- 2 - (N-substituted amino) - 5-naphthol-7-sulfonic acid clean production process (by machine translation)
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This invention belongs to the dyeing industry, relates to a new material in the field of technology of the dye intermediates, in particular 2 - (N-substituted amino) - 5-naphthol-7-sulfonic acid clean production process. To improve the quality of this invention, waste water is greatly reduced. 2 - (N-substituted amino) - 5-naphthol-7-sulfonic acid clean production process, the method comprises the following steps: A, condensation reaction; B, material after treatment; C, refining the filter cake. And the recovery and reuse of the filtrate. The method of the present invention that are used in the can be of various raw materials are purchased from the market, the compounds of the present invention and the use of the preparation process of the security process is, environmental protection, energy-saving. (by machine translation)
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Paragraph 0051-0057
(2017/03/28)
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- Azo dyestuffs
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Azo dyestuffs, which in the acid form, are represented by the formula: wherein A is an aromatic radical, M is a 1,4-benzene radical which may be substituted, E is the residue of a coupling component which is free from azo groups, At least one of A and M containing a phosphonic acid group, and the metal complexes of those having a metallisable group are reactive dyes suitable for use in the process of German OLS No. 2324809.
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