MXPA97005809A - Process for curtimiento de cu - Google Patents
Process for curtimiento de cuInfo
- Publication number
- MXPA97005809A MXPA97005809A MXPA/A/1997/005809A MX9705809A MXPA97005809A MX PA97005809 A MXPA97005809 A MX PA97005809A MX 9705809 A MX9705809 A MX 9705809A MX PA97005809 A MXPA97005809 A MX PA97005809A
- Authority
- MX
- Mexico
- Prior art keywords
- tanning
- skin
- conditioning
- tannin
- chromium
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 210000003491 Skin Anatomy 0.000 claims abstract description 20
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 11
- 239000011651 chromium Substances 0.000 claims abstract description 11
- 230000003750 conditioning Effects 0.000 claims abstract description 11
- HSJKGGMUJITCBW-UHFFFAOYSA-N 3-Hydroxybutanal Chemical compound CC(O)CC=O HSJKGGMUJITCBW-UHFFFAOYSA-N 0.000 claims abstract description 10
- VXMKYRQZQXVKGB-CWWHNZPOSA-N Tannin Chemical compound O([C@H]1[C@H]([C@@H]2OC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)O[C@H]([C@H]2O)O1)O)C(=O)C1=CC(O)=C(O)C(O)=C1 VXMKYRQZQXVKGB-CWWHNZPOSA-N 0.000 claims abstract description 9
- 235000018553 tannin Nutrition 0.000 claims abstract description 9
- 229920001864 tannin Polymers 0.000 claims abstract description 9
- 239000001648 tannin Substances 0.000 claims abstract description 9
- 239000010985 leather Substances 0.000 claims abstract description 7
- 150000007942 carboxylates Chemical class 0.000 claims abstract description 6
- 238000010926 purge Methods 0.000 claims abstract description 6
- 150000001412 amines Chemical class 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 102000008186 Collagen Human genes 0.000 claims abstract description 3
- 108010035532 Collagen Proteins 0.000 claims abstract description 3
- 229960005188 collagen Drugs 0.000 claims abstract description 3
- 229920001436 collagen Polymers 0.000 claims abstract description 3
- 230000000903 blocking Effects 0.000 claims abstract 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000015450 Tilia cordata Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M NaHCO3 Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- UKLNMMHNWFDKNT-UHFFFAOYSA-M Sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 2
- IKHGUXGNUITLKF-UHFFFAOYSA-N acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229960002218 sodium chlorite Drugs 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UIKQNMXWCYQNCS-UHFFFAOYSA-N 2-hydroxybutanal Chemical compound CCC(O)C=O UIKQNMXWCYQNCS-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000001187 sodium carbonate Substances 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229940001593 sodium carbonate Drugs 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The present invention relates to a process for leather tanning, characterized by encompassing stages of purging or cleansing of the skin, conditioning and tanning to chromium and / or tannin, the conditioning employing hydroxybutanal, which reacts by blocking the amines of the skin. collagen and freeing carboxylates, which reduces the isoelectric point to 4.0 to 4.5 by taking skin susceptible to effective chromium treatment by binding to carboxylates, or to tannin by hydrogen bonding
Description
PROCESS FOR LEATHER CURTIMIENTO
The present invention relates to a new process for tanning chrome and / or tannin leather. The conventional processes for leather tanning include the following operations: cleaning or purging the skin, pickling, pre-tanning and tanning. The purge consists of the removal of limescale and cleaning with enzymes, from the skin coming from the calera. The second stage is the piquelaje. where the clean skin is subjected to treatment with sulfuric acid and sodium chlorite, in order to prevent its deterioration. Afterwards, pre-chilling with chromium or glutaraldehyde is carried out, which is the process that provides the skin with the characteristics of preliminary tanning, allowing some operations such as division and subsequent loosening of the leather. This phase has as consequence economy in later stages with the use of less quantity of chemical products. Finally the tanning of the skin with chrome and / or tannin is carried out according to the specifications that must be reached. The object of the present invention is an innovative process of tanning of animal skins, by which by adding a specific product which is hydroxybutanal to the purged skin, the conditioning and subsequent tanning to chromium and / or tannin is obtained. This process consists of the modification of the isoelectric point, which during the reaction would vary between 3.0 to 3.5 for 4.0 to 4.5 with pH in the same strip. The process proposed by the invention favors the penetration of chromium during tanning, since the strip of pH of penetration is wide, varying from 4.0 to 6.0 with optimal point between 4.0 and 4.5, which coincides with that of the process of invention. The advantages of the present invention over conventional leather tanning processes are: a) it is self-supporting, not requiring the placement of alkalis; b) eliminate the phases of piquelling and pre-tanning with the consequent removal of sulfuric acid and sodium chloride, and create the conditioning phase: c) remove the format of sodium and sodium bicarbonate used in the post-piquelage treatment; d) simplify the treatment of waste, due to the reduction of the amount of chromium and the elimination of sodium chlorite (main sources of waste contamination); e) reduction of total tanning time from 24 to 36 hours for between 12 to 14 hours. The tanning process, object of the present invention encompasses the steps of purging or cleansing the skin, conditioning with hydroxybutanal and tanning to chromium and / or tannin. The purge of the skin is carried out according to conventional tannery processes. The hydroxybutanal provides a conditioning of the purged skin, allowing the subsequent treatments of tanning and retanning, when it is the case. The conditioning is the alteration of the isoelectric point of the purged skin as a consequence of the reaction of the hydroxybutanal with the amine. Hydroxybutanal blocks the amines of collagen (proteins found in the skin) by freeing carboxylates and because of this the isoelectric point is reduced, taking the skin susceptible to effective tanning to chromium (joining carboxylates) or tannin (joining by bridges of hydrogen). The percentage utilization of hydroxybutanal for conditioning varies from 2.5 to 3.5% on the weight of the skin free of lime and the reaction time is approximately 3 to 4 hours. Subsequently, the tanning agent is added, being that in the case of chromium, the tanning time is approximately 6 to 7 hours and in tanning tanning from 12 to 14 hours. The hydroxybutanal is obtained from the reaction of the acetic aldehyde and its structural formula is as follows:
H3C CH CH2 OH H
The characteristics of the product are: molecular weight (pm) = 88.0 potential Hydrogen (pH) = 4.2 to 4.4 concentration = 40 + 2% hydroxylbutanal
Claims (2)
1 . Process for leather tanning, characterized by covering stages of purging or cleansing of the skin, conditioning and tanning to chromium and / or tannin, being that the conditioning employs hydroxybutanal, which reacts by blocking the amines of collagen and freeing carboxylates, which reduces the isoelectric point to 4.0 to 4.5 by taking the skin susceptible to the effective treatment of chromium by binding to carboxylates, or to tannin by hydrogen bonding.
2. Process for leather tanning, according to claim 1, characterized in that the hydroxy butanal is used in the conditioning stage, in the proportion of 2.5 to 3.0% on the weight of the skin free of lime, in the concentration of 40+. 2% and with a pH of 4.2 to 4.4, with a reaction time of 3 to 4 hours.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9603419A BR9603419A (en) | 1996-07-31 | 1996-07-31 | Leather tanning process |
| PIPI9603419-0 | 1996-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9705809A MX9705809A (en) | 1998-08-30 |
| MXPA97005809A true MXPA97005809A (en) | 1998-11-12 |
Family
ID=
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