An Alternative Approach Gas-Phase Reaction Between Propene and HP Vapors

An Alternative Approach Gas-Phase Reaction Between Propene and HP Vapors 

A gas phase process involving H P is extremely challenging, since safe and stable evaporation of H P is required, and precautions have to be taken to minimize the risk of explosions of the gas mixture. These problems were solved using a microstruc-tured reactor. A catalyst activity greater than 80 molpo (kgcat-h) has been reported activity of this magnitude in a conventional reactor would cause hot spots and increased decomposition of HP. 

Microreaction technology allows for better temperature control, and a safer provision and handling of H P both within and outside the range of explosive mixtures with propene and PO. To minimize the decomposition of H P during the evaporation phase, a microstructured falling-film evaporator is used, placed below the mixing device and reaction zone. The reaction is carried out with an excess of propene, at temperatures below 160 °C and a pressure below 1.5 atm. Por a propene conversion of 5-20%, the selectivity for PO obtained is around 90%, but the selectivity with respect to HP is 25%. The catalyst is coated onto the reactor module, forming a layer several hundred micrometers thick. One problem encountered was the slow accumulation of deposits on the catalysts, which were derived from the formation of by-products. 

This technology is emblematic of the new intensification approach currently used in the chemical industry, which is aimed at developing a safer, more flexible and more economic production of bulk chemicals, with minimal energy expenditure. 

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