(a) in the presence of Pyridine , with Chlorosulfonic acid treatment C.I. Vat Orange 5 leuco ; (b) used in Pyridine metal (such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate) processing C.I. Vat Orange 5. The above two kinds of circumstances are through with alkali, filter out the insoluble,, remove Pyridine and salting-out.
Properties and Applications
red light orange. Orange powder. Soluble in water. Meet strong sulfuric acid into purple. Can be used for the cotton fabric dyeing, red light for orange. Can also be used to the cotton fabric dye printing, the white printing, also can be used for silk and wool dyeing.
