WO2006070398A1 - Process for the preparation of bio-tanning agent - Google Patents
Process for the preparation of bio-tanning agent Download PDFInfo
- Publication number
- WO2006070398A1 WO2006070398A1 PCT/IN2004/000435 IN2004000435W WO2006070398A1 WO 2006070398 A1 WO2006070398 A1 WO 2006070398A1 IN 2004000435 W IN2004000435 W IN 2004000435W WO 2006070398 A1 WO2006070398 A1 WO 2006070398A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bio
- tanning agent
- acid
- hide
- range
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L89/00—Compositions of proteins; Compositions of derivatives thereof
- C08L89/04—Products derived from waste materials, e.g. horn, hoof or hair
- C08L89/06—Products derived from waste materials, e.g. horn, hoof or hair derived from leather or skin, e.g. gelatin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H1/00—Macromolecular products derived from proteins
- C08H1/06—Macromolecular products derived from proteins derived from horn, hoofs, hair, skin or leather
Definitions
- the present invention relates to a process for the preparation of bio-tanning agent. More particularly, the present invention provides a simple process for preparing bio-tanning agent from collagenous source. It is envisaged to have enormous potential application in leather processing industry as an environment friendly option for tanning hides/skins, whereby the pollution load would be significantly reduced compared to that of the conventional tanning process.
- Background of the Invention Commercially skins/hides are tanned, stabilized against microbes and heat, using chromium salts.
- Conventional chrome tanning is a popular and mostly practiced technique in the world and employs basic chromium sulfate salt, a progenitor of several chromium species.
- tanned wastes are many fold such as the manufacture of bonded leather, leather boards, fibrous sheets grafted with acrylates, insulators and building materials, composites for footwear, sound-proof roofing material, etc as discussed by Rao et al (Journal of the American Leather Chemists Association, 99, 170, 2004).
- the non-tanned wastes such as raw hide/skin trimmings, limed hide splits, hair, hide/skin fleshings, delimed wastes/trimmings have been processed in to various useful products such as glue, gelatine, pet treats and collagen for medical use as described by Mann (Processing and utilization of animal byproducts, FAO, 1962).
- the obtained compounds are particularly used in the therapeutic field.
- the drawback of this method is the use of very high temperature and stringent control of parameters such as pH and pressure.
- the main objective of the present invention is to provide a process for the preparation of bio-tanning agent, which precludes the drawbacks stated above.
- Another objective of the present invention is to provide a process for preparing bio- tanning agent that does not require very high temperature.
- Yet another objective of the present invention is to provide a process for preparing bio-tanning agent that does not require strict control measures such as pH and pressure.
- Still another objective of the present invention is to provide a process for preparing bio-tanning agent that does not require any buffering medium.
- the present invention provides a process for the preparation of bio- tanning agent, which comprises
- step (b) adjusting the pH of the slurry, as formed in step (i), in the range of 5.5-7.0 by known method to obtain the bio-tanning agent in liquid form,
- the collagenous material used may be selected from raw hide/skin trimmings, limed hide splits, green fleshings, limed skin/hide fleshings, delimed pelt wastes/trimmings, hide powder either alone or in any combination.
- the amount of water used may be in the range of 50-200% by volume on the wet weight of the collagenous material.
- the acid used may be selected from sulfuric acid, formic acid, acetic acid, hydrochloric acid either alone or in any combination.
- the known method of drying may be such as spray drying, drum drying. Description of the Invention
- the invention provides a process for the preparation of a bio-tanning agent by: i. treating collagenous material in aqueous medium, to a temperature in the range of 80-98 0 C at a pH not exceeding 3.0 for a period not less than 30 minutes by known method using known acid, to obtain a slurry followed by adjusting the temperature of the slurry in the range of 20-40 0 C, ii. adjusting the pH of the slurry, as formed in step (i), in the range of 5.5-7.0 by known method to obtain the bio-tanning agent in liquid form, iii. drying the bio-tanning agent liquid at 130-260 0 C, as formed in step (ii), by known method as an optional step, to obtain the bio-tanning agent in the dry powder form.
- the collagenous material used is selected from raw hide/skin trimmings, limed hide splits, green fleshings, limed skin/hide fleshings, delimed pelt wastes/trimmings, hide powder either alone or in any combination.
- the amount of water used may be in the range of 50- 200% by volume on the wet weight of the collagenous material.
- the acid used is selected from sulfuric acid, formic acid, acetic acid, hydrochloric acid either alone or in any combination. Drying is achieved by known methods such as spray drying or drum drying.
- Collagenous material is added to 50-200% by volume of water, measured on the wet weight of the collagenous source and treated with known acid to adjust the pH at not more than 3 at a temperature in the range of 80-98 0 C for a period not less than 30 minutes.
- the temperature of the mixture is then adjusted in the range of 20-40 0 C.
- pH of the resulting slurry is adjusted in the range of 5.5-7.0 by adding known alkali to obtain the bio-tanning agent in liquid form. This is optionally dried by known method at a temperature in the range of 130-
- the inventive step of the present invention lies in treating collagen material with a known acid, adjusting the pH at less than
- Raw hide/skin trimmings were washed in 12 lit water for 2 hrs in a pit. Then the trimmings were again washed in 12 lit fresh water for 2 hrs. The washed trimmings were sliced into small pieces using mechanical slicer. The sliced material ' weight was found to be 4.8 kg and charged into a reactor. 7.2 lit water and 60 gms concentrated sulfuric acid was added to the reactor with stirring. Then the reactor was heated to 98 0 C with continuous stirring for a period of 120 minutes. The pH of the solution was found to be 1.5. Obtained viscous solution was air cooled to 4O 0 C. The cooled solution was neutralized to a pH 7.0 using 48 gms sodium hydroxide with continuous stirring.
- Example 2 Limed hide splits, weighing 6 kg, were sliced into small pieces using mechanical slicer. The weight of the sliced material was found to be 5.6 kg. The sliced materials were washed with 11.2 lit water for 15 minutes in a reactor. Then, the water was drained from the reactor. 2.8 lit water and a mixture of 84 gms concentrated sulfuric acid, 56 gms formic acid and 28 gms hydrochloric acid were added to the reactor with stirring. Then the reactor was heated to 95 0 C with continuous stirring for a period of 30 minutes.
- the pH of the solution was found to be 1.3. Obtained viscous solution was cooled to 37 0 C using water cooling system. The cooled solution was neutralized to a pH 5.5 using 140 gms sodium hydroxide and 28 gms sodium carbonate with continuous stirring. Then the solution was spray dried at a temperature of 26O 0 C and the resulting bio-tanning agent powder was stored in a plastic container. Total weight of the dried powder was found to be 1550 gms.
- the raw hide/skin trimmings and green hide fleshings were washed in 12 lit water for 2 hrs in a pit. Then the trimmings and green fleshings were again washed in 12 lit water for 2 hrs. The washed trimmings and green fleshings were sliced into small pieces using mechanical slicer. The sliced material weight was found to be 7.4 kg and charged into a reactor. 14.8 lit water and a mixture of 92.5 gms concentrated sulfuric acid, 18.5 gms acetic acid and 37 gms formic acid were added to the reactor with stirring. Then the reactor was heated to 98 0 C with continuous stirring for a period of 60 minutes. The pH of the solution was found to be 1.2.
- Delimed pelt wastes/trimmings and limed fleshings were sliced into small pieces using mechanical slicer.
- the sliced weight of the material was found to be 6.6 kg.
- the sliced materials were washed with 19.8 lit water for 15 mins in a reactor. Then, the water was drained from the reactor. 6.6 lit water and 99 gms concentrated sulfuric acid was added to the reactor with stirring. Then the reactor was heated to 92 0 C with continuous stirring for a period of 90 minutes.
- the pH of the solution was found to be 1.6. Obtained viscous solution was cooled to 2O 0 C using ice water cooling system.
- Hide powder weighing 2 kgs, was washed with 4000 ml water in a pit for 3 hrs. The weight of the washed wet hide powder was found to be 7.8 kg.
- the wet hide powder was charged into a reactor. To this, 7.8 lit water and 78 gms concentrated sulfuric acid was added to the reactor with stirring. Then the reactor was heated to 8O 0 C with continuous stirring for a period of 30 minutes. The pH of the solution was found to be 1.2. Obtained viscous solution was air cooled to 37 0 C. The cooled solution was neutralized to a pH 7.0 using 58.4 gms sodium hydroxide and 19.6 gms sodium carbonate with continuous stirring. Then the solution was spray dried at a temperature of 260 0 C and the resulting bio-tanning agent powder was stored in a plastic container. Total weight of the dried powder was found to be 1900 gms. The following are the advantages of the present invention:
- the developed product has wide applications in leather industry, especially as a bio- tanning agent, thereby replaces toxic or hard biodegradable conventional tanning agents.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Dermatology (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IN2004/000435 WO2006070398A1 (en) | 2004-12-30 | 2004-12-30 | Process for the preparation of bio-tanning agent |
BRPI0419261-3A BRPI0419261A (en) | 2004-12-30 | 2004-12-30 | process for the preparation of biological agent for tanning |
EP04816683A EP1844107A1 (en) | 2004-12-30 | 2004-12-30 | Process for the preparation of bio-tanning agent |
CNA200480044740XA CN101090946A (en) | 2004-12-30 | 2004-12-30 | Process for the preparation of bio-tanning agent |
CA2592856A CA2592856C (en) | 2004-12-30 | 2004-12-30 | Process for the preparation of bio-tanning agent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IN2004/000435 WO2006070398A1 (en) | 2004-12-30 | 2004-12-30 | Process for the preparation of bio-tanning agent |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006070398A1 true WO2006070398A1 (en) | 2006-07-06 |
Family
ID=34960559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IN2004/000435 WO2006070398A1 (en) | 2004-12-30 | 2004-12-30 | Process for the preparation of bio-tanning agent |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1844107A1 (en) |
CN (1) | CN101090946A (en) |
BR (1) | BRPI0419261A (en) |
CA (1) | CA2592856C (en) |
WO (1) | WO2006070398A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1227534A (en) * | 1967-08-31 | 1971-04-07 | ||
RU1823879C (en) * | 1991-08-02 | 1993-06-23 | Киевский технологический институт легкой промышленности | Method of tanning out of collagen-containing waste of chrome tanning for protein substance preparing |
RU2085592C1 (en) * | 1995-11-16 | 1997-07-27 | Центральный научно-исследовательский институт кожевенно-обувной промышленности | Process for preparing synthetic tanning agent |
US20040030102A1 (en) * | 2000-12-22 | 2004-02-12 | Giancarlo Artoni | Process for gelatines extraction and chromium salts recovery from tanned hides and skins shavings |
-
2004
- 2004-12-30 EP EP04816683A patent/EP1844107A1/en not_active Withdrawn
- 2004-12-30 CN CNA200480044740XA patent/CN101090946A/en active Pending
- 2004-12-30 BR BRPI0419261-3A patent/BRPI0419261A/en not_active IP Right Cessation
- 2004-12-30 CA CA2592856A patent/CA2592856C/en not_active Expired - Fee Related
- 2004-12-30 WO PCT/IN2004/000435 patent/WO2006070398A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1227534A (en) * | 1967-08-31 | 1971-04-07 | ||
RU1823879C (en) * | 1991-08-02 | 1993-06-23 | Киевский технологический институт легкой промышленности | Method of tanning out of collagen-containing waste of chrome tanning for protein substance preparing |
RU2085592C1 (en) * | 1995-11-16 | 1997-07-27 | Центральный научно-исследовательский институт кожевенно-обувной промышленности | Process for preparing synthetic tanning agent |
US20040030102A1 (en) * | 2000-12-22 | 2004-02-12 | Giancarlo Artoni | Process for gelatines extraction and chromium salts recovery from tanned hides and skins shavings |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch Week 199444, Derwent World Patents Index; Class D18, AN 1994-356333, XP002343626 * |
DATABASE WPI Section Ch Week 199815, Derwent World Patents Index; Class D18, AN 1998-167219, XP002343625 * |
Also Published As
Publication number | Publication date |
---|---|
CN101090946A (en) | 2007-12-19 |
BRPI0419261A (en) | 2007-12-18 |
CA2592856C (en) | 2012-09-11 |
CA2592856A1 (en) | 2006-07-06 |
EP1844107A1 (en) | 2007-10-17 |
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