277 results about "Cycloalkane" patented technology

The invention relates to the technical field of hydrogen storage and release, and discloses a cyclic hydrogen storage and release system based on aromatic cycloalkane reaction, which comprises a hydrogenation reaction unit, a dehydrogenation reaction unit, a gas-liquid separation and compression unit and an adsorption and purification unit which are sequentially connected through pipelines, the hydrogenation reaction unit, the dehydrogenation reaction unit and the gas-liquid separation and compression unit are respectively connected with the heat exchange unit; the hydrogen storage function and the hydrogen desorption function are integrally designed, the microwave heat supply dehydrogenation reactor is designed for the dehydrogenation reaction link with high energy consumption, and compared with the prior art, the microwave heat supply dehydrogenation reactor has the advantages that the heat transfer resistance is reduced, the reaction efficiency is improved, and the energy loss is reduced. The designed gas-liquid separation and adsorption purification technology is coupled, only one compressor is used in the whole process, the purification process is effectively simplified, the operation is simple and convenient, the equipment cost and the hydrogen purification cost are reduced, and the hydrogen yield and the hydrogen storage carrier cyclic utilization rate are improved. The system has the advantages of high hydrogen storage and release efficiency, small system size, high mobility and the like.

The invention discloses a metal modified molecular sieve catalyst and a preparation method and application thereof. The catalyst is a metal-loaded molecular sieve which is modified by post-treatment after a metal component is loaded on the molecular sieve; the molecular sieve is selected from at least one of H-ZSM-5, H-Beta, H-ZSM-35, H-MOR, H-MCM-22, H-ZSM-11 and H-ZSM-22, and the molecular sieve is selected from at least one of H-ZSM-5, H-Beta, the metal is loaded on the molecular sieve through ion exchange and / or impregnation; the post-treatment modification is selected from at least one of heating treatment, water vapor treatment and silanization treatment. The metal component of the catalyst can catalyze dehydrogenation reaction and carbon dioxide activation, the molecular sieve component provides a substance diffusion channel and an acid center, and post-treatment modification can regulate the distribution of the molecular sieve acid center and improve the hydrothermal stability of the catalyst. The catalyst can efficiently promote the coupling reaction of cycloalkane and carbon dioxide, the selectivity of aromatic hydrocarbon reaches 90% or above, and the conversion rate of carbon dioxide reaches 20% or above.

The invention belongs to the technical field of organic dye synthesis and application, and discloses a conjugated compound containing a benzothiophenazine structure as well as a preparation method and application thereof, and the conjugated compound containing the benzothiophenazine structure has excellent photophysical properties, singlet oxygen yield and superoxide anion generation capacity. The novel conjugated compounds ENBO-NI and ENBS-NI containing benzothiophenazine structures are successfully prepared by replacing a benzene ring of Nile blue with a cycloalkane structure and adjusting the electron donating ability of an R1 group. The two compounds have near infrared fluorescence emission, good solubility and relatively high ROS yield. Compared with a classical photosensitizer NB, the singlet oxygen yield of ENBO-NI is increased by about 117.65%, and the singlet oxygen yield of ENBS-NI is as high as 70%. The absorption wavelength of the conjugated compound is in a red light wave band. The preparation process is simple and efficient, large-scale production is easy, and the preparation method has a wide clinical application prospect.

The invention relates to the technical field of energy storage safety, and particularly discloses flame-retardant cooling liquid, a preparation method of the flame-retardant cooling liquid, an immersed energy storage device, a data center and electric equipment. According to the present invention, the base oil is at least one of the liquid halogenated alkane containing 2-6 carbon atoms, the liquid halogenated olefin, the liquid halogenated ketone and the liquid halogenated cycloalkane containing 3-6 carbon atoms, such that the high biodegradability of the base oil is maintained, the system viscosity is effectively reduced, the heat dissipation performance is improved, the insulating property of the base oil is significantly improved, and the service life of the base oil is prolonged. Meanwhile, the flame retardance is further enhanced. Therefore, the heat management efficiency of the cooling liquid is remarkably improved while environmental protection and safety are considered, and the cooling liquid has a good application prospect.

A production method of a rubber plasticizer is characterized in that a solvent extraction method is used, a first solvent comprises one of phenol, furfural, N-methyl pyrrolidone and dimethyl sulfoxide and enters the upper portions of a first extraction tower and a second extraction tower, a second solvent is alkane and / or cycloalkane with the carbon number of 6-20 and enters the lower portions of the three extraction towers, raw material oil is extract oil, and the second solvent is one of phenol, furfural, N-methyl pyrrolidone and dimethyl sulfoxide. Raw oil enters from a middle feed port of the first extraction tower; raffinate flowing out of the top of the first extraction tower enters a middle feed port of the second extraction tower after part of the solvent is recovered; evaporating secondary raffinate flowing out from the top of the second extraction tower to recover the solvent, thereby obtaining the rubber plasticizer; heating a material flowing out from the top of the third extraction tower, recovering part of solvent, pumping into a raw oil inlet of the primary extraction tower by using a pump, mixing with raw oil, and entering the primary extraction tower; and evaporating the effluent extract at the bottoms of the first extraction tower and the third extraction tower to recover the solvent to obtain secondary extract oil.

To provide materials for organic devices such as materials for organic EL elements, comprising compounds different from conventional ones, in order to increase options for materials for organic EL elements.SOLUTION: Options for materials for organic devices such as materials for organic EL elements are increased by condensing a cycloalkane to a polycyclic aromatic compound in which a plurality of aromatic rings are linked together by boron atoms, oxygen atoms, and the like. By using a novel cycloalkane-condensed polycyclic aromatic compound as a material for an organic EL element, for example, an organic EL element having excellent emission efficiency and element life is provided.SELECTED DRAWING: None

To provide a compound useful as a material for an organic device such as an organic electroluminescent element.SOLUTION: Polycyclic aromatic compounds having a structure consisting of one or two or more structural unit (s) represented by the formula (1); (Ra1 to Ra3, Rb1 to Rb4, Rc1 to Rc4 are independently H or substituents; provided that at least one of Rc1 to Rc4 is a group represented by the formula (1-1); Y1 is B; and are independently> N-RNX; RNX is substituted / unsubstituted aryl; at least one of the aryl ring and the heteroaryl ring in the above structure may be fused with at least one cycloalkane, and H in the above structure may be replaced by D. X1 X2. ) SELECTED DRAWING: None

An electrophotographic photosensitive member includes a conductive substrate, an intermediate layer provided on the conductive substrate, and a photosensitive layer provided on the intermediate layer. The intermediate layer contains a specific polyamide resin and specific inorganic particles. The specific inorganic particles each include a metal oxide particle and a surface treatment layer covering at least a part of the surface of the metal oxide particle. The surface treatment layers contain a component derived from an organic siloxane compound and at least one of aluminum oxide and silica. The specific polyamide resin includes a first repeating unit derived from an aliphatic dicarboxylic acid with a carbon number of at least 8 and no greater than 20 and a second repeating unit derived from a diamine compound with a cycloalkane structure.

The invention belongs to the technical field of asphalt processing, and discloses high-viscosity rubber modified asphalt and a preparation method thereof.The high-viscosity rubber modified asphalt is prepared from 70 # matrix asphalt, graded vulcanized rubber powder, a linear SBS polymer, C5 petroleum resin type terpene resin, cycloalkane oil, polyisobutene modified nano-zinc oxide and a sulfur cross-linking stabilizer; by combining a three-dimensional network structure formed by the cross-linking stabilizer, the layering risk caused by density difference is remarkably reduced, the factory production and transportation period is prolonged, the anti-aging performance is further improved through the synergistic effect of the nanometer material and vulcanization, the asphalt is endowed with better elastic recovery and anti-fatigue capacity, and the service life of the asphalt is prolonged. And the whole formula breaks through the limitation of the mixing amount of the traditional rubber powder, the fluidity of the mixture is optimized while the high viscoelastic characteristic is ensured, the problems of wheel sticking during paving and non-uniform void ratio are solved, the construction efficiency and the pavement durability are considered, and the efficient cyclic utilization of waste rubber resources is promoted.

The present application provides an electrolyte additive, an electrolyte and a battery, wherein the electrolyte additive includes a first additive and a second additive; the first additive includes a compound represented by formula I: R1, R2 and R3 each independently include any one of H, F, C1-C4 alkyl, C1-C4 fluoroalkyl, C2-C4 alkenyl, C2-C4 fluoroalkenyl, C2-C4 alkynyl, C5-C7 cycloalkane, R4 substituted phenyl and R5 substituted benzyl; R4 and R5 are each independently selected from H, C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, C1-C4 fluoroalkyl, C 2‑ Any one of a C4 fluoroalkenyl group and a C2-C4 fluoroalkynyl group; the second additive comprises an isocyanate compound. The electrolyte additive of the present application forms an interfacial film on the electrode surface that is highly stable, smooth, uniform in thickness, flexible, highly conductive, and corrosion-resistant, resulting in excellent cycling stability and high-temperature storage performance under high-voltage conditions.

The present disclosure relates to an inhibitor for promoting collagen expression, the inhibitor having a structural formula as shown in the following formula (I). The azacycloalkane compound and a pharmaceutical composition thereof provided in the present disclosure have significant Rho kinase inhibitory activity, have better enzymatic activity and cell activity than existing ROCK inhibitors such as Ripasudil, Netarsudil and belumosudil, and have JAK inhibitory activity. Therefore, the compound and composition have great application potential.

The invention discloses a high-yield and low-carbon-deposition regulation and control method and system for a continuous regenerative catalytic reforming reaction. The method comprises the following steps: at the beginning, setting a weighted average inlet temperature for the four-in-one reforming reactor and setting an inlet temperature of each bed layer; measuring the content of naphthenic hydrocarbon in naphtha to be added at the beginning, and setting the initial average pressure of the four-in-one reforming reactor according to the content of naphthenic hydrocarbon in naphtha to be added; naphtha is added into the four-in-one reforming reactor for a reaction; in the reaction process, the weighted average inlet temperature of the four-in-one reforming reactor, the inlet temperature of each bed layer, the catalyst circulation rate and the average pressure are regulated and controlled in real time; and ending the experiment. The method breaks through the critical path of the current technical bottleneck, and has important significance for improving the product selectivity of the continuous regeneration catalytic reforming process, reducing the energy consumption and prolonging the service life of the catalyst.

The present application relates to a kind of polycrystalline cluster ZSM-5 molecular sieve and its preparation method and application.The polycrystalline cluster ZSM-5 molecular sieve has at least two typical most probable pore diameters in the range of 5-50nm.During the preparation of the molecular sieve, two alkali sources (M1 and M2) are used, wherein the mass ratio of the two alkali sources M1 / M2 satisfies the following relationship: 0.1≤n(M1) / n(M2)≤10.0.The polycrystalline cluster ZSM-5 molecular sieve has higher propylene selectivity for large molecule naphthene ring-opening cracking.

The invention relates to a method for detecting a clearing agent main agent in gasoline, and the method comprises the following steps: carrying out thin-layer chromatography detection on a to-be-detected sample, and determining the composition of the clearing agent main agent in the concentrated to-be-detected sample according to color spot distribution on an obtained thin-layer chromatography plate, wherein the clearing agent main agent comprises one or more of a polyether amine clearing agent, a polyisobutene amine clearing agent and a Mannich base clearing agent; the thin-layer chromatography detection sequentially comprises developing and developing treatment; a developing agent for developing comprises one or more of a developing agent I, a developing agent II and a developing agent III; the developing solvent I is methanol, and the developing solvent II and the developing solvent III comprise one or more of alcohol with the carbon atom number of 1-6, aliphatic hydrocarbon with the carbon atom number of 5-12 and cycloalkane with the carbon atom number of 5-12. According to the method provided by the invention, whether the clearing agent main agent is added into the sample to be detected or not can be rapidly determined, and the type of the clearing agent main agent can be rapidly and accurately detected.

The invention provides an azacycloalkane compound as shown in a formula I, pharmaceutically acceptable salt, hydrate, isomer, prodrug or a mixture thereof, a pharmaceutical composition containing the azacycloalkane compound, and application of the azacycloalkane compound and the pharmaceutically acceptable salt, hydrate, isomer, prodrug or the mixture thereof in preparation of drugs for preventing, relieving or treating related diseases caused by interaction with Menin-MLL protein.

The invention provides a cycloalkane separation method, a computer program product and a cycloalkane detection system. The method comprises the steps that a detection device is controlled to separate compounds, the one-dimensional retention time of all the compounds in a one-dimensional chromatographic column is obtained, the two-dimensional retention time of all the compounds in a two-dimensional chromatographic column is obtained, the one-dimensional retention time is the time needed for separating out the compounds through the one-dimensional chromatographic column, and the two-dimensional retention time is the time needed for separating out the compounds through the two-dimensional chromatographic column. The two-dimensional retention time is the time required for separating the compound by the two-dimensional chromatographic column; a target compound in the separated compounds is determined according to the one-dimensional retention time and the two-dimensional retention time of the separated compounds, and the target compound is cyclohexane or cyclopentane; the content of the target compound is obtained, the content is sent to target equipment, and the target equipment is equipment used by the target object, so that the target object is guided to improve the catalyst. According to the scheme, the problem that cycloalkanes (cyclohexane or cyclopentane) cannot be rapidly measured in the prior art is solved.

This invention relates to rare-earth single-atom doped alumina-supported platinum cluster catalysts, their preparation methods, and applications. The catalyst comprises a catalyst support and platinum nanoclusters dispersed on the catalyst support. The catalyst support is an alumina support doped with rare-earth elements in single-atom form. The preparation method includes the following steps: Step 1: preparing a rare-earth-aluminum composite metal oxide precursor; Step 2: preparing a catalyst support; Step 3: loading platinum onto the catalyst support; Step 4: activating the platinum-supported catalyst support. The catalyst is applied in the dehydrogenation reaction of cycloalkane. This invention, by precisely doping rare-earth elements into the alumina lattice in single-atom form, constructs stable rare-earth-oxygen active sites within the lattice, significantly promoting the migration and diffusion of hydrogen atoms from the platinum clusters to the support surface, thereby greatly enhancing the hydrogen spillover effect, improving the utilization efficiency of active hydrogen, and achieving precise control over complex reaction pathways.

The invention discloses a preparation method and application of a Beta molecular sieve catalyst rich in outer surface B acid, and solves the technical problem that the existing efficient catalyst is unstable in structure. The preparation method comprises the following steps: synthesizing the H-Beta carrier rich in the outer surface B acid: drying Beta zeolite raw powder without removing a template agent, then carrying out ion exchange for 2 hours by using an NH4Cl aqueous solution, washing a solid with water, drying, repeating the ion exchange process, and roasting the obtained ion exchange solid at 550 DEG C for 4 hours to obtain the H-Beta carrier rich in the outer surface B acid; and preparing the supported bifunctional catalyst: loading the metal Ir onto the H-Beta carrier rich in the B acid on the outer surface by an equivalent impregnation method. The Beta molecular sieve disclosed by the invention is rich in outer surface B acid, is used for a catalytic reaction for synthesizing high-density endothermic aviation fuel by converting polycycloalkane, provides higher reaction active site density and promotes diffusion of macromolecular cycloalkane.

A process for upgrading a naphtha feed includes separating the naphtha feed into at least a light naphtha fraction, contacting the light naphtha fraction with hydrogen in the presence of at least one cyclization catalyst, and contacting the cyclization effluent with at least one cracking catalyst. Contacting the light naphtha fraction with hydrogen in the presence of at least one cyclization catalyst may produce a cyclization effluent comprising a greater concentration of naphthenes compared to the light naphtha fraction. Contacting the cyclization effluent with at least one cracking catalyst under conditions sufficient crack at least a portion of the cyclization effluent may produce a fluid catalytic cracking effluent comprising light olefins, gasoline blending components, or both. A system for upgrading a naphtha feed includes a naphtha separation unit, a cyclization unit disposed downstream of the naphtha separation unit, and a fluid catalytic cracking unit disposed downstream of the cyclization unit.

The application provides a pre-leaching auxiliary solvent extraction method for oil sand or oil sludge containing heavy crude oil, and belongs to the technical field of product separation and solid waste treatment in the field of petroleum chemical industry. The bitumen is dispersed by using aromatic hydrocarbon first, and then extracted by using naphthenic hydrocarbon, so that good extraction effect can be achieved, a surfactant does not need to be added, the solid phase residual oil rate after treatment is less than 1wt%, and the national relevant standard is met; the pre-leaching agent and the extractant used in the application have low boiling points, are easy to distill and recover, and the recovery rate is greater than 85%. In addition, the method provided by the application has the operation temperature of room temperature (20-30 DEG C), the operation condition is mild, the method is simple, the energy consumption is low, the organic solvent and the crude oil (containing bitumen and other heavy components) can be recovered by distillation, and the resource utilization is realized.

The present disclosure relates to a method for separating naphtha, comprising: feeding naphtha and a first desorbent into a first adsorption separation tower for first adsorption separation to obtain a first extract and a first raffinate; feeding the first raffinate into a first rectifying tower for first rectification treatment to obtain a first stream mainly containing cycloalkanes and alkanes; feeding the first stream and a second desorbent into a second adsorption separation tower for second adsorption separation to obtain a second extract and a second raffinate; feeding the second raffinate into a second rectifying tower for second rectification treatment to obtain a second stream mainly containing alkanes; feeding the first extract and the second extract into a third rectifying tower for third rectification treatment to obtain a third stream mainly containing aromatic hydrocarbons and cycloalkanes; wherein the first desorbent is selected from heavy aromatic hydrocarbon components, and the second desorbent is selected from light hydrocarbon components. The method of the present disclosure has low cost, simple process, high separation purity and high yield.

The invention discloses application of a hierarchical pore nanoreactor catalyst in preparation of saturated cycloalkane, and belongs to the technical field of catalysts. The method comprises the following steps: uniformly dispersing ZIF-8 in a solvent, adding dopamine hydrochloride and amino acid, stirring at a certain temperature, and carrying out suction filtration and drying to obtain a dopamine-amino acid polymer modified ZIF-8 composite material; dispersing the composite material and a metal precursor in a solvent, uniformly stirring, and carrying out vacuum drying to remove the solvent; and carrying out segmented roasting in an inert atmosphere to obtain the required hierarchical pore nano-reactor catalyst. The catalyst is applied to preparation of saturated cycloalkanes by hydrogenation of polycyclic aromatic hydrocarbons, and specifically, a solvent, polycyclic aromatic hydrocarbons, the catalyst and hydrogen are mixed for a catalytic hydrogenation reaction. The hierarchical pore hollow structure of the catalyst can significantly promote diffusion and enrichment of polycyclic aromatic hydrocarbon molecules of different sizes, and rich pyridine nitrogen sites have strong adsorption and activation capabilities on polycyclic aromatic hydrocarbon and hydrogen molecules.

The application provides application of a hydrocarbon solvent in a full solid battery, a positive electrode sheet, a negative electrode sheet and a full solid battery. The full solid battery comprises a binder, the binder comprises a polyolefin binder and / or a styrene block binder, and the hydrocarbon solvent comprises paraffin and naphthene; the flash point of the hydrocarbon solvent is greater than or equal to 60 DEG C, and the distillation range of the hydrocarbon solvent is greater than or equal to 200 DEG C. The hydrocarbon solvent solves the problems of poor solubility and dispersibility of the polyolefin binder or the styrene block binder in the solvent, easy gelation, floating of the binder and reaction metamorphosis of sulfides in a processing process.

The invention is related to a process for synthesizing a sustainable aviation fuel composition. The process comprises providing a reaction mixture comprising a first compound that is at least one of mevalonolactone, mevalonic acid, mevalonate salt, dehydromevalonic acid, dehydromevalonate salt, dehydromevalonolactone or combinations thereof. The process then involves converting the first compound in the reaction mixture to provide a first intermediate comprising isoprene. Then, the isoprene in the first intermediate is reacted in the presence of a first heat transfer agent to provide a second intermediate comprising terpenes. Finally, the second intermediate is allowed to react in the presence of a second heat transfer agent, or alternatively in neat conditions, and optionally in presence of a catalyst to provide the sustainable fuel composition. The sustainable aviation fuel composition made available from the process of the invention is found to comprise monocyclic aromatic hydrocarbons (MAHs) at useful concentration ranges (along with cycloalkanes) while they are substantially devoid of Polycyclic aromatic hydrocarbons (PAHs).

The application discloses an esterase with stereoselectivity and application thereof, and the esterase is: a) an esterase comprising a sequence as shown in SEQ ID NO: 2 or a sequence as shown in SEQ ID NO: 2; or b) a mutant based on SEQ ID NO: 2 comprising one or more than two mutations, and the esterase is used as a catalyst in the application of asymmetric resolution preparation of chiral oxacycloalkane carboxylate, has good substrate tolerance, high optical purity (ee s The reaction condition is mild, the environment is friendly, the operation is simple, the industrial amplification is easy, and the esterase has a good industrial application development prospect.

The present invention relates to a method for producing unsubstituted or at least monosubstituted α,ω-dicarboxylic acids or ketocarboxylic acids and unsubstituted or at least monosubstituted cycloalkanones by electrochemically oxidizing unsubstituted or at least monosubstituted mono- or polyunsaturated cycloalkenes and unsubstituted or at least monosubstituted saturated alicyclic hydrocarbons in an electrolytic cell in the presence of inorganic or organic nitrates in a reaction medium in the presence of oxygen.

A liquid crystal composition capable of forming a liquid crystal cured layer with suppressed cissing during formation of a liquid crystal cured layer and excellent alignment properties, a liquid crystal cured layer, an optical film, a polarizing plate, and an image display device. The liquid crystal composition includes a liquid crystal compound and a surfactant, in which the surfactant is a copolymer having a repeating unit A including two or more silicon atom-containing groups each having three substituents and a repeating unit B including two or more ring structures consisting of a cycloalkane ring or a monocyclic aromatic ring in which at least one of the ring structures consists of a monocyclic aromatic ring.

The invention relates to fluorocarbon chain modified cobalt nickel-aluminum hydrotalcite and a preparation method and application thereof, ions in the cobalt nickel-aluminum hydrotalcite are Co < 2 + >, Ni < 2 + > and Al < 3 + > respectively, and a fluorocarbon chain is prepared from at least one compound in formulas (I)-(III); comprising the following steps: S1, stirring and mixing a Co < 2 + > aqueous solution, a Ni < 2 + > aqueous solution, an Al < 3 + > aqueous solution and a urea aqueous solution in an inert gas atmosphere, then carrying out a hydrothermal reaction, and after the reaction is finished, carrying out post-treatment to obtain cobalt nickel-aluminum hydrotalcite; and S2, dispersing the cobalt nickel-aluminum hydrotalcite in anhydrous toluene, reacting the cobalt nickel-aluminum hydrotalcite with at least one compound in formulas (I)-(III) under the action of triethylamine in an inert gas atmosphere, and after the reaction is finished, performing post-treatment to obtain fluorocarbon chain modified cobalt nickel-aluminum hydrotalcite, the hydrotalcite is applied to preparation of naphthenic alcohol and naphthenic ketone by catalyzing partial oxidation of naphthenic hydrocarbon. The method has the advantages of high selectivity, high product yield, low content of naphthenic hydroperoxide in the reaction process, and high operation safety.

The invention belongs to the technical field of aviation fuel, and particularly relates to a C11-C16 cycloalkane component as well as a preparation method, a preparation device and application thereof. The preparation method of the C11-C16 cycloalkane component provided by the invention comprises the following steps: carrying out a hydrodesulfurization and denitrification reaction on a coal tar light fraction and a hydrodesulfurization and denitrification catalyst in a hydrogen-containing atmosphere to obtain refined light oil; carrying out alkylation reaction on the refined light oil, naphtha and a hydrogen type molecular sieve catalyst to obtain an aryl mixture; carrying out hydrogenation reaction on the aryl mixture and a hydrogenation catalyst in a hydrogen-containing atmosphere to obtain a cycloalkane mixture; and the cycloalkane mixture is subjected to fractionation, such that the C11-C16 cycloalkane component is obtained. According to the preparation method provided by the invention, the coal tar light fraction and naphtha are taken as raw materials and can be directionally converted into C11-C16 cycloalkane components, so that the novel aviation fuel with high density and calorific value is prepared.

The invention first relates to a process for the dehydrogenation of a feedstock comprising cycloalkanes having 6 carbon rings to produce an effluent comprising hydrogen and aromatics, using a reaction section comprising at least one multi-tubular reactor comprising at least two tubes comprising a fixed bed of at least one dehydrogenation catalyst and a shell comprising at least one fixed bed of at least one dehydrogenation catalyst, -the feedstock is fed into the tube in gaseous form at an inlet temperature of the feedstock greater than or equal to 300 DEG C, at an inlet pressure of the feedstock between 0.1 and 1 MPa, and at a feedstock weight hourly space velocity (WWH) at an inlet between 1 and 15 h <-1 >,-a heat transfer fluid is circulated in the shell, the heat transfer fluid is introduced in gaseous form at the inlet of the shell, and-the heat transfer fluid is introduced in gaseous form at the inlet of the shell. The heat transfer fluid is introduced into the shell at an inlet temperature of between 320 DEG C and 400 DEG C and at an inlet pressure of between 0.10 MPa and 1.10 MPa at a flow rate such that the ratio of the weight flow rate of the heat transfer fluid at the inlet of the shell to the weight flow rate of the feedstock at the inlet of the tube is greater than or equal to 1.0.