Self-Condensation of Cyclohexanone Catalyzed by Amberlyst-15. Study of Diffusional Resistances and Deactivation of the Catalyst

• Published in: Industrial & engineering chemistry research 1994-03, Vol.33 (3), p.592-599
• Main Authors: Aragon, Jose M, Vegas, Jesus M. R, Jodra, Luis G
• Format: Article
• Language: English
• Subjects: 02 PETROLEUM; 020400 - Petroleum- Processing; Applied sciences; CATALYSTS; Chemical industry and chemicals; CHEMICAL REACTION KINETICS; CHEMICAL REACTIONS; CYCLOHEXANONE; DEACTIVATION; DEHYDROCYCLIZATION; DIFFUSION; EQUATIONS; Exact sciences and technology; Industrial chemicals; KETONES; KINETIC EQUATIONS; KINETICS; ORGANIC COMPOUNDS; Organic industry; REACTION KINETICS
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie00027a016

The deactivation of a macroporous sulfonic resin in a condensation process with production of water is due to three simultaneous causes: inhibition by water, fouling/poisoning, and hydrolysis of sulfonic groups. The reaction was performed in a batch reactor. The diffusional resistances were negligible for stirrer speed > 100 rpm, and particle size < 0.09 mm. The inhibition by water was minimum with water concentration, C[sub w], in the range of 0.1-0.2 mol/l. For a greater C[sub w], the inhibition is expressed by the pseudoactivity a[sub w][equivalent to] k[sub 1]/k(1 + k[sub 2]C[sub w][sup 2]). The deactivation by fouling/poisoning follows third-order kinetics with respect to both the activity, a, and the concentration of byproducts, Cp, -da/dt=k[sub d]C[sub P][sup 3]a[sup 3]. The hydrolysis of sulfonic groups, measured by the loss of fractional acid capacity, y[sub n], follows second-order kinetics, -dy[sub n]/dt =k[sub H]y[sub n][sup 2].