Method for producing direct yellow blend dye

Abstract

The invention relates to a method for producing a direct yellow blend dye. The method includes the steps of conducting a diazo reaction, conducting a coupled reaction, conducting a first condensation reaction, conducting a second condensation reaction, conducting a third condensation reaction and conducting spray drying on a product to obtain the direct yellow blend dye. According to the method, on the premise of not changing the quality standards of an original product, the spray drying cleaner production mode is adopted, waste residuals and process wastewater are not generated, the technological process is simplified, investment of equipment is reduced, production efficiency is improved by 10 percent, the yield of the products is improved by 3 percent, the production cost is saved by 10 percent, and the method is an environmentally friendly dye production method.

Description

technical field [0001] The invention relates to a production method of directly blending yellow dye, in particular to a production method of directly blending yellow dye D-3RNL. Background technique [0002] Direct blended yellow dye D-3RNL is a new dye that supports the "one-step-one-bath" dyeing process of polyester / cotton and polyester / viscose blended fibers, and the "one-step-one-bath" dyeing of polyester / cotton and polyester / viscose blended fibers supported by it The process can greatly reduce the discharge of printing and dyeing wastewater, save energy consumption, save working hours, and has the advantages of simple process, safety, money saving and practical effect. In addition, it is one of the ternary colors of direct blended dyes, which can be dyed in a single color or blended with other direct blended dyes. It has a wide range of applications and a large amount of use. [0003] The structural formula of the direct blending yellow dye D-3RNL is as follows: [00...

AI Technical Summary

Problems solved by technology

However, it has been found in practice that not all dyes can be dried by spray drying, either the dye products that meet the standard requirements cannot be obtained, or the product quality is greatly reduced during the spray drying process

[0007] Chinese Invention Patent Publication CN103013169A discloses a spray drying method for an aqueous solution of azo organic dyes. It is believed that the high temperature stability of azo dyes is relatively poor. During the spray drying process, high temperature air will cause thermal decomposition of the product and cause coking Phenomenon, resulting in darker product color and significantly lower dye strength

Therefore, it proposes the solution of adding an appropriate amount of anti-scorching agent, but this solution is actually only effective for some dark dyes, and for light-colored dyes, adding an anti-scorching agent will affect the application effect of the dye product

For the direct blended yellow dye D-3RNL, the problem is not the coking problem, but the direct blended yellow dye D-3RNL particles obtained through the mastered conditions have high energy consumption and low yield

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