摘要:
The present disclosure provides processes and apparatus for the production of materials requiring a plurality of chemical reaction steps. In the prior art the number of reaction vessels is minimized by performing two or more reactions together in the same vessel. Instead each process is separated into separate successive steps, in each of which at least two principal components are reacted together, with or without at least one catalyst. In each step the components are reacted under optimum condition for that reaction, using motion-augmented, sub-Kolmogoroff, micro-agitation provided by a separate discrete motor-operated, micro-agitation means. Such means are much smaller in size, but are extremely flexible as to the flow rate and reaction conditions, so that they can be adjusted to suit the reaction, without compromises dictated by attempting to perform other reactions in the same vessel. Multiple micro-agitation means in parallel or in series can be used in each step to increase capacity without scale-up problems, and units can be serviced or capacity reduced without the need to close down the process. Motor-operated micro-agitation means performing a non-chemical action can be provided at any stage of the process. Between each two steps the resultant mixture is separated to give a principal component used in the subsequent step, while at least one new principal component is added in the next step.
摘要:
A reactor produces a gas-in-liquid emulsion for providing increased interfacial contact area between the liquid and the gas for improved reaction of the gas with the liquid, or more rapid solution or reaction of a difficulty to dissolve or immiscible gas in or with a liquid. The reactor is suitable for a continuous or batch type process. Rotor and stator cylindrical members are mounted for relative rotation one to the other and have opposing surfaces spaced to form an annular processing passage. The gap distance between the opposing surfaces and the relative rotation rate of the cylindrical members are such as to cause formation of a gas-in-liquid emulsion of the gas in the liquid, as the liquid and gas pass through the processing passage.
摘要:
Highly filled composite materials, e.g. comprising approximately 60 volume % or greater of finely powdered particles of filler in a polymer matrix, are made by dissolving polymer in a volatilisable solvent, adding filler and forming a homogeneous mixture by high shear mixing. Most solvent is then removed while maintaining homogeneity in the mixture, preferably by evaporation in a high shear mill. Then, extruding a thin layer of the composite material and removing remaining solvent, as by heating. Bodies are formed from the dried layer, which are heated and pressed to melt and disperse melted polymer into the interstices between filler particles. Thereby, certain polymers unusable at low solids contents become effective bonding materials at high solids contents. Filler materials are chosen to tailor electrical and physical properties of the articles, which may comprise substrates for electronic circuits. Suitable polymers are certain polyarylene ethers soluble in cyclohexanone.
摘要:
Shell and tube heat transfer apparatus and a corresponding process of heat transfer employ a fluid flow consisting of non-turbulent boundary-layers adjacent the inner and outer heat exchanger surfaces of the tubes and a non-turbulent core-layer between the boundary-layers and interfacing therewith. Interrupter-structures disposed within the tube and shell flow passes and interrupt the full development of the boundary-layers at a multitude of spaced spots, leaving the heat transfer surfaces unaltered, unmodified and uninterrupted, so that the boundary-layers cannot increase in thickness but will partially separate from the surfaces and mix non-turbulently with the core-layer to effect the required heat transfer between the surfaces and the fluid. The interrupter-structure preferably consists of a plurality of rows of spheres, with which the space remote from the heat exchange surface is filled with a space-filling material to prevent the useless flow of fluid in a space not effective for heat transfer. The interrupter structure may also comprise a unitary body of equivalent shape.
摘要:
The heat exchange apparatus provides a flow passage for the heat exchange fluid comprising a succession of flow passage chamber portions separated from one another by intervening throttle forming passage portions of smaller cross section, and therefore of smaller flow capacity, transverse to the flow direction, so that the heat exchange fluid moves at a higher velocity in the throttle forming portions than in the chamber portions. The fluid is moved at a rate such that its velocity in the throttle forming portions is high enough to reduce the thickness of the fluid boundary layer on the passage wall and thereby facilitate the heat exchange. Alternatively, or in addition, the velocity is high enough to at least reduce the rate of fouling of the passage wall surface. Alternatively, or in addition, the fluid flows as eddy vortices, the spacing of the chamber portions along the passage being such that wake interference flow is established which enhances the rate of heat exchange. The exchanger is intended principally for use in combination with a spinning tube in tube reactor with a very small annular cross section reaction passage between them, the exchanger also being of tubular form with the stator tube constituting a wall of the heat exchanger.
摘要:
The invention provides processes and apparatus for the production of materials requiring a plurality of chemical reaction steps. In the prior art the number of reaction vessels is minimized by performing two or more reactions together in the same vessel. Instead each process is separated into separate successive steps, in each of which at least two principal components are reacted together, with or without at least one catalyst. In each step the components are reacted under optimum conditions for that reaction, using motion-augmented, sub-Kolmogoroff, micro-agitation provided by a separate discrete motor-operated, micro-agitation means. Such means are much smaller in size, but are extremely flexible as to the flow rate and reaction conditions, so that they can be adjusted to suit the reaction, without compromises dictated by attempting to perform other reactions in the same vessel. Multiple micro-agitation means in parallel and/or in series can be used in each step to increase capacity without scale-up problems, and units can be serviced or capacity reduced without the need to close down the process. Motor-operated micro-agitation means performing a non-chemical action can be provided at any stage of the process. Between each two steps the resultant mixture is separated to give a principal component used in the subsequent step, while at least one new principal component is added in the next step. The materials to be produced preferably comprise organic di-carboxylic acids, and more preferably dimethyl terephthalate and terephthalic acid.
摘要:
A reactor produces a gas-in-liquid emulsion for providing increased interfacial contact area between the liquid and the gas for improved reaction of the gas with the liquid, or more rapid solution or reaction of a difficulty soluble or immiscible gas in or with a liquid. The reactor is suitable for a continuous or batch type process. Rotor and stator cylindrical members are mounted for rotation relative to one another and have opposing surfaces spaced to form an annular processing passage. The gap distance between the opposing surfaces and the relative rotation rate of the cylindrical members are such as to form a gas-in-liquid emulsion of the gas in the liquid. The liquid and gas pass through the processing passage, changing into the gas-in-liquid emulsion.
摘要:
The invention provides fluid handling apparatus which may be heat exchange apparatus or fluid reaction apparatus. The apparatus is provided with an interrupter structure for disrupting the fluid boundary layers at the walls of the apparatus and promoting mixing of the separated boundary layers with the adjacent core layers. One interrupter structure comprises a plurality of longitudinally-spaced interrupter elements mounted on a core rod, each element comprising a plurality of blade-like members each of at least approximately spherical segment profile in side elevation, the members extending mutually radially outward relative to one another to touch or nearly touch the said surface or surfaces adjacent the elements. The elements are spaced longitudinally from one another the distance required to provide wake intererence flow of the fluid, wherein the vortex upstream of one element cooperates with the vortex downstream of the next element in the fluid path. In a shell and tube type exchanger the bladed type of structure may be provided in the tubes interiors, while a spherical type of interrupter structure is provided in the shell contacting the tube exteriors.
摘要:
Apparatus for the treatment of materials by the application thereto of ultrasonic longitudinal pressure oscillations, for example, for dispersing or emulsifying or dissolving or mixing or deagglomerating consists of an enclosure having an interior with two closely-spaced walls at least one of which is made to oscillate at ultrasonic frequencies, or otherwise impart such oscillations to the interior, for example, by ultrasonic transducers mounted on the wall exterior. The spacing between the walls is such that the longitudinal pressure oscillations produced at the oscillating wall are reflected by the other wall, preferably several times, before they are attenuated to a negligible value. Preferably, the other wall also vibrates to produce doppler effects and avoid standing waves. The distance between the inner surfaces of the two walls is normally not more than about 1 inch (2.5 cm). The material to be treated preferably is fed to the enclosure interior under pressure from a storage container and is recirculated until the operation is complete. The invention also comprises processes for the treatment of materials using such oscillations.
摘要:
A spinning tube in tube reactor has the usual elongated transverse annular cross section reaction passage through which reactants pass to force reaction between them; the passage being between the rotor tube exterior surface and the stator tube interior surface. The radial dimension of the annual passage should be keep as uniform as possible so as not to cause unwanted variations in the reaction. This has proven difficult in prior constructions owing to the small radial dimension (e.g. 50-300 micrometers) and inevitable manufacturing tolerances in the bearings supporting the rotor. In apparatus of the invention the rotor is suspended within the stator passage by a flexible connection between the drive motor shaft and the rotor and uniformity is maintained by the so-called hydrodynamic effect which will become operative in such a narrow passage. Thus, if any part of the rotor surface moves radially from the central position closer to the stator surface the liquid viscosity produces a force that moves the rotor back to the central position. Preferably the flexible connection consists of two serially connected flexible connectors.