DE219163C - - Google Patents
Info
- Publication number
- DE219163C DE219163C DENDAT219163D DE219163DA DE219163C DE 219163 C DE219163 C DE 219163C DE NDAT219163 D DENDAT219163 D DE NDAT219163D DE 219163D A DE219163D A DE 219163DA DE 219163 C DE219163 C DE 219163C
- Authority
- DE
- Germany
- Prior art keywords
- cellulose
- formic acid
- acid
- zinc chloride
- mixture
- 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 claims description 15
- 229920002678 cellulose Polymers 0.000 claims description 8
- 239000001913 cellulose Substances 0.000 claims description 7
- 235000019253 formic acid Nutrition 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- JIAARYAFYJHUJI-UHFFFAOYSA-L Zinc chloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 4
- 235000005074 zinc chloride Nutrition 0.000 claims description 4
- 239000011592 zinc chloride Substances 0.000 claims description 4
- 150000004675 formic acid derivatives Chemical class 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 229920000875 Dissolving pulp Polymers 0.000 claims 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- WFDIJRYMOXRFFG-UHFFFAOYSA-N acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 2
- 238000006640 acetylation reaction Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- OMLKPIIYNUNCMY-UHFFFAOYSA-N formic acid;sulfuric acid Chemical compound OC=O.OS(O)(=O)=O OMLKPIIYNUNCMY-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/04—Cellulose formate
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
PATENTSCHRIFTPATENT LETTERING
- JVl 219163 -KLASSE 12 o. GRUPPE - JVl 219163 - CLASS 12 or GROUP
Patentiert im Deutschen Reiche vom 20. Dezember 1907 ab.Patented in the German Empire on December 20, 1907.
Es ist bekannt, daß sich Cellulose in Ameisensäure auflöst, wenn zu der Ameisensäure Schwefelsäure oder Salzsäure zugefügt wird. Die Wiedergewinnung eines derartigen Gemisches von anorganischer Säure und Ameisensäure bereitet Schwierigkeiten, und die Lösung der Cellulose in diesem Gemisch ist infolge der Anwesenheit der starken anorganischen Säure verhältnismäßig rascher Zersetzung bzw.It is known that cellulose dissolves in formic acid when added to formic acid Sulfuric acid or hydrochloric acid is added. The recovery of such a mixture of inorganic acid and formic acid causes difficulties, and the solution the cellulose in this mixture is due to the presence of the strong inorganic Acid decomposes relatively quickly or
ίο weitergehender Veränderungunterworfen, welche die Verwendung dieser Lösung zur Kunstseideherstellung entweder ganz unmöglich macht oder nur schwierig und mit großen Verlusten gestattet. Es wurde nun gefunden, daß man die erwähnten anorganischen Säuren durch Zinkchlorid ersetzen kann, wobei länger haltbare Celluloseesterlösungen gewonnen werden und eine einfache Regeneration der unverbrauchten Ameisensäure durch Destillation möglich ist.ίο subject to further change, which makes the use of this solution for rayon production either completely impossible or only difficult and with large Losses allowed. It has now been found that the inorganic acids mentioned can be used can be replaced by zinc chloride, with longer-lasting cellulose ester solutions being obtained and a simple regeneration of the unused formic acid by distillation is possible.
Die Verwendung von Chlorzink bei der Acetylierung von Cellulose kann insofern nicht als analoges Verfahren angesehen werden, als bei der Acetylierung nicht Essigsäure, sondern Essigsäureanhydrid wirksam ist.The use of zinc chloride in the acetylation of cellulose is therefore not possible be regarded as an analogous process, as in the acetylation not acetic acid, but Acetic anhydride is effective.
In 100 Teilen konzentrierter Ameisensäure löst man etwa 15 bis 30 Teile Zinkchlorid auf. In diese Lösung bringt man Baumwolle oder Cellulose, welche sich in der Kälte allmählich, rascher durch Erwärmen löst, und zwar unter Bildung eines Gemisches verschiedener Celluloseformiate, d. h. von Cellülosemono-, -di- und -triformiaten, hauptsächlich aber des letzteren.About 15 to 30 parts of zinc chloride are dissolved in 100 parts of concentrated formic acid. Cotton or cellulose is put into this solution, which gradually dissolves in the cold, dissolves more quickly by heating, with the formation of a mixture of different cellulose formates, d. H. of cellulose mono-, di- and triformates, but mainly of the latter.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE219163C true DE219163C (en) |
Family
ID=480314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT219163D Active DE219163C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE219163C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE748727C (en) * | 1936-05-11 | 1944-11-09 | Process for the production of molded articles from cellulose formylation mixtures |
-
0
- DE DENDAT219163D patent/DE219163C/de active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE748727C (en) * | 1936-05-11 | 1944-11-09 | Process for the production of molded articles from cellulose formylation mixtures |
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