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US 4,069,154 AGranted
Vacuum filtration process employing a circular vacuum box
AssigneeRhone-Poulenc Industries
InventorMichel Barloy
Life of this patent
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AssigneeRhone-Poulenc Industries
InventorMichel Barloy
Estimating the term…
A process which enables a mixture of liquid and gas, coming from a rotary vacuum filter, to be collected and simultaneously separated. The mixture of gas and liquid is passed from the filter into a vacuum box provided with a space which rotates around the axis of the filter and is generally of circular shape, in which the liquid and gas separate, the liquid is introduced into a lower fixed space generally in the shape of a circular channel, and the gas is introduced into an upper fixed space generally in the form of a circular channel, so that the liquid and gas are collected separately. The process and the apparatus of the invention are advantageously employed in circular table filters divided into filtration zones and provided with wash means, especially in the manufacture of phosphoric acid by the wet method.
A process enabling a mixture of liquid and gas coming from a rotary vacuum filter which is divided into a number of filtration zones for separation of the filtrate to be collected and simultaneously separated, comprising passing the liquid/gas mixture into a vacuum box provided with a generally circular space which rotates about the axis of the filter, and in which the liquid and gas separate, draining the separated liquid via at least one lower opening into a lower fixed space while the separated gas rises via at least one upper opening into an upper fixed space so that the liquid and the gas are collected separately, the moving rotating space being connected to the two adjacent fixed spaces in a liquid-tight and gas-tight manner, the lower fixed space of the vacuum box being divided radially into the same number of compartments as the filtration zone and which includes the step of communicating each compartment with a filtration zone so that each filtrate is separate from the gas.
In combination with a horizontally disposed rotary filter, a first middle part mounted for rotational movement about the vertical rotational axis of the filter and including inlets for receiving the liquid and gas from the filter, each inlet communicating with a vertical coupling open at the top and bottom, a rigid ring joining the lower and upper ends of the couplings in sealing relation, a second fixed lower part consisting of a circular channel on which the moving middle part is supported for relative rotational movement with the open bottom ends of the couplings in communication therewith for receiving the liquid, and a third fixed upper part consisting of a circular channel resting on the upper sealing joint of the moving part with the open top ends of the couplings in communication therewith for receiving the gas, vertically extending radial partitions dividing the lower fixed part into compartments, in which at least one of the partitions is a partial partition so that adjacent compartments communicate for overflow of liquid from one of said compartments to the other.
Dependencies are inferred from the claim text.