DE925605C - Decalcifying agent - Google Patents
Decalcifying agentInfo
- Publication number
- DE925605C DE925605C DEC793A DEC0000793A DE925605C DE 925605 C DE925605 C DE 925605C DE C793 A DEC793 A DE C793A DE C0000793 A DEC0000793 A DE C0000793A DE 925605 C DE925605 C DE 925605C
- Authority
- DE
- Germany
- Prior art keywords
- citric acid
- decalcifying
- further content
- liquor according
- acid
- 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
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 54
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000000855 fermentation Methods 0.000 claims description 6
- 230000004151 fermentation Effects 0.000 claims description 6
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric Acid Chemical compound [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000010985 leather Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 claims description 4
- 239000001354 calcium citrate Substances 0.000 claims description 4
- 235000013337 tricalcium citrate Nutrition 0.000 claims description 4
- 235000014633 carbohydrates Nutrition 0.000 claims description 3
- 150000001720 carbohydrates Chemical class 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 239000011975 tartaric acid Substances 0.000 claims description 3
- 235000002906 tartaric acid Nutrition 0.000 claims description 3
- 150000007513 acids Chemical class 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 150000007524 organic acids Chemical class 0.000 description 3
- 235000005985 organic acids Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 2
- 235000011054 acetic acid Nutrition 0.000 description 2
- 239000001166 ammonium sulphate Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 239000004251 Ammonium lactate Substances 0.000 description 1
- 241000283707 Capra Species 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 244000248349 Citrus limon Species 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229940059265 ammonium lactate Drugs 0.000 description 1
- 235000019286 ammonium lactate Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- RZOBLYBZQXQGFY-HSHFZTNMSA-N azanium;(2r)-2-hydroxypropanoate Chemical compound [NH4+].C[C@@H](O)C([O-])=O RZOBLYBZQXQGFY-HSHFZTNMSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 244000309466 calf Species 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/08—Deliming; Bating; Pickling; Degreasing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/8215—Microorganisms
- Y10S435/911—Microorganisms using fungi
- Y10S435/913—Aspergillus
- Y10S435/917—Aspergillus niger
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
Entkalkungsmittel Die vorliegende Erfindung betrifft ein neuartiges Verfahren zur Entfernung von Kalk und anderen Alkalien, wie z: B. Natriums,ulfid, aus- gekalkten Häuten und Fellen und ist gekennzeichnet durch die Verwendung von roher Citronensäure.Descaling agent The present invention relates to a novel one Process for removing lime and other alkalis, such as: sodium, sulphide, limed hides and skins and is characterized by the use of raw citric acid.
In der Praxis wurden die mittels Alkalien, wie Kalk od. dgl., präparierten Tierhäute zum Zwecke der Entkalkung bisher mit anorganischen Säuren, wie Salzsäure, Schwefelsäure, Borsäure, oder mit organischen Säuren, wie Ameisensäure, Essigsäure, Milchsäure, Buttersäure oder Citronensäure, behandelt. Abgesehen davon, daß reine Citronensäure wegen der Bildung schwerlöslichen Calciumcitrats von vornherein für die Praxis weniger geeignet erscheint und Citronensaft, in welchem die Citronensäure in für eine unmittelbare Verwendung als Entkalkungsmittel unzureichender Menge enthalten ist, also erst einer Eindickung bedürfte, sich wegen seiner Neigung zum Gären nicht zum Transport und zur Lagerung eignet, weisen die vorerwähnten Entkalkungsmittel den Nachteil auf, daß die Blößen unter der Einwirkung der Säureionen insbesondere bei Überschuß des Entkalkungsmittels stark anschwellen, wodurch die Qualität des Leders erheblich beeinträchtigt wird. Eine derartige Nebenwirkung läßt sich zwar dadurch abschwächen, daß man die Säuren mit Ammoniak teilweise neutralisiert, doch ist man in diesem Falle gezwungen, eine entsprechend größere Menge der teilweise neutralisierten Säure zum Herauslösen des Kalkes einzusetzen.In practice, they were prepared by means of alkalis such as lime or the like Animal skins for the purpose of decalcification so far with inorganic acids such as hydrochloric acid, Sulfuric acid, boric acid, or with organic acids such as formic acid, acetic acid, Lactic acid, butyric acid or citric acid. Besides being pure Citric acid from the outset because of the formation of poorly soluble calcium citrate the practice seems less suitable and lemon juice, in which the citric acid Contains insufficient quantities for immediate use as a decalcifying agent is, so it would first need a thickening, not because of its tendency to ferment The aforementioned decalcifying agents are suitable for transport and storage the disadvantage that the pelts under the action of acid ions in particular if there is an excess of decalcifying agent, it will swell, reducing the quality of the Leather is significantly affected. Such a side effect can be weaken by partially neutralizing the acids with ammonia, but in this case one is forced to use a correspondingly larger amount of the partially use neutralized acid to dissolve the lime.
Es wurde weiter schon vorgeschlagen, als Entkalkungsmittel die Ammoniumsalze von anorganischen oder organischen Säuren, wie Ammonsulfat, Ammonlaktat, Ammontartrat und Ammoncitrat, für sich zu verwenden. Einer allgemeinen Anwendung dieser Salze steht teils eine relativ geringe Entkalkungswirkung, teils auch der _ verhältnismäßig hohe Preis entgegen. Es bestand deshalb die -Aufgabe, für diese Arbeitsweise ein geeignetes Mittel zu finden, das bei einer guten Entkalkungswirkung die Blößen nicht schädigt und gleichzeitig so preiswert ist, daß es für einen Masseneinsatz in Betracht kommt.It has also been proposed that ammonium salts be used as decalcifying agents of inorganic or organic acids, such as ammonium sulfate, Ammonium lactate, Ammontartrate and ammonium citrate, to be used by themselves. A general application some of these salts have a relatively low decalcifying effect, and some also have a _ relatively high price. There was therefore the task for this Working method to find a suitable agent that has a good decalcifying effect does not damage the nakedness and at the same time is so inexpensive that it is suitable for mass use comes into consideration.
Es wurde nun gefunden, daß ein ideales Entkalkungsmittel, das alle Voraussetzungen der Aufgabenstellung erfüllt, die rohe Citronensäure ist, wie sie bei der Vergärung von kohlehydrathaltigen Substraten mit Mikroorganismen anfällt; denn sie ist nicht nur verhältnismäßig billig, sondern besitzt auch eine ausgezeichnete Entkalkungswirkung, ohne dabei die tierischen Häute zum Schwellen zu bringen. Dies beruht vermutlich auf einer -kombinierten entkalkenden und quellungsverhindernden Wirkung. Da auch jegliche Neutralisation mit Alkali entbehrlich ist, kommt man pro Einheit Trockensubstanz mit relativ geringen Mengen aus.It has now been found that an ideal descaling agent does it all Requirements of the task fulfilled, the raw citric acid is how it arises from the fermentation of substrates containing carbohydrates with microorganisms; because it is not only relatively cheap, but also has an excellent one Decalcification effect without causing the animal skins to swell. this is probably based on a combined decalcifying and swelling preventive Effect. Since any neutralization with alkali is unnecessary, one comes pro Unit of dry matter with relatively small amounts.
Die großen wirtschaftlichen Vorteile der Verwendung einer solchen Rohlösung als Entkalkungsmittel für geäscherte Häute und Felle gegenüber den bisher angewandten Mitteln liegen auf der Hand, da keinerlei Kosten für die Aufbereitung der wirksamen Entkalkungsbestandteile, wie Herstellung des Calciumsalzes, Zerlegung mit Schwefelsäure, Kristallisation und Abtrennung der reinen Säure, erforderlich sind, sondern die Gärlauge so verwendet werden kann, wie sie anfällt.The great economic benefits of using such Raw solution as a decalcifying agent for ashed hides and skins compared to the previous one The means used are obvious, as there are no costs for processing the effective decalcifying components, such as the production of the calcium salt, decomposition with sulfuric acid, crystallization and separation of the pure acid but the fermentation liquor can be used as it is.
Besonders überraschend ist es. daß bei der erfindungsgemäßen Verwendung der bei der Vergärung von Kohlehydraten anfallenden Citronensäurerohlauge die Entkalkung geäscherter Häute und Felle nicht nur erheblich rascher vonstatten geht als bei Verwendung reiner Citronensäure, sondern die Löslichkeit des Calciumcitrats durch die gleichzeitige Anwesenheit der in der Rohlauge enthaltenen Begleitstoffe um ein Vielfaches erhöht wird, so daß keinerlei störende Calciumcitratausfällungen zu befürchten sind.It is particularly surprising. that in the use according to the invention decalcification of the citric acid raw liquor that occurs during the fermentation of carbohydrates of ashed hides and skins does not only proceed considerably faster than with Use of pure citric acid, but rather the solubility of the calcium citrate the simultaneous presence of the accompanying substances contained in the raw liquor around one Is increased many times, so that there is no need to fear any disruptive calcium citrate precipitations are.
Ein weiterer technischer Fortschritt dieser neuen Arbeitsweise beruht darauf, daß die Citronensäure durch die Verwendung in Form ihrer Rohlauge preislich erst für einen Verwendungszweck zugänglich wird, für den bisher andere, in ihren Eigenschaften nicht befriedigende Chemikalien verwendet wurden.Another technical advance of this new way of working is based ensure that citric acid is priced by using it in the form of its raw liquor is only accessible for one purpose for which previously others, in their Properties unsatisfactory chemicals were used.
Die Citronensäuregärlauge kann nach Bedarf auch mit anderen organischen Säuren, wie Milchsäure, Essigsäure, Weinsäure u. a., gemischt werden. Besonders vorteilhaft ist die Kombination mit Kristallisationsmutterlaugen der Wein- und Citronensäurefabrikation, die eine Art Abfallprodukt darstellen. Solche Mischungen haben vor allem den Vorzug, bei großer Ergiebigkeit doch verhältnismäßig sehr billig zu sein. Auch die Kbmbination mit Entkalkungsmitteln anderer Art, wie Ammonsulfat, polymere Phosphate, ist möglich. Außerdem kann das neue Mittel als Zusatz für künstliche Lederbeizen dienen.The citric acid fermentation liquor can, if required, also with other organic Acids such as lactic acid, acetic acid, tartaric acid and others can be mixed. Particularly The combination with crystallization mother liquors from tartaric and citric acid production is advantageous, which are a kind of waste product. Such mixtures have the main advantage to be relatively cheap with great productivity. Also the combination other types of decalcifying agents such as ammonium sulphate or polymeric phosphates are possible. The new agent can also be used as an additive for artificial leather stains.
Beispiel i Zu einem im Faß befindlichen, nach dem Äschern kurz gewässerten Ziegenfell gibt man so viel einer 15 1/o Citronensäure enthaltenden Gärlauge, bis die Konzentration in der Flotte -etwa 1, 5 0/0 beträgt. Die Entkälkunggeht sehr rasch vonstatten. Die Blößen fühlen sich besonders glatt an, und das in der üblichen Weise gewonnene Chevreauleder zeigt einen ganz besonders milden Narben.Example i For a barrel that has been briefly watered after liming Goat skin is given as much of a fermentation liquor containing 15 1 / o citric acid until the concentration in the liquor is about 1.5%. The deliming goes very well proceed quickly. The pelts feel particularly smooth, and that in the usual way Chevreau leather, which is wisely obtained, has a particularly mild grain.
Beispiel e In eine Lösung, die im Liter io g Rohcitronensäure und 3 g Ammonsulfat enthält, wird ein in der üblichen Weise-geäschertes und in Wasser gespültes Kalbfell eingebracht und so lange entkalkt, bis die Blöße im Schnitt kalkfrei ist, was etwa i Stunde in Anspruch nimmt. Anschließend wird gebeizt und auf Boxcalf verarbeitet. Das fertige Leder zeigt einen besonders feinen und glatten Narben.Example e In a solution containing io g of crude citric acid per liter and Containing 3 g of ammonium sulphate is a in the usual manner-ashed and in water Rinsed calfskin is brought in and decalcified until the skin is free of limescale in the cut is what takes about an hour. Then it is pickled and on box calf processed. The finished leather shows a particularly fine and smooth grain.
Claims (1)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEC793A DE925605C (en) | 1950-04-07 | 1950-04-07 | Decalcifying agent |
| BE505164D BE505164A (en) | 1950-04-07 | 1951-08-08 | |
| US247370A US2639967A (en) | 1950-04-07 | 1951-09-19 | Deliming hides with citric acid fermentation liquor |
| DK356452AA DK80394C (en) | 1950-04-07 | 1952-11-13 | Method for removing limescale and other alkaline compounds from hides and skins. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEC793A DE925605C (en) | 1950-04-07 | 1950-04-07 | Decalcifying agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE925605C true DE925605C (en) | 1955-03-24 |
Family
ID=7012418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEC793A Expired DE925605C (en) | 1950-04-07 | 1950-04-07 | Decalcifying agent |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2639967A (en) |
| BE (1) | BE505164A (en) |
| DE (1) | DE925605C (en) |
| DK (1) | DK80394C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2714813C3 (en) * | 1977-04-02 | 1979-11-29 | Basf Ag, 6700 Ludwigshafen | Lime and sulfide-free liming process |
| DE2822072A1 (en) * | 1978-05-20 | 1979-11-29 | Henkel Kgaa | USE OF WATER-INSOLUBLE ALUMINUM SILICATES IN THE MANUFACTURING OF LEATHER |
| DE2825081C2 (en) * | 1978-06-08 | 1980-06-12 | Basf Ag, 6700 Ludwigshafen | Process for deliming hides |
| CN111842310B (en) * | 2020-07-22 | 2021-11-30 | 浙江农林大学 | Biomass gradient deliming pretreatment method |
| NL2027083B1 (en) * | 2020-12-09 | 2022-07-07 | Stahl Int B V | Process for deliming of hides, skins or pelts |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE268236C (en) * | ||||
| FR360854A (en) * | 1905-12-22 | 1906-05-05 | Ottokar Henry Nowak | Substance for tanning hides and etching fabrics |
| GB409599A (en) * | 1933-11-03 | 1934-05-03 | Filippo Perciabosco | A process for the purging of skins and hides in tanning |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US223200A (en) * | 1879-12-30 | Improvement in processes of tanning | ||
| US515033A (en) * | 1894-02-20 | Carl wehmer | ||
| US996509A (en) * | 1905-06-14 | 1911-06-27 | Dermiforma Company Of America | Tanning process. |
| US873074A (en) * | 1905-09-16 | 1907-12-10 | Nowak Mfg Company | Substance for treating hides and process of making same. |
| DE461356C (en) * | 1923-12-19 | 1928-06-13 | Montan Und Industrialwerke Vor | Process for the production of fermented citric acid |
| FR609316A (en) * | 1925-04-18 | 1926-08-12 | Process of dislodging and preparing hides for tanning | |
| US1570383A (en) * | 1925-07-22 | 1926-01-19 | Mccandlish Douglas | Treatment of hides and skins for manufacture into leather |
| BE331453A (en) * | 1925-10-26 | |||
| US2132579A (en) * | 1935-04-02 | 1938-10-11 | Rohm Otto | Method for producing unhaired hides with the aid of mold tryptases |
-
1950
- 1950-04-07 DE DEC793A patent/DE925605C/en not_active Expired
-
1951
- 1951-08-08 BE BE505164D patent/BE505164A/fr unknown
- 1951-09-19 US US247370A patent/US2639967A/en not_active Expired - Lifetime
-
1952
- 1952-11-13 DK DK356452AA patent/DK80394C/en active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE268236C (en) * | ||||
| FR360854A (en) * | 1905-12-22 | 1906-05-05 | Ottokar Henry Nowak | Substance for tanning hides and etching fabrics |
| GB409599A (en) * | 1933-11-03 | 1934-05-03 | Filippo Perciabosco | A process for the purging of skins and hides in tanning |
Also Published As
| Publication number | Publication date |
|---|---|
| BE505164A (en) | 1952-12-19 |
| DK80394C (en) | 1956-01-09 |
| US2639967A (en) | 1953-05-26 |
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