GB724246A - Improvements in or relating to the manufacture of solid chromic anhydride - Google Patents

Improvements in or relating to the manufacture of solid chromic anhydride

Info

Publication number
GB724246A
GB724246A GB2473552A GB2473552A GB724246A GB 724246 A GB724246 A GB 724246A GB 2473552 A GB2473552 A GB 2473552A GB 2473552 A GB2473552 A GB 2473552A GB 724246 A GB724246 A GB 724246A
Authority
GB
United Kingdom
Prior art keywords
chromic anhydride
alkali metal
solution
dichromate
washed
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
GB2473552A
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
Priority to GB2473552A priority Critical patent/GB724246A/en
Publication of GB724246A publication Critical patent/GB724246A/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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

A concentrated solution of alkali metal dichromate is treated at 50-65 DEG C. with concentrated sulphuric acid, preferably in the proportion of 3-4 mols of acid per mol of dichromate, and the precipitated crystals of chromic anhydride are separated from the solution and washed with a saturated solution of the alkali metal dichromate, the amount of washing solution being 0.05-0.2 times the weight of the precipitate. The washed crystals, which contain chromic anhydride and alkali metal bisulphate are useful for many purposes such as the treatment of certain metals. In order to obtain pure chromic anhydride, the washed crystals are heated to fusion and allowed to stratify into an upper layer of dross and a lower layer of pure chromic anhydride which is separately drawn off.
GB2473552A 1952-02-15 1952-02-15 Improvements in or relating to the manufacture of solid chromic anhydride Expired GB724246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2473552A GB724246A (en) 1952-02-15 1952-02-15 Improvements in or relating to the manufacture of solid chromic anhydride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2473552A GB724246A (en) 1952-02-15 1952-02-15 Improvements in or relating to the manufacture of solid chromic anhydride

Publications (1)

Publication Number Publication Date
GB724246A true GB724246A (en) 1955-02-16

Family

ID=10216429

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2473552A Expired GB724246A (en) 1952-02-15 1952-02-15 Improvements in or relating to the manufacture of solid chromic anhydride

Country Status (1)

Country Link
GB (1) GB724246A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2449063A1 (en) * 1979-02-17 1980-09-12 British Chrome Chemicals Ltd PROCESS FOR THE PURIFICATION OF CRUDE CHROME TRIOXIDE AND PRODUCT OBTAINED BY THIS PROCESS
CN116947269A (en) * 2023-09-20 2023-10-27 成都铬科高化工技术有限责任公司 Method for recycling chromium and sodium salt from chromium-containing sodium bisulfate wastewater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2449063A1 (en) * 1979-02-17 1980-09-12 British Chrome Chemicals Ltd PROCESS FOR THE PURIFICATION OF CRUDE CHROME TRIOXIDE AND PRODUCT OBTAINED BY THIS PROCESS
US4291000A (en) * 1979-02-17 1981-09-22 British Chrome & Chemicals Limited Process for the production of chromium trioxide
CN116947269A (en) * 2023-09-20 2023-10-27 成都铬科高化工技术有限责任公司 Method for recycling chromium and sodium salt from chromium-containing sodium bisulfate wastewater
CN116947269B (en) * 2023-09-20 2023-12-05 成都铬科高化工技术有限责任公司 Method for recycling chromium and sodium salt from chromium-containing sodium bisulfate wastewater

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