OP-II-3

PP-I-18Hydrogenation kinetics was determined by measurements of hydrogenabsorption rate and chromatographic analysis of samples taken in course of theprocess. Three samples of the reaction mixture were taken in each experiment.The 1 st sample was taken when the maximal hydrogen absorption rate was attained.The 2 nd sample was taken when the absorption rate became two times lower. The 3 rdsample was taken when hydrogenation was finished.The data obtained from the analysis of dynamics of hydrogenation and the dataof chemical analysis of the samples taken in the three successive points in the kineticcurves of hydrogenation for each of the prepared catalyst samples are evidence ofthat all the catalytic materials are characterized high enough activity and selectivityeven at low temperatures and atmospheric pressure: sample 1 – phenylacetylene isfully removed in ~ 30 minutes at minor diminution of styrene; sample 2 –phenylacetylene is fully removed at catalytic contact of the fraction for 60-70 minutes;sample 3 – phenylacetylene is almost fully removed even in 15-20 minutes at highselectivity with respect to the styrene component.As a result of the experiments, model design of the reactor for purifying styrenefraction from acetylene impurities by selective hydrogenation has been developedand assembled. This model can be used when designing and producing suchreactors for industrial application. The proposed model reactor is equipped with ascrew- or turbine-type mixer located the axis of the reactor shell inside a cylindricalframe, a fiber glass catalyst stripe is reeled on the cylindrical frame, the mixer formsa flow circuit of reaction medium movement about a cylindrical catalytic cartridge toprovide intense contact of all the phases of reacting components: the styrene fractionand hydrogen with the catalyst. Reactor efficiency was tested on model reactions ofliquid hydrogenation.• The research work showed that purification of raw styrene fraction on proposedfiber glass catalytic materials is technologically promising process;• The catalyst samples provide high selectivity in full removal of phenylacetylenefrom the hydrogenated fractions without noticeable loss of styrene duringtechnological time of contacting (from 15 minutes to 1 hour) in the reactionmedium in mild conditions (25-30 °С, atmospheric pressure).• The experimental results are evidence of that potential of the proposed class ofcatalysts on glass woven base has not been exhausted so far. Optimizationsearch for such catalytic systems can be widened by varying structure andcomposition of a catalytic matrix that allows one to shorten times of contacting,i.e. reactor volume at given process selectivity.253