A PROCESS FOR THE MANUFACTURE OF SELF BASIFYING BASIC CHROMIUM SULPHATE FOR LEATHER TANNING

摘要

A process for the manufacture of self basifying basic chromium sulphate such as herein described comprising mixing 1.118 g. moles of sodium trichromate, 4.34 g. moles of sulphuric acid and 0.55 g. moles of sodium sulphate, adding gradually to the said mixture 0.41 g. moles of molasses, maintaining the reaction mixture at a temperature ranging from 98°C to 102°C to complete the reduction of hexavalent chromium to trivalent chromium adding a mixture of 0.28 g. moles of sodium sulphate and 0.29 g. moles of sodium formate in the aqueous solution, agitating the resulting mixture and spray drying the product till the moisture content is 8 to 8%.