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Method using oxidization wastewater generated during DSC acid production to prepare direct yellow dye

A technology for oxidizing wastewater and yellow dyes

Inactive Publication Date: 2018-11-02
ZHEJIANG HONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These wastewaters need complex chemical and biological treatment to meet discharge standards, and the treatment costs are high, which significantly increases the cost of DSD acid production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, a kind of method that utilizes the oxidized waste water that produces DSD acid to produce direct yellow dyestuff, comprises the following steps: (1) after the oxidized waste water gained in the production process of DSD acid is concentrated, cooled, and filtered to remove sodium sulfate and DNS After obtaining the concentrated solution, measure the amino content in the concentrated solution; (2) adjust the pH of the concentrated solution in step (1) to 2 to 3, add tri-n-octylamine solution, and the volume ratio of tri-n-octylamine solution to the concentrated solution is 1 / 3-1 / 2, after stirring for 20-40 minutes, stratification occurs after standing still, the upper layer is the oil phase, and the lower layer is the water phase, take the upper oil phase and wash the oil phase with water until the washing water after washing is colorless or Light color is enough; (3) Add water to the oil phase obtained in step (2), the volume ratio of water to the oil phase ...

Embodiment 2

[0019] Embodiment 2, in the method for preparing direct yellow dyestuff by using the oxidized waste water that produces DSD acid described in embodiment 1: the tri-n-octylamine solution in the described step (2) is the tri-n-octylamine solution of concentration 20-30% , the tri-n-octylamine solution is one or two mixtures of sulfonated kerosene and high-flash point white oil as a solvent. More preferably, it is a 25% tri-n-octylamine solution.

Embodiment 3

[0020] Example 3, in the method for preparing direct yellow dyestuffs from the oxidized waste water produced by producing DSD acid described in Example 1 or 2: the volume ratio of the tri-n-octylamine solution to the concentrated solution in the step (2) is 1 / 3 , stirring time is 30 minutes.

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PUM

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Abstract

The invention relates to a method using oxidization wastewater generated during DSC acid production to prepare direct yellow dye. The method includes the steps of firstly, filtering the oxidization wastewater generated during DSC acid production to remove sodium sulfate and DNS to obtain concentration, and measuring amino content; secondly, adding a tri-n-octylamine solution into the concentrate obtained in the first step, taking upper-layer oil, and washing the upper-layer oil with water; thirdly, adding water and alkali into the oil phase obtained in the second step; fourthly, regulating thesolution obtained in the third step with acid, and taking oil phase; fifthly, adding water into the oil phase obtained in the fourth step, and adding ethanolamine by using the amino content measuredin the first step as the reference; sixthly, subjecting the mixture obtained in the fifth step to standing and layering, wherein the lower-layer water phase is the direct yellow dye. The method has the advantages that a wastewater treatment process can be simplified, wastewater treatment cost can be lowered, and organic components such as various aromatic compounds containing nitro, water-solublesulfonic groups and carboxylic acid groups in the oxidation wastewater are sufficiently utilized to prepare the direct yellow dye.

Description

technical field [0001] The invention relates to the technical field of fine chemical industry, in particular to a method for preparing direct yellow dye by using oxidized waste water produced in the production of DSD acid. Background technique [0002] DSD acid is also known as 4,4'-diaminostilbene-2,2'-disulfonic acid, which has multiple chemical names, such as DSD acid; diaminostilbene disulfonic acid; 4,4'-diamino- 2,2'-disulfonic acid-stilbene, it is an important raw material for the manufacture of dyes, fluorescent whitening agents and moth-proofing agents, especially in the production of stilbene-based fluorescent whitening agents. [0003] At present, the synthesis of DSD acid generally consists of three major processes: sulfonation, oxidative condensation, and reduction. During the oxidative condensation process of DSD acid production, a large amount of aromatic compound wastewater containing nitro and water-soluble sulfonic acid groups is produced, including raw ma...

Claims

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Application Information

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IPC IPC(8): C09B35/215C09B56/00
CPCC09B35/215C09B56/005
Inventor 李将陈鑫孙才陈燕
Owner ZHEJIANG HONGDA CHEM
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