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Method for synthesizing solvent blue 78

A synthesis method and solvent technology, applied in the field of chemical dye manufacturing, can solve the problems of large amount of waste water, high energy consumption, low product yield, etc.

Inactive Publication Date: 2018-08-24
JIANGSU DAOBO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many disadvantages in this process, the product yield is low, only about 70%, the amount of waste water produced is large, the water content is high, and the energy consumption required for drying is relatively large.

Method used

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  • Method for synthesizing solvent blue 78
  • Method for synthesizing solvent blue 78

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 100g of methanol, 100g of water, 40g of 1,4-dihydroxyanthraquinone and 6.7g of 1,4-dihydroxyanthraquinone leuco into the reactor, start stirring, and add 2g of Pingpingo and O after 10min 32.8g of monomethylamine hydrochloride, closed the reactor, started to heat up, and started to keep warm at 85°C. After 26h, the reaction was completed and dropped below 40°C, filtered with suction, washed with hot water, and dried to obtain 47.1g of solvent blue 78, yield 91.2%.

Embodiment 2

[0023] Put 100g of methanol, 100g of water, 40g of 1,4-dihydroxyanthraquinone and 6.7g of 1,4-dihydroxyanthraquinone leuco into the reactor, start stirring, and add 2g of Pingpingo and O after 10min 32.8g of monomethylamine hydrochloride, closed the reactor, started to heat up, and started to keep warm at 105°C. After 16h, the reaction was completed, and the temperature dropped below 40°C. Suction filtration, hot water washing, and drying gave 47.6g of solvent blue 78, yield 92%.

Embodiment 3

[0025] Put 180g of methanol, 20g of water, 40g of 1,4-dihydroxyanthraquinone and 6.7g of 1,4-dihydroxyanthraquinone leuco into the reactor, start stirring, and add 2g of Pingjiao and O after 10min 32.8g of monomethylamine hydrochloride, closed the reactor, started to heat up, and started to keep warm at 105°C. After 12 hours, the reaction was completed, and the temperature dropped below 40°C. Suction filtration, hot water washing, drying, obtained 46.7g of solvent blue 78, yield 90.2%.

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Abstract

The invention discloses a method for synthesizing solvent blue 78. The method comprises the following steps of by taking a methanol aqueous solution as a reaction solvent, fatty alcohol-polyoxyethylene ether as a dispersant, 1,4-dioxyanthraquinone and methylamine hydrochloride as main raw materials and 1,4-dioxyanthraquinone leuco body as an initiator or a catalyst, performing closed reactor condensation reaction to obtain the solvent blue 78 as a target product. As for the method provided by the invention, by replacing volatile liquid monomethylamine with the methylamine hydrochloride, high-concentration nitrogen-containing wastewater is not produced; aryl amination of the 1,4-dioxyanthraquinone adopts a peregal O as the dispersant and the 1,4-dioxyanthraquinone leuco body as the catalyst, the yield of a product is increased from the traditional about 70 percent to 91 percent or above.

Description

technical field [0001] The invention relates to a method for synthesizing solvent dyes, in particular to a method for synthesizing solvent blue 78, and belongs to the technical field of manufacturing chemical dyes. Background technique [0002] Solvent blue 78, also known as transparent blue GP, chemical name, 1,4-di(methylamino)anthraquinone, has the same chemical structure as disperse blue 14, and is mainly used for the coloring of various thermoplastics, resins and polyester raw pulp. Also used to make fireworks. [0003] The main synthetic route of solvent blue 78 is: 1,4-dihydroxyanthraquinone and monomethylamine are used as the main raw materials, and the two are condensed under the catalysis of zinc powder. At present, this method is adopted by most enterprises at home and abroad. However, there are many disadvantages in this process, the product yield is low, only about 70%, the amount of waste water produced is large, the water content is high, and the energy cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C225/34C07C221/00
CPCC07C221/00C07C2603/24C07C225/34
Inventor 徐松刘学峰汪港郭维成
Owner JIANGSU DAOBO CHEM
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