Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including internal mixing or stirring means
Patent
1996-03-19
1998-04-21
Bhat, Nina
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Including internal mixing or stirring means
261 792, 261DIG72, B01J 1924, B01F 500
Patent
active
057414661
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a multiphase staged passive reactor for promoting interphasic interaction of a first substance in a liquid phase with a second substance in a non-miscible liquid phase, a solid phase or a gaseous phase. BACKGROUND TO THE INVENTION
There are many industrial and commercial processes which require thorough mixing and/or dissolution of two or more phases, for example, aeration of a slurry to promote froth generation in a flotation process. Other applications which require the dissolution of a solid phase and/or gaseous phase in a liquid phase include fractional oxidation, pH control of alkali/acid solutions and/or slurries, leaching, ionic exchange processes, base metal leaching and gas scrubbing, heat exchange processes and solvent extraction.
The present invention was developed with a view to providing a multiphase staged passive reactor and method for promoting interphasic interaction between two or more such substances in different phases. Throughout the present specification the term "interphasic interaction" is employed to describe any interaction between two or more phases, including mechanical interaction due to, for example, collisions, shearing, friction, compression, extrusion and energy transfer, as well as chemical reactions due to, for example, oxidation, reduction, saturation, ion-exchange and dissolution, and where the phases that interact are characterised by different relative densities.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided a multiphase staged passive reactor for producing interphasic interaction of a first substance in a liquid phase with a second substance in a non-miscible liquid phase, a solid phase or a gaseous phase, at least one stage having only two facing surfaces defining the flow path, and wherein the phases of said first and second substances respectively are characterised by different relative densities, the reactor comprising: substances, each stage being shaped to define a substantially curved flow path having a centre of curvature located to one side of the flow path, and wherein adjacent stages have a respective centre of curvature on opposite sides of the flow path whereby, in use, as the substances flow through the reactor particles of the second substance are forced to migrate through the first substance, first in one direction and then in substantially the reverse direction to promote interphasic interaction.
The curvature at a point on a plane curve measures the rate of change (at the point) in an angle which the tangent makes with a fixed axis, relative to an arc length of the curve. The curvature is the reciprocal of the radius of curvature, which is the radius of a circle which touches the curve (on the concave side) at the point in question. The circle is the circle of curvature, and its centre is the centre of curvature of the curve at that point. Therefore, unless the curve follows the circumference of the circle of curvature, the centre of curvature will change at different points along the curve. Hence, the centres of curvature of the flow path located to one side may define a locus of centres of curvature. It is to be understood that the reference to the substantially curved flow path having "a centre of curvature located to one side of the flow path" is intended to mean at least one centre of curvature located to one side of the flow path, as there may be more than one centre of curvature for the substantially curved flow path defined by each stage of the reactor.
Typically the flow path defined by each stage is of substantially similar shape, unless otherwise required by the process.
Preferably each stage is shaped to define a smoothly curved flow path wherein turbulent eddies in the flow path of the substances are substantially eliminated or at least minimised. Obviously dissolution of more than one substance of a different phase, with the first substance in a liquid phase can be performed by the reactor, for example, the dissolution of a second
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Atomaer Pty Ltd
Bhat Nina
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