(a) in the presence of Pyridine, with Chlorosulfonic acid treatment C.I. Vat Orange 1 leuco; (b) Metal used in Pyridine(such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate) processing C.I. Vat Orange 1. The above two kinds of circumstances are through with alkali, filter out the insoluble,, remove Pyridineand salting-out.
Properties and Applications
yellow orange. Orange powder. Soluble in water. Under fluorescent light for shallow green yellow. The woven fabric dyeing and printing in the sun, a crisp loss phenomenon, but its degree than C.I. Solubilised Vat Yellow 4 slightly lower. Cotton fiber loss of a fragile phenomenon. Mainly used for the cotton fabric dyeing and printing. Because of its sun and wet process fastness is better,widely used in printing and dyeing cloth washable fabrics and furniture, etc., can direct printing, resist printing or white discharge printing. Also be used for viscose, polyvinyl alcohol, polyester, silk and other fabric dyeing and printing..
