Ammoxidation of 2,6-dichloro toluene-From first trials to pilot plant studies

作者：Martin A^*; Kalevaru V N; Smejkal Q

来源：Catalysis Today, 2010, 157(1-4): 275-279.

DOI：10.1016/j.cattod.2010.01.037

• Ammoxidation
• VPO catalyst
• Scale up
• Pilot plant experiments
• Reactor simulation
• VPO catalyst
• 2 6 Dichloro toluene
• 2 6 Dichloro benzonitrile
• Temperature profile

The scaling-up of the gas phase catalytic ammoxidation of 2 6-dichloro toluene (DCT) to 2 6-dichloro benzonitrile (DCBN) over a promoted vanadium phosphate (VPO) catalyst from first lab-scale experiments to pilot plant runs is reported First experiments in a row of conversions of isomeric dichloro toluenes using simple non-promoted VPO catalysts only show poor yield and selectivity In particular DCT ammoxidation is hindered due to bulky chlorine substituents probably preventing a sufficient interaction of the methyl group and lattice oxygen and/or N-containing surface species Improved synthesis of VPO catalyst with the addition of promoters and gamma-alumina or mania leads to significant increase in DCT conversion and DCBN yield A Cr containing vanadyl pyrophosphate catalyst admixed with Mania (anatase) showed conversion up to 97% with DCBN yields of ca 80% The same catalyst was also used for pilot plant runs usually in the form of 5 mm x 3 5 mm shaped tablets that were prepared from a larger batch of solid synthesis The scaling-up of the process using 100 ml of catalyst was investigated both by catalytic experiments and reactor simulations The results showed that the temperature control will be crucial in scaling-

• 出版日期2010-11-17