GB342119A - Improvements in or relating to the extraction of formic acid from the residual lye from the purification of cellulose - Google Patents
Improvements in or relating to the extraction of formic acid from the residual lye from the purification of celluloseInfo
- Publication number
- GB342119A GB342119A GB2237/30A GB223730A GB342119A GB 342119 A GB342119 A GB 342119A GB 2237/30 A GB2237/30 A GB 2237/30A GB 223730 A GB223730 A GB 223730A GB 342119 A GB342119 A GB 342119A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- acid
- formic acid
- purification
- relating
- 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
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
The liquor which has been used for purifying cellulose by the process of Specification 318,868, or reduced pressure, while vapours of nitric acid, [Class 2 (ii), Cellulose &c.], is treated with an acid or acid salt such as sulphuric acid or sodium bisulphite and formic acid is distilled off. Preferably concentrated lye is used. Sodium sulphate is recovered from the residue by lixiviation before or after calcination.ALSO:Formic acid is obtained from the liquor which has been used for purifying cellulose by the process of Specification 318,868, [Class 2 (ii), Cellulose &c.], by adding an acid or acid salt such as sulphuric acid or sodium bisulphate, and distilling. Preferably concentrated lye is used. Sodium sulphate is recovered from the residue by lixiviation before or after calcination.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR342119X | 1929-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB342119A true GB342119A (en) | 1931-01-29 |
Family
ID=8891966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2237/30A Expired GB342119A (en) | 1929-11-30 | 1930-01-22 | Improvements in or relating to the extraction of formic acid from the residual lye from the purification of cellulose |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB342119A (en) |
-
1930
- 1930-01-22 GB GB2237/30A patent/GB342119A/en not_active Expired
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