BE455941A - Skin deliming process - Google Patents
Skin deliming processInfo
- Publication number
- BE455941A BE455941A BE455941A BE455941A BE455941A BE 455941 A BE455941 A BE 455941A BE 455941 A BE455941 A BE 455941A BE 455941 A BE455941 A BE 455941A BE 455941 A BE455941 A BE 455941A
- Authority
- BE
- Belgium
- Prior art keywords
- distillation
- skin
- deliming
- distillate
- lignite
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 5
- 238000004821 distillation Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003077 lignite Substances 0.000 claims description 6
- 150000007524 organic acids Chemical class 0.000 claims description 4
- 235000005985 organic acids Nutrition 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 150000003839 salts Chemical group 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 150000007513 acids Chemical class 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000002425 soil liming agent Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000003643 water by type 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
- 229910021529 ammonia Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 244000309466 calf Species 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005303 weighing Methods 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Description
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Procédé de déchaulage des peaux planées
On a trouvé que les eaux de distillation des distilleries de lignite pouvaient être employées comme agent de déchaulage dans l'industrie du cuir par suite de leur teneur en acides organiques, en particulier en acide acétique. Les eaux de distillation s'obtiennent ainsi qu'on le sait en grandes quantités au cours de la distillation des lignites. Jusqu'à présenta elles sont pour ainsi dire sans valeur et leur placement soulève souvent de grosses difficultés.
La valorisation comme agent de déchaulage se fait avantageusement de telle sorte que les eaux de distillation sont tout d'abord neutralisées et évaporées, les phénols qui y sont contenus pouvant être récupérés et puis les acides organiques sont obtenus sous forme d'un distillat aqueux à partir du mélange de sels obtenus, par acidification et distillation. Le distillat aqueux' peut alors servir comme agent de déchaulage. A titre d'exemple, la neutralisation des eaux de distillation peut se faire par de la chaux éteinte après quoi les sels de chaux obtenus après évaporation sont acidifiés à l'aide d'acide sulfurique et les acides organiques libérés sont séparés par distillation du gypse formé.
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Le procédé de déchaulage peut par exemple s'effectuer de la façon suivante :
Une peau de veau salée d'un poids de 3,6 Kgs est trempée comme d'habitude. Apres le trempage, la peau de veau est enchaussenée, abandonnée durant la nuit, épilée le lendemain matin et ensuite traitée au pelein durant 4 jours à la chaux blanche comme d'habitude. Après l'action du pelein, les peaux plamees sont rincées durant une heure à 20 et puis écharnées. Vient ensuite le traitoment par le distillat acide provenant de l'eau de distillation de lignite, et ce avec 90 gr. de distillat d'eau de distillation de lignite pour 3,6 Kgs de peau plamée.
Le distillat est tout d'abord. avantageusement amené à un pH de 3,5 par une addition d'ammoniaque, La teneur en acide du distillat atteindra avantageusement 30 % calculé en acide acétique. Ceci peut s'obtenir par une conduite appropriée de la distillation. Le déchaulage s'exécute avec 500 % de bain dans le foulon à 28-30µ. Apres un déchaulage de 1 1/2 h. la peau plamée est tombée. Au cas où, aux parties plus épaisses de la peau apparaît encore une coloration rouge par la phénolphtaléine on ajoute encore 45 gr. de distillat. La peau plamée séjourne alors dans le bain de déchaulage durant' la nuit et est complètement déchaulee le lendemain matin. Le pH du bain de dé- chaulage use est 6,4.
Les peaux plamées dechaulees au distillat d'eau de distillation de lignite ne se distinguent en rien des peaux plamees déchaulées au moyen des agents de d.échaulage connus, par exemple l'acideformique. L'eau :le distillation de lignite quasi sans valeur jusqu'ici est ainsi, grâce au nouveau procédé, amenée à une valorisation avantageuse.
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Liming process for flat skins
It has been found that the distillation waters of lignite distilleries can be used as a liming agent in the leather industry due to their content of organic acids, in particular acetic acid. As is known, the distillation waters are obtained in large quantities during the distillation of lignites. So far they have been virtually worthless and their placement often raises great difficulties.
The recovery as a deliming agent is advantageously carried out such that the distillation water is first of all neutralized and evaporated, the phenols which are contained therein being able to be recovered and then the organic acids are obtained in the form of an aqueous distillate at from the mixture of salts obtained, by acidification and distillation. The aqueous distillate can then be used as a liming agent. For example, the neutralization of the distillation water can be done by slaked lime after which the lime salts obtained after evaporation are acidified using sulfuric acid and the organic acids released are separated by distillation of the gypsum. form.
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The deliming process can for example be carried out as follows:
A salted calf skin weighing 3.6 Kgs is soaked as usual. After soaking, the calfskin is chained, abandoned overnight, shaved the next morning and then treated with pelein for 4 days with white lime as usual. After the action of the pelein, the flattened skins are rinsed for an hour at 20 and then sliced. Then comes the treatment with the acid distillate from the lignite distillation water, and this with 90 gr. of distillate of lignite distillation water for 3.6 Kgs of plucked skin.
The distillate is first. advantageously brought to a pH of 3.5 by adding ammonia, the acid content of the distillate will advantageously reach 30% calculated as acetic acid. This can be achieved by proper conduct of the distillation. Liming is carried out with 500% bath in the fuller at 28-30µ. After deliming for 1 1/2 h. the flattened skin fell off. If, in thicker parts of the skin there is still a red coloring by phenolphthalein, 45 gr. of distillate. The flattened skin then stays in the liming bath overnight and is completely limed the next morning. The pH of the used liming bath is 6.4.
The flaked skins limed with lignite distillate water from the distillation do not differ in any way from the flaked skins limed by means of known liming agents, for example formic acid. Water: the distillation of lignite almost worthless until now is thus, thanks to the new process, brought to an advantageous recovery.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB5853A DE863839C (en) | 1942-12-10 | 1942-12-10 | Process for de-liming bare stones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE455941A true BE455941A (en) | 1944-06-30 |
Family
ID=89942966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE455941A BE455941A (en) | 1942-12-10 | 1944-05-24 | Skin deliming process |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE455941A (en) |
| DE (1) | DE863839C (en) |
| FR (1) | FR904475A (en) |
-
1942
- 1942-12-10 DE DEB5853A patent/DE863839C/en not_active Expired
-
1944
- 1944-05-20 FR FR904475D patent/FR904475A/en not_active Expired
- 1944-05-24 BE BE455941A patent/BE455941A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE863839C (en) | 1953-01-26 |
| FR904475A (en) | 1945-11-07 |
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