Production technology improvement for reduction cyanine blue BO(C.I. Vat Blue 20)

A technology of compound and structural formula, which is applied in the field of improving the production process of vat blue BO, can solve the problems of difficult processing, high cost, low product strength, etc., and achieve the effect of smooth and thorough reaction and improved product quality

Active Publication Date: 2009-08-12
JIANGSU HUAER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product produced by this process has low strength and dark color, which is difficult and costly for commercial processing

Method used

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  • Production technology improvement for reduction cyanine blue BO(C.I. Vat Blue 20)
  • Production technology improvement for reduction cyanine blue BO(C.I. Vat Blue 20)

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] 1. Check production equipment, instruments, etc.

[0016] 2. Wash and dry the condensation kettle, and close the bottom valve tightly.

[0017] 3. Add 200L of triethylene glycol from the metering tank, start stirring, put 18kg of anhydrous sodium acetate and 260Kg of potassium hydroxide into a 1000L condensation pot in turn under stirring conditions, and heat to 110-125°C with a vapor pressure of less than 0.3Mpa to liquefy the alkali 1 hour to allow the base to fully dissolve.

[0018] 4. When the temperature is 120-125°C, use 0.01-0.02Mpa nitrogen for protection, slowly and alternately add benzophenone and sodium chlorate in a small amount, and cool down with cooling water to keep the temperature below 140°C. The whole process takes 4-5 Hours. After adding the material, turn off the cooling water and let it heat up to the highest point naturally.

[0019] 5. After the temperature is stable, use 0.45-0.6Mpa steam to raise it to 150-155°C and keep it at this temperat...

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PUM

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Abstract

The present invention relates to the improvement of the production process of preparing reduced blue BO (C.I.Vat Blue 20). The reduction dark blue BO production technology method reported before this is to use triethylene glycol as a flux, adding sodium chlorate to make benzothrone in the hydrogen oxidation process. It can be obtained by dehydrogenation in molten potassium and ring closure. The product produced by this process has low strength and dark color, which is difficult and expensive for commercial processing. If it is used as a dye intermediate, it will have a greater impact on the quality and yield of downstream products. The improvement of the production process of the reduced dark blue BO provided by the present invention is that in the above method, the fluxing agent sodium acetate is added to make the reaction more smooth and thorough, the process is easy to control, and the product quality is obviously improved.

Description

Technical field: [0001] The invention relates to an improved production process for preparing vat blue BO (C.I.Vat Blue 20). Background technique: [0002] Vat dyes are a class of high-grade dyes with many varieties, bright colors and excellent fastness. They are widely used in the printing and dyeing of cotton, wool, silk, linen, synthetic fibers and their blended and interwoven fabrics. Due to their excellent light fastness , weather resistance, heat resistance, solvent resistance, washability. Many of them can be made into organic pigments through special processing, which are used for coloring paint, plastic, rubber and coating. [0003] Vat dyes generally have a complicated production process and serious pollution of the three wastes. Under the current pressure of environmental protection, the improvement of the production process of vat dyes and their intermediates is extremely important in the development of this type of vat dyes. [0004] Vat dark blue BO dye is an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B9/02
Inventor 周多刚陈乐文何黎明
Owner JIANGSU HUAER CHEM
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