Exxonmobil Chemical Patents Inc.

Exxonmobil Research and Engineering Company

Venkatesan V Krishnan

Karl Gottlieb Strohmaier

Jose G Santiesteban

Sebastian Carmen Reyes

Gregory J DeMartin

John Henry Sinfelt

The present invention is a separation process for producing a methanol, ethanol and/or dimethyl ether stream from a first stream containing C+ hydrocarbons. The first stream comprises C+ hydrocarbons, methanol, ethanol and/or dimethyl ether. The process comprises the step of passing the first stream through an adsorbent bed having a crystalline microporous material that preferentially adsorbs methanol, ethanol and/or dimethyl ether over the C+ hydrocarbons.

Separation of methanol, ethanol and/or dimethyl ether from hydrocarbon mixtures

In a process for separating propylene from a mixture comprising propylene and propane, the mixture is passed through a bed of an adsorbent comprising a porous crystalline material having (i) a diffusion time constant for propylene of at least 0.1 sec , when measured at a temperature of 373&deg; K and a propylene partial pressure of 8 kPa, and (ii) a diffusion time constant for propane, when measured at a temperature of 373&deg; K and a propane partial pressure of 8 kPa, less than 0.02 of said diffusion time constant for propylene. The bed preferentially adsorbs propylene from the mixture. The adsorbed propylene is then desorbed from the bed either by lowering the pressure or raising the temperature of the bed.

Separation of propylene from hydrocarbon mixtures

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Mount Laurel, NJ, United States of America

Venkatesan V Krishnan