Air Products and Chemicals, Inc.

Vipul P Dholakia

Gamini Ananda Vedage

Michael Ian Cook

Frederick Herbert Walker

Annemarie Ott Weist

Robert Marjo Theodoor Rasing

Hao Ding

Timothy Christopher Golden

Anthony Rocco Cartolano

Athanasios Georgios Tsirukis

Richard Peter Boehme

Sunita S Sisodia

Neil Hannay

Anthony J Zehnder

William R Martine

David Lee Mitchell, Jr

David Lee Mitchell

Jr David Lee Mitchell

Embodiments of the present invention provide systems and methods for efficiently producing both a low-pressure ozone stream and high-pressure oxygen stream using a single air separation unit. The low-pressure ozone stream and high-pressure oxygen stream can be produced with significant energy savings and can be used in variety of applications, including the extraction of precious metals from ore with aqueous oxidation reactors and high-pressure oxidation reactors.

Integrated process for production of ozone and oxygen

The invention discloses systems and methods for producing a gas stream containing ozone and a 'carrier' or sweep gas that has an oxygen concentration that is below a predetermined percentage for treatment of organic waste feed stocks in an anaerobic digester. In one embodiment, ozone and unreacted oxygen from an ozone generator are delivered to a pressure swing adsorption cycle, wherein the ozone is adsorbed onto a sieve and the excess oxygen is removed from the cycle. The sweep gas, which has a limited oxygen concentration, is then used to desorb the ozone from the pressure swing adsorption cycle and deliver the ozone to an anaerobic digester, where the ozone is used to treat the feed stock.

Methods for using ozone to enhance anaerobic digestion

The invention discloses an apparatus and method to uniformly disperse ozone gas bubbles into liquid phase water for the treatment thereof. The apparatus consists of a water inlet section connected with a section with structured packing or monolith having parallel flow channels. A portion of the influent water is withdrawn from the main water stream as a side stream, pressurized by a pump, mixed with ozone-containing gas, and then injected back into the main water flow. The side stream may be divided into multiple streams either before or after mixing with the ozone-containing gas, and then injected into the main flow section upstream of the packed section. In alternate embodiments, the ozone-containing gas can be injected directly through the gas diffusers just upstream of the packed section in order to achieve uniform concentration of gas and liquid in the fluid entering the monolith.

Gas dispersion apparatus for improved gas-liquid mass transfer

A system and method for oxidation treatment of water in which ozone gas is dissolved in water by passing a mixed gas-liquid stream through a monolith at an elevated pressure that is close to the preferred gas output pressure for an ozone generator. The monolith is preferably contained at least partially within a gas-liquid separator vessel. Advanced oxidation is optionally provided by injecting hydrogen peroxide and/or embedding a catalyst on the monolith. At least a portion of the treated water is preferably recycled in order to increase total ozone dosing in the effluent stream.

Apparatus and method for dissolution of ozone in water and catalytic oxidation

The present invention provides N,N'-dimethyl secondary diamine polymers including methylamine-terminated poly-(N-methylazetidine) and methylamine-terminated poly-(N-methylazacycloheptane). Amine compositions and amine-epoxy compositions comprising N,N&#x2032;-dimethyl secondary diamine polymers are also disclosed.

N,N'-dimethyl secondary diamine polymer as epoxy resin curing agent

Epoxy resin amine curing agent of N,N'-dimethyl secondary diamine polymer

The present invention is directed to an improved reaction process that allows for the achievement of excellent NFproduction yields, while minimizing the amount of unreacted fluorine exiting with the process gases and minimizing the amount of liquid melt waste (HF/NH) produced by the process. The basic NFprocess resides in reacting Fwith an ammonium ion source, e.g., ammonium acid fluoride, under conditions for forming NF. The improvement in the process comprises:

Process for the production of nitrogen trifluoride

This invention relates to a process for the catalytic hydrogenation of impurity laden methylenedianiline feedstocks commonly referred to a MDA-50 and MDA-60. The process for hydrogenating methylenedianiline containing at least 40% oligomer function by weight comprises: contacting the feedstock with hydrogen in the presence of a rhodium/ruthenium containing catalyst system carried on a lithium aluminate support under conditions for effecting ring hydrogenation.

Hydrogenation of highly contaminated methylenedianiline

The invention is directed to an improvement in a catalytic process for the ring hydrogenation of a methylenedianiline feedstock, including crude methylenedianiline. One component of the improvement is a pretreatment process which resides in passing the crude methylenedianiline feedstock over a ruthenium catalyst carried on a fixed bed support, cooling without venting, and then hydrogenation of the pretreated crude methylenedianiline feedstock over a rhodium catalyst or a mixed Rh/Ru catalyst carried on a monolith support and carrying out the ring hydrogenation in a batch reaction. Another component in the improvement is the employment of a catalyst comprised of rhodium and ruthenium carried on a monolith support.

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Macungie, PA, United States of America

Vipul P Dholakia