Process for preparing lithium salts of anionic dyes having...

Details Process for preparing lithium salts of anionic dyes having... Process for preparing lithium salts of anionic dyes having...

C - Chemistry, Metallurgy

09

B

260/236, 260/168

C09B 1/34 (2006.01) C09B 43/00 (2006.01) C09B 62/02 (2006.01) C09B 62/44 (2006.01) C09B 69/02 (2006.01)

Patent

CA 1253858

Abstract of the discLosure: Process for preparing Lithium saLts of anionic dyes hav- ing preferabLy fiber-reactive groups Lithium saLts of anionic dyes are prepared by first con- verting another saLt of this anionic dye in aqueous soLu- tion or suspension by means of a compound which reLeases caLcium ions into the water-insoLubLe or sparingLy water-soLubLe caLcium saLt of the dye, which is separated from the aqueous medium and is then converted to an aque- ous suspension by treatment with Lithium suLfate or Lithium hydrogensuLfate or a mixture thereof in an equi vaLent amount of each or in an excess of up to 10% into its Lithium saLt.

496274

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