US1699250A - Bleaching montan wax - Google Patents

Bleaching montan wax Download PDF

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Publication number
US1699250A
US1699250A US260260A US26026028A US1699250A US 1699250 A US1699250 A US 1699250A US 260260 A US260260 A US 260260A US 26026028 A US26026028 A US 26026028A US 1699250 A US1699250 A US 1699250A
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montan wax
wax
bleaching
acid
solution
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US260260A
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Pungs Wilhelm
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IG Farbenindustrie AG
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IG Farbenindustrie AG
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G73/00—Recovery or refining of mineral waxes, e.g. montan wax

Definitions

  • This invention relates to the bleaching of Montan wax.
  • the chromic acid in this example may be replaced by a corresponding amount of a chromate.
  • 100 kilograms of deresinified Montan wax are heated with 400 kilo ams of 50 per cent acetic acid to about 102 .,'whereupon a solution of 7 5 kilograms of potassium bichromate or of 50 kilograms of chromic acid in 750 litres of 50 per cent acetic acid is run in while stirring, the temperature of themixture being maintained. The solution isbluish-green in colour after about 1 hours. The stirrer is now stopped and the greater part of the chromic salt solution drawn oil from under the Montan wax floating thereon after a short time. The mixture is then again heated to boiling and 7 50 litres of 50 per cent acetic acid containing 75 kilograms of potassium bichromate in solution are agaln added. After about 2% hours, about three quarters of the spent chromium salt is drawn off. 450 litres of 50 per cent acetic acid containing 45 kilograms of potassium bichromateare now added to the rest of the solution containing the Montan wax.
  • the bleaching is completed by boiling for further three hours with stirring. In this way an excellent light coloured wax is obtained.
  • a process for bleachingMontan wax which consists in treating the said wax with chromic acid in the presence of aqueous solutions of organic acids.
  • a process for bleaching Montan wax which consists in treating the said wax with chromic acid in the presence of aqueous acetic acid.
  • a process for bleaching Montan wax which consists in treating the said wax with an aqueous acetic acid solution of chromic acid at 102 C.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Patented Jan. 15, 1929.
UNITED STATES PATENT OFFICE.
WILHELI PUNGS, OF LUDWIGSHAFEN-ON-THE'RI-IINE, GERMANY, ASSIGNOR TO I. G.
FARBE'NINDUSTRIE AK'I'IENGESELLSCHAFT, OF FRANKFORT-ON-THE-MAIN, GER- MANY, A CORPORATION OF GERMANY.
BLEAGHING MONTAN WAX.
Ho Drawing. Application filed March 8, 1928, Serial No. 260,260, and in Germany March 11, 1927.
This invention relates to the bleaching of Montan wax.
A process is already known according to which Montan wax is bleached with chromic acid in glacial acetic acid. But glacial acetic acid has more the character of a solvent than of an acid, and it is therefore often difficult to initiate the reaction. On this account the process is very dangerous, since on the further addition of chromic acid, after the delay, the reaction usually begins very suddenly, in a violent, explosive manner.
I have now found that crude or deresinified Montan wax which are equivalents for the purposes of the present invention can be successfully bleached with chromic acid, it the operation be conducted in the presence of solutions of organic acids or sulfonic acids, these being included in the expression organic acids, such as acetic acid, benzene sulfonic acid and the like. It has been found that the bleaching proceeds in a milder manner and more uniformly in such solutions than, for example, in mineral acid solutions, so that the wax substance usually suffers no injurious chemical modification.
The following examples will further illustrate the nature of this invention but the invention is not restricted to these examples.
Ewample 1.
Earample 2.
150 kilograms of crude or deresinified Montan wax are finely distributed in 3500 litres of a solution of 45 parts by weight of benzolmonosulfonic acid in parts by weight of water, the mixture being stirred and heated to about 100 C. A concentrated aqueous solution of 225 kilograms of chromic acid is then slowly added, heating and stirring being continued. After from 2 to 3 hours a product is obtained which is as pale as that pbtained by operating in sulfuric acid soluion.
The chromic acid in this example may be replaced by a corresponding amount of a chromate.
Eazample 3.
100 kilograms of deresinified Montan wax are heated with 400 kilo ams of 50 per cent acetic acid to about 102 .,'whereupon a solution of 7 5 kilograms of potassium bichromate or of 50 kilograms of chromic acid in 750 litres of 50 per cent acetic acid is run in while stirring, the temperature of themixture being maintained. The solution isbluish-green in colour after about 1 hours. The stirrer is now stopped and the greater part of the chromic salt solution drawn oil from under the Montan wax floating thereon after a short time. The mixture is then again heated to boiling and 7 50 litres of 50 per cent acetic acid containing 75 kilograms of potassium bichromate in solution are agaln added. After about 2% hours, about three quarters of the spent chromium salt is drawn off. 450 litres of 50 per cent acetic acid containing 45 kilograms of potassium bichromateare now added to the rest of the solution containing the Montan wax.
The bleaching is completed by boiling for further three hours with stirring. In this way an excellent light coloured wax is obtained.
What I claim is:
1. A process for bleaching Montan wax,
which consists in treating the said wax with chromic acid in the presence of solution of organic acids. a
2. A process for bleachingMontan wax, which consists in treating the said wax with chromic acid in the presence of aqueous solutions of organic acids.
3. A process for bleaching Montan wax, which consists in treating the said wax with chromic acid in the presence of aqueous acetic acid.
4. A process for bleaching Montan wax, which consists in treating the said wax with an aqueous acetic acid solution of chromic acid at 102 C.
In testimony whereof I have hereunto set my hand.
WILHELM PUNGS.
US260260A 1927-03-11 1928-03-08 Bleaching montan wax Expired - Lifetime US1699250A (en)

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DE1699250X 1927-03-11

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