38results about How to "High in paraffins" patented technology

The invention provides a method for producing diesel fuel by using coal direct liquefication oil and delayed coking heavy diesel fuel fraction and application of the method. The method comprises the following steps of: a) mixing coal direct liquefication hydrogenation stabilization oil and the delayed coking heavy diesel fuel fraction; and b) performing hydrogenation modification on mixed oil obtained in the step a). A diesel fuel product produced by the method has a low condensation point, low content of sulfur, nitrogen and aromatic hydrocarbon, a high cetane value and a high lubricating property, and the quality of the product meets the standard of national IV diesel fuel; in addition, the delayed coking heavy diesel fuel fraction with higher sulfur content is mixed with the coal direct liquefication oil, so that the ratio of the content of S to the content of N in crude oil can reach 1:1-5:1; and the sulfur is not required to be additionally added into the crude oil, so that operation cost is reduced.

The present invention relates to the field of diesel oil processing, and discloses a hydrocracking method for producing chemical industry raw materials from diesel oil distillates. The hydrocracking method comprises: introducing diesel oil distillates into a hydrocracking reaction zone containing a hydrocracking catalyst, carrying out a hydrocracking reaction, and separating the reaction productsobtained after the hydrocracking reaction to obtain light naphtha, heavy naphtha and a tail oil distillate, wherein the chain alkane content in the diesel oil distillates is 20-50 wt%. According to the present invention, with the hydrocracking method, the chemical industrial raw material can be produced from the diesel oil distillate under the medium-low pressure condition, wherein the heavy naphtha can be used as the high-aromatic-potential-content reforming raw material, and the light naphtha and the tail oil can be used as the high-quality steam cracking raw material.

The invention discloses a hydrocracking process for flexibly producing diesel oil. A wax oil raw material is subjected to hydrogenation pretreatment and then enters a hydrocracking reactor, and a hydrocracked material passing through a hydrocracking catalyst bed layer is divided into two streams; one stream of the hydrocracked material is subjected to gas-liquid separation and fractionation to obtain naphtha, aviation kerosene, diesel oil and tail oil; and the other stream of the hydrocracked material is mixed with a part or all of hydrocracking tail oil, and the mixture is fed into a hydrogenation isomerization cracking reactor and subjected to isomerization cracking; and a hydrogenation isomerization cracking product is subjected to gas-liquid separation and fractionation to obtain naphtha, aviation kerosene, diesel oil and tail oil. The invention provides the process for simultaneously producing more than two types of aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, especially diesel oil products with different condensation points, heat carried by a part of cracked materials can be fully utilized, and coupling operation of the hydrocracking reactor and the hydrogenation isomerization cracking reactor can be realized.

The invention discloses a flexible two-stage hydrocracking method. A wax oil raw material enters a separation system after hydrogenation pretreatment and mild hydrocracking; a separated liquid phase without impurities is divided into two parts; one part of the liquid phase enters a hydrocracking reactor using a reduction state hydrocracking catalyst; the other part of the liquid phase and hydrocracking tail oil are mixed and enter a hydroisomerization cracking reactor using a reduction state hydroisomerization cracking catalyst; an obtained hydrocracking reaction material and an obtained hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation respectively to obtain naphtha, aviation kerosene, diesel oil and tail oil products of different specifications. The invention provides the two-stage hydrocracking process for simultaneously producing more than two types of light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment for the first time.

The invention discloses a flexible hydrocracking process for producing lubricant base oil. A material obtained after a wax oil raw material is subjected to hydrogenation pretreatment is divided into two parts; a part of the material is separated by a hot high-pressure separator to obtain a liquid phase, and the liquid phase is mixed with hydrogen and then passes through a hydrocracking catalyst bed layer containing a Y-type molecular sieve; the other part of the material is mixed with a gas phase obtained by hot high-pressure separation and hydrocracking tail oil and then passes through a hydroisomerization cracking catalyst bed layer containing an isomerization cracking type molecular sieve; a hydrocracking reaction product and a hydroisomerization cracking reaction product are subjectedto gas-liquid separation and fractionation separately to obtain distillate oil and tail oil products with different specifications; and the hydrocracking tail oil is partially or completely circulatedinto the isomerization cracking reactor. The process provided by the invention can be used for simultaneously producing more than two kinds of naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, especially producing high-quality lubricant base oil.

The invention discloses a flexible hydrocracking method for producing lubricant base oil. The method includes dividing a wax oil raw material subjected to hydrogenation pretreatment into two parts; separating one part of the material by a hot high-pressure separator to obtain a gas phase and a liquid phase; mixing the other part of the material with the gas phase obtained by hot high-pressure separation and circulating hydrogen, and allowing the mixture to pass through a hydrocracking catalyst bed layer containing a Y-type molecular sieve; mixing the liquid phase obtained by hot high-pressureseparation with hydrocracking tail oil and circulating hydrogen, and allowing the mixture to pass through a hydroisomerization cracking catalyst bed layer containing an isomerization cracking type molecular sieve; respectively carrying out gas-liquid separation and fractionation on a hydrocracking reaction product and a hydroisomerization cracking reaction product to obtain distillate oil and tailoil products with different specifications; and partially or completely circulating the hydrocracking tail oil to an isomerization cracking reactor. The invention provides the flexible hydrocrackingmethod for simultaneously producing more than two kinds of naphtha, aviation kerosene, diesel oil and tail oil products with different specifications on a set of hydrogenation process equipment for the first time, especially high-quality lubricant base oil.

The invention discloses a hydrocracking process for flexibly producing diesel oil. A wax oil raw material is subjected to hydrogenation pretreatment and then enters a hydrocracking reactor; the obtained hydrocracked material is divided into two streams; one stream enters a hot high-pressure separator to be separated to obtain a gas phase and a liquid phase; one hydrocracked material stream which does not enter the high-pressure separator is mixed with the gas phase separated by the hot high-pressure separator, and the mixture is subjected to gas-liquid separation and fractionation to obtain hydrocracked naphtha, aviation kerosene, diesel oil and tail oil; the liquid phase obtained through separation by the hot high-pressure separator is mixed with a part or all of the hydrocracking tail oil and then mixed with hydrogen, the mixture is subjected to a hydroisomerization cracking reaction, and an obtained hydroisomerization cracking material is subjected to gas-liquid separation and fractionation to obtain hydroisomerization cracked naphtha, aviation kerosene, diesel oil and tail oil. The invention provides, for the first time, the hydrocracking process for simultaneously producing more than two aviation kerosene, diesel oil and tail oil products with different specifications on one set of hydrogenation process equipment, particularly diesel oil products with different condensation points.

The invention discloses a hydrocracking method. The method comprises the following steps: (1) high-nitrogen raw oil and hydrogen are mixed and enter a hydrogenation pretreatment reaction zone for reaction; (2) carrying out heat exchange on the reaction effluent in the step (1) or a liquid phase separated from the reaction flow in the step (1), and then, carrying out reaction in a hydrofining reaction zone; (3) effluent of the hydrofining reaction zone in the step (2) enters a hydrocracking reaction zone for hydrocracking reaction, the outlet temperature of the hydrofining reaction zone is T1, the inlet temperature of the hydrocracking reaction zone is T2, T1-T2 = T, and T is controlled to be greater than 5 DEG C; and (4) treating the reaction effluent in the step (3) through a separator to obtain different products. The method can be used for directly processing the full-fraction shale oil, and can run for a long period to produce high-quality diesel oil and gasoline by adopting a once-through process flow.

The invention discloses a flexible shale oil hydrocracking process. After the shale oil raw material is subjected to hydrocracking pretreatment, gas-liquid separation is carried out. The separated liquid phase first passes through the hydrocracking pretreatment reactor, and then continues to enter the hydrocracking reactor, and passes through the first hydrocracking catalyst bed. The material is divided into two streams; one stream of material is obtained through the gas-liquid separator in the middle of the bed to obtain the liquid phase, and then extracted from the hydrocracking reactor, which enters the hydroisomerization cracking reactor for isomerization cracking reaction; after the liquid phase is drawn out, the The material continues to flow downward through the second hydrocracking catalyst bed; the hydrocracking reaction material and the hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation respectively to obtain naphtha, aviation kerosene, diesel oil and tail oil products. The invention provides for the first time a hydrocracking process for simultaneous production of two or more different specifications of light naphtha, heavy naphtha, jet fuel, diesel oil and tail oil products on a set of hydrogenation process equipment.

The invention discloses a wax oil processing method which comprises the following steps: (1) separating a wax oil fraction to generate a wax oil fraction rich in saturated components and a wax oil fraction rich in unsaturated components; (2) the wax oil fraction rich in saturated components enters a hydrofining reaction zone A and a hydrocracking reaction zone B for a reaction, and products are separated to obtain a naphtha fraction, an aviation kerosene fraction, a diesel oil fraction and a high-viscosity index tail oil fraction; and (3) allowing the wax oil fraction rich in unsaturated components to enter a hydrofining reaction zone C and a hydrocracking reaction zone D for a reaction, and separating a product to obtain a naphtha fraction, an aviation fuel fraction and a diesel fraction optionally. The method can be used for producing high-added-value products such as high-viscosity-index lubricating oil basic raw materials and high-grade special oil products, and the utilization rate of the wax oil fraction and the added value of the products are improved.

The invention discloses a grading method of a hydrocracking catalyst. Raw oil and hydrogen enter a hydrofining reaction zone together, and a hydrofining reaction effluent directly enters a hydrocracking reactor without being separated and is sequentially subjected to contact reaction with more than two hydrocracking catalyst bed layers; wherein the mass fraction of NiO is reduced, the mass fraction of CoO is increased, the mass fraction of MoO3 is reduced, the mass fraction of total active metal oxide is reduced and the molecular sieve content is reduced in comparison with the downstream catalyst bed layer and the adjacent upstream catalyst bed layer along the material flow direction. According to the method disclosed by the invention, through reasonable grading of hydrocracking catalysts of different bed layers, the hydrocracking reaction temperature is reduced under the condition of the same conversion rate.

The invention discloses a flexible hydrocracking process. A wax oil raw material is subjected to hydrogenation pretreatment and then enters a hydrocracking reactor, and the material passing through anupper hydrocracking catalyst bed layer is divided into two streams; one material stream is extracted out of the hydrocracking reactor through the middle of the bed layer and enters a hydroisomerization cracking reactor for an isomerization cracking reaction; the other material stream flows downwards through a hydrocracking catalyst bed layer at the lower part; and an obtained hydrocracking reaction material and an obtained hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation separately to obtain naphtha, aviation kerosene, diesel oil and tailoil products with different specifications. The invention provides the hydrocracking process for simultaneously producing more than two different-specification light naphtha, heavy naphtha, aviation kerosene, diesel oil and tail oil products on one set of hydrogenation process equipment for the first time, heat carried by part of cracked materials can be fully utilized, and coupling operation of the hydrocracking reactor and the hydroisomerization cracking reactor can be realized.

The invention discloses a flexible two-stage hydrocracking process. A wax oil raw material is subjected to hydrogenation pretreatment and mild hydrocracking and then enters a separation system; the separated liquid phase is divided into two parts; one part of the liquid phase enters a hydrocracking reactor using a sulfided hydrocracking catalyst; the other part of the liquid phase is mixed with hydrocracking tail oil, and the mixture is fed into a hydroisomerization cracking reactor using a sulfurized hydroisomerization cracking catalyst; and an obtained hydrocracking reaction material and anobtained hydroisomerization cracking reaction material are subjected to gas-liquid separation and fractionation separately to obtain naphtha, aviation kerosene, diesel oil and tail oil products with different specifications. The invention provides the two-stage hydrocracking process for simultaneously producing more than two different-specification light naphtha, heavy naphtha, aviation kerosene,diesel oil and tail oil products on a set of hydrogenation process equipment for the first time.