Process for the purification of greasy and soiled water using a heavy solvent, and apparatus for its implementation
AssigneePeignage Amedee
InventorBernard J. O. Leman
Life of this patent
Estimating the term…
Abstract
A process for the purification of waste water containing grease and soil, especially the effluent from wool-soaking and wool-washing, which comprises mixing the waste water with a heavy solvent; separating the emulsion formed to obtain degreased water, a small quantity of water-solvent emulsion, and solvent charged with greasy matter and soil; clarifying this solvent to separate the soil; subjecting the clarified solvent to an azeotropic distillation in the presence of water, to form an emulsion from which the greasy matter can be recovered, and a head product from which the solvent can be regenerated, and apparatus therefor.
Claims13
A process for purifying waste water containing grease and soil which comprises:
- mixing waste water containing greasy matter and soil with a heavy solvent in a mixing device in a solvent to water ratio of 1 part solvent to 3 to 8 parts water to form an emulsion;
- centrifuging the emulsion to obtain degreased water, a small quantity of water-solvent emulsion and solvent containing greasy matter and soil;
- separating the soil from the solvent containing greasy matter and drying the soil;
- azeotropically distilling the solvent containing greasy matter in the presence of water to recover pure solvent as the head product and a tail product containing greasy matter;
- and
- centrifuging the tail product to isolate the greasy matter.
A process for purifying waste water containing grease and soil which comprises:
- (A) mixing wool-soaking water containing greasy material and soil with a heavy solvent in a mixing device in a solvent to water ratio of 1 part solvent to 3 to 8 parts water to form an emulsion;
- centrifuging the emulsion to obtain degreased water, a small quantity of water-solvent emulsion, and solvent containing greasy matter and soil;
- evaporating the degreased water to recover suint;
- separating the soil from the solvent containing greasy matter to give a first solvent body containing greasy matter and drying the soil;
- (B) mixing wool-washing water containing greasy matter with a heavy solvent in a mixing device in a solvent to water ratio of 1 part solvent to 3 to 8 parts water to form an emulsion;
- centrifuging the emulsion to obtain degreased water, a small quantity of water-solvent emulsion, and solvent containing greasy matter and soil;
- separating the soil and the solvent containing greasy matter to give a second solvent body containing greasy matter;
- (C) combining the first and second solvent bodies containing greasy matter from (A) and (B) and clarifying the resulting mixture;
- subjecting the resulting clarified solvent mixture containing grease to an azeotropic distillation in the presence of water to recover pure solvent as the head product and a tail product containing greasy matter;
- and
- centrifuging the tail product to obtain wool grease.
Apparatus for purifying waste water containing grease and soil which comprises
- (i) a multi-action evaporator, an emulsifier, a disc centrifuge, another multi-action evaporator and a storage means for the suint, connected in that sequence;
- (ii) an emulsifier, a disc centrifuge, a clarifier, a distillation tower, a Florentine separator and a device for storing and recycling the solvent, connected in that sequence, the clarifier also being connected to the disc centrifuge mentioned under (i);
- (iii) a centrifuging separator and a storage means for the greasy matter, connected in that sequence to the distillation tower mentioned under (ii);
- and
- (iv) a device, connected to the clarifier, for drying and storing the soil separated from the anhydrous solvent in the clarifier.
Dependencies are inferred from the claim text.