Claims
- 1. A method for improving the color stability of glycoside products comprising: treating said glycoside product by contacting the glycoside product with a color stabilizing amount of from about 0.01 to about 2 weight percent, on a glycoside product dry weight basis, of a borohydride material selected from the group consisting of Group I or Group II metal borohydride salts for a time period sufficient to substantially reduce the propensity of said glycoside product to darken upon exposure to elevated temperatures under alkaline conditions.
- 2. The method of claim 1 wherein the borohydride treatment is conducted by intimately admixing said borohydride material into an aqueous solution of said glycoside product.
- 3. The metod of claim 2 wherein the aqueous glycoside solution contains from about 10 to about 90 weight percent of said glycoside product on a total solution weight basis.
- 4. The method of claim 3 wherein the borohydride treatment is conducted at a temperature in the range of from about 20.degree. to about 75.degree. C.
- 5. The method of claim 4 wherein the borohydride treatment is conducted at a pH of about 8 or above.
- 6. The method of claim 5 wherein the borohydride treatment is conducted over a time period of from about 1 to about 100 hours.
- 7. The method of claim 6 wherein the borohydride treatment is terminated by reducing the pH of the aqueous glycoside solution to a value of less than 8.
- 8. The method of claim 2 wherein from about 0.5 to about 20 weight percent, on an aqueous glycoside solution weight basis, of ethanol is added to the aqueous glycoside solution during or following the borohydride treatment.
- 9. The method of claim 2 wherein the aqueous glycoside solution is subjected to an oxidative bleaching operation prior to the borohydride treatment by contacting same with from about 0.05 to about 1.5 weight percent, on a glycoside product dry weight basis, of an oxidative bleaching agent selected from the group consisting of oxygen, ozone, hydrogen peroxide, hypochlorite salts, chlorine dioxide, percarbonates, persulfates, perborates and peracetates.
- 10. The method of claim 2 wherein the aqueous glycoside solution is decolorized by contacting same with a porous, particulate carbon adsorbent prior to the borohydride treatment.
- 11. The method of claim 9 wherein the aqueous glycoside solution is decolorized by contacting same with a porous, particulate carbon adsorbent prior to the oxidative bleaching operation.
- 12. The method of claim 1 wherein the borohydride material is an alkali metal borohydride.
- 13. The method of claim 1 wherein the glycoside product is a glycoside surfactant.
- 14. The method of claim 13 wherein the glycoside surfactant corresponds to the formula:
- RO(R'O).sub.y (Z).sub.x ( A)
- wherein R is a monovalent organic radical containing from about 6 to about 30 carbon atoms; R' is a divalent hydrocarbon radical containing from 2 to about 4 carbon atoms; y is a number having an average value of from 0 to about 12; Z represents a moiety derived from a reducing saccharide containing 5 or 6 carbon atoms; and x is a number having an average value from 1 to about 6.
- 15. The method of claim 14 wherein, in the glycoside surfactant of the formula A, R is an alkyl or alkenyl group containing from about 8 to about 16 carbon atoms; y is zero; and x has an average value of from 1 to about 3.
- 16. The method of claim 1 wherein the treated glycoside product has an extinction coefficient which is (a) about 0.25 or less as initially prepared when determined at a pH of about 7; (b) about 0.3 or less when determined at a pH of about 11 as initially prepared; and (c) about 0.5 or less after exposure, at a pH of about 11, to a temperature of about 100.degree. C. for a time period of about 1 hour.
- 17. The method of claim 1 wherein the borohydride treatment is conducted by contacting said borohydride material with a non-aqueous solution of said glycoside product.
Parent Case Info
This application is a continuation of application Ser. No. 061,859, filed 6/12/87, now abandoned.
US Referenced Citations (27)
Foreign Referenced Citations (3)
Number |
Date |
Country |
3232791 |
Mar 1984 |
DEX |
802860 |
Oct 1958 |
GBX |
981965 |
Feb 1965 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Article entitled, "Eliminating Color, Odor Problems with Sodium Borohydride", from the Jun. 1978 Soap/Cosmetics/Chemical Specialties, by Herman. |
Continuations (1)
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Number |
Date |
Country |
Parent |
61859 |
Jun 1987 |
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