DE247490C - - Google Patents
Info
- Publication number
- DE247490C DE247490C DENDAT247490D DE247490DA DE247490C DE 247490 C DE247490 C DE 247490C DE NDAT247490 D DENDAT247490 D DE NDAT247490D DE 247490D A DE247490D A DE 247490DA DE 247490 C DE247490 C DE 247490C
- Authority
- DE
- Germany
- Prior art keywords
- technical
- formate
- sulfuric acid
- formic acid
- concentrated
- 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.)
- Active
Links
- BDAGIHXWWSANSR-UHFFFAOYSA-N formic acid Chemical compound OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 12
- 235000019253 formic acid Nutrition 0.000 description 9
- BDAGIHXWWSANSR-UHFFFAOYSA-M methanoate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 150000004675 formic acid derivatives Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/02—Preparation of carboxylic acids or their salts, halides or anhydrides from salts of carboxylic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Extraction Or Liquid Replacement (AREA)
Description
Bisher ist es unmöglich gewesen, durch direkte Umsetzung zwischen Formiaten und Säuren Ameisensäure in befriedigender Ausbeute zu erhalten, da diese Umsetzungen mit. teilweiser Zersetzung der Ameisensäure verbunden sind. Gemäß Patentschrift 169730 werden daher die Formiate zunächst in Ameisensäure gelöst und diese Lösung dann mit Schwefelsäure zersetzt.So far it has been impossible to convert directly between formats and Acids to obtain formic acid in satisfactory yield, since these reactions with. partial decomposition of formic acid. According to patent 169730 Therefore, the formates are first dissolved in formic acid and this solution then with Sulfuric acid decomposes.
)io Es wurde nun aber gefunden, daß doch ; eine direkte Gewinnung konzentrierter Ameisensäure aus Formiaten und Säuren, insbesondere ! konzentrierter Schwefelsäure, möglich und technisch mit höchster Ausbeute ausführbar ist, wenn man zu dem vorher am besten im Vakuum entwässerten technischen Formiat konzentrierte Schwefelsäure allmählich einfließen läßt und die entbundene Ameisensäure destilliert, am besten im Vakuum.) io But it has now been found that ; a direct extraction of concentrated formic acid from formates and acids, especially! concentrated sulfuric acid, is possible and technically feasible with the highest yield if concentrated sulfuric acid is allowed to flow gradually into the technical formate, which is previously best dehydrated in vacuo, and the formic acid which has been released is distilled, preferably in vacuo.
'20 Bekanntlich ist technisches Formiat stark hygroskopisch, es enthält daher stets mehr oder weniger Wasser, welches beim Zufließen konzentrierter Schwefelsäure starke lokale Überhitzung und dadurch Zersetzung der in Freiheit gesetzten Ameisensäure verursacht; außerdem verdünnt das vorhandene und das bei dieser Zersetzung entstehende Wasser die'20 As you know, technical formate is strong hygroscopic, it therefore always contains more or less water, which when flowing in concentrated sulfuric acid strong local overheating and thus decomposition of the in Formic acid set free; moreover thins the existing and that water formed during this decomposition
4... entstehende Ameisensäure.4 ... resulting formic acid.
Daher wird vor dem Zugeben der Schwefelsäure das technische Formiat entwässert, am besten unter Vakuum.Therefore, the technical formate is dehydrated before adding the sulfuric acid, on best under vacuum.
Das allmähliche Einfließenlassen konzentrierter Schwefelsäure zu dem vorher unter Vakuum entwässerten technischen Formiat geschieht selbstverständlich unter kräftigem Rühren und, wenn nötig, unter Kühlen oder Erwärmen.Gradually pouring in concentrated sulfuric acid to the one below Vacuum dewatered technical formate takes place naturally under vigorous Stir and, if necessary, with cooling or heating.
Durch das unter kräftigem Umrühren vorsichgehende Einfließenlassen der konzentrierten Schwefelsäure in das vorher unter Vakuum entwässerte technische Formiat wird vor der Entbindung der Ameisensäure zunächst alles im technischen Formiat stets vorhandene freie Alkali neutralisiert und dadurch sekundäre Prozesse verhindert.By carefully pouring in the concentrated Sulfuric acid in the technical formate, which has previously been dehydrated under vacuum, is first of all before the formic acid is released all free alkali always present in the technical formate is neutralized and thereby prevents secondary processes.
Ρλ'γ£ nt- Anspruch:Ρλ'γ £ nt- claim:
Verfahren zur technischen Gewinnung konzentrierter Ameisensäure direkt aus technischem Formiat und konzentrierter Schwefelsäure, dadurch gekennzeichnet, daß technisches Formiat zunächst am besten im Vakuum entwässert und darauf durch allmähliches Einfließenlassen konzentrierter Schwefelsäure zersetzt wird.Process for the technical production of concentrated formic acid directly from technical formate and concentrated sulfuric acid, characterized in that Technical formate is best dewatered in a vacuum and then more concentrated by gradually flowing in Sulfuric acid is decomposed.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE247490C true DE247490C (en) |
Family
ID=506273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT247490D Active DE247490C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE247490C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5529704A (en) * | 1992-04-10 | 1996-06-25 | Hoechst Aktiengesellschaft | Leather fat-liquoring agents |
| US6575659B1 (en) * | 1999-02-08 | 2003-06-10 | Atec-Weiss Gmbh & Co Kg | Conical screw connection for multi-disk shaft couplings |
-
0
- DE DENDAT247490D patent/DE247490C/de active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5529704A (en) * | 1992-04-10 | 1996-06-25 | Hoechst Aktiengesellschaft | Leather fat-liquoring agents |
| US6575659B1 (en) * | 1999-02-08 | 2003-06-10 | Atec-Weiss Gmbh & Co Kg | Conical screw connection for multi-disk shaft couplings |
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