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Tube bundle and tube inserts for the Stratco contactor reactor

Optimise heat transfer distribution and increase heat transfer for improved performance. 3/4” tube bundle: the ¾” tube bundle was developed in response to a desire to increase Contactor™ capacity by increasing the amount of heat transfer surface area available for a given Contactor™ reactor volume. With up to 40% more surface area, the ¾” tube bundle design allows the Contactor™ to process as much as 12% more olefin feed at a fixed Contactor™ temperature. No additional olefin feed? Installing a ¾” tube bundle can also provide benefits such as reduced acid consumption and increased octane while reducing Contactor™ temperature up to 6° F (~3° C) at a fixed olefin feed rate.

Tube inserts: When two phase effluent enters the Contactor™ tube bundle channel head, the vapor separates and rises causing the upper tubes to operate hotter due to higher vapor content. The result is reduced heat transfer and higher corrosion rates in those tubes. Tube Insert technology eliminates vapor separation in the channel head by maintaining back pressure on the effluent, keeping it liquid until it flashes inside the Tube Inserts. With Tube Inserts all of the tubes see the same vapor/liquid mixture resulting in efficient heat transfer and more even corrosion rates across all of the tubes. Tube Inserts can reduce Contactor™ temperatures by 4° F (~2° C) at a fixed olefin feed rate. If additional olefin feed is available, the improved heat transfer will allow up to 7% additional olefin feed to be processed at a given Contactor™ temperature. DuPont has designed the Tube Inserts to provide optimized flow distribution and the resulting benefits in both 1” and ¾” tube bundles.

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