C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/531.1
C07C 51/43 (2006.01) C07C 65/11 (2006.01)
Patent
CA 1304402
HOE 88/F 006 Abstract of the disclosure: Process for the purification of 2-hydroxynaphthalene-6- carboxylic acid The invention relates to a process for the purification of Z-hydroxynaphthalene-6-carboxylic acid by recrystalliza- tion. In this process, the crude acid is recrystallized from water-miscible linear or cyclic aliphatic ethers, aliphatic polyethers or aliphatic hydroxy ethers or from at least 10 % strength by weight aqueous solutions of these ethers. Recrystallization from a 35 - 90 % strength by weight aqueous solution of 1,4-dioxane is particularly preferred.
588138
Neeb Rudolf
Plessen Helmold von
Rittner Siegbert
Volk Heinrich
Wykypiel Werner
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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