Patent GB-608211-A (GB)
Title: Apparatus for separation and fractionation of substances by treatment of froth
IPC: B03D1/14
Filed: 1946-05-17
Abstract: Apparatus for separation of colloidal sols by froth formation as described and claimed in the parent Specification is modified in that the walls of the tube containing the froths are roughened to increase their wettability.  The roughening may be effected by various means such as, for example, by sand blasting, abrasive powders, hydrofluoric acid or coatings of matt structures, granular or striated.  To enable the different columns of froth to be easily identified, a non-frothing dye or fluorescent substance may be added to the solution being treated.  In separating an amphoteric body, for example, a protein from a mixture containing several frothing bodies, a compound having a coloured cation or anion is added, depending upon whether the pH value of the solution is above or below the iso-electric point of the amphoteric body.  Two examples are given of methods of extraction of gelatin from solutions containing mucin.  In one case a coloured salt containing a cupro-ammoniacal complex ion is added to the solution which has been previously brought to a pH value corresponding to the iso-electric point of gelatin, and the froths are separated by the method and apparatus described in the parent Specification.  In the other case salicylic acid containing a fluorescent anion is added to the solution which has been previously brought to the iso-electric point of gelatin.  The column of froth when illuminated by ultra-violet light is fluorescent.ALSO:Apparatus for separation of substances from solution by froth formation as described and claimed in the parent Specification is modified in that the walls of the tube containing the froths are roughened to increase their wettability.  The roughening may be effected by various means such as, for example, by sandblasting, abrasive powders, hydrofluoric acid or coatings of matt structures, granular or striated.  To enable the different columns of froth to be easily identified a non-frothing dye or fluorescent substance may be added to the solution being treated.  In separating an amphoteric body, for example, a protein from a mixture containing several frothing bodies, a compound having a coloured cation or anion is added, depending upon whether the pH value of the solution is above or below the iso-electric point of the amphoteric body.  Two examples are given of methods of extraction of gelatin from solutions containing mucin.  In one case, a coloured salt containing a cupro-ammoniacal complex ion is added to the solution which has been previously brought to a pH value corresponding to the iso-electric point of gelatin, and the froths are separated by the method and apparatus described in the parent Specification.  In the other case, salicylic acid containing a fluorescent anion is added to the solution which has been previously brought to the iso-electric point of gelatin.ALSO:Apparatus for separation of substances from solution by froth formation as described and claimed in the parent Specification is modified in that the walls of the tube containing the froths are roughened to increase their wettability.  The roughening may be effected by various means such as, for example, by sand blasting, abrasive powders, hydrofluoric acid or coatings of matt structures, granular or striated.  To enable the different columns of froth to be easily identified a non-frothing or fluorescent substance may be added to the solution being treated.  In separating an amphoteric body from a mixture containing several frothing bodies, a compound having a coloured cation or anion is added, depending upon whether the pH value of the solution is above or below the iso-electric point of the amphoteric body.  The separation of rhodamine from methylene blue is mentioned.ALSO:Apparatus for separation of substances from solution by froth formation as described and claimed in the parent Specification is modified in that the walls of the tube containing the froths are roughened to increase their wettability.  The roughening may be effected by various means such as, for example, by sand blasting, abrasive powders, hydrofluoric acid or coatings of matt structures, granular or striated.  To enable the different columns of froth to be easily identified a non-frothing dye or fluorescent substance may be added to the solution being treated. In separating an amphoteric body, for example, a protein from a mixture containing several frothing bodies, a compound having a coloured cation or anion is added, depending upon whether the pH value of the solution is above or below the iso-electric point of the amphoteric body.  Two examples are given of methods of extraction of gelatin from solutions containing mucin.  In one case a coloured salt containing a cupro-ammoniacal complex ion is added to the solution which has been previously brought to a pH value corresponding to the iso-electric point of gelatin, and the froths are separated by the method and apparatus described in the parent Specification.  In the other case salicylic acid containing a fluorescent anion is added to the solution which has been previously brought to the iso-electric point of gelatin.  The column of froth when illuminated by ultra violet light is fluorescent.