Abstract:
A method for producing de-colored shellac by dissolving colored shellac in an aqueous solution comprising an alkaline agent; contacting the colored shellac in the aqueous solution with a sufficient amount of a chlorite salt to achieve de-coloration of the shellac; precipitating the de-colored shellac by neutralizing the aqueous solution with an acid; and recovering the precipitated de-colored shellac from said aqueous solution. The de-colored shellac produced is non-toxic and suitable for human use. Dental compositions comprising the de-colored shellac are disclosed, as well as uses of the de-colored shellac as a food product coating, a nail polish or varnish, and a wood varnish.
Abstract:
A method for producing de-colored shellac by dissolving colored shellac in an aqueous solution comprising an alkaline agent; contacting the colored shellac in the aqueous solution with a sufficient amount of a chlorite salt to achieve de-coloration of the shellac; precipitating the de-colored shellac by neutralizing the aqueous solution with an acid; and recovering the precipitated de-colored shellac from said aqueous solution. The de-colored shellac produced is non-toxic and suitable for human use. Dental compositions comprising the de-colored shellac are disclosed, as well as uses of the de-colored shellac as a food product coating, a nail polish or varnish, and a wood varnish.
Abstract:
A process for extracting rubber and/or resin from rubber containing plants such as guayule utilizing a monophase mixture of an organic polar solvent and a hydrocarbon solvent.
Abstract:
A CONTINUOUS PROCESS FOR THE EXTRACTION FROM RESINCONTAINING COAL, OF SUBSTANTIALLY ALL OF THE CONTAINED RESIN. THE PROCESS PROVIDES FOR SUBJECTING RESIN-CONTAINING COAL FINES TO A INTEGRATED SOLVENT-EXTRACTION AND SOLUTION-SEPARATION PROCEDURE FOR OBTAINING BOTH A FIRST QUANITY OF RESIN SOLUTION CONTAINING A MAJOR PORTION OF THE RESIN, AND A MIXTURE OF COAL FINES AND SOLUTION CONTAINING SUBSTANTIALLY ALL OF THE REMAINING PORTION OF THE RESIN; SUBJECTING THE MIXTURE TO A SERIES OF INTEGRATED SOLVENT-DILUTION AND SOLUTION-SEPARATION PROCEDURES FOR OBTAINING BOTH A SECOND OF RESIN SOLUTION CONTAINING SUBSTANTIALLY ALL OF THE REMAINING PORTION OF THE RESIN AND A RESIDUAL MIXTURE OF COAL FINES AND SOLVENT, RECOVERING SUBSTANTIALLY ALL OF THE RESIN CONTAINED IN THE FIRST AND SECOND QUANTIES OF SOLUTION; AND RECOVERING SUBSTANTIALLY ALL OF THE SOLVENT EMPLOYED.