Mobil Oil Corporation

Melcon G Melconian

Tai-Sheng Chou

Nai Y Chen

Stephen S Wong

Rene B LaPierre

Clinton R Kennedy

Grant G Karsner

Richard J Quann

Nitrogenous compounds especially bases such as ammonia vapor are used to control the operation of a hydrocracker or catalytic dewaxer. Catalyst activity and selectivity may be controlled by addition of the base to the feed, for example, to control the balance between isomerization and hydrocracking in an operation using a zeolite beta catalyst. Runaway conditions may be controlled by the addition of nitrogenous compounds to regulate the temperature profile within the reactor.

Method for controlling hydrocracking and isomerization dewaxing operations

Method for controlling hydrocracking and isomerization dewaxing

Nitrogenous compounds especially bases such as amines are used to control the operation of a hydrocracker. Catalyst activity and selectivity may be controlled by addition of the base to the feed, for example, to control the balance between isomerization and conversion in an operation using a zeolite beta catalyst. Runaway conditions may be controlled by the addition of nitrogenous compounds and if they are added at intermediate points along the length of the reactor, the temperature profile within the reactor can be effectively regulated.

Method for controlling hydrocracking operations

The endothermic heat of reaction for zeolite-catalyzed paraffin aromatization is provided by a co-fed oxygenate stream. Advantageously, the addition of a dehydrogenation metal to the zeolite reduces the reaction temperature for paraffin aromatization to a range suitable for the exothermic conversion of an oxygenate to C.sub.5 + gasoline. Preferred paraffinic feedstreams include C.sub.3 -C.sub.4 LGP and the preferred oxygenate is methanol.

Heat balanced paraffin upgrading with co-fed oxygenate

A catalytic conversion process wherein a slowly deactivating catalyst contained in a multiplicity of fixed bed is operated in a serial fashion whereby the operating temperature of each catalyst bed is higher than the preceeding bed and the last catalyst bed in the series is removed from operation when a predetermined operating temperature is reached, the catalyst in the removed bed is reactivated or replaced and the reactivated or fresh bed is returned to service as the first bed in the series of fixed catalyst beds.

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Princeton, NJ, United States of America

Melcon G Melconian