OP-II-3

PP-II-44For the hepten, alpha-methylstyren and ether of paranitrobenzoic acidhydrogenation (anesthesin production) at the range of 20-80 °C and 1- 6 bars onPd/C (40 microns of particular diameter) by using special technique the hydrogendissolved concentrations during the reaction runs in suspension were measured. Inthe case when initial solution to be hydrogenated was by gas presaturated theconversion of the reaction is higher.A mathematical model proposed which accounting for of influence of initialcondition on the performance of the different types of gas-liquid reactors: thepreliminary saturation of a reaction solution before the reactor (continuous or beforethe reactor (batch) in comparison with “usual” mode of operation. Such kindapproach was successfully used for Loop - Ventury reactors investigations.At the Fischer - Tropsch synthesis inert liquid also can be presaturated by syngasbefore the reaction zone. Here we propose non isothermal, non stationary modelaccounting for different way of hydrogen and carbon oxide dissolution when thetemperature is change. Plug flow in gas phase, axial dispersion on liquid andtemperature along axis are considered. Solid phase distribution is describing bydiffusion model. Two initial conditions are accepted: liquid is saturated by gas andanother case – “usual” mode of operation. For models calculation liquid Pe numbervalues, mass transfer data and phases hold up have been taken for the case offluidized bed with packing.Many examples have been made by analyzing of model equations by differenttemperatures, catalyst loading gas and liquid flow rates. Accounting for gas solubilityincreasing both for hydrogen and carbon oxide with temperature increasing it seemsthat adiabatic regime will be favorable. According catalyst distribution along theheight of column at the bottom concentration of catalyst is elevated and syngasdissolved level is also high, then rate of the reaction and consequently heatgeneration is also considerable. At the top of the reactor catalyst concentration is lowand due to syngas consumption its (H 2 +CO) concentration is also small.Utilizing of packing and inert liquid medium by gas presaturation does thepossibility to decreasing the reactor length, high syngas conversion by one path.415