GB621639A - Improvements in or relating to the refining of tar acids - Google Patents
Improvements in or relating to the refining of tar acidsInfo
- Publication number
- GB621639A GB621639A GB95447A GB95447A GB621639A GB 621639 A GB621639 A GB 621639A GB 95447 A GB95447 A GB 95447A GB 95447 A GB95447 A GB 95447A GB 621639 A GB621639 A GB 621639A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- borax
- tar
- acids
- tar acids
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C1/00—Working-up tar
- C10C1/18—Working-up tar by extraction with selective solvents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Impurities which cause discoloration of tar acids, mainly catechol derivatives, are removed by washing with a solution of boric acid or a borate and then subjecting the tar acids to mild oxidation by passing an oxygen-containing gas therethrough. Preferably, a borax solution is used containing either less than 5 per cent or more than 10 per cent of borax. A suitable solution contains 15 per cent of borax and is used at 50 DEG C. The washing is carried out under alkaline conditions. Catechol derivatives may be recovered from the used borax solution. After washing with boric acid or a borate, the tar acid may be oxidized by heating to 80 DEG C. in a current of air or oxygen advantageously in the presence of an oxidation catalyst such as alkaline permanganate or oxides or organic salts such as naphthenates or oleates of various metals, e.g. cobalt nickel manganese or lead. In examples: (1) tar acids are washed with a solution of boric acid in sodium hydroxide and the washed acids are air blown in the presence of alkaline permanganate and (2) tar acids are washed with borax solution and air blown in the absence of catalysts. Specification 363,330 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB95447A GB621639A (en) | 1947-01-10 | 1947-01-10 | Improvements in or relating to the refining of tar acids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB95447A GB621639A (en) | 1947-01-10 | 1947-01-10 | Improvements in or relating to the refining of tar acids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB621639A true GB621639A (en) | 1949-04-13 |
Family
ID=9713420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB95447A Expired GB621639A (en) | 1947-01-10 | 1947-01-10 | Improvements in or relating to the refining of tar acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB621639A (en) |
-
1947
- 1947-01-10 GB GB95447A patent/GB621639A/en not_active Expired
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