US 6,685,892 B1Granted

Process and apparatus for controlling reaction temperatures

AssigneeUop LLC

InventorsBipin V. Vora, Raymond A. Pogliano

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Abstract

A process and apparatus for contacting reactants with a particulate catalyst while indirectly contacting the reactants with a heat exchange medium performs heat exchange in a first reaction zone and moves catalyst, at least intermittently, through the second reaction zone while the process is operating. The first reaction zone is preferably a fixed bed reaction zone. The use of first reaction zone as a fixed bed reaction zone simplifies the process arrangement by not requiring means for catalyst movement in a reaction zone that performs simultaneous heat exchange. Long periods of operation are possible since the first reaction zone will typically experience a slow rate of catalyst deactivation and need infrequent regeneration. The first reaction zone may also be designed for catalyst movement, but independently controlled from the first reaction zone to facilitate the movement of catalyst therethrough.

Claims6

Dependent claims

A reactor arrangement for contacting reactants and indirectly heat exchanging the reactants with a heat transfer fluid and replacing catalyst particles on stream, the arrangement comprising:

a first heat exchange reactor vessel defining a feed inlet for the addition of a reactant thereto, defining an intermediate outlet for the withdrawal of an intermediate stream therefrom, containing a heat exchange surface that defines a plurality of reaction channels on one side of the heat exchange surface for containing a catalyst and that defines a plurality of heat exchange channels on an opposite side of the heat exchange surface for circulation of heat exchange fluid therein;
a second adiabatic reactor vessel defining an intermediate inlet for adding at least a portion of the intermediate stream thereto, defining a reacted outlet for withdrawing a reacted stream therefrom, containing a perforated surface for retaining catalyst particles in a contacting bed, providing a particle addition inlet for adding catalyst particles to the contacting bed and providing a particle withdrawal outlet for removing catalyst particles from the contacting bed;
and
a conduit for communicating the intermediate outlet with the intermediate inlet.

1 more element

Dependencies are inferred from the claim text.