Process for preparing alkali metal salts of...

C - Chemistry – Metallurgy – 07 – C

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260/522.2

C07C 51/367 (2006.01) C07C 59/305 (2006.01) C11D 3/20 (2006.01)

Patent

CA 1315292

05-21(6763)A ABSTRACT There is disclosed herein improved processes for the preparation of mixtures of alkali metal salts of 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylate and alkali metal salts of 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylate wherein by-product calcium carbonate produced by the process of making such mixtures is employed in a recycle pattern to prepare additional amounts of mixtures of said compounds.

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