IMPROVEMENT OF TECHNOLOGICAL PROCESS IN CATALYTIC REFORMING UNIT FOR OPTIMIZING TECHNOLOGICAL PARAMETERS

Increasing the efficiency of the plant for producing aromatic hydrocarbons by catalytic reforming requires the rational use of resources and equipment. Increasing the efficiency of the devices contributes to optimization of the plant as a whole. It is proposed to modernize the construction of the trays of distillation columns and replace the sorbent of the adsorption columns. The diameter of contact of a bubble tray has been calculated. It was supposed to increase efficiency of drying circulation gases both during start and operation of reforming catalyst and during catalyst regeneration. There are enumerated the parameters of the proposed drying method, such as using aluminum oxide, aluminum silicate, or carbonic substance as porous matrix, as well as sorbent regeneration in a gas flow at a certain temperature.

Removal of hydrogen sulfide from an anaerobic biogas using a bio-scrubber

A novel biological treatment process for removing hydrogen sulfide from anaerobic biogas using a bio-scrubber has been developed. The treatment process is composed of a gas/liquid contact tower and an aeration tank. The biogas from an anaerobic wastewater treatment process is introduced into a multiple-bubble-tray contact tower (bio-scrubber) and scrubbed with activated sludge liquor from an aeration tank. The sludge liquor containing sulfides is then returned to the aeration tank, where the sulfide is oxidized to sulfate by sulfur-oxidizing bacteria such as Thiobacillus. The contact tower is designed to be air tight in order to prevent air from mixing into the biogas used as a fuel. A simulation model was developed to calculate effluent gas concentrations from the contact tower, incorporating input parameters such as influent hydrogen sulfide concentrations, gas flow rates, and gas/liquid ratios. Using the simulation model, design criteria were calculated and a full-scale plant for treating biogas from a UASB process for potato processing wastewater was constructed. The data shows that the hydrogen sulfide in the biogas was effectively reduced from 2,000 ppm to less than 20 ppm.