48results about How to "Avoid rapid deactivation" patented technology

A method is provided for the thermo-neutral reforming of liquid hydrocarbon fuels which employs a Ni, Ce2O3, La2O3, Pt−ZrO2, Rh and Re catalyst having dual functionalities to achieve both combustion and steam reforming.

Production of high-cetane diesel oil from coal is carried out by filtering direct-liquefied diesel oil fraction of hydrogenated stabilized coal, mixing with hydrogen, contacting with hydrogenation refined catalyst and hydrogenation modified catalyst, separating out effluent from hydrogenation modified reactor to obtain naphtha fraction and diesel fraction, and returning hydrogen-enriched flow into diesel hydrogenation modified reactor. It is simple and fast, has better dearomatization and denitrification functions.

The preparation method for ethylbenzene selects high-pure ethene or refinery dry gas as material for alkylation reaction in catalytic distillation tower. Wherein, the tower comprises a reboiler, a stripping section, a reaction section with one or more condensers to take up some heat and condense part benzene vapour to improve ethene conversion, and a condenser on tower top.

The invention provides a petroleum resin hydrotreating method. The method comprises the following steps that (1) dissolved petroleum resin raw materials enter a first section hydrofining reactor where catalysts are loaded in a staged mode, a reaction is carried out under the conditions that the reaction pressure is 8-17.0 MPa, the reaction temperature is 230-270 DEG C, the air speed is 0.3-0.7 h<-1>, and the hydrogen / oil ratio is 300-800 v / v, the topmost portion of the first section hydrofining reactor is filled with a protecting agent, a main catalyst is a non-noble metal sulfide state supporting catalyst, and the bottom of the first section hydrofining reactor is filled with a sweetening catalyst; (2) after first section reaction products are washed with water and subjected to gas-liquid separation, liquid substances are sent into a stripping tower to be subjected to steam stripping, and hydrogen sulfide is further removed; (3) the liquid substances subjected to steam stripping enter a second section hydrogenation and dearomatization reactor and make contact with a supporting type Ni catalyst, and a reaction is carried out under the conditions that the reaction pressure is 4-10.0 MPa, the reaction temperature is 230-260 DEG C, the air speed is 0.5-0.7 h<-1>, and the hydrogen / oil ratio is 300-800 v / v; and (4) after reaction products obtained in the second section hydrogenation and dearomatization reactor are subjected to gas-liquid separation, solvent and petroleum resin products are separated, and the solvent is reused after being recycled. According to the method, the operation cost is low, and the yield of high-value products is high.