US1877368A - Process for drying natural sodium carbonate - Google Patents

Process for drying natural sodium carbonate Download PDF

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Publication number
US1877368A
US1877368A US354174A US35417429A US1877368A US 1877368 A US1877368 A US 1877368A US 354174 A US354174 A US 354174A US 35417429 A US35417429 A US 35417429A US 1877368 A US1877368 A US 1877368A
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sodium carbonate
natural sodium
drying
drying natural
salt
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US354174A
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Seyer William Fred
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D7/00—Carbonates of sodium, potassium or alkali metals in general
    • C01D7/35—Varying the content of water of crystallisation or the specific gravity

Definitions

  • 'My invention relates to a certain new and useful process of drying sodium carbonate dekahydrate or commonly known'as sal soda, or sodium sulphate.
  • Sodium carbonate and sodium sulphate dekahydrates have a combined water con tent of 66% and 56% respectively and will melt at 3 1- degrees centigrade at atmospheric pressure, on melting the salt an unstable modification or a heptahydrate results,
  • the monohydrate be- 2 ing more soluble in cold than in hot water prohibits the use of heated metallic surfaces as drying agents, since a saline scale or crust forms thereon and becomes substantially insoluble, this crust also forming so a non-conductor of heat and cold so that the heat employed to heat the coated surface is incapable of being'efiectively used for evaporating the combined moisture from the salt.
  • the scaling may be reduced but not entirely avoided, but if small amounts of finely divided foreign substances such as 001- loidal mud are present, the heated surfaces again become coated and the process hamp- 40 cred.
  • the value of the coating of th e dekahydrateparticles lies in providing them with a substance which restricts or controls the speedof evaporation of the combined moisture therefrom and prevents the. rapid evaporation of moisture and melting of the salt which causes what is technically known j drying a dekahydrate salt which consists of reducing vits granules to a diameter between 0.5 mm; and '2mm., coating the said granules with a dry salt of the same kind and of-eva-porating the moisture fromthe mass.

Description

10 adopt such treatment.
Patented Sept. 13, 1932 UNITED STATES WILLIAM FRED sEYER, or VANCOUVER, BRITISH COLU IA, CANADA.
rnoonss FOR marine NATURAL soDIUMcARBoNA'rE 7 N Drawing. Application filed April- 10, 1929, Serial 354,174, and in Canada A rn 10,1928.
'My invention relates to a certain new and useful process of drying sodium carbonate dekahydrate or commonly known'as sal soda, or sodium sulphate. I
5 While it is known that sodium carbonate and sodium sulphate dekahydrates can be dried in small quantities by heating them to evaporate their moisture contents, it has:
not been found commercially practical to The sodium carbonates and sodium sulphates are essentially similar in characteristics, so that the ei iicient treatment of one will be found equally efiicient with the other and in a like manner the difficulties to be overcome in drying are substantially identical.
Sodium carbonate and sodium sulphate dekahydrates have a combined water con tent of 66% and 56% respectively and will melt at 3 1- degrees centigrade at atmospheric pressure, on melting the salt an unstable modification or a heptahydrate results,
which breaks down into a stable modification or a monohydra-tc. The monohydrate be- 2 ing more soluble in cold than in hot water prohibits the use of heated metallic surfaces as drying agents, since a saline scale or crust forms thereon and becomes substantially insoluble, this crust also forming so a non-conductor of heat and cold so that the heat employed to heat the coated surface is incapable of being'efiectively used for evaporating the combined moisture from the salt. By providing a source of violent agitation the scaling may be reduced but not entirely avoided, but if small amounts of finely divided foreign substances such as 001- loidal mud are present, the heated surfaces again become coated and the process hamp- 40 cred.
By my process I take one part of dekahy mm. The subjection of either of the salts P rENr O F CE" to a drying process for a suitable time will result in all but about one tenth of one per cent of combined water being driven'ofi'. Physically adhering water, if any, will also be driven oft; V i
The value of the coating of th e dekahydrateparticles lies in providing them with a substance which restricts or controls the speedof evaporation of the combined moisture therefrom and prevents the. rapid evaporation of moisture and melting of the salt which causes what is technically known j drying a dekahydrate salt which consists of reducing vits granules to a diameter between 0.5 mm; and '2mm., coating the said granules with a dry salt of the same kind and of-eva-porating the moisture fromthe mass.
Dated at Vancouver, B. 0., this 3rd day of April, 1929.
7 WILLIAM FRED SEYER. i r
US354174A 1928-04-10 1929-04-10 Process for drying natural sodium carbonate Expired - Lifetime US1877368A (en)

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CA1877368X 1928-04-10

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2895806A (en) * 1946-02-11 1959-07-21 Zachary D Sheldon Method for determining the stability of fluorocarbon oils
US4039617A (en) * 1975-06-17 1977-08-02 Allied Chemical Corporation Recovery of soda values and heat from sodium carbonate crystallizer purge liquors
US5198145A (en) * 1990-11-08 1993-03-30 Fmc Corporation Dry detergent compositions
EP0742175A2 (en) * 1995-05-10 1996-11-13 SOLVAY MINERALS, Inc. Process for production of dense soda ash from soda ash fines
US20150140156A1 (en) * 2013-11-20 2015-05-21 Thomas W. Palone Non-deformable patterned template

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2895806A (en) * 1946-02-11 1959-07-21 Zachary D Sheldon Method for determining the stability of fluorocarbon oils
US4039617A (en) * 1975-06-17 1977-08-02 Allied Chemical Corporation Recovery of soda values and heat from sodium carbonate crystallizer purge liquors
US5198145A (en) * 1990-11-08 1993-03-30 Fmc Corporation Dry detergent compositions
EP0742175A2 (en) * 1995-05-10 1996-11-13 SOLVAY MINERALS, Inc. Process for production of dense soda ash from soda ash fines
EP0742175A3 (en) * 1995-05-10 1998-01-07 SOLVAY MINERALS, Inc. Process for production of dense soda ash from soda ash fines
US5759507A (en) * 1995-05-10 1998-06-02 Solvay Minerals, Inc. Process for production of dense soda ash from soda ash fines
US20150140156A1 (en) * 2013-11-20 2015-05-21 Thomas W. Palone Non-deformable patterned template

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