82results about "Hydrotreatment operations starting-up" patented technology

This invention relates to a start-up method for oxidation-state hydrocracking catalyst used in oil refinery process. The method comprises: loading the oxidation-state hydrocracking catalyst into a reactor, introducing nitrogen to replace air in the reactor and pipelines, pressurizing to meet the pressure requirement of hydrocracking, switching to hydrogen after nitrogen flow is stable, raising the temperature of the catalyst bed to meet the temperature requirement of catalyst reduction after hydrogen flow is stable, keeping the temperature, adjusting the temperature of the catalyst bed to meet the temperature requirement of hydrocracking, adjusting hydrogen flux to meet the flux requirement of hydrocracking, and introducing hydrocarbon reactants. The method does not need pre-sulfurization of the catalyst with additional sulfurization agent, thus can avoid the problems caused by pre-sulfurization, and partially reduced catalyst has higher hydrocracking activity.

The invention discloses a class II active center hydrogenation catalyst start-up vulcanization method, which comprises the following steps: (1) taking class II active center hydrogenation catalyst before vulcanization; (2) filling the class II active center hydrogenation catalyst before vulcanization into a reactor at normal temperature and pressure, introducing nitrogen to replace air in a reaction system, then replacing the nitrogen with hydrogen and carrying out gas seal; (3) continuing to adjust the temperature of a bed layer of the reactor, and introducing vulcanized oil to moisten the catalysts; (4) cycling the vulcanized oil in a closed mode in the reaction system, gradually injecting vulcanizers into the vulcanized oil, and raising the temperature continuously to complete vulcanization; and (5) adjusting the bed layer to the reaction temperature after vulcanization, and switching raw oil. The catalyst start-up vulcanization method disclosed by the invention is conductive to forming more class II hydrogenation active centers for the catalysts, and is conductive to improving the use performance of the catalysts.

The invention relates to a process for upgrading pyrolysis tar in the presence of a utility fluid. The utility fluid contains 1-ring and / or 2-ring aromatics and has a final boiling point ≦430° C. The invention also relates to the upgraded pyrolysis tar, and to the use of the upgraded pyrolysis tar, e.g., for fuel oil blending.

The invention discloses a startup sulfurization method for a trickle bed class-II active center hydrogenation catalyst, which comprises the following steps: (1) preparing a class-II active center hydrogenation catalyst; (2) filling the class-II active center hydrogenation catalyst into a trickle bed reactor at normal temperature and normal pressure, introducing nitrogen to replace the air in a reaction system, sealing the nitrogen tightly, replacing the nitrogen with hydrogen, and sealing the hydrogen tightly; (3) regulating the temperature of a catalyst bed layer, introducing sulfurized oil from the bottom of the reactor, and wetting the class-II active center hydrogenation catalyst; (4) after the reactor is fully filled with sulfurized oil, introducing the sulfurized oil and hydrogen from the top of the reactor, forming closed-loop circulation in the reaction system, adding a sulfurizing agent into sulfurized oil gradually, and continuing to rise the temperature to complete sulfurization; and (5) after sulfurization is accomplished, introducing raw material oil from the top of the reactor. In the sulfurization method disclosed by the invention, the process is simple, the operation is convenient and quick, and the sulfurization effect is more ideal than the conventional method. Therefore, the method is more favorable for improving the number of class-II active center and consequently improving the activity of the catalyst.

Compositions and methods for restoring catalytic activity by dissolving soft coke with a solvent, one method including detecting soft coke deposition on a catalyst composition; preparing an aromatic bottoms composition with a Hildebrand solubility parameter of at least about 20 SI to remove the soft coke from the catalyst composition; and washing the catalyst composition with the aromatic bottoms composition until at least a portion of the soft coke deposition is removed.

The invention relates to a utility fluid, such as a fluid containing aromatic and non- aromatic ringed molecules, useful as a diluent when hydroprocessing pyrolysis tar, such as steam cracker tar. The specified utility fluid comprises >= 10.0 wt% aromatic and non- aromatic ring compounds and each of the following: (a) >= 1.0 wt% of 1.0 ring class compounds; (b) >= 5.0 wt% of 1.5 ring class compounds; (c) >= 5.0 wt% of 2.0 ring class compounds; and (d) <= 0.1 wt% of 5.0 ring class compounds. The invention also relates to methods for producing such a utility fluid and to processes for hydroprocessing pyrolysis tar.

The invention is directed to methods of starting up reaction systems. The reaction systems are those that use catalysts that comprise molecular sieves, particularly metalloaluminophosphate molecular sieves, especially metalloaluminophosphate molecular sieves which are susceptible to loss of catalytic activity due to contact with water molecules. The methods provide appropriate mechanisms of heating and loading the activated molecular sieves to protect against loss of catalytic activity that can occur due to contact with water molecules.

The present invention relates to a process for converting feedstock comprising materials of biological origin into hydrocarbons, said process comprising the steps where a) feedstock comprising at least one material of biological origin is subjected to purification treatment to obtain purified feedstock, and b) the purified feedstock is subjected to hydroprocessing in the presence of at least one hydrodeoxygenation catalyst, at least one hydrodewaxing catalyst and at least one hydrodearomatization catalyst to obtain a hydroprocessing product.

This invention relates to a process for activating a hydroprocessing catalyst and the use of activated catalyst for hydroprocessing. More particularly, hydroprocessing catalysts are activated in the presence of carbon monoxide. The catalysts that have been activated by CO treatment have improved activity.

A process for starting up a hydrotreating process using a bulk metal catalyst. The process comprises the steps of providing a hydrocarbon feed stream containing less than 100 ppmw nitrogen containing species; and adding a nitrogen-containing compound to the hydrocarbon feed stream followed by contacting the resulting feed stream with the bulk metal catalyst in the presence of hydrogen and a sulfur-containing species.

The invention is directed to methods of starting up reaction systems. The reaction systems are those that use catalysts that comprise molecular sieves, particularly metalloaluminophosphate molecular sieves, especially metalloaluminophosphate molecular sieves which are susceptible to loss of catalytic activity due to contact with water molecules. The methods provide appropriate mechanisms of heating and loading the activated molecular sieves to protect against loss of catalytic activity that can occur due to contact with water molecules.