GB934105A - Improvements in or relating to chromic acid manufacture - Google Patents

Improvements in or relating to chromic acid manufacture

Info

Publication number
GB934105A
GB934105A GB22033/60A GB2203360A GB934105A GB 934105 A GB934105 A GB 934105A GB 22033/60 A GB22033/60 A GB 22033/60A GB 2203360 A GB2203360 A GB 2203360A GB 934105 A GB934105 A GB 934105A
Authority
GB
United Kingdom
Prior art keywords
bichromate
chromic acid
alkali metal
mother liquor
crystals
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
GB22033/60A
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.)
Diamond Shamrock Corp
Original Assignee
Diamond Alkali Co
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 Diamond Alkali Co filed Critical Diamond Alkali Co
Publication of GB934105A publication Critical patent/GB934105A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/02—Oxides or hydrates thereof
    • C01G37/033—Chromium trioxide; Chromic acid

Landscapes

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

Abstract

Chromic acid is prepared by reacting an aqueous solution of an alkali metal bichromate of 88% by weight concentration, mother liquor from a previous reaction and 100% sulphuric acid at 50 DEG to 75 DEG C. to form a slurry of chromic acid crystals, filtering off the chromic acid crystals, cooling the filtrate to 20 DEG to 25 DEG C. to crystallize alkali metal bisulphate, filtering off the alkali metal bisulphate crystals, and recycling the mother liquor for further reaction with 88% bichromate solution and 100% sulphuric acid. When the process is started and no mother liquor is available, a 70% solution of bichromate is reacted with 93 to 95% sulphuric acid to form a slurry of chromic acid crystals which is treated as above, the mother liquor so obtained being recycled and reacted with 88% bichromate solution and 100% sulphuric acid. The chromic acid crystals are melted and pure chromic acid recovered. The alkali metal bisulphate obtained may be reacted with alkali metal chromate to obtain bichromate for use in the process of the invention. The bichromate is usually sodium bichromate, but potassium, lithium, casein and rubidium bichromates may be used.
GB22033/60A 1959-06-26 1960-06-23 Improvements in or relating to chromic acid manufacture Expired GB934105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US823212A US2993756A (en) 1959-06-26 1959-06-26 Method for preparing chromic acid

Publications (1)

Publication Number Publication Date
GB934105A true GB934105A (en) 1963-08-14

Family

ID=25238099

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22033/60A Expired GB934105A (en) 1959-06-26 1960-06-23 Improvements in or relating to chromic acid manufacture

Country Status (2)

Country Link
US (1) US2993756A (en)
GB (1) GB934105A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045590A1 (en) * 1980-08-02 1982-02-10 BRITISH CHROME & CHEMICALS LIMITED Production of chromium trioxide
US5034211A (en) * 1990-10-29 1991-07-23 Occidental Chemical Corporation Reducing turbidity in chromic acid solutions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5393503A (en) * 1991-09-09 1995-02-28 Occidental Chemical Corporation Process for making chromic acid

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2034256A (en) * 1930-05-27 1936-03-17 Natural Products Refining Co Process for producing chromic acid
US2632688A (en) * 1952-02-15 1953-03-24 Diamond Alkali Co Production of chromium trioxide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045590A1 (en) * 1980-08-02 1982-02-10 BRITISH CHROME & CHEMICALS LIMITED Production of chromium trioxide
US5034211A (en) * 1990-10-29 1991-07-23 Occidental Chemical Corporation Reducing turbidity in chromic acid solutions

Also Published As

Publication number Publication date
US2993756A (en) 1961-07-25

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