GB472754A - Process for purifying caustic-soda lyes - Google Patents

Process for purifying caustic-soda lyes

Info

Publication number
GB472754A
GB472754A GB14037/37A GB1403737A GB472754A GB 472754 A GB472754 A GB 472754A GB 14037/37 A GB14037/37 A GB 14037/37A GB 1403737 A GB1403737 A GB 1403737A GB 472754 A GB472754 A GB 472754A
Authority
GB
United Kingdom
Prior art keywords
water
soda
caustic
2naoh
heptahydrate
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
GB14037/37A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB472754A publication Critical patent/GB472754A/en
Expired legal-status Critical Current

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
    • C01D1/30—Purification; Separation by crystallisation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

In the purification of caustic-soda lyes by the formation and separation of sodium hydroxide heptahydrate (2NaOH.7H2O), the heptahydrate after mechanical separation (e.g. by centrifuging) is freed from adhering mother liquor by displacement with water at a temperature of 10--14 DEG C. Preferably, the amount of water used is smaller than the volume of the mother liquor to be displaced. The preparation of 2NaOH.7H2O from electrolytic caustic soda by concentrating the lye to 50 per cent, separating solid sodium chloride, diluting with water to 38 per cent and cooling to about 14 DEG C., as set forth in German Specification 347,816, is referred to.
GB14037/37A 1936-07-23 1937-05-20 Process for purifying caustic-soda lyes Expired GB472754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE472754X 1936-07-23

Publications (1)

Publication Number Publication Date
GB472754A true GB472754A (en) 1937-09-29

Family

ID=6541473

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14037/37A Expired GB472754A (en) 1936-07-23 1937-05-20 Process for purifying caustic-soda lyes

Country Status (1)

Country Link
GB (1) GB472754A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983215A (en) * 1973-07-19 1976-09-28 Ajinomoto Co., Inc. Process for preparing NaOH.3.5 H2 O crystals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983215A (en) * 1973-07-19 1976-09-28 Ajinomoto Co., Inc. Process for preparing NaOH.3.5 H2 O crystals

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