GB968332A - An organic chromium tanning agent - Google Patents
An organic chromium tanning agentInfo
- Publication number
- GB968332A GB968332A GB89661A GB89661A GB968332A GB 968332 A GB968332 A GB 968332A GB 89661 A GB89661 A GB 89661A GB 89661 A GB89661 A GB 89661A GB 968332 A GB968332 A GB 968332A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lignin
- sulphonic acid
- leather
- weight
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention comprises a leather tanning agent produced by adding slowly, with agitation, an aqueous solution of lignic sulphonic acid to an aqueous solution of a hexavalent chromium compound consisting of chromic acid or an alkali metal bichromate in an amount of 25-50% by weight of the lignin sulphonic acid (expressed as "lignin solids", herein defined) to yield a reaction product containing chromium, at least 50% by weight of which is in a non-ionic form. Lignin sulphonic acid refers to lignin sulphonic acid obtained from neutralized sulphite waste liquors which, generally, have been neutralized with Ca or Mg salts and when spray dried give water soluble lignin sulphonate or "lignin solids". The term "non-ionic" means chromium which carries substantially no electrical charge as detectable by ion exchange techniques. The preferred chromium compounds are the bichromates, particularly sodium bichromate. The lignin sulphonic acid may be used as such or may be formed in situ by acidifying a solution of lignin solids with a mineral acid, e.g. with 35% by weight of H2SO4. Suitably a 50% by weight sodium bichromate solution is added to an aqueous solution of lignin sulphonic acid over a period of 1-2 hours with continuous agitation. The resulting solution has a pH of about 2, and may be used as such, but preferably is partially neutralized with alkali to raise the pH to 3.0-4.5, especially 4.0. The solution can be used as such for tanning (see Division C6) or spray dried at an elevated temperature. Example (1) describes the preparation of a solution containing 70.7% non-ionic chromium from sodium bichromate.ALSO:Leather is tanned by treatment with a composition containing chromium at least 50% by weight of which is in a non-ionic form obtained by adding slowly, with agitation, an aqueous solution of lignin sulphonic acid to an aqueous solution of a hexavalent chromium compound consisting of chromic acid or an alkali metal bichromate in the amount 25-50% by weight of the lignin sulphonic acid (expressed as "lignin solids"). "Lignin solids" refers to the material obtained by spray-drying the lignin sulphonates formed by neutralizing sulphite waste liquors with Ca or Mg salts. The tanned leather may be retanned with known tanning materials. Example (2) describes the tanning of pickled steer hides. In Examples (3) and (4) the thus-tanned leather is retanned with a chrome sulphate and vegetable tannage respectively. In Example (5) the leather from Examples (2) and (3) is fatliquored with a cationic-non-ionic animal type fat liquor. Examples (6) to (8) describe the properties of the leather tanned by the present process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB89661A GB968332A (en) | 1961-01-09 | 1961-01-09 | An organic chromium tanning agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB89661A GB968332A (en) | 1961-01-09 | 1961-01-09 | An organic chromium tanning agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB968332A true GB968332A (en) | 1964-09-02 |
Family
ID=9712383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB89661A Expired GB968332A (en) | 1961-01-09 | 1961-01-09 | An organic chromium tanning agent |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB968332A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534062A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process capable of conducting neutralization by recycling waste liquid infinitely |
| CN104946821A (en) * | 2015-05-29 | 2015-09-30 | 兴业皮革科技股份有限公司 | Method for solving exceeding standard problem of hexavalent chromium from natural leather |
-
1961
- 1961-01-09 GB GB89661A patent/GB968332A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534062A (en) * | 2010-12-14 | 2012-07-04 | 张壮斗 | Tanning process capable of conducting neutralization by recycling waste liquid infinitely |
| CN102534062B (en) * | 2010-12-14 | 2015-10-14 | 张壮斗 | A kind of recycle waste liquid carries out the leather-making technology neutralized |
| CN104946821A (en) * | 2015-05-29 | 2015-09-30 | 兴业皮革科技股份有限公司 | Method for solving exceeding standard problem of hexavalent chromium from natural leather |
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