Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-III-18Figure 1 – Dependence of the DMDS residual quantity on the temperature in reactorEvery point at this diagram corresponds to the quantity of sulfur-bearing substance andtemperature which set off the effect of each other and lead to the total desorption of sulfurfrom the catalyst surface. If temperature in reactor is lower then it is needed for the fullcompensation of sulfiding, then there is a residual quantity of sulfur on the catalyst surface.An optimal consumption of DMDS at different temperatures is calculated with use of themathematical model of hydrogenation process.As a result of investigations for Ni-catalyst of hydrogenation which is used at LABproduction plant, it was revealed that in order to get an optimal quantity of sulfur on thecatalyst surface DMDS consumption should be kept at the present level (1,5 ppm) and thetemperature should be decreased from 180–190 °С to 140–150 °С. But this will causeunavoidable decrease in hydrogenation reaction rate. The second way is to keep presenttemperature conditions along with increase in DMDS consumption from 1,5 ppm tо 2–3 ppm.338