6results about How to "Reduce sintering" patented technology

This application discloses a calcium-based carbon dioxide adsorbent, its preparation method, and its application, relating to the field of adsorbent technology. The preparation method of the calcium-based carbon dioxide adsorbent includes the following steps: obtaining calcium hydroxide, an unsaturated organic compound, magnesium oxide, and aluminum oxide; mixing the calcium hydroxide, unsaturated organic compound, magnesium oxide, and aluminum oxide and adding them to a solvent; heating and stirring to obtain a mixed suspension, wherein the unsaturated organic compound is an organic acid or an organic aldehyde; drying the mixed suspension to obtain a dried powder; subjecting the dried powder to medium-temperature combustion to obtain a calcium-based carbon dioxide adsorbent precursor, wherein the medium-temperature combustion temperature is 400–600°C; and subjecting the calcium-based carbon dioxide adsorbent precursor to a first high-temperature calcination to obtain the calcium-based carbon dioxide adsorbent, wherein the first high-temperature calcination temperature is 700–1000°C. This application solves the technical problem of poor adsorption performance of existing calcium-based carbon dioxide adsorbents.

The application discloses a regeneration method of deactivated residual oil hydroprocessing catalyst. The method comprises the following steps: deoiling and decarburization treatment of the deactivated residual oil hydroprocessing catalyst, ultrasonic cleaning of the catalyst by using a non-ionic surfactant, mixing of the catalyst with a binary system solution containing an organic acid and an oxidant, hydrothermal treatment of the mixture, impregnation of the mixture by using an impregnation solution containing a polyacid and a dihydric alcohol, and calcination of the impregnated mixture to obtain the regenerated hydroprocessing catalyst. The method can effectively leach poisoning substances such as V, Ni and Fe in the deactivated catalyst, maximally reduce the loss of catalytic active components, restore the pore structure of the waste catalyst, expose the active centers, and has the characteristics that the catalyst has a high initial sulfuration degree and high catalytic activity when applied to the residual oil hydrogenation reaction after the regeneration treatment.

The utility model belongs to the technical field of carbon dioxide hydro-conversion, particularly relates to a membrane reactor for a reaction-separation coupling process, and aims to solve the problem of performance failure of the membrane reactor in a high-temperature environment in the background technology, the following scheme is provided: the membrane reactor comprises a reaction tube body, end covers are screwed on the outer walls of two ends of the reaction tube body, and the end covers are screwed on the outer walls of two ends of the reaction tube body; a product gas outlet is welded to one end of the outer wall of the bottom of the reaction tube body, a feed gas inlet is welded to the other end of the outer wall of the top of the reaction tube body, and a purge gas outlet is welded to the outer wall of one side of one end cover. The NaA molecular sieve membrane loaded by the ceramic hollow fiber carrier is adopted, a compact and defect-free zeolite membrane layer is formed through a multi-time in-situ growth process, the membrane can still keep a stable hydrophilic nano channel (the aperture is 0.4 nm) at the temperature of 300-400 DEG C and the high pressure of 4 MPa, water molecules are preferentially adsorbed and permeated, the thermodynamic equilibrium limitation is effectively broken, and compared with a traditional molecular sieve membrane, the membrane has the advantages that the membrane is simple in structure and convenient to use, and the cost is low. The thermal stability is obviously improved.

The present application relates to a kind of boron stainless steel sheet for thermal neutron absorption preparation method, comprising the following process steps: (1) induction melting; (2) atomization and deposition; (3) forging; (4) hot rolling; (5) profile processing.The present application is through innovative process route, reasonable melting, plate processing deformation and heat treatment process, significantly improve the microstructure of material, refine hard and brittle boride particles, and then improve the hot workability of material and the mechanical properties of finished plate, meet the higher requirements of boron stainless steel sheet for thermal neutron absorption.According to the process manufactured by the present application, the performance of the plate is similar to powder metallurgy boron stainless steel, also has excellent comprehensive performance, and the process flow is shorter, and the manufacturing cost is also lower.

This invention provides a method for hydrogen-deuterium substitution in heterocyclic aromatic hydrocarbons using a binary, inexpensive metal catalyst, belonging to the field of organic synthesis technology. The method uses heterocyclic aromatic hydrocarbons as raw materials, adding heavy water and a binary, inexpensive metal catalyst with or without solvent. Under inert gas protection, the hydrogen-deuterium substitution reaction is carried out at elevated temperature. After the reaction, the product is separated and purified to obtain the deuterated heterocyclic aromatic hydrocarbon compound. The preparation method provided by this invention uses inexpensive heavy water as the deuterium source and an inexpensive binary metal as the catalyst, resulting in low cost, high operability, wide applicability, and high deuteration rate. It achieves a low-cost and efficient deuteration technology for heterocyclic aromatic hydrocarbons, overcoming the limitations of current heterocyclic aromatic hydrocarbon deuteration technologies.

The application belongs to the technical field of catalysts, and provides a catalyst for preparing DMT monomers through PET methanolysis, and a preparation method and application thereof. x The Nb3In / NbO-Al2O3 catalyst is prepared by co-precipitation of a mixed metal salt solution composed of niobium salt, indium salt and aluminum salt in the presence of a precipitant to obtain an Nb / In / Al-LDH precursor, and then reduction under the action of hydrogen to obtain the Nb3In / NbO-Al2O3 catalyst. x The Nb3In / NbO-Al2O3 catalyst is prepared by co-precipitation of a mixed metal salt solution composed of niobium salt, indium salt and aluminum salt in the presence of a precipitant to obtain an Nb / In / Al-LDH precursor, and then reduction under the action of hydrogen to obtain the Nb3In / NbO-Al2O3 catalyst. The catalyst can realize a DMT yield of >99% in the reaction of preparing DMT monomers through PET methanolysis under normal pressure conditions, can be recycled for multiple times, has good structural stability and repeated use performance, and has good potential for scale-up preparation and molding application.