GB462319A - Improvements in or relating to the manufacture of paraformaldehyde - Google Patents

Improvements in or relating to the manufacture of paraformaldehyde

Info

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
Application number
GB2488335A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WILBIE SCOTT HINEGARDNER
EIDP Inc
Original Assignee
WILBIE SCOTT HINEGARDNER
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WILBIE SCOTT HINEGARDNER, EI Du Pont de Nemours and Co filed Critical WILBIE SCOTT HINEGARDNER
Priority to GB2488335A priority Critical patent/GB462319A/en
Publication of GB462319A publication Critical patent/GB462319A/en
Expired legal-status Critical Current

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.
GB2488335A 1935-09-06 1935-09-06 Improvements in or relating to the manufacture of paraformaldehyde Expired GB462319A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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