Method for preparing sulphur black dye and sodium thiosulfate from sulphur dye waste water

A technology of sodium thiosulfate and sulfur dyes, applied in sulfur dyes, chemical instruments and methods, thiosulfate/dithionite/polythionite, etc., can solve problems such as environmental pollution and reduce emissions volume, and the effect of saving processing fees

Inactive Publication Date: 2010-01-27
蔡瑞琳 +1
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the production wastewater treatment fails to meet the allowable discharge standards stipulated by the state, it will be discharged, which will cause great pollution to the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Add 250KG of sulfur dye wastewater into Reactor 1, heat it to 60°C, add 100KG of 2,4-dinitrochlorobenzene under stirring, and add 30% sodium hydroxide solution to adjust the pH during the mixing process After the value reaches 8, carry out hydrolysis reaction, the reaction times is 1.5 hours, obtains hydrolysis reaction mixed solution;

[0020] 2. Put 250KG of sulfur dye wastewater into the reaction kettle 2, add 100KG of sodium sulfide and sulfur respectively under stirring, heat to 70°C, and carry out polysulfidation reaction. The reaction time is 4 hours, and the polysulfide reaction mixture is obtained. ;

[0021] 3. Add the polysulfidation reaction mixture in reactor 2 to reactor 1 and mix it with the hydrolysis reaction mixture, and carry out the vulcanization reaction under stirring. The reaction temperature is 110°C, the pressure is 0.15 MPa, and the reaction time is 12 hours. After the end, feed air into the reaction kettle 1 to carry out the oxidation reac...

Embodiment 2

[0025] 1. Add 300KG of sulfur dye wastewater into the reactor 1, heat it to 80°C, add 100KG of 2,4-dinitrochlorobenzene under stirring, and add 30% sodium hydroxide solution to adjust the pH during the mixing process After the value reaches 9, carry out hydrolysis reaction, the reaction times is 2 hours, obtains hydrolysis reaction mixture;

[0026] 2. Put 350KG of sulfur dye wastewater into the reaction kettle 2, add 150KG of sodium sulfide and sulfur respectively under stirring, heat to 90°C, and carry out polysulfidation reaction. The reaction time is 5 hours, and the polysulfide reaction mixture is obtained. ;

[0027] 3. Add the polysulfidation reaction mixture in reactor 2 to reactor 1 and mix it with the hydrolysis reaction mixture, and carry out the vulcanization reaction under stirring. The reaction temperature is 120°C, the pressure is 0.2 MPa, and the reaction time is 10 hours. After the end, feed air into the reaction kettle 1 to carry out the oxidation reaction, ...

Embodiment 3

[0031] 1. Add 400KG of sulfur dye wastewater into Reactor 1, heat it to 100°C, add 200KG of 2,4-dinitrochlorobenzene under stirring, and add 30% potassium hydroxide solution to adjust the pH during the mixing process After the value reaches 9.5, carry out hydrolysis reaction, the reaction times is 3 hours, obtains hydrolysis reaction mixture;

[0032] 2. Put 400KG of sulfur dye wastewater into the reaction kettle 2, add 200KG of sodium sulfide and sulfur respectively under stirring, heat to 100°C, and carry out polysulfidation reaction. The reaction time is 6 hours to obtain a polysulfide reaction mixture ;

[0033] 3. Add the polysulfidation reaction mixture in the reaction kettle 2 to the reaction kettle 1 and mix it with the hydrolysis reaction mixture, and carry out the vulcanization reaction under stirring. The reaction temperature is 130 ° C, the pressure is 0.25 MPa, and the reaction time is 8 hours. After the end, air was introduced into the reaction kettle 1 to carry...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for preparing sulphur black dye and sodium thiosulfate from sulphur dye waste water, which comprises the following steps: heating sulphur dye waste water, then mixing the sulphur dye waste water with 2,4-dinitrochlorobenzol, adjusting the PH value of the mixed solution with alkali, and carrying hydrolysis reaction; mixing and stirring the sulphur dye waste water, the sodium thiosulfate and sulfur, and heating the mixture for carrying out polysulfide reaction; mixing the mixed solution of the hydrolysis reaction and the mixed solution of polysulfide reaction for sulfofication reaction, and after the reaction is finished, introducing air for oxidation reaction to obtain mixed mother solution; filtering the mixed mother solution to obtain sulphur black dye grains, and drying, grinding and blending the sulphur black dye grains to obtain commercial sulphur black dye grains; and condensing, decoloring, crystallizing, drying and screening the filtered mixed mother solution to obtain the sodium thiosulfate. The method can effectively treat sulphur dye waste water, not only solve the problem of sewage treatment, but also save large amount of clean water.

Description

technical field [0001] The invention relates to a method for treating and comprehensively utilizing waste water from the production of chemical dyes, in particular to a method for preparing sulfur black dye and sodium thiosulfate by utilizing sulfur dye waste water. Background technique [0002] At present, for the treatment of wastewater generated from the production of sulfur dyes (the wastewater mainly contains derivatives such as dye intermediates and 2,4-dinitrophenol sodium), basically a primary wastewater treatment system is used for neutralization, mixing Coagulation and sedimentation treatment, and then discharge the treated wastewater. If the dye intermediates remaining in the wastewater can be removed after the treatment reaches the standard, the COD at the outlet is below 100mg / l, which meets the national wastewater discharge requirements, but the wastewater treatment fee per ton is more than 50 yuan, which increases the production cost of sulfur dyes . If the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64C09B49/00C02F9/04
Inventor 蔡瑞琳邱勇
Owner 蔡瑞琳
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap