GB1453766A - Production of concentrated aqueous solutions of formaldehyde - Google Patents
Production of concentrated aqueous solutions of formaldehydeInfo
- Publication number
- GB1453766A GB1453766A GB765074A GB765074A GB1453766A GB 1453766 A GB1453766 A GB 1453766A GB 765074 A GB765074 A GB 765074A GB 765074 A GB765074 A GB 765074A GB 1453766 A GB1453766 A GB 1453766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- absorption
- column
- mixture
- formaldehyde
- stage
- 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
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group
-
- 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
- C07C45/783—Separation; Purification; Stabilisation; Use of additives by gas-liquid treatment, e.g. by gas-liquid absorption
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1453766 Formaldehyde BASF AG 20 Feb 1974 [21 Feb 1973] 7650/74 Heading C2C In a process for the manufacture of a concentrated aqueous solution of formaldehyde by oxidative dehydrogenation of methanol with pure oxygen or a gas containing free oxygen in the presence of a silver catalyst and in the presence of steam at an elevated temperature and subsequent absorption of the formaldehyde thus produced in absorption apparatus, the reaction is effected with a starting mixture in the vapour state at a temperature from 650‹ to 780‹ C., which mixture contains from 0À44 to 1À8 moles of water per mole of methanol, the resulting reaction mixture, which is in the vapour state, is cooled and absorbed in two stages, the ratio of the length or number of plates of the absorption column(s) of the second absorption stage to that of the absorption column of the first absorption stage being from 1À1 : 1 to 8 :1, the reaction mixture being treated in the first absorption stage at a temperature of 45‹ to 80‹ C. and using a throughput of 2 to 5 tonnes of reaction mixture per hour per square meter of column cross-section (measured at the column inlet) in countercurrent with an absorption mixture which contains from 47 to 60% by weight of formaldehyde, from 35 to 52% by weight of water and from 0À5 to 5% by weight of methanol, based on the absorption mixture, the throughput of absorption mixture being 20 to 50 tonnes per hour per square meter of column cross-section (measured at the point of entry into the column), and the off-gas from the first absorption stage being treated in the second absorption stage at a temperature of 40‹ to 65‹ C. and using a throughput of 4 to 8 tonnes of off-gas per hour per square meter of column cross-section (measured at the point of entry into the first column of the second absorption stage) in countercurrent with a second absorption mixture which contains, measured in the first column of the second absorption stage from 10 to 40% by weight of formaldehyde, from 55 to 89% of water and from 0À5 to 5% by weight of methanol, based on the absorption mixture, using a throughput of 12 to 30 tonnes of the second absorption mixture per hour per square meter of column cross-section (measured at the point of entry into the first column of the second absorption stage), and formaldehyde, in the form of the solution thus produced, is withdrawn from both stages. The absorption liquids are suitably recirculated formaldehyde solutions from the particular stage, additional water being added as required. The second stage may use a multiplicity of columns, absorption liquid being passed from the bottom of one column to the top of the preceding column.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732308409 DE2308409A1 (en) | 1973-02-21 | 1973-02-21 | Process for the preparation of concentrated, aqueous solutions of formaldehyde |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1453766A true GB1453766A (en) | 1976-10-27 |
Family
ID=5872560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB765074A Expired GB1453766A (en) | 1973-02-21 | 1974-02-20 | Production of concentrated aqueous solutions of formaldehyde |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS49134615A (en) |
BE (1) | BE811186A (en) |
DE (1) | DE2308409A1 (en) |
FR (1) | FR2218313B1 (en) |
GB (1) | GB1453766A (en) |
IT (1) | IT1007229B (en) |
NL (1) | NL7401990A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2444586C3 (en) * | 1974-09-18 | 1986-07-10 | Basf Ag, 6700 Ludwigshafen | Process for the preparation of concentrated, aqueous solutions of formaldehyde |
ES2103193B1 (en) * | 1995-05-16 | 1998-04-01 | Patentes Novedades Sa | PROCEDURE FOR THE CONTINUOUS PREPARATION OF AQUEOUS FORMALDEHYDE SOLUTIONS. |
AT516530B1 (en) * | 2014-11-20 | 2018-02-15 | Johnson Matthey Plc | Process and apparatus for the preparation of an aqueous solution of formaldehyde |
-
1973
- 1973-02-21 DE DE19732308409 patent/DE2308409A1/en active Pending
-
1974
- 1974-02-04 IT IT2015474A patent/IT1007229B/en active
- 1974-02-08 FR FR7404244A patent/FR2218313B1/fr not_active Expired
- 1974-02-13 NL NL7401990A patent/NL7401990A/xx unknown
- 1974-02-18 BE BE141051A patent/BE811186A/en unknown
- 1974-02-20 GB GB765074A patent/GB1453766A/en not_active Expired
- 1974-02-21 JP JP2000774A patent/JPS49134615A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
NL7401990A (en) | 1974-08-23 |
FR2218313B1 (en) | 1977-09-09 |
JPS49134615A (en) | 1974-12-25 |
FR2218313A1 (en) | 1974-09-13 |
DE2308409A1 (en) | 1974-08-29 |
BE811186A (en) | 1974-08-19 |
IT1007229B (en) | 1976-10-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |