Abstract: A novel suspension of boric acid comprising a concentrated, finely dispersed suspension of boric acid and a small amount of a soluble borate salt in an aqueous medium and a method of preparing the same.
Type:
Grant
Filed:
September 11, 1987
Date of Patent:
January 31, 1989
Assignee:
Rutgerswerke AG
Inventors:
Wolf Dietrich, Volker Beez, Eberhard Giebeler
Abstract: The present invention relates to a process for the preparation of zinc 2-mercaptopyridine-N-oxide in a readily filterable, washable and easily suspendable form which comprises reacting an aqueous solution of an alkali metal salt of 2-mercaptopyridine-N-oxide with an aqueous solution of a water soluble zinc salt at a temperature of 35.degree. to 100.degree. C. in the presence of an at least partially water soluble organic solvent to form a precipitate of zinc 2-mercaptopyridine-N-oxide, recovering the said crystals and optionally comminuting the crystals.
Type:
Grant
Filed:
January 25, 1985
Date of Patent:
December 30, 1986
Assignee:
Rutgerswerke AG
Inventors:
Manfred Maurer, Winifried Orth, Werner Fickert
Abstract: A novel process for the preparation of aryl esters of organic carboxylic acids in high isomer purity by decomposing a compound of the formula ##STR1## wherein Ar is an aryl radical, X is an acyloxy of an organic carboxylic acid and Y is selected from the group consisting of an acyloxy of an organic carboxylic acid and an anion of a strong organic and mineral acid in an aqueous media in the presence of a palladium salt or in the form of a two-phase reaction, wherein the aryl thallium salt is dissolved in water and the catalytic palladium salt is dissolved in a water-immiscible organic solvent and the reaction takes place with mixing.