12results about How to "Reduce coking" patented technology

The invention discloses a vacuum flash tower based on vacuum deep distillation and a crude oil processing system and method, and belongs to the technical field of petroleum refining. According to the method, vacuum residue at the bottom of a vacuum tower is subjected to secondary flash evaporation by additionally arranging a vacuum flash evaporation tower, and light components (mainly wax oil) in the vacuum residue are further recovered. The vacuum flash tower adopts a combined design of an upper packed tower section and a lower plate tower section, the packed tower section is used for absorbing light components, and the plate tower section is used for prolonging the residence time of residual oil. And part of vacuum third-line wax oil extracted from the side line of the vacuum tower enters the top of the flash tower as an absorbent, absorbs flash light components and then is refined back to the vacuum tower, so that the product quality is ensured. The vacuum flash tower and the vacuum tower share a vacuum system, and the tower pressure is maintained at 4 kPa. According to the method, the vacuum residue extraction rate is remarkably increased, vacuum equipment does not need to be additionally arranged, the problem that light-component metal and residual carbon exceed the standard in a traditional process is solved, and economic benefits are remarkable. The method is suitable for heavy crude oil processing and has the advantages of low equipment investment, simple operation and the like.

The invention discloses a chlorine-containing pyrolysis oil radial moving bed reaction adsorption dechlorination hydro-conversion method, and belongs to the technical field of chlorine-containing oil product hydrotreatment and refining. According to the method, chlorine-containing pyrolytic oil is sequentially subjected to fixed bed selective hydrogenation, radial moving bed reaction adsorption dechlorination and fixed bed deep hydrofining reactor treatment; the radial moving bed is filled with a core-shell structure reaction and adsorption integrated catalyst, the core is a hydrodechlorination active component, the shell mainly adopts zinc oxide to adsorb HCl and is fixed in situ, and meanwhile, online addition and discharge of the catalyst are realized through the radial moving bed. According to the invention, poisoning of chlorine to the catalyst is effectively inhibited, the corrosion risk of equipment is reduced, shutdown of the device is avoided, the dechlorination efficiency is improved, the continuous operation period is prolonged, efficient, stable and economical hydro-conversion of the chlorine-containing pyrolytic oil is realized, and the obtained product can be used as clean fuel oil or a chemical raw material.

This invention relates to a biomass gasification system and method with dust removal function, including a gasifier, a burner, a raw material supply module, and a dust collection device. The raw material supply module is used to transport pulverized green waste or other biomass raw materials to the gasifier for gasification to generate biomass fuel gas. The inlet of the dust collection device is located near the outlet of the raw material supply module, and is used to extract dust entrained during the process of the raw material falling into the gasifier. The dust includes sawdust, glue fragments, and other lightweight combustible particles. The outlet of the dust collection device is connected to the oxygen supply path of the burner, and is used to introduce the dust into the burner to mix and burn with the biomass fuel gas. This invention, by constructing a closed-loop path of "dust extraction-reburning," can significantly reduce coking in the gasifier, improve gasification efficiency and burner temperature rise rate, achieve efficient recovery and utilization of dust energy, and enhance the overall operational stability and thermal output efficiency of the system.

The application discloses a product separation method of phenylenediamine prepared by a phenol hydroxylation method, which comprises the following steps: (1) sending the phenol hydroxylation reaction liquid into a vacuum dehydration tower for dehydration; (2) sending the mixture in the tower kettle of the vacuum dehydration tower into a thin film scraped blade evaporator for coke removal; (3) sending the gas phase mixture collected from the top of the thin film scraped blade evaporator into a phenol removal tower, and separating phenol; (4) sending the mixture in the tower kettle of the phenol removal tower into an o-phenylenediamine rectification tower for product refining, and separating o-phenylenediamine; (5) washing, filtering and removing coke from the p-phenylenediamine crude product solution in the tower kettle of the o-phenylenediamine rectification tower; and (6) decolorizing and crystallizing the p-phenylenediamine solution after the coke removal, and obtaining p-phenylenediamine. By means of the above-mentioned synergistic effect, the phenol hydroxylation reaction liquid is efficiently and high-quality separated.

The utility model discloses a distillation and purification device for triethyl orthoformate. Comprising a bottom plate, a bearing block fixedly connected to the upper end of the bottom plate, a distillation still fixedly connected to the upper end of the bearing block, a groove body formed in the peripheral wall of the distillation still in a penetrating mode, a sliding door hinged to the inner wall of the groove body, a feeding assembly arranged on the peripheral wall of the distillation still, a steam output assembly arranged at the upper end of the distillation still and a discharging assembly arranged at the lower end of the distillation still. The first bearing ring is fixedly connected to the middle part of the inner wall of the distillation kettle; the movable ring is placed at the upper end of the first bearing ring; the fixed cylinder is arranged on the inner wall of the movable ring in a sliding manner; the separation cylinder is fixedly connected to the lower end of the movable ring; the guide cylinder is fixedly connected to the upper end of the fixed cylinder; the air guide assembly is arranged at the upper part of the inner wall of the distillation kettle. The utility model has the advantages that the internal airflow can be actively guided and adjusted, the mass and heat transfer efficiency is high, and the cleaning and maintenance are convenient.

This invention discloses a method for preparing high-quality tire oil through catalytic pyrolysis of waste tires. The method uses a eutectic solvent formed by choline chloride and ferric chloride hexahydrate as a low-temperature phase change medium, which functions as a heat carrier, swelling agent, catalyst, and sulfur capture agent. Waste tire rubber powder is mixed with this medium, and a low-temperature swelling and pyrolysis desulfurization reaction is carried out under an inert atmosphere. The Lewis acidity of iron ions in the medium preferentially breaks the C-S and S-S bonds in the rubber crosslinking bonds. The sulfur-containing active species generated by the breakage are captured in situ as inorganic sulfides and retained in the liquid phase. The escaped oil vapor is condensed to directly obtain ultra-low sulfur, light-colored, transparent, high-quality tire oil. The used medium can be oxidized and regenerated by introducing air under heating conditions, and the sulfur is recovered in the form of elemental sulfur, allowing the medium to be recycled. This invention achieves synergistic unity of low-temperature pyrolysis and deep desulfurization at the source, with a simple process flow that is economical and environmentally friendly.

The invention relates to a method and system for producing ethylene and propylene from heavy oil, and the method comprises the following steps: introducing heavy hydrocarbon oil into a supercritical extraction separation unit for supercritical extraction separation to respectively obtain light deasphalted oil, heavy deasphalted oil and deoiled asphalt; carrying out hydrotreating on the deoiled asphalt to obtain hydrogenated deoiled asphalt; introducing the heavy deasphalted oil and the hydrogenated deoiled asphalt into a first reactor to be in contact with a first catalytic conversion catalyst for a first catalytic conversion reaction; introducing the light deasphalted oil into a second reactor to contact with a second catalytic conversion catalyst for a second catalytic conversion reaction; wherein the first catalytic conversion catalyst and the second catalytic conversion catalyst contain MPZ hierarchical pore molecular sieves. According to the method disclosed by the invention, polycyclic aromatic hydrocarbon which is not easy to react can be saturated, the cracking property of the deoiled asphalt is improved, the generation of coke is reduced, and the yields of ethylene and propylene are improved.

A method for producing mesophase bitumen, the method comprising: providing a raw material having a T5 ≥ 400°F (204°C) and a T95 ≤ 1,400°F (760°C); heating the raw material at a temperature of at least 450°C to produce a heat-treated product comprising mesophase bitumen, wherein the heating is carried out under reaction conditions sufficient to have an equivalent reaction time of greater than or equal to 1,000 seconds; and recovering the mesophase bitumen.

This invention discloses an integrated oiling system and production equipment for functional polyester industrial yarn, which relates to the textile field. It aims to solve the problem that in the prior art, the oiling agents are all single-component oiling agents, and the resulting polyester industrial yarn needs to be placed in a high-temperature drying room for drying at 50-90°C for 2-5 days, and then still needs to be left to stand for several weeks before it can be used. The key point of the technical solution is that the yarn first has the first component oiling agent applied through the first oiling nozzle, and after being homogenized by the pre-networker, the second component oiling agent is applied through the second oiling nozzle. Finally, it is treated at high temperature by the relaxation roller, so that the catalytic cross-linking reaction of epoxy resin is completed directly before winding, and it can be used directly without the need for additional drying room or long-term room temperature curing.

The invention discloses a modified molecular sieve, a carbon nanotube and a preparation method and application thereof. The preparation method of the modified molecular sieve comprises the following steps: heating a hydrogen-type molecular sieve in an NH4HF2 solution or hydrofluoric acid, then heating the hydrogen-type molecular sieve in a NaAlO2 solution, and then calcining the hydrogen-type molecular sieve. The modified molecular sieve prepared by the invention enables a polyolefin chain to be subjected to low-potential-energy cracking and preferentially form a C2 / C3 carbon source. The optimized catalytic system can realize high C2 / C3 species selectivity, low coke content and excellent cycle stability, and shows excellent stability and anti-coking capability. By adopting the modified molecular sieve, light molecules can be efficiently converted into the carbon nanotubes, the high carbon atom recovery rate is realized, the efficiency of converting waste plastics into the carbon nanotubes is remarkably improved, and a sustainable and widely applicable scheme is provided for carbon resource regeneration in circular economy.

The utility model relates to the technical field of chemical engineering, in particular to a novel reactor for continuously producing methyl glycolate and ethylene glycol products, which comprises a heating furnace body, an upper group of independent reaction systems and a lower group of independent reaction systems are symmetrically arranged in the heating furnace body, and each group of reaction systems comprises a material inlet. A gas-phase material and a liquid-phase material are gasified by a preheater after entering, and then enter a first reaction tube after passing through a gas distributor, a second reaction tube is connected behind the first reaction tube, and discharge tubes are arranged between the first reaction tube and the second reaction tube and behind the second reaction tube and are connected to a condenser; liquid condensed by the condenser is collected and separated by a gas-liquid separator, and the bottom of the gas-liquid separator is connected with a product extraction pipe; a gas phase condensed by the condenser is connected to the dryer through a pipeline, and an outlet of the dryer is connected to the material inlet through a pipeline. According to the reactor provided by the utility model, through the structural design, three procedures of hydrogenation reaction, activation reaction and hydrogen recycling are integrated together, so that the production process is greatly simplified, and the production efficiency is improved.

The utility model discloses a kind of cracking oil gas heat extraction systems of crude oil catalytic cracking for olefin reaction, comprising: reactor, catalytic cracking crude oil generates cracking oil gas;Quenching device, the feed inlet of quenching device is communicated with the discharge port of reactor;Quenching oil tower, the discharge port of quenching device is connected;The quenching oil tower is divided into quenching oil section, middle heat exchange section and gasoline section from bottom to top;Quenching oil section is connected with heat exchange device by pipeline, and heavy component of quenching oil section is heat exchanged with heat exchange device;Middle heat exchange section is provided with coil heat exchanger, and the component of quenching tower middle section is heat exchanged with coil heat exchanger;The top of gasoline section is equipped with gasoline component outlet.The utility model is through the combination mode of multistage multistage heat exchange, improves the cooling and heat recovery efficiency of cracking oil gas produced in the top of crude oil catalytic cracking reactor, reduces the waste of heat, improves energy utilization efficiency, also reduces coking problem simultaneously.