BE393099A - - Google Patents
Info
- Publication number
- BE393099A BE393099A BE393099DA BE393099A BE 393099 A BE393099 A BE 393099A BE 393099D A BE393099D A BE 393099DA BE 393099 A BE393099 A BE 393099A
- Authority
- BE
- Belgium
- Prior art keywords
- iron
- chromium
- solutions
- parts
- acid
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 150000001844 chromium Chemical class 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 230000002378 acidificating Effects 0.000 claims description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L Iron(II) sulfate Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N Iron(III) oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H Iron(III) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 229910000460 iron oxide Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- KVBGVZZKJNLNJU-UHFFFAOYSA-N naphthalene-2-sulfonic acid Chemical compound C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 KVBGVZZKJNLNJU-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0009—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
<Desc/Clms Page number 1>
Procédé pour l'élimination de fer des solutions de sels de chrome acides.
Les sels de chrome s'emploient principalement dans l'industrie du cuir. Pour leur fabrication technique à partir de matières premières ferrugineuses, en évitant la production intermédiaire coûteuse de bichromate, on a déjà fait les propositions les plus variées, sans qu'on eût réussi toutefois à obtenir des sels complètement exempts de fer. Ainsi, le procédé, le meilleur jusqu'à présent, con- sistant à préparer de l'alun de chrome à partir de ferrochrome donne des produits qui contiennent plus ou moins de fer. Mais,une teneur en fer est souvent très désagréable dans le tannage au chrome, notamment dans les cas ou il s'agit de clarifier du cuir chrome au moyen d'agents tannants synthétiques.
Or, on a trouvé qu'on pouvait réaliser d'une
<Desc/Clms Page number 2>
manière toute simple une élimination quantitative du fe r des solutions -de sels de chrome ferrugineuses, à la condition que le fe r s'y trouve à l'état bivalent, si l'on traite ces
EMI2.1
solutions à chaud avec de l'acide 3-naphtalinesulfOnique, ou ses sels solubles, en faible excès. Pans des solutions sels ferriques, le sel ferrique devra d'abord être réduit à l'état ferreux.
Par cette méthode perfectionnée, le fer est élimine de la solution sous forme du sel ferreux insoluble de l'acide ss-naphtalinesulfonique
EMI2.2
Comme, à la place de l'aciQe;8-naphtalinesulfonique libre, on peut aussi employer ses sels solubles, il est possible de transformer les quantités obtenues du sel ferreux insoluble avec des carbonates alcalins en sels alcalins solubles et de les ramener au cycle d'opérations.
E x e m p 1 e .
-------------------
On introduit dans un mélange de 500 parties d'acide sulfurique à 93% et de 500 parties d'eau, à 80 C, 200 parties de ferrochrome. Puis, on chauffe pendant 5 heures à 110 c la liqueur est portée par addition d'eau à 1600 parties et abandonnée à la cristallisation. Apres 48 heures, on sépare par filtration le sulfate ferreux qui s'est formé. Par l'analyse, on obtient 1450 parties d'une solution de chrome avec 337 parties d'acide combiné, 65 parties d'acide libre, 150 parties d'oxyde de chrome et 47 parties d'oxyde ferrique, le composé de fer se trouvant dans la solution à l'état bivalent. On ajoute alors, à la température de cuisson, 256 parties d'acide ss-napthaline- sulfonique à 100%, dissoutes dans trois fois la quantité d'eau.
Lors du refroidissement, le fer se sépare quantitativement sous forme de sel ferreux de l'acide
<Desc/Clms Page number 3>
ss-naphtalinsulfoneique Après filtration et ajustage de la liqueur à la basicité désirée, on obtient une solution de chrome exempte de fer, prête pour le tannage.
Si l'on emploie, à la place de ferrochrome, un limon de chrome ferrugineux comme matière première, on procède de la manière indiquée ci-dessus, sauf qu'après dissolution dans l'acide sulfurique, on réduit le sulfate ferrique de manière connue en sulfate ferreux.
Résume .
**ATTENTION** fin du champ DESC peut contenir debut de CLMS **.
<Desc / Clms Page number 1>
Process for removing iron from acidic chromium salt solutions.
Chromium salts are mainly used in the leather industry. For their technical manufacture from ferruginous raw materials, avoiding the costly intermediate production of dichromate, the most varied proposals have already been made, without however having succeeded in obtaining salts completely free of iron. Thus, the best method so far of preparing chromium alum from ferrochrome results in products which contain more or less iron. However, an iron content is often very unpleasant in chrome tanning, particularly in cases where it is a question of clarifying chrome leather by means of synthetic tanning agents.
However, we found that we could achieve
<Desc / Clms Page number 2>
in a very simple way, a quantitative elimination of iron from ferruginous chromium salt solutions, on condition that the iron is present therein in the bivalent state, if these
EMI2.1
hot solutions with 3-naphthalinesulfOnic acid, or its soluble salts, in small excess. In ferric salt solutions, the ferric salt must first be reduced to the ferrous state.
By this improved method, iron is removed from solution as the insoluble ferrous salt of s-naphthalinesulfonic acid.
EMI2.2
As, instead of the free 8-naphthalinesulfonic acid, its soluble salts can also be used, it is possible to transform the quantities obtained from the insoluble ferrous salt with alkali carbonates into soluble alkali salts and to bring them back to the d cycle. 'operations.
E x e m p 1 e.
-------------------
200 parts of ferrochrome are introduced into a mixture of 500 parts of 93% sulfuric acid and 500 parts of water at 80 ° C. Then, the liquor is heated for 5 hours at 110 ° C. by adding water to 1600 parts and left to crystallize. After 48 hours, the ferrous sulfate which has formed is filtered off. By analysis, 1450 parts of a solution of chromium are obtained with 337 parts of combined acid, 65 parts of free acid, 150 parts of chromium oxide and 47 parts of ferric oxide, the iron compound is found in solution in the bivalent state. 256 parts of 100% ss-napthalinsulfonic acid, dissolved in three times the amount of water, are then added at the cooking temperature.
On cooling, iron separates quantitatively as a ferrous salt from the acid
<Desc / Clms Page number 3>
ss-naphthalinsulphone After filtration and adjustment of the liquor to the desired basicity, an iron-free solution of chromium is obtained, ready for tanning.
If, instead of ferrochrome, a ferruginous chromium silt is used as a raw material, the procedure is as indicated above, except that after dissolution in sulfuric acid, the ferric sulphate is reduced in a known manner. in ferrous sulfate.
Summary .
** ATTENTION ** end of DESC field can contain start of CLMS **.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE393099A true BE393099A (en) |
Family
ID=60598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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BE393099D BE393099A (en) |
Country Status (1)
Country | Link |
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BE (1) | BE393099A (en) |
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- BE BE393099D patent/BE393099A/fr unknown
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