10results about How to "Low cracking temperature" patented technology

The invention relates to a method for regenerating acrylic acid (AA) by thermal cracking from heavy by-products (residues, referred to as LAA) from AA production units, with the aim of recycling in the plant for producing acrylic acid. The process consists of two steps: hydrolysis and cracking carried out in batches in the same reactor and improves the existing performance of the cracking plant (plant).

The invention provides high-light-transmittance polymethyl methacrylate resin and a preparation method thereof, and belongs to the technical field of high polymer materials. Comprising the following steps: carrying out catalytic cracking on waste polymethyl methacrylate resin, collecting a high-purity methyl methacrylate regenerated monomer I, uniformly mixing the high-purity methyl methacrylate regenerated monomer I with a methyl methacrylate monomer II, a comonomer III, a modifier, an initiator and a chain transfer agent serving as raw materials, and sequentially carrying out primary polymerization, secondary polymerization and tertiary polymerization, so as to obtain the polymethyl methacrylate copolymer. And then inputting the materials into a devolatilization extruder for devolatilization, extrusion molding and granulation to prepare the high-light-transmittance methyl methacrylate resin. The prepared light-transmittance polymethyl methacrylate resin is high in light transmittance, good in toughness and excellent in mechanical property, the application of the light-transmittance polymethyl methacrylate resin is greatly widened, and the light-transmittance polymethyl methacrylate resin has a wide application prospect.

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 low-carbon olefin preparation, and discloses a method and a device for preparing low-carbon olefin and application of the method and the device. According to the method provided by the invention, the crude oil can be directly used as a raw material for low-carbon olefin production, and coking of the cracking furnace is effectively slowed down by optimizing the technological process, so that the operation time is effectively prolonged. In addition, the method provided by the invention also can obtain a relatively high low-carbon olefin yield, and the discharge amount of harmful wastes is small, so that the method meets the requirements of green and sustainable development.

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 discloses an oil smoke reverse suction prevention device for an internal thread copper pipe, which relates to the technical field of non-ferrous metal processing and is used for being mounted on an annealing purging rod, an air inlet is formed in the annealing purging rod, the annealing purging rod comprises an air guide head, a conical air separation cover and a spring, the air guide head is arranged on the annealing purging rod, and the conical air separation cover is arranged on the air guide head. A gas guide head inlet and a gas guide head inner hole which are communicated with each other are formed in the gas guide head, the gas guide head inner hole is communicated with the gas inlet, the conical gas insulation cover is arranged in the annealing purging rod, one side of the conical gas insulation cover is over against the gas inlet, and the other side of the conical gas insulation cover is connected with the inner wall of the annealing purging rod through a spring. By arranging the oil smoke suck-back prevention device for the internal thread copper pipe on the air inlet of the finished annealing purging rod, inert protective gas can be conveniently guided into the annealing purging rod, meanwhile, oil smoke gas in the atmosphere in a furnace in the annealing process can be effectively prevented from being sucked back into the inner wall of the copper pipe after inert gas purging is completed, and the service life of the copper pipe is prolonged. Oil smoke is prevented from entering the copper pipe for secondary cooling condensation, so that the residual oil value of the inner wall of the copper pipe is reduced.

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 adopting petroleum raw materials and application of the method and the system. The method provided by the invention can be used for producing the low-carbon olefin by directly taking the crude oil as a raw material, and is short in production process route and high in efficiency. And by optimizing the technological process, coking of the cracking furnace can be effectively slowed down, and the operation time is effectively prolonged. In addition, the method provided by the invention also can obtain a relatively high low-carbon olefin yield, and the discharge amount of harmful wastes is small, so that the method meets the requirements of green and sustainable development.

The present invention relates to a process for recovering acrylic acid (AA) from heavy by-products (residues, referred to as LAA) from AA production units by thermal cracking for recycling in acrylic acid production plants. The method consists of two consecutive steps while improving the existing performance of the cracking plant (plant).

The invention discloses a method for regulating and controlling the morphology of in-situ SiC whiskers in a SiCf / SiC composite material based on an SLS technology, and belongs to the field of additive manufacturing of ceramic matrix composite materials. The invention aims to solve the problem that in the prior art, a toughening phase and an additive technology cannot be combined to realize high toughness of a composite material or strength and toughness regulation and control. The method comprises the following steps: 1, preparing original powder; 2, preparing an initial blank of the SiC ceramic-based composite material; 3, sintering; 4, dipping; 5, cross-linking and curing; 6, cracking; and 7, circular treatment. The method is used for regulating and controlling the morphology of the in-situ SiC crystal whiskers in the SiCf / SiC composite material based on the SLS technology.

The invention belongs to the technical field of biomass energy, and particularly relates to a catalyst applied to biomass pyrolysis and a pyrolysis method. The catalyst comprises sodium carbonate and polyferric sulfate. The sodium carbonate and the polyferric sulfate are compounded as the catalyst, so that the pyrolysis temperature of the biomass can be reduced, the pyrolysis rate is increased, and the industrial energy consumption is greatly reduced.