US 4,622,152 A · Combined mixing, reacting, drying and filtering device

Abstract

A single apparatus including a mixing vessel and mixing means for achieving a slurry of material introduced within the vessel. A filter is mounted within the vessel in the region of the material being mixed so as to be contacted by the slurry created. The filter is mounted within the vessel in such manner as to efficiently filter, efficiently separate particles from liquid, without interfering or hindering the proper mix action. Mixing, reacting, washing, filtering, vacuum or purge drying, and particle sizing of powdered or granular materials stemming from the slurry, for the process industry, is achieved by reason of the incorporation of the filter within the mixing chamber of a positive-action mixer as described. The successive processing steps of mixing, reacting, washing, filtering, vacuum or purge drying, including the forming of a layer of matter on the filter, coupled with devices by which the layer may be periodically removed and any skin formed thereon also removed, and processing to powdered or granular materials from an initial dry batch or slurry, are accomplished in a single processing vessel without discharging the batch until the entire processing sequence is completed. The mixer, filter arrangement is particularly well suited for use in organic chemical synthesis.

Claims19

Dependent claims

In a mixing, reacting process including the steps of creating a liquid-solids slurry batch of material in a mixing, reacting chamber and subjecting said slurry batch to a positive mix action in said chamber by means of a positive-action mixing element, the improvement which includes the steps of:

continuously presenting said liquid-solids slurry batch to a filter device located in said chamber as the viscosity of said slurry batch increases due to increasing particle or solids concentration, the filter device being proximally located with respect to the positive-action mixing element;
continuously filtering liquid from said liquid-solids slurry batch and accumulating such liquid in said chamber device while said slurry batch is subjected to said positive mix action in said chamber;
periodically removing solids which accumulate on said filter device while said solids remain in said chamber;
removing any skin which forms on said solids by the mechanical mixing action of the slurry on the filter device while said solids remain in said chamber;
withdrawing liquid accumulating in said filter device;
and ensuring that the successive processing steps of mixing, reacting, filtering and drying said liquid-solids slurry batch are completed in said chamber without discharging said slurry batch from said chamber;
whereby said liquid-solids slurry batch is reduced to a friable particulate condition while still in said chamber.

4 more elements

Dependencies are inferred from the claim text.

Combined mixing, reacting, drying and filtering device

Life of this patent

Combined mixing, reacting, drying and filtering device

Life of this patent

Abstract

Claims19