GB869764A - Process for rectifying a formaldehyde-containing solution - Google Patents
Process for rectifying a formaldehyde-containing solutionInfo
- Publication number
- GB869764A GB869764A GB3974/59A GB397459A GB869764A GB 869764 A GB869764 A GB 869764A GB 3974/59 A GB3974/59 A GB 3974/59A GB 397459 A GB397459 A GB 397459A GB 869764 A GB869764 A GB 869764A
- Authority
- GB
- United Kingdom
- Prior art keywords
- formaldehyde
- methanol
- formic acid
- water
- substantially free
- 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
- C07C47/00—Compounds having —CHO groups
- C07C47/02—Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen
- C07C47/04—Formaldehyde
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
- C07C45/72—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups
- C07C45/75—Reactions with formaldehyde
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C45/82—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Mixtures of formaldehyde, water and methanol substantially free from formic acid (removal of formic acid being effected by an anion-exchange resin) are rectified (see Group III) to obtain pure methanol overhead and a clear concentrated formaldehyde solution substantially free from formic acid and methanol as bottoms. The latter solution has a concentration of 65 to 85% formaldehyde and may be cooled to yield a linear formaldehyde polymer which is solid at room temperature and soluble in water.ALSO:Mixtures of formaldehyde, water and methanol substantially free from formic acid, containing 50% to 80% by weight of formaldehyde and a weight ratio of formaldehyde to water between 65:35 and 85:15, are rectified under top-of-tower pressures and temperatures of 160-660 mm. Hg. and 30 DEG -61 DEG C. with a methanol reflux ratio of 5:1 to 15:1, thereby distilling off substantially pure methanol overhead, and withdrawing as bottoms a clear concentrated formaldehyde solution substantially free from formic acid and methanol. Mixtures to be rectified may be those obtained from gases resulting from the catalytic oxidation at 450 DEG -700 DEG C. of gaseous mixtures of methanol and an oxygen-containing gas such as air, air and nitrogen, or air and steam, these gases being fractionally condensed at e.g. 55 DEG to 90 DEG C. or absorbed in a mixture of formaldehyde, water and methanol circulating at such temperatures. Any formic acid present is removed before rectification by treatment with an anion-exchange resin. The pure methanol obtained overhead may be used to prepare formaldehyde by vapour phase conversion as described above. The solution of formaldehyde obtained as bottoms has a concentration of 65 to 85% and can be cooled to yield a linear formaldehyde polymer which is solid at room temperature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP869764X | 1958-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB869764A true GB869764A (en) | 1961-06-07 |
Family
ID=13901886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3974/59A Expired GB869764A (en) | 1958-07-26 | 1959-02-04 | Process for rectifying a formaldehyde-containing solution |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB869764A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5898087A (en) * | 1996-03-20 | 1999-04-27 | Celanese International Corporation | Addition of amine to improve parafomaldehyde |
-
1959
- 1959-02-04 GB GB3974/59A patent/GB869764A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5898087A (en) * | 1996-03-20 | 1999-04-27 | Celanese International Corporation | Addition of amine to improve parafomaldehyde |
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