DE536914C - Process for the regeneration of the precipitating alkali solutions in the viscose luster industry - Google Patents
Process for the regeneration of the precipitating alkali solutions in the viscose luster industryInfo
- Publication number
- DE536914C DE536914C DEW78123D DEW0078123D DE536914C DE 536914 C DE536914 C DE 536914C DE W78123 D DEW78123 D DE W78123D DE W0078123 D DEW0078123 D DE W0078123D DE 536914 C DE536914 C DE 536914C
- Authority
- DE
- Germany
- Prior art keywords
- industry
- luster
- viscose
- regeneration
- alkali solutions
- 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/28—Purification; Separation
- C01D1/32—Purification; Separation by absorption or precipitation
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/02—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of cellulose, cellulose derivatives or proteins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Regenerierung der abfallenden Alkälilaugen der Viskoseglanzstoffindustrie Bei der Behandlung von Zellstoff mit mehr als 17°/oiger Natronlauge bildet sich ein aus der Natronverbindung der Alfacellulose bestehender, als Ausgangsstoff für die Viskoseindustrie direkt verwendbarer Rückstand, während die übrigen nicht spinnbaren Bestandteile des Zellstoffs gemeinsam mit den Farbstoffen, Gerbstoffen und Harzen in Lösung gehen. Die in den Abfallaugen enthaltenen Hexosane stellen neben einer geringen Menge von Pentosan eine lästige Verunreinigung der Laugen vor, welche deren direkte Wiederverwendung in der Glanzstoffindustrie unmöglich macht.Process for the regeneration of the precipitating alkali solutions in the viscose luster industry When cellulose is treated with more than 17% sodium hydroxide solution, it forms a made from the soda compound of alfacellulose, as a starting material for the viscose industry directly usable residue, while the rest are not spinnable Components of the pulp together with the dyes, tanning agents and resins go into solution. The hexosanes contained in the waste eyes stand next to one a small amount of pentosan an annoying contamination of the alkalis, which their makes direct reuse in the luster industry impossible.
Die bisher in der Viskoseglanzstoffindustrie vorgenommene Regenerierung der abfallenden Alkalilaugen durch Eindampfen, Nachkaustisieren, Schmelzen und Glühen ist infolge des notwendigen großen Aufwandes an Wärme, Arbeit und Zeit äußerst kostspielig.The regeneration previously carried out in the viscose luster industry of the falling alkali lye by evaporation, re-causticizing, melting and glowing is extremely costly due to the large amount of heat, labor and time required.
Erfindungsgemäß wurde nun festgestellt, daß diese verunreinigten Alkalilaugen in einfacher Weise dadurch regeneriert werden können, daß man ihnen Alkohole zusetzt, wodurch die Hexosane neben einer geringen Menge von Pentosan ausfallen.According to the invention it has now been found that these contaminated alkaline solutions can be regenerated in a simple manner by adding alcohols to them, whereby the hexosanes precipitate in addition to a small amount of pentosan.
Der als Fällungsmittel zugesetzte Alkohol kann in einfacher Weise durch Destillation zurückgewonnen werden, so daß das Verfahren unter besonders günstigen wirtschaftlichen Verhältnissen arbeitet. Als zuzusetzender Alkohol kommt in erster Linie Äthylalkohol und Methylalkohol in Frage.The alcohol added as a precipitating agent can be used in a simple manner be recovered by distillation, so that the process under particularly favorable economic conditions works. As alcohol to be added comes first Line ethyl alcohol and methyl alcohol in question.
Aus der Analytik ist wohl bereits bekannt, daß in Natronlauge enthaltenes Holzgummi (Pentosan) durch Alkohol quantitativ gefällt werden kann. Das Holzgummi bildet jedoch bloß einen geringen Bruchteil der Menge der die abfallenden Natronlaugen verunreinigenden Substanzen, und die Erfindung offenbart die nicht vorauszusehende Erkenntnis, daß durch den Zusatz von Alkohol auch noch die anderen die Abfallaugen verunreinigenden, nicht spinnbaren Stoffe, die Hexosane (Hemicellulosen und Lignine), niedergeschlagen werden können. Ausführungsbeispiel In einem Gefäß läßt man zu loo kg Abfalllauge der Viskoseglanzstoffindustrie einem Gehalte von 17,85°/o NaOH unter kräftigem Umrühren 68 kg g4volumprozentigen Äthylalkohols einfließen. Die Temperatur wird hierbei zwischen xo bis 30' C gehalten. Gegebenenfalls wird zur Entfärbung noch etwa 0,03 kg Bleiacetat zugesetzt. Die ausgeschiedenen Stoffe werden durch einfaches Absitzenlassen und Filtrieren von der alkoholischen Natronlauge getrennt. Diese wird mit der zur Nachkaustisierung entsprechenden Menge Ätzkalk versetzt und der Äthylalkohol in einer Menge von 67,5 kg (94volumprozentig) durch Destillation in entsprechenden Apparaten zurückgewonnen, Die erhaltene, etwa 2o°/oige Natronlauge wird entweder direkt weiterverwendet oder nach bekannten Verfahren zu höher konzentrierter Lauge oder zu festem, geschmolzenem Natriumhydroxyd aufgearbeitet.It is already known from analytics that wood gum (pentosan) contained in sodium hydroxide can be quantitatively precipitated by alcohol. However, the wooden rubber forms only a small fraction of the amount of the substances contaminating the falling caustic soda, and the invention reveals the unforeseeable finding that the addition of alcohol also causes the other non-spinnable substances that contaminate the waste eyes, the hexosans (hemicelluloses and lignins ), can be knocked down. EXEMPLARY EMBODIMENT In a vessel, 68 kg volume percent ethyl alcohol are added to 100 kg of waste liquor from the viscose luster industry with a content of 17.85% NaOH with vigorous stirring. The temperature is kept between xo to 30 ° C. If necessary, about 0.03 kg of lead acetate is added to decolorize. The excreted substances are separated from the alcoholic caustic soda by simply allowing them to settle and filtering. This is mixed with the amount of quick lime appropriate for post caustic and the ethyl alcohol in an amount of 67.5 kg (94 percent by volume) is recovered by distillation in appropriate apparatus concentrated lye or worked up to solid, molten sodium hydroxide.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEW78123D DE536914C (en) | 1928-01-04 | 1928-01-05 | Process for the regeneration of the precipitating alkali solutions in the viscose luster industry |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE303482X | 1928-01-04 | ||
| DEW78123D DE536914C (en) | 1928-01-04 | 1928-01-05 | Process for the regeneration of the precipitating alkali solutions in the viscose luster industry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE536914C true DE536914C (en) | 1931-10-28 |
Family
ID=25787874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEW78123D Expired DE536914C (en) | 1928-01-04 | 1928-01-05 | Process for the regeneration of the precipitating alkali solutions in the viscose luster industry |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE536914C (en) |
-
1928
- 1928-01-05 DE DEW78123D patent/DE536914C/en not_active Expired
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