The cross-flow catalyst reactor. An alternative for liquid phase hydrogenations

✍ Scribed by R. De Vos; V. Hatziantoniou; N.-H. Schöön

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 694 KB
• Volume: 37
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(82)80044-4

✦ Synopsis

Ah&net-Liquid phase hydrogenation of aqueous nitrobenzoic acid was performed in the presence of a palladium catalyst. The carrier of the catalyst was designed for cross-flow processing with the intlow of hydrogen in separate channels perpendicular to the inflow of the liquid phase. The catalyst consisted of a number of thin, porous plates, separated by corrugated planes. The two reactants thus penerrate the catalytical plates from dierent sides. The effectiveness factor was shown to be much higher than in corresponding hydmgenatione in a trickle-bed. The properties of the cross-flow hydrogenation were discussed in connection with a mathematical model for reaction and mass transport in pores and channels of the. cross-flow catalyst. KNTRODUCTION Trickle bed reactors have been used in liquid phase hydrogenations for a relatively long time in the chemical industry. The properties of this type of reactors are therefore well known. The low availability of the catalyst surface due to the rather large catalyst particles is known to result in a very low effectiveness factor. Also, the relatively thick liquid tilm surrounding the particles may give rise to a high resistance against the hydrogen transport across this tilm.