EP0000119A1 - Process for preparing anhydrous caustic alkali melts - Google Patents
Process for preparing anhydrous caustic alkali melts Download PDFInfo
- Publication number
- EP0000119A1 EP0000119A1 EP78100077A EP78100077A EP0000119A1 EP 0000119 A1 EP0000119 A1 EP 0000119A1 EP 78100077 A EP78100077 A EP 78100077A EP 78100077 A EP78100077 A EP 78100077A EP 0000119 A1 EP0000119 A1 EP 0000119A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- caustic
- melts
- water content
- monoxide
- alkali
- 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.)
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- 239000003518 caustics Substances 0.000 title claims abstract description 19
- 239000003513 alkali Substances 0.000 title claims abstract description 17
- 239000000155 melt Substances 0.000 title claims description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- NTGONJLAOZZDJO-UHFFFAOYSA-M disodium;hydroxide Chemical compound [OH-].[Na+].[Na+] NTGONJLAOZZDJO-UHFFFAOYSA-M 0.000 claims abstract description 7
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 4
- FZFYOUJTOSBFPQ-UHFFFAOYSA-M dipotassium;hydroxide Chemical compound [OH-].[K+].[K+] FZFYOUJTOSBFPQ-UHFFFAOYSA-M 0.000 claims abstract description 4
- NOTVAPJNGZMVSD-UHFFFAOYSA-N potassium monoxide Inorganic materials [K]O[K] NOTVAPJNGZMVSD-UHFFFAOYSA-N 0.000 claims abstract description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 64
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 21
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 230000007717 exclusion Effects 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229910001854 alkali hydroxide Inorganic materials 0.000 claims description 2
- 230000005496 eutectics Effects 0.000 claims description 2
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000012299 nitrogen atmosphere Substances 0.000 abstract description 3
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 5
- 239000008247 solid mixture Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- ODZPKZBBUMBTMG-UHFFFAOYSA-N sodium amide Chemical compound [NH2-].[Na+] ODZPKZBBUMBTMG-UHFFFAOYSA-N 0.000 description 2
- 239000012312 sodium hydride Substances 0.000 description 2
- 229910000104 sodium hydride Inorganic materials 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000000374 eutectic mixture Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229940097275 indigo Drugs 0.000 description 1
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
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
Definitions
- the present invention relates to a method for producing anhydrous etching potash and / or caustic soda melts.
- the method is preferably suitable for the production of anhydrous caustic potash / caustic mixed melts.
- caustic potash and caustic soda form strongly hygroscopic hydrates in the solid state, which crystallize out of the corresponding caustic potash lyes depending on the concentration and temperature of the lye with different crystal water content.
- solid caustic potash has about 90 to 92%, sometimes up to 96%, of solid KOH.
- water content of the commercially available caustic soda is 1 to 2%.
- the melts or mixed melts of such commercially available caustic alkalis with a water content of 1 to 10% are for reactions that occur in the melt in the presence reactive components, such as sodium hydride or sodium amide, are unsuitable. Before such reactions, they therefore have to be subjected to special dewatering, which has hitherto been carried out using various processes:
- the production of anhydrous caustic alkali has hitherto been carried out by evaporating water-containing alkali hydroxide under normal pressure or reduced pressure in various types of evaporator systems. Evaporation in the presence of a protective gas atmosphere is also known.
- the disadvantages of these dewatering processes are that temperatures above 450 ° C. or 500 ° C.
- the object was therefore to find a process for the production of anhydrous caustic alkali melts which can be carried out in the customary, alkali-resistant apparatus and containers and in which there is no additional heating to temperatures above 450.degree. Furthermore, the method should preferably be able to be carried out at normal pressure.
- equimolar amounts of the alkali oxides are to be understood as the amounts which correspond to the reaction equation react with water. An excess corresponding to this amount can be used and does not interfere with the process according to the invention.
- the Wawser content of the caustic alkali to be used is expediently determined by titration with 0.5 N sulfuric acid. The amount of alkali oxide to be added is determined in accordance with this water content.
- the etching alkali-alkali monoxide solid mixtures on which the process is based are inert, can be poured and stored with the exclusion of moisture, so that the mixtures can be easily lifted. These properties are retained even when an excess of alkali oxide is used.
- the melting and dewatering of the caustic alkali / alkali oxide mixtures or the direct addition of the alkali oxides to the melts to be dewatered takes place at a relatively low temperature, i.e. temperatures that are only slightly above the melting point of caustic potash or caustic soda or their mixtures are sufficient. These melting temperatures depend on the water content of the caustic alkali melts used and the mixing ratio KOH / NaOH. In general, temperatures between 200 ° C and 420 ° C.
- the process according to the invention is generally carried out in such a way that technical or caustic soda or caustic potash / caustic soda mixtures in flake, powder or lumpy form with at least that Water content of this caustic alkali or the caustic alkali mixture equimolar amount of potassium or sodium monoxide is mixed as homogeneously as possible and then melted. If one or more of the components are in lumpy form, the mixing is expediently carried out with comminution. All work should be carried out with the exclusion of moisture if possible, for example by working in a nitrogen atmosphere - or another inert gas atmosphere. Covering with dry air is also possible.
- Caustic potash / caustic soda mixtures can be melted in any mixing ratio with the amount of sodium monoxide required depending on their water content; however, the caustic alkali / sodium monoxide solid mixtures are preferably prepared in such a way that the proportion of caustic potash in the melted mixture is 60% by weight, so that a eutectic mixture is present, the melting temperatures being between 180 and 250 ° C.
- melts can then be used, for example, as conditioning and dehydrating agents in dye syntheses, for example in indigo synthesis.
- the specified mixing ratio corresponds to an anhydrous eutectic melt of 60% by weight KOH and 40% by weight NaOH.
- the water content of the melt obtained was 0% by weight; it was determined by repeated careful heating (approx. 5 minutes) of a weighed sample of the solid mixture to about 600 to 700 ° C. until the weight was constant. The heated samples were cooled to room temperature in the desiccator.
- Example 2 72 parts by weight of KOH with a water content of 9.7%, 2 parts by weight of NaOH with a water content of 1.8% and 26 parts by weight of Na 2 0 were mixed analogously to Example 1.
- the mixing ratio corresponds to an anhydrous caustic alkali melt with 65% by weight KOH, 33.3% by weight NaOH and 1.7% by weight Na 2 O.
- the temperature required to completely melt the solid mixture was 220 ° C., the water content the melt was on the im; Example 1 described type determined; it was 0% by weight.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung wasserfrezer Ätzkali- und/oder Ätznatron- schmelzen. Das Verfahren eignet sich bevorzugt zur Her- stellung wasserfreier Ätzkali/Ätznatron-Mischschmelzen.The present invention relates to a method for producing anhydrous etching potash and / or caustic soda melts. The method is preferably suitable for the production of anhydrous caustic potash / caustic mixed melts.
Es ist bekannt, daß Ätzkali und Ätznatron in festem Zustand stark hygroskopische Hydrate bilden, die aus den entsprechenden Ätzalkalilaugen je nach Konzentration und Temperatur der Lauge mit unterschiedlichem Kristallwassergehalt auskristallisieren.It is known that caustic potash and caustic soda form strongly hygroscopic hydrates in the solid state, which crystallize out of the corresponding caustic potash lyes depending on the concentration and temperature of the lye with different crystal water content.
Während festes Ätzkali etwa 90 bis 92 %, teilweise bis zu 96 % Feststoffanteil KOH besitzt,. liegt der Wassergehalt des handelsüblichen Ätznatrons bei 1 bis 2 %.While solid caustic potash has about 90 to 92%, sometimes up to 96%, of solid KOH. the water content of the commercially available caustic soda is 1 to 2%.
Die Schmelzen bzw.. Mischschmelzen von solchen handelsüblichen Ätzalkalien mit einem Wassergehalt von 1 bis 10 % sind für Reaktionen, die in der Schmelze bei Anwesenheit reaktiver Komponenten, wie z.B. Natriumhydrid oder Natriumamid, durchgeführt werden, ungeeignet. Sie müssen deshalb vor solcher Reaktionen einer speziellen Entwässerung unterzogen werden, die bisher nach verschiedenen Verfahren durchgeführt wurde: Die Herstellung von wasserfreiem Ätzalkali erfolgte bisher durch Eindampfen von wasserhaltigem Alkalihydroxid unter Normaldruck oder reduziertem Druck in Verdampferanlagen verschiedener Bauart. Auch das Eindampfen in Anwesenheit einer Schutzgasatmosphäre ist bekannt. Die Nachteile dieser.Ent- wässerungsverfahren liegen darin, daß für die quantitative Entfernung des Kristallwassers aus Ätznatron oder Ätzkali Temperaturen oberhalb 450 °C bzw. 500 °C erforderlich sind und aufgrund der bei diesen Temperaturen sehr starken Aggressivität der Schmelzen hohe Anforderungen an das Gefäßmaterial gestellt werden. Zur Behebung dieser Nachteile wurde bereits vorgeschlagen, das Abdampfen des Restwassers in silberplattierten Apparaturen durchzuführen. Diese Arbeitsweise bedingt jedoch eine zusätzliche aufwendige Herstellung dieser speziellem Apparaturen.The melts or mixed melts of such commercially available caustic alkalis with a water content of 1 to 10% are for reactions that occur in the melt in the presence reactive components, such as sodium hydride or sodium amide, are unsuitable. Before such reactions, they therefore have to be subjected to special dewatering, which has hitherto been carried out using various processes: The production of anhydrous caustic alkali has hitherto been carried out by evaporating water-containing alkali hydroxide under normal pressure or reduced pressure in various types of evaporator systems. Evaporation in the presence of a protective gas atmosphere is also known. The disadvantages of these dewatering processes are that temperatures above 450 ° C. or 500 ° C. are required for the quantitative removal of the water of crystallization from caustic soda or caustic potash, and high demands are placed on the vessel material due to the very aggressive aggressiveness of the melts at these temperatures become. To overcome these disadvantages, it has already been proposed to evaporate the residual water in silver-plated apparatus. However, this procedure requires an additional complex manufacture of these special devices.
Es bestand deshalb die Aufgabe, ein Verfahren zur Herstellung wasserfreier Ätzalkalischmelzen zu finden, das in den üblichen, alkalibeständigen Apparaturen und Behältern durchgeführt werden kann und bei dem ein zusätzliches Erhitzen auf Temperaturen oberhalb 450 °C entfällt. Weiterhin soll das Verfahren bevorzugt bei Normaldruck durchführbar sein.The object was therefore to find a process for the production of anhydrous caustic alkali melts which can be carried out in the customary, alkali-resistant apparatus and containers and in which there is no additional heating to temperatures above 450.degree. Furthermore, the method should preferably be able to be carried out at normal pressure.
In Erfüllung dieser Aufgabe wurde nun ein Verfahren zur Herstellung wasserfreier Ätzalkalischmelzen gefunden, das dadurch gekennzeichnet ist, daß man wasserhaltiges, festes Alkalihydroxid mit Einer seinem Wassergehalt mindestens äquimolaren Menge an Natrium- und/oder Kaliummonoxid aufschmilzt.In fulfilling this object, a process for the production of anhydrous caustic alkali melts has now been found, which is characterized in that water-containing, solid alkali metal hydroxide is melted with an amount of sodium and / or potassium monoxide which is at least equimolar to its water content.
Unter äquimolaren Mengen der Alkalioxide sollen erfin- dungsgemäß die Mengen verstanden werden, die sich gemäß der Reaktionsgleichung
Die dem Verfahren zugrundeliegenden Ätzalkali-Alkalimonoxid-Feststoffgemische sind unter Feuchtigkeitsausschluß inert, schütt- und lagerfähig, so daß eine gute Handhobbarkeit der Gemische gegeben ist. Diese Eibenschaften bleiben auch bei Einsatz eines Überschusses an Alkalioxid erhalten.The etching alkali-alkali monoxide solid mixtures on which the process is based are inert, can be poured and stored with the exclusion of moisture, so that the mixtures can be easily lifted. These properties are retained even when an excess of alkali oxide is used.
Der Einsatz eines solchen Überschusses ist auch dann von Vorteil, wenn man die Ätzalkali-Alkalimonoxid-Feststoffgemische bzw. die entwässerten Ätzalkalischmelzen an der Luft handhaben will oder wenn man der Schmelze noch wei- tere Komponenten hinzugeben will, die ggf. ebenfalls entwässert werden sollen.The use of such an excess is also advantageous if you want to handle the caustic alkali-alkali monoxide solid mixtures or the dewatered caustic alkali melts in the air or if you want to add further components to the melt that may also need to be dewatered.
Das Aufschmelzen und Entwässern der Ätzalkali-alkalioxid- Gemische bzw. der direkte Zusatz der Alkalioxide zu den zu entwässernden Schmelzen erfolgt bei relativ niedriger Temperatur, d.h. es genügen Temperaturen, die nur geringfügig über dem Schmelzpunkt von Ätzkali oder Ätznatron oder deren Gemische liegen. Diese Schmelztemperaturen hängen von dem Wassergehalt der eingesetzten Ätzalkalischmelzen und dem Mischungsverhältnis KOH/NaOH ab. Im allgemeinen arbeitet man bei Temperaturen zwischen 200 °C und 420 °C.The melting and dewatering of the caustic alkali / alkali oxide mixtures or the direct addition of the alkali oxides to the melts to be dewatered takes place at a relatively low temperature, i.e. temperatures that are only slightly above the melting point of caustic potash or caustic soda or their mixtures are sufficient. These melting temperatures depend on the water content of the caustic alkali melts used and the mixing ratio KOH / NaOH. In general, temperatures between 200 ° C and 420 ° C.
Die Durchführung des erfindungsgemäßen Verfahrens erfolgt im allgemeinen in der Weise, daß technisches oder Ätznatron bzw. Ätzkali/Ätznatron-Mischungen in Schuppen-, Pulver oder stückiger Form mit einer mindestens dem Wassergehalt dieser Ätzalkali bzw. der Ätzalkalimischung äquimolaren Menge Kalium- oder Natriummonoxid möglichst homogen gemischt und anschließend aufgeschmolzen wird. Wenn einer oder mehrere der Komponenten in stückiger Form vorliegen, erfolgt das Mischen zweckmäßigerweise unter Zerkleinerung. Alle Arbeiten sollen möglichst unter Feuchtigkeitsausschluß durchgeführt werden, indem z.B. in einer Stickstoffatmosphäre - oder einer anderen Inertgasatmosphäre - gearbeitet wird. Auch eine Beschleierung mit trockener Luft ist möglich.The process according to the invention is generally carried out in such a way that technical or caustic soda or caustic potash / caustic soda mixtures in flake, powder or lumpy form with at least that Water content of this caustic alkali or the caustic alkali mixture equimolar amount of potassium or sodium monoxide is mixed as homogeneously as possible and then melted. If one or more of the components are in lumpy form, the mixing is expediently carried out with comminution. All work should be carried out with the exclusion of moisture if possible, for example by working in a nitrogen atmosphere - or another inert gas atmosphere. Covering with dry air is also possible.
Ätzkali/Ätznatron-Mischungen können im beliebigen Mischungsverhältnis mit der je nach ihrem Wassergehalt erforderlichen Menge Natriummonoxid aufgeschmolzen werden; vorzugsweise erfolgt der Ansatz der Ätzalkali/Natriummonoxid-Feststoffmischungen dabei jedoch so, daß der Anteil an Ätzkali in der aufgeschmolzenen Mischung 60 Gew.-% beträgt, so daß eine eutektische Mischung vorliegt, wobei die Aufschmelztemperaturen zwischen 180 und 250 °C liegen.Caustic potash / caustic soda mixtures can be melted in any mixing ratio with the amount of sodium monoxide required depending on their water content; however, the caustic alkali / sodium monoxide solid mixtures are preferably prepared in such a way that the proportion of caustic potash in the melted mixture is 60% by weight, so that a eutectic mixture is present, the melting temperatures being between 180 and 250 ° C.
Nach dem erfinndungsgemäßen Entwässern des Ätzalkalis kann man diesem reaktive-Komponenten wie Natriumhydrid oder Natriumamid zumischen bzw. zuschmelzen, ohne daß dabei eine störende Bildung von Wasserstoff oder Ammoniak eintritt. Derartige Schmelzen können dann z.B. als Köndensations- und Dehydratisationsmittel bei Farbstoffsynthesen wie z.B. bei der Indigo-Synthese, eingesetzt werden.After draining the caustic erfinndungsgemäßen this can be reactive - blending components such as sodium hydride or sodium amide or Heat seal, without causing an annoying formation of hydrogen or ammonia occurs. Such melts can then be used, for example, as conditioning and dehydrating agents in dye syntheses, for example in indigo synthesis.
65,9 Gew,-Teile KOH mit einem Wassergehalt von 9 %, 13,2 Gew.-Teile NaOH mit einem Wassergehalt von' 1 % und 20,9 Gew.-Teile Na20 werden unter Stickstoffatmosphäre gemischt und bei einer Temperatur von 210 bis 220 °C vollständig aufgeschmolzen.65.9 parts by weight of KOH with a water content of 9%, 13.2 parts by weight of NaOH with a water content of '1% and 20.9 parts by weight of Na 2 0 are mixed under a nitrogen atmosphere and at a temperature of 210 to 220 ° C completely melted.
Das angegebene Mischungsverhältnis entspricht einer wasserfreien eutektischen Schmelze von 60 Gew.-% KOH und 40 Gew.-% NaOH.The specified mixing ratio corresponds to an anhydrous eutectic melt of 60% by weight KOH and 40% by weight NaOH.
Der Wassergehalt der erhaltenen Schmelze lag bei 0 Gew.-%; er wurde durch mehrmaliges vorsichtiges-Erhitzen (ca. 5 Minuten) einer eingewogenen Probe der Feststoffmischung auf etwa 600 bis 700 °C bis zur Gewichtskonstanz bestimmt. Das Abkühlen der erhitzten Proben auf Raumtemperatur erfolgte im Exsiccator.The water content of the melt obtained was 0% by weight; it was determined by repeated careful heating (approx. 5 minutes) of a weighed sample of the solid mixture to about 600 to 700 ° C. until the weight was constant. The heated samples were cooled to room temperature in the desiccator.
72 Gew.-Teile KOH mit einem Wassergehalt von 9,7 %, 2 Gew.-Teile NaOH mit einem Wassergehalt von 1,8 % und 26 Gew.-Teile Na20 wurden analog Beispiel 1 gemischt. Das Mischungsverhältnis entspricht einer wasserfreien Ätzalkalischmelze mit 65 Gew.-% KOH, 33,3 Gew.-% NaOH und 1,7 Gew.-% Na2O. Die zum vollständigen Aufschmelzen der Feststoffmischung erforderliche Temperatur lag bei 220 °C, der Wassergehalt der Schmelze wurde auf die im ; Beispiel 1 beschriebene Art bestimmt; er lag bei 0 Gew.-%.72 parts by weight of KOH with a water content of 9.7%, 2 parts by weight of NaOH with a water content of 1.8% and 26 parts by weight of Na 2 0 were mixed analogously to Example 1. The mixing ratio corresponds to an anhydrous caustic alkali melt with 65% by weight KOH, 33.3% by weight NaOH and 1.7% by weight Na 2 O. The temperature required to completely melt the solid mixture was 220 ° C., the water content the melt was on the im; Example 1 described type determined; it was 0% by weight.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2729715 | 1977-07-01 | ||
| DE19772729715 DE2729715A1 (en) | 1977-07-01 | 1977-07-01 | Process for the production of anhydrous caustic alkaline melts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0000119A1 true EP0000119A1 (en) | 1979-01-10 |
Family
ID=6012880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP78100077A Withdrawn EP0000119A1 (en) | 1977-07-01 | 1978-06-02 | Process for preparing anhydrous caustic alkali melts |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0000119A1 (en) |
| DE (1) | DE2729715A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR723031A (en) * | 1931-09-19 | 1932-04-01 | Degussa | Process for the dehydration of alkali hydroxides containing water |
-
1977
- 1977-07-01 DE DE19772729715 patent/DE2729715A1/en active Pending
-
1978
- 1978-06-02 EP EP78100077A patent/EP0000119A1/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR723031A (en) * | 1931-09-19 | 1932-04-01 | Degussa | Process for the dehydration of alkali hydroxides containing water |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2729715A1 (en) | 1979-01-04 |
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