DE453409C - Increasing the shelf life of alkali hydrosulfite - Google Patents

Increasing the shelf life of alkali hydrosulfite

Info

Publication number
DE453409C
DE453409C DEV19651D DEV0019651D DE453409C DE 453409 C DE453409 C DE 453409C DE V19651 D DEV19651 D DE V19651D DE V0019651 D DEV0019651 D DE V0019651D DE 453409 C DE453409 C DE 453409C
Authority
DE
Germany
Prior art keywords
alkali
hydrosulfite
shelf life
increasing
solution
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
Application number
DEV19651D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ver Chemische & Metallurgische
Original Assignee
Ver Chemische & Metallurgische
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ver Chemische & Metallurgische filed Critical Ver Chemische & Metallurgische
Priority to DEV19651D priority Critical patent/DE453409C/en
Application granted granted Critical
Publication of DE453409C publication Critical patent/DE453409C/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/64—Thiosulfates; Dithionites; Polythionates
    • C01B17/66—Dithionites or hydrosulfites (S2O42-)
    • C01B17/665—Stabilisation by additives subsequent to preparation; Dust prevention by additives

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Erhöhung der Haltbarkeit von Alkalihydrosulfit. Bei der Verwendung von Alkalihydrosulfit als Reduktionsmittel in schwach alkalischer oder neutraler Lösung zeigt sich der übelstand, daß in kurzer Zeit Zersetzung erfolgt und dadurch die Wirksamkeit der Lösung rasch erheblich vermindert wird. Demgemäß verlangt die Erreichung eines bestimmten Reduktionseffektes die Anwendung eines je nach der Zeitdauer der Einwirkung mehr oder minder großen Überschusses an Hydrosulfit. Es ist bisher nur in stark alkalischen Lösungen gelungen, diese Zersetzung des Alkalihydrosulfits auf ein Mindestmaß herabzusetzen. Indessen können solche stark alkalischen Lösungen nur für bestimmte Verwendungszwecke des Alkalihydrosulfits herangezogen werden, während andere wichtige Anwendungsgebiete die Verwendung des Alkalihydrosulfits in neutraler oder höchstens schwach alkalischer Lösung erfordern.Increase the shelf life of alkali hydrosulfite. When using of alkali hydrosulfite as a reducing agent in weakly alkaline or neutral Solution shows the evil that decomposition takes place in a short time and thereby the effectiveness of the solution is rapidly reduced considerably. Accordingly, the Achieving a certain reduction effect the application of one depending on the length of time the action of a more or less large excess of hydrosulphite. It is so far This decomposition of the alkali hydrosulfite succeeded only in strongly alkaline solutions reduce to a minimum. However, such strongly alkaline solutions can are only used for certain purposes of the alkali hydrosulfite, while other important areas of application are the use of alkali hydrosulfite in neutral or at most weakly alkaline solution.

überraschenderweise wurde gefunden, daß man diese Zersetzung des Alkalihydrosulfits und die damit verbundenen übelstände auf einfache Weise vermeiden kann, wenn man das Alkalihydrosulfit bei Gegenwart von Sulfiten, vorzugsweise Alkalisulfiten, wie beispielsweise Natriumsulfit, in Lösung bringt. Zweckmäßig bringt man trockene Gemische zur Anwendung, die die für die Haltbarkeit des Alkalihydrosulfits nötige Menge festes Alkalisulfit bereits enthalten, da sich gezeigt hat, daß in derartigen trockenen Gemischen die Haltbarkeit -des Alkalihydrosulfits nicht vermindert wird. Selbstverständlich kann man an Stelle von Alkalisulfit auch äquivalente Gemische, wie Alkalibisulfit oder Alkalipyrosulfit und Alkalicarbonat bzw. Alkalibicarbonat, verwenden.Surprisingly, it has been found that this decomposition of the alkali metal hydrosulfite can be achieved and the associated evils can easily be avoided if one the alkali hydrosulfite in the presence of sulfites, preferably alkali sulfites, such as for example sodium sulfite, brings into solution. It is expedient to bring dry mixtures to use the amount necessary for the shelf life of the alkali hydrosulfite Alkali sulfite already included, since it has been shown that in such dry Mixtures the shelf life of the alkali hydrosulphite is not reduced. Of course Instead of alkali sulphite, equivalent mixtures such as alkali bisulphite can also be used or alkali pyrosulphite and alkali carbonate or alkali bicarbonate.

Claims (1)

PATE- N'rANSPRÜCHG: i. Verfahren zum Erhöhen der Haltbar keit von Mkalihydrosulfitlösungen, da durch gekennzeichnet, daß zu den neutra len oder schwach alkalischen Lösunger der Hydrosulfite Sulfit, vorzugsweise Al kalisulfit, zugesetzt wird. a. Verfahren nach Anspruch i, dadurcl gekennzeichnet, daß trockene Gemisch( von Alkalihydrosulfit und Alkalisulfit ir Lösung gebracht werden. PATENT CLAIM: i. Process for increasing the shelf life of potassium hydroxide solutions, characterized in that the hydrosulfite sulfite, preferably alkali metal sulfite, is added to the neutral or weakly alkaline solution. a. Process according to claim 1, characterized in that dry mixtures (of alkali hydrosulphite and alkali sulphite are brought into solution.
DEV19651D 1924-11-16 1924-11-16 Increasing the shelf life of alkali hydrosulfite Expired DE453409C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEV19651D DE453409C (en) 1924-11-16 1924-11-16 Increasing the shelf life of alkali hydrosulfite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV19651D DE453409C (en) 1924-11-16 1924-11-16 Increasing the shelf life of alkali hydrosulfite

Publications (1)

Publication Number Publication Date
DE453409C true DE453409C (en) 1927-12-08

Family

ID=7578003

Family Applications (1)

Application Number Title Priority Date Filing Date
DEV19651D Expired DE453409C (en) 1924-11-16 1924-11-16 Increasing the shelf life of alkali hydrosulfite

Country Status (1)

Country Link
DE (1) DE453409C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027369A1 (en) * 1979-10-12 1981-04-22 Thiokol Corporation Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form
EP0153671A2 (en) * 1984-02-22 1985-09-04 BASF Aktiengesellschaft Stabilized aqueous alkalised composition of sodiumdithionite

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027369A1 (en) * 1979-10-12 1981-04-22 Thiokol Corporation Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form
EP0153671A2 (en) * 1984-02-22 1985-09-04 BASF Aktiengesellschaft Stabilized aqueous alkalised composition of sodiumdithionite
EP0153671A3 (en) * 1984-02-22 1986-12-30 Basf Aktiengesellschaft Stabilized aqueous alkalised composition of sodiumdithionite

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