Leather composite red-brown dye synthesis process

A synthesis process, a reddish-brown technology, applied in the direction of organic dyes, disazo dyes, etc., can solve the problems of unsuitability for large-scale production, complex production process, low production efficiency, etc., to improve the single-pass conversion rate and the production of products. efficiency, overcoming many processes, and improving work efficiency

Inactive Publication Date: 2016-06-08
赵建英
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  • Summary
  • Abstract
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Problems solved by technology

In the current synthesis process of leather composite reddish-brown dye, the process flow is not easy to implement, the resulting reddish-brown dyed product has low purity, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and the cost is high, so it is not suitable for large-scale production. mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] The leather composite reddish-brown dye synthesis technique of the present embodiment comprises the following steps:

[0014] (1) Ingredients: 4.4'-diaminoanilide and 4.4'-diaminobenzenesulfonanilide, hydrochloric acid, sodium nitrite are mixed according to the molar ratio;

[0015] (2) Diazotization: under the conditions of temperature T=12°C and pH=2.5, the reaction time is 1.5 hours;

[0016] (3) Primary coupling: add salicylic acid, under the conditions of temperature 9°C and PH=10, the reaction time is 4.5 hours;

[0017] (4) Secondary coupling: add r-acid, under the conditions of temperature 22°C and pH=11, the reaction time is 5 hours;

[0018] (5) Drying: Spray drying to produce finished products.

[0019] The synthesis process of leather composite reddish-brown dye does not require cumbersome post-reaction treatment, greatly improves product performance, and is environmentally friendly and pollution-free. The process is easy to implement, with low production ...

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PUM

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Abstract

The present invention discloses a leather composite red-brown dye synthesis process, which comprises material preparing, diazotization, first coupling, second coupling, and spray drying. According to the present invention, the two intermediates having the similar molecule structure and the close molecular weight are selected, wherein one can produce the direct dye, and the other can produce the weak acid dye, the diazotization conditions, the coupling conditions and the used coupling components of the two intermediates are the same, and after the two intermediates are mixed, the diazotization reaction can be performed in the same reaction tank.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of leather composite reddish-brown dye. Background technique [0002] The synthesis process of leather composite reddish-brown dye includes at least drying, diazotization, coupling and other processes. In the current synthesis process of leather composite reddish-brown dye, the process is not easy to implement, the resulting reddish-brown dyed product has low purity, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and the cost is high, so it is not suitable for large-scale production. mass production. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a synthetic process for leather composite reddish-brown dye. The present invention not only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/22C09B67/36C09B35/32
Inventor 赵建英
Owner 赵建英
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