Descaling of jackets of glasslined vessels.

摘要

To descale the inside of the jacket of a glass-lined vessel (e.g., reaction vessel) or conduit, especially of glass-and-metal, there is used a descaling solution of hydrochloric acid, preferably 5 to 15% by wt., containing 50 to 1,000 ppm of laurylamine, lauryldimethylamine or propargyl alcohol, at a temperature of 40 to 70 DEG C., and optionally containing 0.1 to 5% by wt., of tin (II) chloride. The cleaning solution is circulated normally for 2 to 6 hours and drained and the jacket rinsed and neutralised with alkali. Iron oxide scale is thus totally removed, without damage by generation of hydrogen gas and without corrosion.