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Stabilized dithionite solutions
| Details |
Inventors: Ellis, Leonard C.; Little, Edwin D.;
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Guar and xanthan gums are used as additives to sodium dithionite aqueous solutions for enhancing the stability of such solutions when in contact with air and used for vat dyeing of textiles and bleaching. The gums are added at levels of 0.1-0.2% by wt. and preferably at 0.15% by wt. of the solution. The stability of these polymeric-containing bleaching solutions is enhanced by more than 100-200%. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A sodium dithionite solution having enhanced stability when in contact with air, comprising guar gum as a polymeric additive.
2.
The solution of claim 1, wherein said guar gum is present in said solution within the range of 0.
1-0.
2% by wt.
3.
The solution of claim 2, wherein said guar gum is present in said solution at 0.
15% by weight.
4.
The process of protecting a sodium dithionite solution used in vat dyeing of textiles and bleaching, conprising the addition of guar gum as a stabilizer therefor.
5.
The process of claim 4, wherein said guar gum is added at a level of 0.
15% by wt.
6.
The process of claim 5, wherein said solution is at an initial pH of 12-14 and an initial temperature of 40.
degree.
-55.
degree.
F.
Description:
BACKDGROUND OF THE INVENTION 1.
Field of the Invention This invention relates to dithionite solutions used in the bleaching and vat dyeing of textiles and especially relates to stabilizing sodium dithionite solutions.
It particularly relates to enhancing the stability of sodium dithionite solutions during storage by adding selected suspending agents thereto.
2.
Review of the Prior Art Aqueous dissolved mixtures of sodium dithionite and sodium sulfite are employed in the bleaching of textiles, but these solutions are subject to decomposition during storage.
To prevent extensive decomposition, it is customary to control the storage temperature and the pH of the solution.
The stability of sodium dithionite solutions in air has been tested by adding various preservatives, as reported in Chimie et Industrie, March 1932, pages 527-533, by A.
Seyewetz and P.
Kalmar.
They found that the most effective preservatives for retaining the reducing power of sodium dithionite solutions at 3% concentration and at ordinary temperatures were the following alkaline substances or substances with subsequent alkaline reactions, listed in decreasing order of efficiency: tribasic sodium phosphate, sodium silicate, potassium carbonate, sodium carbonate, pyrogallic acid, ammonium sulfocyanide, ammonia, sodium sulfide, and methylamine
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