56results about How to "Shorten the mass transfer distance" patented technology

The invention discloses a hierarchical pore Hbeta molecular sieve catalyst for preparing diphenylamine by condensing aniline. The hierarchical pore Hbeta molecular sieve catalyst is prepared by virtue of a direct synthetic method or a micropore molecular sieve modification indirect synthetic method. The invention also discloses a preparation method of the hierarchical pore Hbeta molecular sieve catalyst as well as an application in preparing diphenylamine by catalyzing the condensation of the aniline. Under the effect of a formed catalyst prepared by the hierarchical pore Hbeta molecular sieve catalyst, the aniline has a self-condensation reaction to prepare diphenylamine, the reaction temperature is 290 to 370 DEG C, the reaction pressure is 1.5MPa to 5MPa, and the airspeed is 0.1 to 0.7 / h. The molecular sieve catalyst has the advantages of good catalytic activity, good stability and high diphenylamine selectivity. Compared with the corresponding ordinary micropore Hbeta molecular sieve, the conversion rate of the aniline is at least increased by 23%, the selectivity of the diphenylamine is at least increased by 1%, and the service life of the catalyst can reach more than 7000 hours.

The invention discloses a filling material for sewage treatment and a preparation method of the filling material. The filling material is spherical and comprises a solid sphere in the centre, a sheet-like fan-shaped expansion area and a wool area on various surfaces, wherein the sheet-like fan-shaped expansion area and the wool area on various surfaces are arranged outside the solid sphere at intervals. The preparation method comprises the steps of manufacturing a spherical basal body, forming a fan-shaped surface in the expansion area, splitting and the like. By means of the unique structure and the process thereof, the filling material disclosed by the invention is good in oxygenizing efficiency and rapid to hang; the specific surface area of the filling material is high; attachment of microorganisms is promoted through the fan-shaped wool area; an aerobic state is formed in the sphere; an anoxic state is formed even in the spherical centre; a biological membrane has multiple varieties of the microorganisms, long food chain and higher processing capacity; the filling material is simple to install and convenient to operate and manage; the basal body shape of the filling material is a sphere; under the stirring of aerated bubbles, the filling material can rotate at high speed; therefore, the filling material is low in resistance and mould releasing and updating are easy; the filling material takes synthetic fibre polyurethane, which has good hydrophilia, as a substrate material.

The present invention provides a reactor capable of realizing stratification and close to real plug-flow conditions and a treatment method thereof. The reactor includes a reactor body filled with a composite biological carrier, and the composite biological carrier is a plurality of Layer structure, the composite biological carrier is provided with layered channels along the flow direction; the composite biological carrier includes at least one layer of main biological carrier and at least one layer of secondary biological carrier, and the porosity of the main biological carrier is higher than that of the secondary biological carrier. By adopting the technical scheme of the present invention, the fluid can reach a real pushing flow state in the biofilm reactor, and the fluid realizes a layered flow system in the narrow flow channel, and the waste water and the biofilm attached to the fixed biological carrier The maximum distance between convective and diffusive mass transfer is drastically reduced, and the overall reactor volume can typically be reduced by 25% compared to conventional systems. Moreover, due to the absence of anti-mixing and short flow, the system runs more stably and has higher processing efficiency.