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

The invention discloses a method for precuring hydrogenation catalyst and a hydrogenation process operation method. During the presulfurization of the catalyst, intake of curing ingredient for partially precuring the catalyst is much more than theoretical sulfur demand of active hydrogenation metal in the catalyst. Precured hydrogenation catalyst and the hydrogenation catalyst which is not precured are mixed or layered in a reactor, and by operation and activation all catalyst is effectively cured. The method of the invention can precure the required catalyst, shorten the production period for precuring the catalyst, reduce the production cost and enhance economic benefit.

The invention discloses an operating method for a vulcanized hydrogenation catalyst. The method comprises the following steps: impregnating the vulcanized hydrogenation catalyst with an organic complex solution of a group-VIII metal; carrying out heat treatment so as to allow a layer of a protective film to form on the surface of the vulcanized hydrogenation catalyst; carrying out treatment in the presence of inert gas so as to allow the group-VIII metal to be inlaid in the defect of molybdenum disulfide or tungsten disulfide, thereby forming a high-activity hydrogenation active phase; and then carrying out switching into hydrogen, adjusting pressure and temperature to reaction pressure and reaction temperature after air current is steady, feeding raw oil and beginning a hydrogenation reaction. The method provided by the invention can passivate the vulcanized catalyst, facilitates transportation, storage and filling of the catalyst and can improve hydrogenation performance of the catalyst.

The invention discloses a start-up method for an ex-situ prevulcanization secondary activity center hydrogenation catalyst. After resistance to air loss of a device is qualified, circulating hydrogen compressor working load is adjusted to 0-20% of a maximum load, the catalyst reacts at a low temperature to release heat; when the bed layer temperature rise to 60-150 DEG C, start-up activation oil is introduced, the circulating hydrogen compressor working load is adjusted to 60-100% of the maximum load for wetting of the catalyst; the start-up activation oil is cycled in a reaction system closed path, the catalyst bed temperature is risen to 180 to 230 DEG C by heat exchange; a proper amount of olefin-enriched naphtha is added into the start-up activation oil, the catalyst bed temperature is risen to 300-380 DEG C to complete start-up activation. The start-up method, in the premise of no influence on the use properties of the secondary activity center hydrogenation catalyst, can better use the catalyst characteristics, reduce the device energy consumption, and reduce the device investment cost, and the start-up process can be simplified.

The invention discloses a start-up method for ex-situ prevulcanization secondary activity center hydrogenation catalysts, which comprises the following steps that: (1) the ex-situ prevulcanization secondary activity center hydrogenation catalysts are taken; (2) the ex-situ prevulcanization secondary activity center hydrogenation catalysts are filled into a reactor at normal temperature and normal pressure, nitrogen gas is introduced for replacing air in a reaction system, then, hydrogen gas is used for replacing the nitrogen gas, and the hydrogen tightness is carried out; (3) the temperature of a bed layer of the reactor is continuously regulated, start-up activation oil is introduced, and the catalysts are humidified; (4) the start-up activation oil carries out closed loop circulation in the reaction system, and the temperature is continuously raised for completing the start-up activation; and (5) after the activation completion, the bed layer is regulated to the reaction temperature, and raw material oil is switched. The catalyst start-up activation method is favorable for the catalysts to form more secondary hydrogenation active centers, and the use performance of the catalysts is favorably improved.

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 invention discloses a startup method of a sulfuration type hydrogenation catalyst. The method comprises the following steps: the sulfuration type hydrogenation catalyst is impregnated by using an organic complex solution of a VIII-group metal; a heat treatment is carried out, such that a protection film is formed on the surface of the sulfuration type hydrogenation catalyst; startup oil is introduced under the existence of an inert gas, and a treatment is carried out; the inert gas is switched into hydrogen, and the pressure and temperature are regulated to reaction pressure and reaction temperature when the gas flow is stable; raw oil is fed, and the hydrogenation reaction is started. With the method provided by the invention, the sulfuration type hydrogenation catalyst can be passivated, such that catalyst transportation, storage and loading are convenient. Also, the hydrogenation performance of the catalyst can be improved.

The invention relates to a starting method of a hydrocracking unit. A reaction zone of the hydrocracking unit is filled with an oxidation type hydrogenation catalyst. The starting method comprises steps of heating circulating gas to (150-225)+/-15 DEG C, introducing a sulfurizing agent, performing sulfuration at a constant temperature of 230+/-15 DEG C, heating continuously to raise the temperature to 370+/-20 DEG C and performing sulfurization at the constant temperature, introducing low-nitrogen starting oil when the temperature decreases to 150+/-15 DEG C after the catalyst sulfurization is finished, raising the temperature to 210+/-20 DEG C and introducing nitrogen-containing light distillate oil, introducing nitrogen-containing heavy distillate oil instead when the temperature is 290+/-15 DEG C or higher, introducing raw oil instead step by step when the temperature is 320+/-15 DEG C and shifting to normal production. Compared with the prior art, the starting method replaces anhydrous liquid ammonia by the nitrogen-containing distillate oil and the starting process is smooth and steady.

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 hydrotreating a first aromatics- and sulfur-containing hydrocarbon feed using a fresh supported CoMo catalyst, includes treating the fresh catalyst under first hydrotreating conditions with a second hydrocarbon feed having a lower aromatics content than the first feed.

The present invention discloses shut-down method of coal tar hydrotreating process. After the coal tar hydrotreating reaction is finished, the shut-down oil containing polar matter is first pumped into the reaction system for cleaning the pipeline and the reactor, and conventional shut-down oil is then added into the apparatus. Compared with available technology, the present invention has the advantages of complete cleaning of the reaction apparatus and capacity of ensuring the fluent shut-down.

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.

The invention discloses a suspension bed heavy oil hydrogenation process start-up method, which comprises the following steps: a reactor is firstly pre-heated by hot gas after a device is qualified in gas seal, after the reactor is pre-heated to 200-360 DEG C, raw oil containing a dispersive type catalyst and pre-heated to the same temperature and hydrogen are mixed and sent into a suspension bed reactor, the temperature of the reactor is further raised, and the material flow after reaction is fully cycled; and after the temperature of the reactor is raised to the reaction temperature, cycling operation is stopped, and device start-up is ended. In the method disclosed by the invention, light distillate and frequent switching operation used in the conventional heavy oil hydrogenation device are omitted, the start-up process is simplified, and the operation cost is reduced; and because the suspension bed hydrogenation start-up method is closely combined with the characteristics of suspension bed hydrogenation technology, the advantages of the technology are fully exerted, and the start-up method disclosed by the invention has wide adaptability.

The invention discloses an application method of a second-kind active site hydrogenation catalyst, comprising the following steps: (1) taking the second-kind active site hydrogenation catalyst and putting in a reaction at a normal temperature under a normal pressure, letting in the air in a nitrogen displacement reaction system; (2) when the temperature of the reactor being within normal temperature to 135 DEG C, introducing catalyst moistening oil; (3) after introducing the moistening oil, carrying out airtight inspection by heating and boosting according to a routine method; and (4) after qualifying the airtight inspection, carrying out catalyst activation, after the activation, adjusting to hydrogenation conditions, then introducing hydrogenation raw materials for hydrogenation reaction. The catalyst application method is beneficial for the catalyst to form more second-kind active sites and is beneficial for increasing the performance of the catalyst.

The invention discloses a hydrocracking process start-up vulcanization method. A hydrocracking process comprises a hydrocracking pre-refining reactor and a hydrocracking reactor, and oxidation state catalysts are used for each reactor; and the reactors are used for carrying out operations of gas replacement, catalyst drying, gas seal and the like. Under the condition of catalyst vulcanization, vulcanized oil and hydrogen enter a gas-liquid separator after entering the hydrocracking pre-refining reactor, liquid separated by the gas-liquid separator is cycled back to the hydrocracking pre-refining reactor and is cycled in a closed type in the hydrocracking pre-refining reactor, gas separated by the gas-liquid separator enters the hydrocracking reactor, and gas discharged from the hydrocracking reactor is cycled back to the hydrocracking pre-refining reactor. Compared with the prior art, the vulcanization method disclosed by the invention has a good catalyst vulcanization effect and a more prominent reaction effect.

The present invention relates to a wet start-up method for hydrogenation unit, an energy-saving hydrogenation process, and a hydrogenation apparatus. The method involves heating a start-up activating oil to a specific temperature and flowing the heated oil through a bed of hydrogenation catalyst bed, so that the temperature at the catalyst bed layer is increased to 180±10° C. or above by means of heat exchange and the reaction heat generated from activation in the start-up method.

The invention discloses an efficient start-up method of a hydrocracking catalyst. The start-up method comprises the following steps: introducing raw material oil in the vulcanization process, after vulcanization is completed, adjusting a reaction temperature, and when the mass yield of light oil less than 360 DEG C is stabilized at 45-50%, adjusting to a hydrocracking reaction condition to carry out a hydrocracking reaction, wherein the hydrocracking catalyst comprises 10-30% of a molecular sieve by weight, and the molecular sieve comprises, but not limited, a Y type or a USY (Ultra-Stable Y Zeolite) type molecular sieve. The method is simple in start-up and raw material switching process, stable in operation and capable of avoiding consumption of a passivant in the start-up process and potential danger in the ammonia injection process.

The present invention relates to a process for starting up a hydrotreating process using a bulk metal catalyst, said process comprising the steps of: i) providing a hydrocarbon feed stream containing less than 100 ppmw nitrogen-containing species; ii) adding a nitrogen-containing compound to said hydrocarbon feed stream; and iii) contacting the resultant feed stream with the bulk metal catalyst in the presence of hydrogen and a sulfur-containing species. The present invention also relates to a process for hydrotreating a hydrocarbon feedstock, said process comprising the steps of: i) providing a hydrocarbon feed stream containing less than 100 ppmw nitrogen-containing species; ii) adding a nitrogen-containing compound to said hydrocarbon feed stream; iii) contacting the resultant feed stream with a bulk metal catalyst in the presence of hydrogen and a sulfur-containing species; and iv) subsequently contacting the resultant bulk metal catalyst with the hydrocarbon feedstock in the presence of hydrogen.

The invention discloses a starting method of a hydrogenation catalyst, which comprises the following steps: (1) respectively mixing a hydrogenation catalyst carrier with a thiomolybdate and/or thiotungstate solution and a nickel salt and/or cobalt salt solution, and drying to obtain an intermediate-state hydrogenation catalyst; (2) uniformly mixing a vulcanizing agent with the intermediate-state hydrogenation catalyst obtained in the step (1), then carrying out heat treatment, cooling, and adding a phosphorus-containing substance; (3) drying the material obtained in the step (2) to obtain a presulfurized catalyst; and (4) loading the presulfurized catalyst in the step (3) into a reactor, and carrying out wet activation start-up. According to the method, the safety problem of hydrogen embrittlement of the reactor caused by too high initial activity temperature of the catalyst is solved, the ex-situ presulfurization process of the catalyst and a presulfurization catalyst start-up activation method are also improved, and the activity of the catalyst is improved while the initial activation temperature of the catalyst is increased.

The invention discloses a start-up method for a fluidized bed. The start-up method for the fluidized bed comprises the following steps of: bonding a micro-spherical fluidized bed catalyst into globular, hemispheric, columnar, flake or irregular catalyst particles by using a wax material, wherein the diameter of the catalyst particle is 2 to 20mm according to the equivalent volume sphericity; packing the catalyst particles in a reactor of the fluidized bed for carrying out the air tight operation; introducing starting-up oil below a melting point of the wax material in the catalyst particles and carrying out the cyclic operation; raising the temperature of the reactor of the fluidized bed to be higher than that the temperature of the melting point of the wax material in the catalyst particles by 5 to 100 DEG C; dissolving the wax material in the catalyst particles in the start-up oil; and activating the micro-spherical fluidized bed catalyst. According to the start-up method for the fluidized bed, the problem that the micro-spherical catalyst is broken due to the extrusion and collision and is polluted by dust in the process of placing the micro-spherical catalyst into the reactor is solved; the catalyst particles are prevented from being taken out from the reactor or causing stoppage in the start-up process of the device; and the start-up method has the advantages of short start-up time, high efficiency and good effect.