Preparation method of 1,4-diamido-2,3-dicyano anthraquinone

Abstract

The invention relates to a preparation method of 1,4-diamido-2,3-dicyano anthraquinone. The preparation method comprises steps as follows: 1,4-diamido-2,3-dichloroanthraquinone is taken as a raw material and is heated to reflux with a high-boiling-point polar solvent as a reaction medium and formamide as a cyanation reagent in the presence of a phase transfer catalyst, a dehydrating agent and an acid-binding agent, a product is cooled, filtered, washed with water and dried, and 1,4-diamido-2,3-dicyano anthraquinone is prepared. The technical scheme has the characteristics of low environmental toxicity, low environmental protection pressure and simplicity in technological operation; the prepared 1,4-diamido-2,3-dicyano anthraquinone reaches the same level of the prior art when used for preparing disperse turquoise blue S-GL.

Description

technical field [0001] The invention relates to a preparation method of a dye intermediate, in particular to a preparation method of 1,4-diamino-2,3-dicyanoanthraquinone, an intermediate of dispersing Cuilan S-GL. Background technique [0002] 1,4-diamino-2,3-dicyanoanthraquinone is an important intermediate of disperse turquoise blue S-GL, dye index number C.I.Blue60, turquoise blue S-GL has a bright color, green light blue, It is used to spell lake blue, lake green, brilliant green and other bright colors, and has its special purpose in the printing and dyeing industry. [0003] The raw materials required for the synthesis of 1,4-diamino-2,3-dicyanoanthraquinone, the intermediate of disperse turquoise blue S-GL, generally start from 1,4-diaminoanthraquinone leuco, the preparation method in the early patent US2628963A Yes: 1,4-diaminoanthraquinone leuco is chlorinated with sulfuryl chloride in an inert solvent (such as o-dichlorobenzene, nitrobenzene, etc.) to obtain 1,4-d...

AI Technical Summary

Problems solved by technology

The above-mentioned method for preparing 1,4-diamino-2,3-dicyanoanthraquinone mainly has three major disadvantages: 1. use concentrated sulfuric acid, sulfonyl chloride, boric acid and other medicaments for easily corroded equipment; And it needs to consume a large amount of alkali, generate a large amount of salt, the waste water is not easy to treat, and directly discharges the environment; 3. The synthetic route is long and the operation is complicated, so it is difficult to control the quality of key intermediates, and the overall yield is also unsatisfactory

The main reason why cyanide is scary is its high toxicity; another important reason is that cyanide is an important chemical raw material, and its production is not too difficult. too difficult thing

Because chemicals have more or less loopholes in many links such as production, sales, transportation, and use. With the occurrence of the Tianjin Port explosion accident, the production and control of highly toxic substances such as sodium cyanide will become more stringent. Stress and trouble for both cyanide producers and users