8results about How to "Solve easy coking" patented technology

The invention relates to the technical field of catalyst preparation, in particular to a deep hydrodenitrogenation and desulfurization catalyst and a preparation method thereof. According to the preparation method, a novel hydrodenitrogenation and desulfurization catalyst is obtained by redesigning raw materials of the catalyst and a preparation process of the catalyst. The raw material is a pseudo-boehmite product, and the active components comprise 18-25% of molybdenum oxide, 3.3-5.5% of nickel oxide and 1-3% of silicon oxide. The catalyst not only solves the problem of easy coking, but also prolongs the service life of the product to 2-3 years, can effectively reduce the use amount of the hydrodenitrogenation and desulfurization catalyst, reduces the use cost of the hydrodenitrogenation and desulfurization catalyst, and improves the hydrodenitrogenation and desulfurization effect of a reactor.

The invention relates to the technical field of crude oil cracking, and discloses a method and system for preparing low-carbon olefin and application, and the method comprises the following steps: (1) vaporizing raw oil to obtain a gas phase and a liquid phase; (2) carrying out supercritical extraction and sedimentation on the liquid phase to obtain extracted oil, settled oil and asphalt; (3) performing microwave cracking on the gas phase, the extract oil and water vapor in the presence of an electromagnetic wave absorber to obtain microwave cracking gas; (4) performing catalytic cracking on the settled oil to obtain catalyst cracking gas; and (5) separating the microwave cracking gas and / or the catalytic cracking gas to obtain the low-carbon olefin. According to the present invention, microwave cracking is adopted, and is matched with the supercritical extraction unit and the catalytic cracking unit, such that the problem of easy coking during the cracking reaction of the heavy cracking raw material can be effectively solved, the high low-carbon olefin yield can be obtained, and the operation period can be prolonged.

The invention relates to the technical field of low-carbon olefin preparation, and discloses a method and a system for preparing low-carbon olefin by cracking a petroleum raw material and application of the method and the system. According to the method provided by the invention, unrefined crude oil can be directly used as a raw material for preparing the low-carbon olefin, and the method has the characteristics of wide raw material source and low cost, and also has the advantages of high product yield, high production efficiency and the like, so that the method is very suitable for industrial popularization and application.

The invention relates to the technical field of crude oil cracking, and discloses a method and a system for preparing low-carbon olefin by utilizing microwave cracking and catalytic cracking and application, the method comprises the following steps: fractionating raw oil to obtain a gas phase fraction and a liquid phase fraction; under the condition of microwave cracking, mixing the gas-phase fraction with first water vapor, and then carrying out first contact with an electromagnetic wave absorber; carrying out second contact on the liquid-phase fraction and a catalyst under a catalytic cracking condition; and separating the first contact product and / or the second contact product to obtain the low-carbon olefin. According to the method, microwave cracking is adopted and is matched with fractionation and catalytic cracking, so that the problem that a heavy cracking raw material is easy to coke during cracking reaction can be effectively solved, the yield of low-carbon olefin is increased, and the operation period is prolonged.

The invention discloses a method for preparing saturated grease and byproduct alkane through two-stage low-pressure hydrogenation, and belongs to the technical field of hydrogenation. According to the method, the problem that the poor-quality raw material is easy to coke in the heating process is solved by directly mixing the hot-state circulating returned material and the cold-state fed material for temperature equalization, and lower operation pressure and temperature are adopted, so that the equipment investment is saved, and the operation cost is reduced.

The invention discloses a device and a method for preparing chemicals by directly cracking crude oil. One end of the reaction tube penetrates through the top wall of the spouted bed and extends into the spouted bed; the flow guide pipe is arranged in the spouted bed and is communicated with the air inlet, and the flow guide pipe corresponds to one end, extending into the spouted bed, of the reaction pipe; the first induction heating device and the second induction heating device are respectively arranged on the outer wall of the vertical part of the reaction tube and the outer wall of the spouted bed; the input end of the separator is communicated with one end, far away from the spouted bed, of the reaction tube; the first output end of the separator is communicated with the input end of the cooling and separating device, and the second output end of the separator is communicated with the fine coke particle storage area; the first output end of the cooling and separating device is communicated with the cracking product area, the second output end of the cooling and separating device is communicated with the gas inlet, and the third output end of the cooling and separating device is communicated with the nozzle. The continuous fluidized discharge of the second coarse coke particles generated by the crude oil is realized, the coking tendency in the reaction tube is reduced, and the cracking and operation efficiency is improved.

The application discloses a silver-based arsenic removal agent for an ethylene device and a preparation method thereof. The arsenic removal agent comprises the following components in the total mass of the arsenic removal agent being 100%: 0.3-0.8 wt% of an active component silver; 5.0-8.0 wt% of a bimetallic promoter (consisting of 3.0-5.0 wt% of indium oxide and 2.0-3.0 wt% of tin oxide); 1.2-2.0 wt% of a modifier (consisting of 0.8-1.2 wt% of cerium oxide and 0.4-0.8 wt% of a polydopamine carbon skeleton); and the balance of modified alumina; the arsenic removal agent has low cost, high activity and high safety; through carrier surface regulation and multi-component synergy, the arsenic removal agent realizes synchronous deep removal of arsenic, mercury and sulfur under ultra-low silver loading (<1%), effectively inhibits the generation of silver acetylide and carbon deposition, the agent does not need to add an additional mercury / sulfur removal bed, significantly reduces investment, and guarantees long-period stable operation of the ethylene device.

The invention relates to the technical field of crude oil cracking, and discloses a method and system for preparing low-carbon olefin from crude oil and application, and the method comprises the following steps: (1) pretreating the crude oil to obtain a light component and a heavy component; (2) in the presence of a wave-absorbing material, carrying out microwave cracking on the light component to obtain microwave cracking gas; (3) performing catalytic cracking on the heavy component to obtain catalytic cracking gas; and (4) separating the microwave cracking gas and / or the catalytic cracking gas to obtain the low-carbon olefin. According to the invention, the light component and the heavy component obtained by pretreating the crude oil are respectively subjected to microwave cracking and catalytic cracking, so that the cracking rate of the crude oil and the yield of low-carbon olefin are improved, the coking phenomenon during cracking is reduced, and the running time of the device is prolonged.