Direct orange S dye preparation process

Abstract

The invention relates to a direct orange S dye preparation process. Compared with an old process, the process is mainly characterized in that salting-out, filtration and crushing procedures are removed, raw stock is directly used for spray-drying, raw auxiliary materials are omitted, 20% of sodium chloride added in proportion in a traditional method is omitted, products treated by a spray drying tower are good in consistency, and time, coal, power, steam and the like are saved. The direct orange S dye preparation process has the advantages that clean production without wastewater discharge is achieved, energy resources are saved, traditional production process conditions of direct orange S dyes are changed, the production process is simplified, production cost is reduced, product quality is effectively improved, production yield is improved, production capacity is improved, the problem of environmental pollution caused by wastewater is fundamentally solved, and the preparation process has high commercial values and meets environment-friendly sustainable development.

Description

technical field [0001] The invention belongs to the technical field of dye preparation, and relates to a preparation process of a dye, in particular to a preparation process of a direct orange S dye. The international standard number of the direct orange S is C.I:26. Background technique [0002] Direct Orange S, alias Direct Golden S, Direct Orange BS, Direct Orange, Direct Bright Red 2G, dye index number is C.I.Direct Orange 26 (29150), molecular formula C 33 h 22 N 6 Na 2 o 9 S, molecular weight 757.03, CAS: 3626-36-6. Appearance is reddish brown powder, soluble in water is red light orange brown, solubility (80°C) is 10g / L, slightly soluble in ethanol is golden orange. In case of concentrated sulfuric acid, it is bright red, and after dilution, there will be red light orange to red precipitate. Adding concentrated sodium hydroxide to the aqueous dye solution turns orange-brown; adding 10% sodium hydroxide solution turns yellow slightly, lk concentrated hydrochloric...

AI Technical Summary

Problems solved by technology

[0006] 2. The dye components are separated by salting out or acid out, the product purity is not high, and the quality consistency of different batches of products is also poor, which greatly limits the product quality

[0007] 3. Since a large amount of sodium chloride is used in the salting out process, a large amount of waste water will be produced. The discharge of waste water will not only waste the useful substances such as chemical raw materials and intermediates contained in it, but also cause great pollution to the environment. Seriously restricting the sustainable development of the dye industry

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