How to operate a hydrogenation unit to control density and sulfur content? Including catalyst introduction

A hydrorefining unit primarily uses catalysts to carry out hydrogenation of hydrocarbon feedstocks under high temperature and pressure conditions, in order to reduce the sulfur content in the feedstocks and control the density of the products. 1. Controlling density: The density of the product is controlled by adjusting the reaction temperature, pressure, and flow rate of hydrogen gas in the hydrogenation reactor. The higher the temperature and pressure, the greater the degree of molecular fragmentation, thereby reducing the density of the product. 2. Controlling sulfur content: Increasing the amount of hydrogenation agent or raising the reaction temperature helps to convert sulfides completely into H2S, which is then separated out using a desulfurization system, thereby reducing the sulfur content. The catalysts are usually cobalt-molybdenum sulfides or nickel-molybdenum sulfides; their main function is to help break down the molecular chains of hydrocarbons and facilitate the reaction between sulfur and hydrogen to produce H2S. The catalyst needs to be replaced or regenerated regularly to maintain good activity and selectivity. .