CONTINUOUS CHROMIC ACID PROCESS AND APPARATUS

1,264,430. Chromic acid. DIAMOND SHAMROCK CORP. 17 April, 1970 [18 April, 1969], No. 18529/70. Heading C1A. A process for producing purified chromic acid comprises establishing a molten heel of bisulphate in a melter-decanter unit (1), continuously introducing crude chromic acid into the molten bisu...

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Bibliographic Details
Main Authors THOMAS S. PERRIN, ROBERT G. BANNER, JOHN O. BRANDSTAETTER
Format Patent
LanguageEnglish
Published 21.09.1971
Subjects
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
INORGANIC CHEMISTRY
METALLURGY
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Summary:1,264,430. Chromic acid. DIAMOND SHAMROCK CORP. 17 April, 1970 [18 April, 1969], No. 18529/70. Heading C1A. A process for producing purified chromic acid comprises establishing a molten heel of bisulphate in a melter-decanter unit (1), continuously introducing crude chromic acid into the molten bisulphate, agitating and heating to maintain molten, whereby the chromic acid settles to the bottom and is withdrawn from the bottom by means of siphon 9 while waste bisulphate is withdrawn from an overflow tube. The retention time may be varied by adjusting the position of the take-off tube and the chromic acid may be added as crude chromic acid or as sodium bichromate and sulphuric acid. In the apparatus (see drawing), the stainless steel vessel 1 is heated by means of strip heaters 3 and has a well 5 for the chromic acid layer 7, and carries a Y-shaped chromic acid exit tube 9 having one arm extending through the bottom of the well and the second arm extending to a point just above the bottom of the well, the tube being adjustable vertically. The bisulphate overflow tube 13 is likewise adjustable and is screened by a baffle 23. A vibratory feed shoot 17 is used to supply chromic acid crystals.
Bibliography:Application Number: USD3607026