GB417331A - Process for the manufacture of potassium dichromate - Google Patents

Process for the manufacture of potassium dichromate

Info

Publication number
GB417331A
GB417331A GB9997/33A GB999733A GB417331A GB 417331 A GB417331 A GB 417331A GB 9997/33 A GB9997/33 A GB 9997/33A GB 999733 A GB999733 A GB 999733A GB 417331 A GB417331 A GB 417331A
Authority
GB
United Kingdom
Prior art keywords
bichromate
oxygen
chromic oxide
chromic
caustic potash
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
GB9997/33A
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 GB417331A publication Critical patent/GB417331A/en
Expired legal-status Critical Current

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  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Potassium bichromate is produced by heating chromic oxide or a substance containing it, for example, chromic hydroxide, in admixture with an amount of caustic potash not more than sufficient, and preferably about half that required, for conversion of the total quantity of the chromic oxide into bichromate, in the presence of oxygen or a gas containing uncombined oxygen, e.g. air, at atmospheric pressure and at a temperature above 250 DEG C., but below the decomposition temperature of the bichromate. Oxidation is effected solely by means of free oxygen. An operating temperature of 300--380 DEG C. is suitable. The chromic oxide is suitably mixed with an aqueous solution of the caustic potash. Mixing may be effected in a ball mill, and the reaction take place in a rotating dish.
GB9997/33A 1932-04-04 1933-04-03 Process for the manufacture of potassium dichromate Expired GB417331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE417331X 1932-04-04

Publications (1)

Publication Number Publication Date
GB417331A true GB417331A (en) 1934-10-03

Family

ID=6448697

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9997/33A Expired GB417331A (en) 1932-04-04 1933-04-03 Process for the manufacture of potassium dichromate

Country Status (1)

Country Link
GB (1) GB417331A (en)

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