NL6814946A - Recovery of formaldehyde from aqueous formaldehyde - streams - Google Patents
Recovery of formaldehyde from aqueous formaldehyde - streamsInfo
- Publication number
- NL6814946A NL6814946A NL6814946A NL6814946A NL6814946A NL 6814946 A NL6814946 A NL 6814946A NL 6814946 A NL6814946 A NL 6814946A NL 6814946 A NL6814946 A NL 6814946A NL 6814946 A NL6814946 A NL 6814946A
- Authority
- NL
- Netherlands
- Prior art keywords
- formaldehyde
- alcohol
- aqueous
- recovery
- temp
- Prior art date
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
- C07C45/78—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
- C07C45/83—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation by extractive distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Recovery of formaldehyde from aqueous formaldehyde streams. N5-. By (a) contacting the aqueous stream with a liquid alcohol having >4 C atoms at a temp. below the alcohol-formaldehyde dissociation temp., so that at least a part of the formaldehyde is extracted into the alcohol, (b) separating the alcohol from the aqueous tream, and (c) separating the alcohol and the formaldehyde by distillation at a temp. above the alcohol-formaldehyde dissociation temp. Recovery of formaldehyde from aqueous solutions is normally difficult because of the formation of hydrates of formaldehyde, such as methylene glycol and (CH2O)nH2O, but the use of the C6-10 aliphatic alcohol enables the formaldehyde to be effectively separated from the aqueous soln. in the form of a hemiformal, which can be subsequently dissociated into formaldehyde and alcohol.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6814946A NL6814946A (en) | 1968-10-18 | 1968-10-18 | Recovery of formaldehyde from aqueous formaldehyde - streams |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6814946A NL6814946A (en) | 1968-10-18 | 1968-10-18 | Recovery of formaldehyde from aqueous formaldehyde - streams |
Publications (1)
Publication Number | Publication Date |
---|---|
NL6814946A true NL6814946A (en) | 1970-04-21 |
Family
ID=19804958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL6814946A NL6814946A (en) | 1968-10-18 | 1968-10-18 | Recovery of formaldehyde from aqueous formaldehyde - streams |
Country Status (1)
Country | Link |
---|---|
NL (1) | NL6814946A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7338579B2 (en) | 1998-06-05 | 2008-03-04 | Lucite International Uk Limited | Dewatering process |
CN104710292A (en) * | 2015-03-24 | 2015-06-17 | 江苏凯茂石化科技有限公司 | Method for refining anhydrous pure formaldehyde gas and process device |
-
1968
- 1968-10-18 NL NL6814946A patent/NL6814946A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7338579B2 (en) | 1998-06-05 | 2008-03-04 | Lucite International Uk Limited | Dewatering process |
CN104710292A (en) * | 2015-03-24 | 2015-06-17 | 江苏凯茂石化科技有限公司 | Method for refining anhydrous pure formaldehyde gas and process device |
CN104710292B (en) * | 2015-03-24 | 2017-06-06 | 江苏凯茂石化科技有限公司 | A kind of process for purification and process unit of anhydrous pure formaldehyde gas |
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