CH100320A - Process for the production of solid formaldehyde solutions. - Google Patents
Process for the production of solid formaldehyde solutions.Info
- Publication number
- CH100320A CH100320A CH100320DA CH100320A CH 100320 A CH100320 A CH 100320A CH 100320D A CH100320D A CH 100320DA CH 100320 A CH100320 A CH 100320A
- Authority
- CH
- Switzerland
- Prior art keywords
- formaldehyde
- solution
- lactic acid
- production
- acid lime
- 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
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Description
Verfahren zur Herstellung fester Formaldehydlösungen. Es wurde die bemerkenswerte Beobach tung gemacht, dass Lösungen von milchsaurem Kalk in hervorragendem Masse geeignet sind, Formaldehyd aufzunehmen, beim Erstarren festzuhalten und bei Berührung mit Wasser abzugeben. Man erhält also mit Hilfe von milchsaurem Kalk ein festes Präparat, das den Formaldehyd in unveränderter, nicht po- lymeriserter Form enthält.
Zur Herstellung eines festen Präparates aus milchsaurem Kalk und Formaldehyd ver fährt man beispielsweise wie folgt: In 500 gr Formaldehydlösung mit zirka 35 Gewichtsprozent Formaldehyd löst man etwas mehr als die gleiche Menge, also etwa 600 bis 700 Gramm gepulverten milchsauren Kalk unter Erwärmen am Rückflusskühler. Die Temperatur soll hierbei<B>90'</B> C möglichst nicht übersteigen. Man erhält so eine farb lose, sirupartige Flüssigkeit, die nach mehr stündigem Stehen in der Kälte zu einer weissen, harten, kristallinischen Masse er starrt, die in Wasser leicht löslich ist und in angewärmtem Wasser den Formaldehyd leicht abspaltet.
Der Formaldehydgehalt dieser Masse wurde in frischem Zustande zu etwa 12 % ermittelt.
Man kann auch so verfahren, dass man milchsauren Kalk in einer geringen Menge warmen Wassers löst und .dann Formaldehyd einträgt, entweder durch Einleiten von Form aldehydgas oder vorteilhafter durch Zusatz einer wässerigen Formaldehydlösung, wonach man .die Lösung zum Erstarren bringt. Man kann das Eintragen auch in der Wärme vor nehmen.
Das Erzeugnis ist, in verschlossener Flasche aufbewahrt, gut haltbar und lässt sich in gepulvertem Zustande zu den verschieden artigsten pharmazeutischen Präparaten ver arbeiten, so zum Beispiel in Vermischung mit Milchzucker, Mehl, Kalk und ähnlichem Füll material zu Tabletten oder Pillen, die als Desinfiziens Verwendung finden können.
Process for the production of solid formaldehyde solutions. The remarkable observation was made that solutions of lactic acid lime are excellently suited to absorb formaldehyde, to hold it when it solidifies and to release it when it comes into contact with water. With the help of lactic acid lime, a solid preparation is obtained which contains the formaldehyde in unchanged, non-polymerized form.
To produce a solid preparation from lactic acid lime and formaldehyde, proceed as follows, for example: In 500 g formaldehyde solution with about 35 percent by weight of formaldehyde, slightly more than the same amount, i.e. about 600 to 700 grams of powdered lactic acid lime, is dissolved by heating on the reflux condenser. The temperature should not exceed <B> 90 '</B> C if possible. The result is a colorless, syrupy liquid which, after standing in the cold for several hours, solidifies into a white, hard, crystalline mass which is easily soluble in water and easily splits off formaldehyde in warmed water.
The formaldehyde content of this mass was determined to be about 12% in the fresh state.
One can also proceed in such a way that one dissolves lactic acid lime in a small amount of warm water and then introduces formaldehyde, either by introducing formaldehyde gas or more advantageously by adding an aqueous formaldehyde solution, after which one brings the solution to solidify. You can also do the entry in the warm.
The product is well-preserved when stored in a sealed bottle and can be processed into a wide variety of pharmaceutical preparations in powdered form, for example when mixed with lactose, flour, lime and similar filling material to make tablets or pills that are used as disinfectants can find.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH100320T | 1921-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH100320A true CH100320A (en) | 1923-07-16 |
Family
ID=4358593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH100320D CH100320A (en) | 1921-12-08 | 1921-12-08 | Process for the production of solid formaldehyde solutions. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH100320A (en) |
-
1921
- 1921-12-08 CH CH100320D patent/CH100320A/en unknown
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