Air Products and Chemicals, Inc.

Dennis P Bernhard

Howard C Rowles

John Dollin Bassett

Kimberly Schroeder Grassi

Richard P Freeman

Ramanathan R Tarakad

Michael H Evans

Robert L Teichman

Light components are stripped from a multicomponent liquid feed mixture in a core type plate-fin heat exchanger by heating and partially vaporizing the mixture during downward flow in one of a plurality of multichannel flow passageways in the exchanger. The vapor thus formed flows upward and promotes vaporization of dissolved light components from the liquid to yield a liquid product substantially free of lighter components. The passageways are disposed in indirect heat exchange with one or more additional groups of passageways, and heat for partial vaporization of the downward-flowing liquid feed mixture is provided by indirect heat exchange with a condensing process stream. Alternatively, this heat is provided by a bottoms stream recovered from distillation of the stripped liquid product withdrawn from the core type plate-fin heat exchanger.

Light component stripping in plate-fin heat exchangers

A process for cooling, phase separating, rectifying and stripping a hydrocarbon containing feed gas stream to recover a heavy hydrocarbon product wherein a predominant amount of the refrigeration for the process is provided from a single loop vapor recompression refrigerator employing a mixed refrigerant.

Process for the recovery of C.sub.2 + or C.sub.3 + hydrocarbons

The present invention relates to a process for the recovery of ethylene from a feed gas containing ethane, methane and other light gases, e.g. cracked gas or refinery off-gases, wherein ethylene is condensed in two stages, preferably rectified, and fed to an integrated demethanizer column. Refrigeration for the process is provided by an integrated combination of work expansion of rejected light gases, by vaporization of separated ethane at low partial pressure but high total pressure, and by a mixed refrigerant system. The process results in the separation and purification of ethylene from the feed gas stream while significantly reducing the energy consumption to do so.

Process for the recovery and purification of ethylene

A process is described for separating C.sub.4 + hydrocarbons in high recovery and high purity from a feed gas comprising about 0-5% C.sub.5 and heavier hydrocarbons, 1-10% C.sub.4 hydrocarbons, 0-10% C.sub.3 hydrocarbons, 0-10% C.sub.2 hydrocarbons and the balance CH.sub.4 and light inerts. Efficient separation is effected by using a dephlegmator cycle employing only internal refrigeration.

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Allentown, PA, United States of America

Dennis P Bernhard