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Prepn of rhodamin B

A technology of flask and m-hydroxy, which is applied in the field of dye preparation, can solve the problems of large water resources, high production cost, and long reaction time, and achieve the effects of reducing production cost, improving production efficiency, and shortening production time

Inactive Publication Date: 2006-08-02
柳鸣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method of the prior art not only consumes a large amount of water resources, but also produces a large amount of waste water, and the discharge of waste water causes pollution to the surrounding environment
The existing production process requires a high reaction temperature and a long reaction time, which consumes a lot of energy and results in high production costs.

Method used

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  • Prepn of rhodamin B
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Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) At normal temperature, in the flask, drop into following raw material successively by following parts by weight: 145g o-dichlorobenzene, 48g anhydrous phthalic anhydride, 38g m-hydroxyl N, N-diethylaniline; Flask is set Dehydration separator and condenser, equipped with stirring device and thermometer;

[0023] (2) Start the stirring device, then feed nitrogen into the flask, and heat up to 175°C;

[0024] (3) Drop into the m-hydroxyl N, N-diethylaniline 5 times in the flask again, drop into 5g m-hydroxyl N, N-diethylaniline at every turn, promptly drop into the m-hydroxyl N of 25g altogether, N-diethylaniline Aniline;

[0025] (4) the flask was incubated at a temperature of 175° C. for 3 hours;

[0026] (5) Then the above-mentioned flask is cooled to 100°C, the reaction mixture in the flask is poured into a beaker, and the excess anhydrous phthalic anhydride in the reaction is neutralized with 300ml of 20% NaOH solution, and 400ml of 10% sulfuric acid is used for...

Embodiment 2

[0029] (1) At normal temperature, in the flask, drop into the following raw materials successively by the following parts by weight: 150g p-dichlorobenzene, 60g anhydrous phthalic anhydride, 38g m-hydroxyl N, N-diethylaniline; Dehydration separator and condenser, equipped with stirring device and thermometer;

[0030] (2) Start the stirring device, then feed nitrogen into the flask, and heat up to 175°C;

[0031] (3) Drop into the m-hydroxyl N, N-diethylaniline 5 times in the flask again, drop into 5g m-hydroxyl N, N-diethylaniline at every turn, promptly drop into the m-hydroxyl N of 25g altogether, N-diethylaniline (4) the flask was incubated at a temperature of 170°C for 4 hours; (5) the above-mentioned flask was then cooled to 100°C, the reaction mixture in the flask was poured into a beaker, and the reaction was neutralized with 400ml of 20% NaOH solution Excessive anhydrous phthalic anhydride, utilize 10% sulfuric acid 450ml to extract the material of the reaction mixtu...

Embodiment 3

[0034] (1) At normal temperature, in the flask, drop into the following raw materials successively by the following parts by weight: 130g p-dichlorobenzene, 40g anhydrous phthalic anhydride, 38g m-hydroxyl N, N-diethylaniline; Dehydration separator and condenser, equipped with stirring device and thermometer;

[0035] (2) Start the stirring device, then feed nitrogen into the flask, and heat up to 175°C;

[0036] (3) Drop into the m-hydroxyl N, N-diethylaniline 5 times in the flask again, drop into 5g m-hydroxyl N, N-diethylaniline at every turn, promptly drop into the m-hydroxyl N of 25g altogether, N-diethylaniline Aniline;

[0037] (4) the flask was incubated at a temperature of 170° C. for 4 hours;

[0038] (5) Then the above-mentioned flask is cooled to 100°C, the reaction mixture in the flask is poured into a beaker, and the excessive anhydrous phthalic anhydride in the neutralization reaction is neutralized with 300ml of 20% NaOH solution, and 400ml of 10% sulfuric ac...

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Abstract

The present invention discloses one process of preparing rhodamin B in low power consumption and environment friendly mode. Inside organic solvent of arene halide, m-hydroxy-N, N-diethyl aniline and phthalic anhydride produce condensation reaction to prepare rhodamin B. The process has the organic solvent recovered and reused, no waste water draining, low reaction temperature and short reaction period.

Description

technical field [0001] The invention relates to the field of dye preparation methods, more specifically, relates to a method for preparing dyes using organic solvents. Background technique [0002] Rhodamine B, namely C.I. Basic Violet 10 (dye classification code), its structural formula is: formula (I) [0003] [0004] Rhodamine B is a dye mainly used in the dyeing of cotton, hemp, acrylic, and silk, and can also be used in the coloring of paper, wood, bamboo, and feathers. In cosmetics, it can also be used to make lipstick, nails, etc. oil etc. The production method in the prior art not only consumes a large amount of water resources, but also produces a large amount of waste water, and the discharge of the waste water causes pollution to the surrounding environment. The existing production process requires high reaction temperature and long reaction time, which consumes a large amount of energy and results in high production cost. Contents of the invention [000...

Claims

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Application Information

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IPC IPC(8): C07D311/80
Inventor 柳鸣
Owner 柳鸣
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