GB462319A - Improvements in or relating to the manufacture of paraformaldehyde - Google Patents
Improvements in or relating to the manufacture of paraformaldehydeInfo
- Publication number
- GB462319A GB462319A GB2488335A GB2488335A GB462319A GB 462319 A GB462319 A GB 462319A GB 2488335 A GB2488335 A GB 2488335A GB 2488335 A GB2488335 A GB 2488335A GB 462319 A GB462319 A GB 462319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aldehyde
- formaldehyde
- per cent
- silica gel
- paraformaldehyde
- 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)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Solid compositions containing paraformaldehyde are obtained by mixing solutions of formaldehyde and of a silicate to form a homogeneous composition of silica gel and formaldehyde polymer. The formaldehyde concentration in the mixed solutions should be at least 10 and preferably 20 per cent. The mixture may be acidified and/or warmed to facilitate formation of the silica gel and polymerization of the aldehyde. The composite gel may be dehydrated at a temperature not exceeding 70 DEG C. to yield a dry friable product containing up to 95 per cent of aldehyde, which can be readily liberated by solution or volatilization. It is suitable for use as a fungicide, fumigant, or bactericide.ALSO:Solid compositions containing paraformaldehyde are obtained by mixing solutions of formaldehyde and of a silicate and acidifying or warming if necessary to produce polymerization of the aldehyde and formation of silica gel. The resulting composite gel may be dehydrated at temperatures up to 70 DEG C. to yield a dry friable product containing up to 95 per cent of aldehyde, which can be readily liberated by solution or volatilization. The product is useful as a fumigant, fungicide, or bactericide, e.g. in the sterilization of soil.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2488335A GB462319A (en) | 1935-09-06 | 1935-09-06 | Improvements in or relating to the manufacture of paraformaldehyde |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2488335A GB462319A (en) | 1935-09-06 | 1935-09-06 | Improvements in or relating to the manufacture of paraformaldehyde |
Publications (1)
Publication Number | Publication Date |
---|---|
GB462319A true GB462319A (en) | 1937-03-08 |
Family
ID=10218750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2488335A Expired GB462319A (en) | 1935-09-06 | 1935-09-06 | Improvements in or relating to the manufacture of paraformaldehyde |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB462319A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2187219A1 (en) * | 1972-06-12 | 1974-01-18 | Celanese Canada Ltd | |
US4330474A (en) * | 1978-06-26 | 1982-05-18 | Chemische Werke Huels, A.G. | Process for the manufacture of cyclic acetals of aliphatic aldehydes |
-
1935
- 1935-09-06 GB GB2488335A patent/GB462319A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2187219A1 (en) * | 1972-06-12 | 1974-01-18 | Celanese Canada Ltd | |
US4330474A (en) * | 1978-06-26 | 1982-05-18 | Chemische Werke Huels, A.G. | Process for the manufacture of cyclic acetals of aliphatic aldehydes |
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