone, based on vinyl acetate in the copolymer. Such emulsion binder copolymers demonstrate improved solvent resistance.

Abstract: A chemical vessel having improved access means comprising an access tube forming an openable conduit, being closed at the internal end with a discoid breakseal during shipment, a chemical removal tube slidably mounted in gas tight relationship inside the access tube, and means for moving the removal tube into engagement with and breaking out the breakseal for permitting removal of chemical from the vessel is disclosed.

Abstract: The present invention is a process for recovering hydrogen from a hydrogen-containing feed stream using a metal hydride adsorption cycle. The adsorption cycle utilizes at least six separate metal hydride adsorption beds, and has been expanded over conventional adsorption cycles to include several additional process steps. Each of the separate beds successively undergoes adsorption, first equalization, rinse or second equalization, desorption, repressurization with rinse effluent, repressurization with equalization effluent and final repressurization with feed gas.

Abstract: A process for converting heavy petroleum feedstocks to distillate products with reduced metals and asphaltene content by reaction with hydrogen in the presence of at least two metal catalysts, one a known hydrogenation catalyst and the other either zinc, iron or copper.

Abstract: This invention relates to an improved pressure sensitive adhesive comprising a polymer system which has excellent tack, peel and shear adhesion strengths. The improvement resides in the polymer, with the polymer system being formed by emulsion polymerizing an unsaturated ester, an unsaturated carboxylic acid and a polyfunctional monomer in the presence of a stabilizer system comprising an ethoxylated acetylenic tertiary glycol and polyvinyl alcohol.

Abstract: This invention relates to the use of tertiary butyl derivatives of toluenediamine and specifically 5-tert-butyl-2,4-toluenediamine as an antioxidant material for preventing oxidation of organic materials.

Abstract: In order to overcome the problems encountered in attempting to mix finely divided organic polymer materials into viscous polyol because of accompanying air entrainment, the polymer material is pretreated with a volatile liquid halocarbon or liquid hydrocarbon in an amount at least sufficient to wet the surfaces of the polymer particles. The halocarbon or hydrocarbon is one preferably otherwise employed as a blowing agent for the preparation of foamed resin polymers such as a polyurethane; particularly methylene chloride or a fluorocarbon (e.g. monofluorotrichloromethane). In accordance with an alternative embodiment the volatile treating liquid may be first mixed with the viscous polyol before addition of the ground material therein.

Abstract: A compound represented by the following formula: ##STR1## wherein R is a C.sub.3 -C.sub.24 olefinically unsaturated organic radical having functionality which renders the nitrogen atom electron deficient, the olefinic unsaturation functionality being polymerizable,R.sup.1 is hydrogen or a C.sub.1 -C.sub.4 alkyl radical, orR and R.sup.1 together with the nitrogen atom can form an olefinically unsaturated 5 to 7-member ring which has functionality that renders the nitrogen atom electron deficient and the olefinic unsaturation functionality is polymerizable,R.sup.2 and R.sup.3 are hydrogen, a C.sub.1 -C.sub.4 alkyl or acyl radical, orR.sup.2 and R.sup.3 together are a C.sub.2 -C.sub.4 alkylene group,R.sup.4 is hydrogen or a C.sub.1 -C.sub.4 alkyl, acyl, ester, amide or acid group, andn is an integer from 1 to 10, provided n is not 1 when R is (meth)acryloyl, R.sup.2 and R.sup.3 are methyl and R.sup.1 and R.sup.4 are hydrogen.Under acidic conditions the above compounds having R.sup.

Abstract: The gaseous effluent from oxidation of organic material with oxygen-rich gas, which effluent contains CO.sub.2 (and possible CO) and unreacted residual oxygen, is compressed and charged to a PSA system for selective removal of the CO.sub.x, the thus purified oxygen-rich product from the PSA system being recycled to the oxidation reaction. In the PSA system comprised of a plurality of adsorption columns operated in parallel, each column in turn undergoes the steps of: (1) selective adsorption of CO.sub.2 from the feed gas; (2) depressuring to near ambient level; (3) purging with air to remove sorbed CO.sub.2 ; and (4) repressuring with part of the recycled effluent from step (1).

Abstract: Enhanced oil recovery from a crude oil reservoir is promoted following primary oil production, by subjecting the reservoir to water flooding, discontinuing the water flooding, preferably when the remaining oil is at an OIP level above 0.10, and then subjecting the reservoir to fireflooding with gas having an O.sub.2 content of at least 50%, preferably above 85%.

Abstract: The method for extracting hydrogen from a gas stream containing hydrogen with or without other gases by a sorption-desorption process using as the hydrogen sorber a pellet bed of a porous, metallurgically bonded, heat-ballasted hydridable mixture comprising a major proportion of a heat-ballast material and a minor proportion of a hydridable metallic material.