Process for the manufacture of basic chrome tanning agents soluble in coldwater

A process for the manufacture of a powdered, basic chromium sulfate which is soluble in cold water, said process comprising the step of evaporating an aqueous solution of basic chromium sulfate in the presence of 0.1 to 10% by weight, with reference to the weight of dry chromium salt in the solution, of at least one glycol compound selected from the group consisting of alkylene glycol of 2 to 4 carbon atoms;

• the monomethyl or monoethyl ether of said glycol;
• and higher molecular weight oligomers and polymers of said glycol, adducts thereof with ethylene oxide and/or propylene oxide, or the monomethyl or monoethyl ethers of said oligomers, polymers and adducts, with the proviso that said higher molecular weight compounds have a molecular weight up to about 2,500.