Two-phase downflow through catalyst beds: Part II. Pulsing regime pressure drop

✍ Scribed by E. Talmor

• Publisher: American Institute of Chemical Engineers
• Year: 1977
• Tongue: English
• Weight: 577 KB
• Volume: 23
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690230614

✦ Synopsis

Abstract

Surveys of local and overall pressure drop in partially pulsing 29.2 cm diameter beds show the overall pressure drop steady but elevated, while local pressure drops across various sections of the bed oscillate in correspondence with the local pulse frequency. The increase in overall pressure drop due to pulsing varies between 0 and 100%, depending on the extent of pulsing and liquid holdup within the bed.

In foaming systems, the overall bed pressure drop can be higher than for pulsing alone, depending on liquid holdup and (apparently) the type of foam and its intensity. In some cases, pulsing appears to be the starting point for low frequency foaming pressure drop surges which are associated with cyclic foam formation and breakup within the bed.