GB1190684A - Process for Preparing Paraformaldehyde. - Google Patents
Process for Preparing Paraformaldehyde.Info
- Publication number
- GB1190684A GB1190684A GB3267068A GB3267068A GB1190684A GB 1190684 A GB1190684 A GB 1190684A GB 3267068 A GB3267068 A GB 3267068A GB 3267068 A GB3267068 A GB 3267068A GB 1190684 A GB1190684 A GB 1190684A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paraformaldehyde
- curing
- july
- catalyst
- examples
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
- C08G2/08—Polymerisation of formaldehyde
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1,190,684. Preparing paraformaldehyde. SOC. ITALIANA RESINE S.p.A. 9 July, 1968 [17 July, 1967], No. 32670/68. Heading C3P. Paraformaldehyde is obtained by a process comprising (a) concentrating an aqueous formaldehyde solution until it contains between 75 to 93% formaldehyde, (b) solidifying the solution to form solid discrete particles, and (c) curing the outside layer of the solid particles in the presence of a catalyst, preferably incorporated in step (b), comprising basic organic compounds of a pK b between 2 and 6. A further catalyst component may be a basic organic substance of a pK b between 6 and 12. Examples of the former are methylamine, trimethylamine, triethylamine, tributylamine, ethylenediamine, piperidine, and 1,4-diazo-bicyclo-[2,2, 2] octane, while examples of the latter are pyridine, p - toluidine, phenyhydrazine, hydroxylamine, aniline and trimethyldodecylammonium hydroxide. The particulate paraformaldehyde may be obtained by spraying the concentrated solution, suitably with the curing catalyst being supplied during the spraying step. The concentration step may be performed in two stages with an intermediate curing step.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT805925 | 1967-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1190684A true GB1190684A (en) | 1970-05-06 |
Family
ID=11125700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3267068A Expired GB1190684A (en) | 1967-07-17 | 1968-07-09 | Process for Preparing Paraformaldehyde. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1190684A (en) |
-
1968
- 1968-07-09 GB GB3267068A patent/GB1190684A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |