CH404628A - Device for the catalytic hydrogenation of sugars - Google Patents
Device for the catalytic hydrogenation of sugarsInfo
- Publication number
- CH404628A CH404628A CH5124857A CH5124857A CH404628A CH 404628 A CH404628 A CH 404628A CH 5124857 A CH5124857 A CH 5124857A CH 5124857 A CH5124857 A CH 5124857A CH 404628 A CH404628 A CH 404628A
- Authority
- CH
- Switzerland
- Prior art keywords
- stirrer
- sugars
- catalytic hydrogenation
- solution
- hydrogenation
- Prior art date
Links
- 235000000346 sugar Nutrition 0.000 title claims description 12
- 150000008163 sugars Chemical class 0.000 title claims description 6
- 238000009903 catalytic hydrogenation reaction Methods 0.000 title claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 10
- 239000008103 glucose Substances 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 238000005984 hydrogenation reaction Methods 0.000 description 5
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 4
- 239000000600 sorbitol Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 1
- WQZGKKKJIJFFOK-QTVWNMPRSA-N D-mannopyranose Chemical compound OC[C@H]1OC(O)[C@@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-QTVWNMPRSA-N 0.000 description 1
- 229930195725 Mannitol Natural products 0.000 description 1
- 229910000564 Raney nickel Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 1
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 1
- 239000012928 buffer substance Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000000468 ketone group Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000594 mannitol Substances 0.000 description 1
- 235000010355 mannitol Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- 125000000075 primary alcohol group Chemical group 0.000 description 1
- 125000003198 secondary alcohol group Chemical group 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
- C07C31/18—Polyhydroxylic acyclic alcohols
- C07C31/26—Hexahydroxylic alcohols
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Saccharide Compounds (AREA)
Description
Vorrichtung zur katalytischen Hydrierung von Zuckern
Es ist bekannt, die Aldehyd- oder Ketongruppen reduzierbarer Zucker durch katalytische Redukfion bzw. Hydrierung unter bestimmten Temperatur- und Druckbedingungen in primäre oder sekundäre Alkoholgruppen umzuwandeln, wobei z. B. aus Monosacchariden, z. B. aus Glukose Sorbit, aus Xylose Sylit, aus Mannose Mannit usw. erhalten werden, was natürlich auch für Gemische solcher Zucker gilt. Insbesondere lässt sich Glukose unter bestimmten Temperatur- und Druckbedingungen zu sehr reinem Sorbit katalytisch hydrieren.
Gegenstand der Erfindung ist eine Vorrichtung zur katalytischen Hydrierung von Zuckern, bestehend aus einem liegenden zylindrischen Reaktionsgefäss mit Rührer und senkrecht zur Achse des Rührers stehenden Rührblättern, die dadurch gekennzeichnet ist, dass die Rührblätter als Kehrschaufeln ausgebildet sind, die mit ihrer abgeflachten Seite an der Achse des Rührers befestigt sind.
In der Zeichnung ist eine Ausführungsform der Erfindung beschrieben:
Fig. 1 zeigt die Draufsicht und
Fig. 1 a einen Querschnitt durch eine Rührschaufel gemäss der Erfindung,
Fig. 2 zeigt die Draufsicht auf und
Fig. 3 einen Querschnitt durch die Rührachse mit den darauf angeordneten Schaufeln
Fig. 4 zeigt den Teil eines Längsschnittes durch den Zylinder.
Die besondere Wirkung der Schaufeln kommt dadurch zustande, dass auf den Schaufeln durch die rotierende Bewegung die zu hydrierende Zuckerlösung nebst Kontaktschlamm in die Wasserstoffphase gelangt, wobei bis zur Erreichung des Scheitelpunktes mehr Lösung als schwererer Kontakt abfliesst, so dass nach Überschreitung des Scheitelpunktes die Schdpf- flächen der Schaufeln nur von sedimentiertem Kontakt nebst einem dünnen Lösungsfilm bedeckt sind.
Hierdurch wird eine vollkommene Hydrierung der Zuckerlösung in kurzer Zeit, beispielsweise in zwei und einer halben Stunde, erreicht, während z. B. bei Verwendung eines intensiv wirkenden Plattenrührwerks üblicher Bauart, das nur in die Flüssigkeit eintaucht, fünf weitere Stunden zur Erzielung der gleichen Hydrierung erforderlich sind.
Die Vorteile der Vorrichtung werden anhand der folgenden Vergleichsbeispiele dargetan.
Beispiele
1. In eine SO%ige wässrige Glukoselösung, die mit Natronlauge auf pH-Wert von 7,8 eingestellt war, wurde 7% feinst verteilter Raney-Nickel-Katalysator, bezogen auf die Zuckermenge, iin einem liegenden zylindrischen Autoklaven suspendiert, 2/3des freien Raumes im Autoklaven waren mit Glukoselösung und 1/3 mit Wasserstoff genutzt worden.
Der Autoklav war mit einem gewöhnlichen Schaufeln-Rührer, Manometer und Wärmemesser ausgerüstet und stand mit einem pH-Messgerät in Verbindung. Der zu Beginn der Hydrierung eingestellte pH-Wert der Glukoselösung wurde durch Zugabe von einer Puf fersubstanz - MgC03 - praktisch auf dieser Höhe während der Hydrierung die ganze Zeit gehalten.
Zu Beginn der Hydrierung wurde ein Wasserstoffdruck von 30 Atmosphären auf die Zuckerlösung aufgedrückt, die Rührvorrichtung mit einer Umdrehungszahl von 72 U/min. in Gang gebracht und mit der Aufwärmung der Glukoselösung begonnen. In ca. 25 Min. wurde die Reaktionstemperatur von 110je in der Glukoselösung erreicht. Nach weiteren 300 Min.
Behandlung des Reaktionsgutes bei 1 100C und 30 Atmosphären Wasserstoffdruck war die Wasserstoffaufnahme in der Zuckerlösung beendet.
99,7% der Glukose wurden in Sorbit umgewandelt.
2. Dieselben Bedingungen wie in Beispiel 1, nur die Rührvorrichtung bestand aus dem intensiv wirkenden Schöpfschaufeln-Rührer gemäss der vorliegenden Erfindung.
In 28 Minuten wurde die Reaktionstemperatur von 1800C in der Glukoselösung erreicht. Nach weiteren 160 Min. Behandlung des Reaktionsgutes, bei 108 1 100C und 30 Atmosphären Wasserstoffdruck, war die Wasserstoffaufnahme in der Zuckerlösung praktisch beendet.
99,66% der Glukose wurde in Sorbit umgewandelt.
Device for the catalytic hydrogenation of sugars
It is known that the aldehyde or ketone groups of reducible sugars can be converted into primary or secondary alcohol groups by catalytic reduction or hydrogenation under certain temperature and pressure conditions. B. from monosaccharides, e.g. B. from glucose sorbitol, from xylose sylitol, from mannose mannitol, etc. can be obtained, which of course also applies to mixtures of such sugars. In particular, under certain temperature and pressure conditions, glucose can be catalytically hydrogenated to very pure sorbitol.
The invention relates to a device for the catalytic hydrogenation of sugars, consisting of a horizontal cylindrical reaction vessel with a stirrer and stirrer blades perpendicular to the axis of the stirrer, which is characterized in that the stirrer blades are designed as dustpans with their flattened side on the axis of the stirrer are attached.
An embodiment of the invention is described in the drawing:
Fig. 1 shows the plan view and
1 a shows a cross section through a stirring blade according to the invention,
Fig. 2 shows the plan view of and
3 shows a cross section through the agitation axis with the blades arranged on it
Fig. 4 shows part of a longitudinal section through the cylinder.
The special effect of the blades is due to the fact that the rotating movement of the sugar solution to be hydrogenated and the contact sludge on the blades gets into the hydrogen phase, with more solution flowing off as a heavier contact until the apex is reached, so that after the apex is exceeded, the steam surfaces of the blades are only covered by sedimented contact and a thin film of solution.
As a result, a complete hydrogenation of the sugar solution is achieved in a short time, for example in two and a half hours, while z. B. when using an intensely acting plate agitator of the usual design, which is only immersed in the liquid, five more hours are required to achieve the same hydrogenation.
The advantages of the device are demonstrated by the following comparative examples.
Examples
1. In a 50% aqueous glucose solution which had been adjusted to pH 7.8 with sodium hydroxide solution, 7% finely divided Raney nickel catalyst, based on the amount of sugar, was suspended in a horizontal cylindrical autoclave, 2/3 des Free space in the autoclave had been used with glucose solution and 1/3 with hydrogen.
The autoclave was equipped with a common paddle stirrer, manometer and thermometer and was connected to a pH meter. The pH of the glucose solution set at the beginning of the hydrogenation was kept practically at this level throughout the hydrogenation by adding a buffer substance - MgCO 3.
At the beginning of the hydrogenation, a hydrogen pressure of 30 atmospheres was applied to the sugar solution and the stirrer was rotated at 72 rpm. started and started to warm up the glucose solution. The reaction temperature of 110 each in the glucose solution was reached in about 25 minutes. After another 300 min.
Treatment of the reaction mixture at 110 ° C. and 30 atmospheric hydrogen pressure ended the uptake of hydrogen in the sugar solution.
99.7% of the glucose was converted to sorbitol.
2. The same conditions as in Example 1, only the stirring device consisted of the intensely acting scoop stirrer according to the present invention.
The reaction temperature of 1800C in the glucose solution was reached in 28 minutes. After a further 160 minutes of treatment of the reaction mixture at 108,100 ° C. and 30 atmospheric hydrogen pressure, the hydrogen uptake in the sugar solution was practically complete.
99.66% of the glucose was converted to sorbitol.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH5124857A CH404628A (en) | 1957-10-01 | 1957-10-01 | Device for the catalytic hydrogenation of sugars |
| SE810458A SE303485B (en) | 1957-10-01 | 1958-08-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH5124857A CH404628A (en) | 1957-10-01 | 1957-10-01 | Device for the catalytic hydrogenation of sugars |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH404628A true CH404628A (en) | 1965-12-31 |
Family
ID=4517518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH5124857A CH404628A (en) | 1957-10-01 | 1957-10-01 | Device for the catalytic hydrogenation of sugars |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH404628A (en) |
| SE (1) | SE303485B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004721A1 (en) * | 1978-03-30 | 1979-10-17 | Ici Americas Inc. | Process for hydrogenation of sugar solutions to a high-mannitol product |
| US4292451A (en) | 1978-03-30 | 1981-09-29 | Ici Americas Inc. | High mannitol process (alkaline hydrogenation in presence of alkali metal carbonate) |
-
1957
- 1957-10-01 CH CH5124857A patent/CH404628A/en unknown
-
1958
- 1958-08-29 SE SE810458A patent/SE303485B/xx unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004721A1 (en) * | 1978-03-30 | 1979-10-17 | Ici Americas Inc. | Process for hydrogenation of sugar solutions to a high-mannitol product |
| US4292451A (en) | 1978-03-30 | 1981-09-29 | Ici Americas Inc. | High mannitol process (alkaline hydrogenation in presence of alkali metal carbonate) |
Also Published As
| Publication number | Publication date |
|---|---|
| SE303485B (en) | 1968-09-02 |
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