41 results about "Thermal depolymerization" patented technology

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

Belonging to the technical field of oil-gas field development, the invention provides a core-shell temporary plugging agent, which mainly comprises a shell capable of acidolysis of bio-based cellulose and a spherical core wrapped by the shell and capable of pyrolysis of a polymer. The molding material of the shell is hydroxypropyl methyl cellulose phthalate and sodium lignin sulfonate; the molding material of the spherical core body is a copolymer of N-isopropylacrylamide, acrylamide and sodium p-styrenesulfonate, and the temporary plugging agent has good dissolvability / degradability, has no requirements on the dissolved / degraded water quality environment, has strong adaptability to the environment and stability, and can be used as a temporary plugging agent. Accurate plugging and controllable plugging removal of a high-permeability layer of a heterogeneous oil reservoir are achieved through a double-response cooperation mechanism of'pH triggering shell layer disintegration (the threshold value is 2.5-3.5) and temperature driving core expansion (the threshold value is 60-120 DEG C) ', and the high-permeability plugging agent is suitable for fracture acidizing temporary plugging of common low-temperature oil and gas wells and can effectively meet the technical requirements of fracture acidizing temporary plugging of high-temperature deep wells. And excellent flexibility and reliability are achieved during operation, and the application prospect is good.

The invention relates to a system (1) for the thermal depolymerization of plastic waste, comprising a primary reactor (2) equipped with a heating device, an inlet (3) for feeding plastic waste, an outlet (27) for discharging an aerosol mixture, and an outlet (5) for discharging the solid residue, and the first condensation unit (4), which is equipped with the first primary vessel (10) and connected to the outlet (27) for discharging the aerosol mixture and is equipped with the outlet (6) for the liquid fraction and the outlet (7) for the gaseous fraction, further comprising a secondary reactor (8) equipped with a heating device and a catalyst and connected to the first condensation unit (4) via the outlet (6) for the liquid fraction, and further comprising the second condensation unit (9) which is connected to the secondary reactor (8).wherein a siphon-like pressure barrier (26) is arranged between the primary reactor (2) and the secondary reactor (8) and is placed in the first primary vessel (10).

The invention discloses a preparation method and application of a Zn-N-C electrocatalyst for synthesizing H2O2. A Zn-N-C electrocatalyst with high selectivity for synthesizing H2O2 is synthesized by using polypyrrole nanowires as a carbon and nitrogen source and ZIF-8 of a zeolite structure as a metal zinc source, wherein metal Zn is loaded on a nitrogen-doped carbon material in the form of a single atom, and the loading amount of metal Zn is 5wt%-25wt%. The selectivity of the Zn-N-C electrocatalyst for catalytic synthesis of H2O2 is close to 100%. The present invention uses polypyrrole as a carbon and nitrogen source, which is easier to anchor metal zinc ions. The catalyst is formed by one-step pyrolysis of a composite material of polypyrrole and ZIF-8, has a simple preparation process, and the electrocatalyst raw materials are widely available and low in cost.

A method for catalyzing the thermal decomposition of polyβ-hydroxybutyrate using a metal catalyst. The present invention belongs to the technical field of chemical recovery of organic materials. The present invention addresses the technical problem that existing methods for thermal decomposition of discarded polyβ-hydroxybutyrate require harsh conditions and the use of toxic catalysts, and lack a green catalytic system and method that can quickly and efficiently thermally decompose polyβ-hydroxybutyrate under mild conditions. The present invention uses green and environmentally friendly metal zinc and magnesium catalysts to catalyze the thermal decomposition of polyβ-hydroxybutyrate. The catalyst is non-toxic and odorless, has little harm to the environment, and can avoid the harm to the ecological environment caused by the use of other toxic metal catalysts. At the same time, the catalytic system of the present invention has a high catalytic efficiency and can catalyze the rapid and efficient thermal decomposition of polyβ-hydroxybutyrate under mild conditions, thereby avoiding the increase in energy consumption caused by reaction conditions such as high temperature and high pressure. It is helpful to achieve green recycling of discarded polyβ-hydroxybutyrate plastics.

The invention relates to a synthesis process of cyclopentyl methyl ether CPME, which firstly depolymerizes dicyclopentadiene DCPD to cyclopentadiene CPD through a depolymerization kettle at high temperature, then mixes the cyclopentadiene CPD with hydrogen and enters a hydrogenation catalytic distillation tower to generate cyclopentene CPE through a selective hydrogenation reaction, and then etherifies the cyclopentene CPE with methanol to obtain cyclopentyl methyl ether CPME, and the etherification reaction adopts a fixed bed and catalytic distillation combined process. The process of the invention is simple, energy-saving, and highly feasible; the hydrogenation and etherification catalysts have high conversion rates and good selectivity, and the process has the characteristics of high total conversion rate and good selectivity; through the selective hydrogenation of raw material C5, dienes are removed, which is conducive to extending the service life of the etherification catalyst, and the catalytic distillation process is adopted to make the temperature distribution of the reaction temperature area stable, the reaction heat is fully utilized, and the heat consumption is reduced.

This invention provides a photocatalytically modified asphalt based on waste rubber powder and its preparation method. The modified asphalt achieves this by precisely controlling the ratio of waste rubber powder, matrix asphalt, and a smoke suppressant made of graphite-phase carbon nitride. Simultaneously, a segmented gradient temperature-controlled calcination process is employed to prepare graphite-phase carbon nitride with a specific band gap. This ensures good interfacial compatibility among the raw material components, stable system formulation, and uniform and controllable precursor pyrolysis and polymerization reactions. Consequently, the graphite-phase carbon nitride possesses both porous physical adsorption and visible light photocatalytic activity. This allows for efficient adsorption and long-lasting photocatalytic degradation of asphalt fumes while fully preserving the excellent road performance and workability of the waste rubber powder-modified asphalt. The final product is a photocatalytically modified asphalt with simple components, controllable cost, excellent compatibility, long-lasting and stable smoke suppression effect, good process repeatability, and suitability for industrial mass production and widespread application in highway pavement engineering.

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

Plant (1) for the thermal depolymerization of plastic waste, comprising a primary reactor (2) equipped with a heating device, an inlet (3) for feeding with plastic waste, an outlet (27) for discharge of an aerosol mixture of gaseous and liquid molecules and an outlet (5) for discharge of the solid residue, and the first condensation unit (4), which is equipped with the first primary vessel (10) and connected to the outlet (27) for discharge of the aerosol mixture of gaseous and liquid molecules from the primary reactor (2) and is equipped with the outlet (6) for the liquid fraction and the outlet (7) for the gaseous fraction, characterized in that it further includes a secondary reactor (8) which is equipped with a heating device and a catalyst and is connected to the first condensation unit (4) via the outlet (6) of the liquid fraction,and further includes the second condensation assembly (9) which is connected to the secondary reactor (8), wherein a siphon-like pressure barrier (26) placed in the first primary vessel (10) is arranged between the primary reactor (2) and the secondary reactor (8).

The invention relates to the technical field of waste composite material resourceful treatment, in particular to a waste wind power blade resourceful recycling method and system based on high-temperature plasmas. The method comprises the steps that waste wind power blades are subjected to cutting and foreign matter removal, vacuum infiltration type interface weakening pretreatment and pre-sorting and forming treatment, and fiber main line feeding is obtained; feeding the resin component into an outer ring vortex region of a vortex gradient plasma selective depolymerization reactor, introducing carrier gas to form a vortex flow field, and constructing an aerodynamic heat shielding layer between the vortex flow field and a central high-energy region, so that the resin component is subjected to thermal depolymerization and desorption in the outer ring vortex region, and generated cracked volatile matters enter the central high-energy region to be subjected to gas-phase reforming; the fiber solid phase is limited in the outer ring vortex area and moves along the path, separation of the two treatment paths is achieved, the desorbed fiber solid phase is subjected to cooling and in-situ surface treatment and recovery, reaction gas is subjected to quenching, dust removal and purification treatment, efficient resin conversion and fiber protection and recovery are both considered, and the fiber integrity and the recycling value are improved.

A geothermal system including a heat-driven process system using heat extracted from a magma wellbore for driving a thermal process. The system includes a magma wellbore connected to the heat-driven process system in a closed loop. A heated heat transfer fluid conveys the heat from the magma wellbore to a reactor housing a decomposition reaction. The reactor can be a batch reactor, a continuous reactor, or a through-flow reactor. The heat provides the reaction temperature necessary for driving the decomposition reaction of a polymer to an end product. The heat can be provided directly by the heated heat transfer fluid, by an intermediate heat transfer fluid heated by the heated heat transfer fluid, or by a reaction medium heated by the heated heat transfer fluid.

A container for a power storage device of the present embodiment is a container for a power storage device such as a transport container for when a single or a plurality of power storage devices are externally packaged and transported or moved, or a storage container for when a single or a plurality of power storage devices are externally packaged and stored. This container for a power storage device has a structure in which a thermally-depolymerizable polymer foam molded body is disposed in a gap between a container body that houses the power storage device and a region where the power storage device is housed in the container body. Such a container for a power storage device makes it possible to reduce the risk of fire spreading to the outside of the container when an abnormality occurs in a high-temperature environment or there is damage to the power storage device.

A method and a system for injecting multiple tracer tag fluids into the wellbore are described. The method includes determining multiple injection concentrations of multiple respective tracer tag fluids, determining an injection sequence of the tracer tag fluids into a wellbore, and injecting the tracer tag fluids into the wellbore according to the injection concentrations and the injection sequence. The tracer tag fluids include synthesized polymeric nanoparticles suspended in a solution. The synthesized polymeric nanoparticles are configured bind to a wellbore cutting. The synthesized polymeric nanoparticles are configured to undergo a thermal de-polymerization at a respective temperature and generate a unique mass spectra. The injection sequence includes an injection duration determined by a depth interval of the wellbore to be tagged by the synthesized polymeric nanoparticles and an injection pause to prevent mixing the multiple tracer tag fluids in the wellbore.

This flame retardant for plastics comprises any of a thermally depolymerizable polymer to which a water-soluble functional group, e.g., a carboxylic acid group or a sulfonic acid group, has been imparted, an alkali metal salt of the thermally depolymerizable polymer, and an alkaline-earth metal salt of the thermally depolymerizable polymer. Poly(methacrylic acid), for example, is preferred as the thermally depolymerizable polymer having a structure to which a water-soluble functional group has been imparted. Such flame retardant for plastics contains neither a halogen nor nitrogen nor phosphorus in the molecule and can suitably make general-purpose plastics flame-retardant.

This invention provides a method and apparatus for preparing monomers from polymethyl methacrylate (PMMA) through electromagnetic induction pyrolysis, belonging to the field of pyrolysis polymerization. The method includes: heating a metal catalyst heat carrier and a ceramic heat carrier in a rotating bed reactor to the depolymerization temperature of PMMA using electromagnetic induction; then adding crushed PMMA waste or raw materials, and the depolymerization reaction generates monomers. The apparatus is a rotating bed reactor, comprising a feeding system, a rotating reaction system with an electromagnetic induction heating system on its periphery, and a discharging system arranged sequentially. This invention utilizes electromagnetic induction heating technology, resulting in high heat transfer efficiency, good temperature control, and low heat loss; the improved rotating bed design ensures uniform temperature; and the combined use of a metal catalyst heat carrier and a ceramic heat carrier significantly shortens the heating time and improves the pyrolysis polymerization efficiency, enabling rapid and efficient pyrolysis polymerization of PMMA.

The present invention belongs to the field of resource utilization of waste plastics. Specifically disclosed is a method for preparing a vinyl-terminated polymer by means of rapid laser pyrolysis of a polyolefin. The preparation method comprises the following steps: first, taking a polyolefin as a raw material, and adding a light-absorbing agent having a certain concentration thereto by means of the processes of melting and mixing; and then, under the protection of an inert gas, initiating high-temperature decomposition of the polyolefin by means of laser irradiation, and condensing and collecting a decomposition product, thereby obtaining a vinyl-terminated polymer. The polyolefin pyrolysis technique provided by the present invention realizes rapid pyrolysis of a polyolefin by means of laser heating, and is simple in terms of process, controllable and pollution-free during implementation, and high in terms of product yield. Characterized by rapidness and uniformity, laser heating has no heat transfer limitation or temperature gradient, reduced energy consumption during cracking, and improved cracking efficiency in comparison with traditional heating modes; and a high proportion of a vinyl-terminated polymer product is obtained, and separation is not required.

A method and system for avoiding false alarm in thermal depolymerization detection of an organic insulating material, and the method comprises the steps: obtaining historical data of environmental parameters in a power distribution cabinet, evaluating the corresponding thermal depolymerization condition of the organic insulating material, and defining the data obtained through evaluation as a thermal depolymerization factor; performing adaptive normalization on each environment parameter in the historical data; performing data fusion on the normalized environment parameters in four dimensions to obtain a fusion feature data set in four dimensions; mutual information and correlation coefficients of the fusion feature data sets in the four dimensions and the corresponding thermal depolymerization evaluation factors are calculated respectively, and the fusion feature data set with the maximum influence is comprehensively selected; and establishing a prediction model based on a BP neural network, inputting a data fusion result into the prediction model to obtain a predicted thermal depolymerization evaluation factor, and giving an alarm if the predicted thermal depolymerization evaluation factor exceeds a set alarm factor. According to the invention, the influence between environment parameters is fully considered, and the alarm efficiency and accuracy are improved.

The present invention provides a flame-retardant water-based paint composition that can form a coating with good flame retardancy on buildings and building materials. [Solution] The flame-retardant water-based paint composition contains (A) a water-based binder resin and (B) a non-halogen-based water-soluble synthetic polymer flame retardant. As (B) the non-halogen-based water-soluble synthetic polymer flame retardant, a thermally depolymerizable polymer having a structure to which a water-soluble functional group having a specific structure is attached, its alkali metal salt, or its alkaline earth metal salt can be suitably used. In particular, poly(methacrylic acid), its alkali metal salt, or its alkaline earth metal salt can be suitably used.

The application discloses a reversible acrylate adhesive with excellent secondary bonding strength and a preparation method, a use method and an application thereof. The adhesive is a new reversible acrylate adhesive formed by combining the reversible anthracene group with the good double bond environment and pressure-sensitive characteristics of the acrylate system. Through the steps of photocuring, thermal depolymerization and photocuring, the problem of reduced strength after secondary bonding of the existing reversible adhesive is overcome, and the shear strength after secondary bonding is increased by 42% compared with that after primary bonding. In addition, the debonding rates of the adhesive in the present application in two debonding processes are 91% and 82% respectively, and the adhesive has good debonding performance. Therefore, the reversible acrylate adhesive can be effectively applied in the electronic field and solve the problem of poor mechanical properties after secondary bonding in the existing reversible electronic adhesive field.

The invention relates to a resourceful treatment process for an alkylation byproduct low-boiling-point substance in a BHT production process. The process mainly comprises three steps of preheating depolymerization, multi-stage water washing and phase separation purification, wherein firstly, low-boiling-point substances are preheated and depolymerized at the temperature of 50-60 DEG C, and residual isobutene is recovered; then, through three times of countercurrent water washing, TBA is transferred to a water phase by utilizing the hydrophilicity of TBA, and DIB is retained in an oil phase; and finally, concentrating and purifying the water phase by adopting a stripping tower to obtain industrial grade TBA with the concentration of more than or equal to 98wt%, rectifying the oil phase by adopting normal pressure to obtain industrial grade DIB with the concentration of more than or equal to 95wt%, and carrying out incineration treatment on residual liquid. According to the method, thermal activation and water washing are combined, the TBA / DIB azeotropic separation problem is effectively solved, high-energy-consumption azeotropic distillation is replaced, the technological process is simple, the operation condition is mild, the equipment requirement is low, the amount of hazardous waste can be reduced by 90% or above, the recycled product meets the relevant national standard, the resource utilization rate is high, economical efficiency is good, and industrial application and popularization are easy.

The invention discloses a method for preparing dicarboxylic acid and aniline by synergistic treatment of waste polyester and nitrobenzene. The invention directly mixes polyester waste plastic, nitrobenzene and a noble metal-supported catalyst in a certain proportion and adds them to water, and uses the catalytic properties of the catalyst as a link to couple the hydrothermal depolymerization reaction of the polyester waste plastic and the in-situ redox reaction of the depolymerization product with nitrobenzene under specific hydrothermal conditions, and directly obtains dicarboxylic acid and aniline in a one-step method, while realizing high-value recycling of polyester waste plastic and nitrobenzene in wastewater. The catalyst has high catalytic efficiency in the reaction, is easy to separate and recycle, can be reused, and effectively reduces the reaction cost. In addition, the process is simple and ingenious, has low energy consumption, has extremely high industrial application value, and does not cause secondary pollution to the environment.

A vertically oriented screw (3) takes up material at the bottom of the reactor (1), the material is then at least partially compressed by the rotating screw (3) to form a gas-tight plug and is moved downwards through the vertical transfer channel (2). The reactor (1) has a rotary agitator (5), the axis of rotation of which is coincident with the axis of rotation of the screw (3), preferably the agitator (5) and the screw (3) are mounted on a common shaft assembly (6). If the agitator (5) rotates in the first direction, it mixes the mass inside the reactor (1), if it rotates in the second direction, it directs the material into the inlet mouth of the transfer channel (2), while the screw (3) moves the material downwards in the transfer channel (2). The reactor (1) includes a vertically oriented transfer channel (2), inside of which there is a rotating screw (3). The inlet of the transfer channel (2) is at the bottom of the reactor (1), with the upper end of the screw (3) at the inlet of the transfer channel (2) or above the inlet of the transfer channel (2). The transfer channel (2) may be provided with a valve (4) at its bottom.

The invention discloses a high-light-fastness differential special uniform fabric and a preparation method thereof. The high-light-fastness differential special uniform fabric is prepared from polyester fibers, polybasic acid, a phosphorus flame retardant, nano ZnO, a melt spinning aid, a dyeing agent, a color fixing agent and an antistatic agent. The preparation method comprises the following steps: step 1, raw material pretreatment; step 2, melt spinning; step 3, dyeing treatment; step 4, fixation treatment; step 5, applying an antistatic agent; step 6, quality control and performance test; by adding the novel color fixing agent, a layer of uniform and compact film can be formed on the textile fabric, the possibility of color fading of dye due to photochemical reaction is reduced, sufficient combination of the dye and fibers is facilitated, the dyeing uniformity and fastness are improved, and by adding the phosphorus flame retardant, the thermal decomposition speed of the polyester fibers is increased, and the color fastness of the textile fabric is improved. And the pyrolysis polymer is esterified and dehydrated through polybasic acid to form a carbonaceous layer to prevent oxygen and heat transfer, so that the purpose of improving the flame retardant property is achieved.

The present invention relates to a de- and rebondable polymer prepared from the reaction between a difunctional mercaptan hardener; and a difunctional thiol-reactive resin. The resultant polymer has a softening point greater than about 70 °C, preferably about 90 °C to about 150 °C.

A process for preparing polyethylene and polypropylene polyolefin waxes by thermal depolymerization of polyethylene and polypropylene thermoplastic resins, and preparing polyethylene waxes within a certain viscosity range and molecular weight to transform into 100% biodegradable polyethylene waxes in a short period of time; the depolymerization process discloses a reaction of polyethylene thermoplastic resins to prepare polyethylene waxes provides a chemical transformation in the molecules of the polyethylene wax, making them subject to subsequent oxidation; the oxidized polyethylene waxes obtained has excellent quality and are also waxes with biodegradability characteristics in a short period of time, such as the original non-oxidized waxes; such oxidized waxes can be emulsified or dispersed in an aqueous medium, while maintaining the biodegradability characteristics, as the original oxidized waxes, and enabling the use in liquid, semi-pasty or pasty form.

The invention discloses a method for producing sustainable aviation fuel by catalytically pyrolyzing polyolefin waste plastics through a metal-hierarchical pore molecular sieve, which comprises the following steps: preparing metal and a hierarchical pore molecular sieve: firstly, adding a quantitative nano carbon material as a mesoporous template in a hydrothermal synthesis process of the molecular sieve, and then calcining the nano carbon material at high temperature to obtain the metal-hierarchical pore molecular sieve. The preparation method comprises the following steps: preparing a mesoporous molecular sieve through a hydrothermal method to obtain a hierarchical pore molecular sieve rich in mesopores, loading a certain amount of active metal on the hierarchical pore molecular sieve rich in mesopores through a wet impregnation method to obtain a bifunctional metal-hierarchical pore molecular sieve, and carrying out catalytic cracking on polyolefin through the metal-hierarchical pore molecular sieve to convert the polyolefin into SAFs. Mesopores are introduced through a template method to control pore channel spatial characteristics, a hierarchical pore molecular sieve of a micro-mesoporous composite structure is synthesized, then the acid strength and the acid density of the catalyst are regulated and controlled by loading active metal, and the bifunctional molecular sieve with matched acidity and pore structure is obtained.