50results about How to "Realize long cycle operation" patented technology

The invention provides a method for hydrotreating high-sulfur and high-metal residual oil, which comprises the following steps: the residual oil and catalytic cracking recycle oil are in contact with a residual oil hydrogenation catalyst in the presence of hydrogen gas and under the hydrotreating reaction condition so as to carry out a hydrotreating reaction; the reaction product is separated to obtain gas, hydrogenated naphtha, hydrogenated diesel oil and hydrogenated residual oil. The residual oil hydrogenation catalyst is a combination of at least two catalysts, namely, an up-flow reactor catalyst and a fixed-bed hydrogenation catalyst and the two catalysts are respectively put in an up-flow reactor and a fixed-bed reactor; the ratio of the up-flow reactor catalyst and the fixed-bed hydrogenation catalyst is 30:70 to 70:30. The method can treat the high-sulfur and high-metal residual oil and effectively slow down the ascending speed of the pressure drop of the fixed-bed catalyst bed, thus realizing the long-term running of the device. Besides, the method can combine the residual oil hydrotreating and catalytic cracking more effectively and has better implementation effect.

The invention relates to a low-quality heavy oil and residual oil hydrotreatment combined process. The low-quality heavy oil and residual oil hydrotreatment combined process is characterized in that firstly a heavy oil raw material is subjected to hydrogenation pretreatment by a slurry bed, after the gas-liquid separation is carried out, a liquid product is subjected to hydro-upgrading through a stationary bed, wherein a hydrogenation pretreatment part of the slurry bed comprises a slurry bed hydrogenation reactor and a slurry bed hydrogenation catalyst, reactors used for a hydro-upgrading part of the slurry bed mainly comprise two up-flow deferrization and decalcification reactors connected in parallel, one up-flow demetalization reactor, one fixed bed desulfurization reactor and one stationary bed denitrification reactor sequentially. The low-quality heavy oil and residual oil hydrotreatment combined process has the advantages of being capable of improving the hydrogenation impurity removal capacity of the catalyst, prolonging the life cycle of the catalyst, treating residual oil with high metal content, high sulfur, high nitrogen and high asphaltene and effectively slowing down the ascending velocity of pressure drop of the reactors, so that the long-period operation of the device is realized.

The invention relates to a hydrotreating combined process for inferior heavy oil and residual oil. The hydrotreating combined process comprises the following steps of: firstly pretreating the heavy oil and/or residual oil raw material in a slurry reactor; carrying out gas-liquid separation, and hydro-upgrading the liquid-phase product in a fixed bed, wherein the hydro-pretreating part of the slurry reactor comprises a straight cylinder type slurry reactor pretreatment reactor and a slurry reactor hydro-catalyst, and the reactors used in the fixed bed hydro-upgrading part sequentially and mainly include two parallel up-flow type deferrization-decalcification reactors, one up-flow type demetalization reactor, one fixed bed desulfurization reactor and one fixed bed denitrification reactor. By adopting the hydrotreating combined process provided by the invention, not only are the hydrotreating and impurity removal capacities of the catalyst improved, but also the running cycle of the device is prolonged. The hydrotreating combined process provided by the invention can be applied to treating the inferior heavy oil and residual oil, which are high in sulfur content, metal content, and asphalt content; the conversion ratio is 30-80%; the raising rate of the pressure drop of the reactors can be effectively reduced so as to achieve the long-period running of the device.

The invention discloses a method for hydrotreating coking distillate. In the method, after being mixed, raw material oil and hydrogen enter into a reactor from the bottom, a part of mechanical impurities, such as fine coke power, coke particles, iron sulfide, and the like, are separated after the raw oil and the hydrogen pass through a mechanical impurity sedimentation and deposition region, the material flow goes up to contact a hydrogenation catalyst bed layer for carrying out the hydrogenation reaction, and then the material flow is discharged from the top of the reactor. The method can be used as the pre-hydrogenation process of the coking distillate, also can be used as the main hydrogenation process of the coking distillate, or can be used in the pre-hydrogenation process and the main hydrogenation process at the same time. The method for hydrotreating coking distillate does not need to make great change to the traditional devices, and can realize long-period operation of the devices and enhance economic benefits with small investment.

The invention discloses a full liquid phase hydrogenation method of coal tar, which is characterized by comprising the following steps that coal tar raw materials respectively perform full liquid phase pre-hydrogenation reaction and full liquid phase main hydrogenation reaction, and main hydrogenation generated oil respectively generates naphtha products, diesel products and tail oil products through oil gas-liquid separation and distillation. The full liquid phase hydrogenation method enables the coal tar to perform the pre-hydrogenation reaction and the main hydrogenation reaction under the full liquid phase. The method can be suitable for hydrogenation modification of full fraction coal tar of any one or more of high-temperature coal tar, middle-temperature coal tar and low-temperature coal tar. During hydrogenation, coking can be effectively inhibited, reaction heat is controlled, energy loss is reduced, long-period running of a coal tar hydrogenation device is achieved, hydrogen consumption of the whole hydrogenation device can be reduced, investment of a compressor is reduced, and clean naphtha, diesel and tail oil products with sulfur nitrogen contents smaller than 400 parts per million (ppm) can be obtained.

The invention discloses a full fraction crude benzene hydrogenation method and a catalyst, belonging to the technical field of all fraction crude benzene processing. The method comprises steps of firstly allowing crude benzene fraction over 70DEG C and hydrogen to pass through a corpuscule generator and a static mixer sequentially, so as to mix the two raw materials into uniform corpuscule raw material with diameter of 0.1-20mu m; fully saturating the corpuscule raw material through hydrogenation through the catalytic action of the low temperature hydrogenation catalyst under the conditions of certain pressure, air speed and temperature, so as to convert the corpuscule raw material into stable saturated compound; mixing the oil generated through low temperature hydrogenation with fresh hydrogen, circulating hydrogen and less than 70DEG C crude benzene fraction from a pre-fraction tower, then hydrogenating again, gas stripping and fraction distilling the oil generated by hydrogenating full fraction crude benzene so as to obtain light arene fraction and heavy arene product, then predistilling, extracting and rectifying so as to obtain pure benzene, methylbenzene, xylene and non-arene products. According to the method, the problem of coking of full fraction crude benzene raw material in high temperature hydrogenation is solved, and the crude benzene hydrogenation device can run for long period.

The invention relates to a method and system to prepare asphalt with coal liquefaction residue. The system comprises a mixing extracting device, a first filter unit, a second filter unit, a drying device and a distilling device; the mixing extracting device is communicated with the first filter unit; the first filter unit is communicated with the drying device; the first filter unit is communicated with the second filter unit, and the second filter unit is communicated with the distilling device, wherein the first filter unit at least includes a first filter and a second filter; the second filter unit at least includes a third filter and a fourth filter. Each of the two filter units in the system includes two filters arranged in alternate manner, so that continuous production of asphalt isachieved.

The invention discloses a whole-fraction crude benzene hydrogenation method and a catalyst, and belongs to the technical field of whole-fraction crude benzene processing. According to the whole-fraction crude benzene hydrogenation method, firstly crude benzene fraction at the temperature being higher than or equal to 70 DEG C and hydrogen sequentially pass through a micro-particle generator and a static mixer, the two raw materials are mixed to form uniform micro particles with the diameter of 0.1-20 microns, and the micro-particle-state raw material is hydrogenated to be sufficiently saturated in the presence of a low-temperature hydrogenation catalyst and under the conditions of the certain pressure, air speed and temperature so that the raw material is converted into a stable saturated compound; low-temperature hydrogenated oil is mixed with new hydrogen, recycle hydrogen and crude benzene fraction coming from a pre-fractionating tower and having a temperature being lower than 70 DEG C, and then the mixture is hydrogenated; the hydrogenated whole-fraction crude benzene generated oil is subjected to gas stripping and fractional distillation to obtain light arene fraction and heavy arene products; and finally a separation flow comprising pre-distillation, extraction and rectification is carried out to obtain purified petroleum benzene, methylbenzene and non-arene products. By virtue of the whole-fraction crude benzene hydrogenation method and the catalyst, the problem of coking in a process of high-temperature hydrogenation of whole-fraction crude benzene raw materials is solved, and the long-term circulation of the crude benzene hydrogenation device is realized.

The invention provides a low-grade heavy-oil hydrotreatment process for maximally improving catalyst utilization rate. The process comprises more than two upflow desferri and decalcification reactors, an upflow demetallization reactor, a fixed-bed desulphurization reactor and a fixed-bed denitrification reactor. By using the simple and flexible hydrotreatment process, goals of both improving hydrogenation and impurity-removing capability of the catalyst and maximally increasing operating period of devices can be achieved. If hydrogenation catalysts are appropriately selected, effects can be relatively good. The process is especially suitable for processing residual oil with high sulfur, high metal content, and high asphaltene, and can realize long-period operation for the devices.

The invention provides an inferior heavy oil hydrotreatment process capable of improving catalyst utilization rate. In the inferior heavy oil hydrotreatment process, two parallelly connected upflow type deferrization and decalcification reactors, an upflow type demetalization reactor, a fixed bed desulfurization reactor and a fixed bed denitrification reactor are used. By adopting simple and flexible hydrotreatment steps and properly selecting effective catalysts, catalyst hydrogenation and impurity removal capability can be improved finally, and the purpose of prolonging running periods of devices to the greatest extent can be achieved. The inferior heavy oil hydrotreatment process is particularly applicable to treating residual oil high in sulfur, metal content and asphaltene and capable of realizing long-term running of the devices.

The invention provides a hydrogenation technological method for reducing the skimming of a catalyst, which is characterized in that: a standby gas-liquid distributor is arranged on a catalyst bed layer at the top of a hydrogenation reactor; the standby gas-liquid distributor consists of a long center pipe and a bubble cap; the upper end of the long center pipe is above the catalyst bed layer; the bubble cap is arranged at an upper part of the long center pipe, and a gap for materials to flow exists between the bubble cap and the long center pipe; the opening at the upper end of the long center pipe is closed by a pressure rupture film; the lower part of the long center pipe extends into the catalyst bed layer; and the rupture differential pressure of the pressure rupture films is lower than 0.45 MPa and higher than 0.1 MPa. According to the method provided by the invention, no big change is required to be carried out on the existing device, the long-term operation for the device can be realized with smaller investment, the catalyst of the whole bed layer is sufficiently utilized, and meanwhile, the pressure drop of the reactor is reduced, so that the production safety is ensured, and the economic benefit is increased.

The invention discloses an inferior heavy oil treatment method. The treatment method comprises the following steps: introducing inferior heavy oil into a first hydro-processing unit; carrying out a hydrogenation reaction in the presence of hydrogen and a first hydro-processing catalyst, directly introducing a liquid phase effluent obtained after the reaction into a catalytic cracking unit withoutfractionation, separating a reaction product to obtain catalytic slurry oil, mixing the catalytic slurry oil with a first auxiliary agent, carrying out settlement separation after the mixing treatment, obtaining a first material and residues after separation; introducing the first material into a second hydro-processing unit, carrying out a hydrogenation reaction under the action of a second hydro-processing catalyst and hydrogen, introducing a liquid-phase effluent obtained after the reaction into a clarification unit, obtaining clarified oil after separation, and subjecting the clarified oilto further solid-liquid separation to obtain purified oil slurry. According to the treatment method, heavy oil is cleaned, catalytic slurry oil generated by catalytic cracking can be purified, solidsand sulfur in catalytic slurry oil are removed, and the economic value of the catalytic slurry oil is greatly increased.

The invention relates to the technical field of chemical production, in particular to a crude benzene hydrofining process, which comprises the following steps: pretreating crude benzene, performing pressurizing by a pump, exchanging heat by a heat exchanger, and pumping the product into a hydrogen mixing tank; fully mixing a crude benzene full-fraction raw material, hydrogen and part of a recycledhydrogenation product in the hydrogen mixing tank, and fully dissolving the hydrogen in the raw material; sending a gas-liquid mixture discharged from the hydrogen mixing tank into a heating furnaceto be heated to 330-340DEG C, and then sending the product into an excessive hydrogen separation tank, and enabling the excessive hydrogen separated from the top of the excessive hydrogen separation tank to enter a tail gas treatment system; feeding the full-liquid-phase crude benzene raw material rich in dissolved hydrogen from the bottom of the excess hydrogen separation tank into a first-stagehydrogenation reactor, and carrying out a full-liquid-phase hydrogenation reaction under the catalytic action of a hydrogenation catalyst under the conditions of a pressure of 6-6.5MPa and a temperature of 340-345DEG C; flowing back one part of a hydrogenation product from the hydrogenation reactor to the hydrogen mixing tank, keeping the reflux quantity at 80% of the hydrogenation product, and subjecting the rest part to heat exchange with the raw material crude benzene, and then letting the rest part enter the gas-liquid separation tank. Therefore, the energy consumption is low, and the benefit is greatly improved.