GB612530A - Evaporating caustic soda solutions - Google Patents

Evaporating caustic soda solutions

Info

Publication number
GB612530A
GB612530A GB9116/46A GB911646A GB612530A GB 612530 A GB612530 A GB 612530A GB 9116/46 A GB9116/46 A GB 9116/46A GB 911646 A GB911646 A GB 911646A GB 612530 A GB612530 A GB 612530A
Authority
GB
United Kingdom
Prior art keywords
per cent
per
solution
caustic soda
ton
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
GB9116/46A
Inventor
Cie Solvay
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.)
FRANCIS MANDEVILLE JOSCELYNE
JOHN CHARLES HENRY MCENTEE
Imperial Chemical Industries Ltd
Original Assignee
FRANCIS MANDEVILLE JOSCELYNE
JOHN CHARLES HENRY MCENTEE
Imperial Chemical Industries Ltd
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 FRANCIS MANDEVILLE JOSCELYNE, JOHN CHARLES HENRY MCENTEE, Imperial Chemical Industries Ltd filed Critical FRANCIS MANDEVILLE JOSCELYNE
Priority to GB6243/47A priority Critical patent/GB612603A/en
Priority to GB9116/46A priority patent/GB612530A/en
Priority to US736423A priority patent/US2556184A/en
Priority to NL131168A priority patent/NL77144C/nl
Priority to CH275158D priority patent/CH275158A/en
Priority to BE472116A priority patent/BE472116A/en
Priority to BE472117A priority patent/BE472117A/en
Priority to FR943963D priority patent/FR943963A/en
Priority to DEP309D priority patent/DE819689C/en
Publication of GB612530A publication Critical patent/GB612530A/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
    • C01D1/42—Concentration; Dehydration
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/20—Halides
    • C01F11/24—Chlorides
    • C01F11/30—Concentrating; Dehydrating; Preventing the adsorption of moisture or caking

Abstract

Solid caustic soda containing less than 1 per cent water is obtained from an aqueous solution containing between 80 per cent and 95 per cent NaOH by exposing a surface area exceeding 10 and preferably 100 square metres per ton, of the solution at a temperature between 200 DEG and 300 DEG C. to a gas or vapour in which the partial water vapour pressure is kept below 600 mm., under adiabatic conditions or under such thermal conditions that not more than 80 ton calories are gained by the system, or not more than 40 ton calories are lost, per ton of product. The ideal process, which is both adiabatic and isothermal, is represented by the use of 90 to 92 per cent caustic soda solution at 270 DEG C. and is an auto-evaporative-crystallization process. In an example, a 89.5 per cent NaOH solution at 270 DEG C. is sprayed down a vertical empty tower, 15 feet high, in which the pressure is maintained at 5 lbs. per square inch. A granular product containing 0.2 per cent water and having an apparent density of 0.4 grams per c.c. is obtained. In a modification, a 92 per cent NaOH solution at 280 DEG C. is sprayed down a tower up which air at 250 DEG C. is blown. Film evaporation may also be used, employing (a) a heat-insulated ribbon mixer in which the solution is evaporated on the surface of granular caustic soda in a current of air; this gives a coarse sandy product with an apparent density of 0.9 to 1.1 grams per c.c.; or (b) a horizontal drum rotating partly in a bath of 89 per cent NaOH at 280 DEG C. and partly in the air. In all cases, the initial starting solution may be prepared in a conventional, forced circulation, tubular evaporator using diphenyl vapour as heating medium. Specification 612,603 is referred to.
GB9116/46A 1946-03-25 1946-03-25 Evaporating caustic soda solutions Expired GB612530A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
GB6243/47A GB612603A (en) 1946-03-25 1946-03-25 Evaporating calcium chloride solutions
GB9116/46A GB612530A (en) 1946-03-25 1946-03-25 Evaporating caustic soda solutions
US736423A US2556184A (en) 1946-03-25 1947-03-21 Anhydrous calcium chloride process
NL131168A NL77144C (en) 1946-03-25 1947-03-22
CH275158D CH275158A (en) 1946-03-25 1947-03-25 Process for the production of solid calcium chloride.
BE472116A BE472116A (en) 1946-03-25 1947-03-25 Manufacture of calcium chloride
BE472117A BE472117A (en) 1946-03-25 1947-03-25 Manufacture of calcium chloride
FR943963D FR943963A (en) 1946-03-25 1947-03-26 Manufacture of calcium chloride
DEP309D DE819689C (en) 1946-03-25 1948-10-27 Process for the production of solid calcium chloride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9116/46A GB612530A (en) 1946-03-25 1946-03-25 Evaporating caustic soda solutions

Publications (1)

Publication Number Publication Date
GB612530A true GB612530A (en) 1948-11-15

Family

ID=26239558

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9116/46A Expired GB612530A (en) 1946-03-25 1946-03-25 Evaporating caustic soda solutions
GB6243/47A Expired GB612603A (en) 1946-03-25 1946-03-25 Evaporating calcium chloride solutions

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB6243/47A Expired GB612603A (en) 1946-03-25 1946-03-25 Evaporating calcium chloride solutions

Country Status (7)

Country Link
US (1) US2556184A (en)
BE (2) BE472116A (en)
CH (1) CH275158A (en)
DE (1) DE819689C (en)
FR (1) FR943963A (en)
GB (2) GB612530A (en)
NL (1) NL77144C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635684A (en) * 1949-05-24 1953-04-21 Ici Ltd Manufacture of caustic soda granules
US2882126A (en) * 1954-11-18 1959-04-14 Columbia Southern Chem Corp Chemical process
US2857244A (en) * 1955-01-03 1958-10-21 Allied Chem Process for the manufacture of highdensity, anhydrous calcium chloride
US2839360A (en) * 1955-02-24 1958-06-17 Michigan Chem Corp Method for reducing the concentration of alkali metal salts in calcium chloride brines
NL131806C (en) * 1963-06-13
US3250593A (en) * 1964-04-27 1966-05-10 Dow Chemical Co Method of producing calcium chloride pellets
JPS5851974A (en) * 1981-09-21 1983-03-26 Kobe Steel Ltd Recovery of cacl2 from exhaust gas-desulfurizing waste liquid
DE3727171A1 (en) * 1987-08-14 1989-02-23 Krupp Gmbh Process for the preparation of absolute ethanol

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1026724A (en) * 1912-05-21 E N Trump Porous granular hygroscopic material.
US996832A (en) * 1907-10-02 1911-07-04 Charles H Campbell Desiccating milk.
US1166225A (en) * 1913-07-28 1915-12-28 Georg Alexander Krause Process of desiccation.
AT96934B (en) * 1921-06-04 1924-05-10 Kummler & Matter Ag Process for evaporating salt solutions.
US1592971A (en) * 1925-09-26 1926-07-20 Dow Chemical Co Prepared metallic chloride and method of making same
US1660053A (en) * 1925-10-12 1928-02-21 Dow Chemical Co Prepared calcium chloride and method of making same
US1852303A (en) * 1928-11-06 1932-04-05 Dow Chemical Co Calcium chloride and method of making same
US1877733A (en) * 1930-09-24 1932-09-13 Texas Chemical Products Compan Anhydrous metallic chlorides and their preparation
US1907988A (en) * 1931-06-04 1933-05-09 Pittsburgh Plate Glass Co Preparation of anhydrous caustic
US1958034A (en) * 1933-07-03 1934-05-08 Dow Chemical Co Processing calcium chloride solution
US2032727A (en) * 1934-05-31 1936-03-03 Solvay Process Co Purification of calcium chloride brines
US2154672A (en) * 1935-10-12 1939-04-18 Calorider Corp Formed bodies of solid calcium chloride hydrate

Also Published As

Publication number Publication date
FR943963A (en) 1949-03-23
DE819689C (en) 1951-11-05
CH275158A (en) 1951-05-15
BE472117A (en) 1947-09-15
GB612603A (en) 1948-11-15
BE472116A (en) 1947-09-15
US2556184A (en) 1951-06-12
NL77144C (en) 1954-09-15

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