A preparation method for preparing the precursor of cationic bright yellow 7gl
A cationic bright yellow and precursor technology, applied in organic chemistry, organic dyes, etc., can solve problems such as environmental pollution, low yield, and great harm to human body, and achieve the effects of optimizing the ratio of raw materials, increasing product yield, and reducing production costs
Active Publication Date: 2017-09-05
平顶山市铭源化工有限公司
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[0020] The invention provides a preparation method for preparing the precursor of Cationic Bright Yellow 7GL, which solves the problems of low yield, great harm to human body, serious environmental pollution and the like in the existing method for preparing the precursor of Cationic Bright Yellow 7GL
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[0043] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0044] A preparation method for preparing a precursor of cationic bright yellow 7GL, comprising the steps of:
[0045] (1) The synthesis of 3-methylbenzothiazole hydrazone comprises the following steps:
[0046] A Methylation: Take 2-aminobenzothiazole, dichloroethane, and catalyst 1, stir and beat, add dimethyl sulfate at 30-35°C, add the total time for 60-100 minutes, and then heat up to 60-70°C ℃ for 1-2 hours to react to the end point, then add water to raise the temperature to recover dic...
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The invention relates to a preparation method of a parent of cationic bright yellow 7GL. The preparation method comprises the following steps: (1) synthesis of 3-methyl benzothiazole hydrazone: A methylation: taking 2-aminobenzothiazole, dichloroethane and a catalyst I, mixing, beating, adding dimethyl sulfate for 60-100min in total at 30-35 DEG C, heating to 60-70 DEG C for reaction for 1-2h to an end point, adding water, heating up to recover dichloroethane to form an aqueous solution containing an intermediate as shown as Formula 1, and B condensation: adding a catalyst II into the solution containing the intermediate as shown as Formula 1, regulating pH (potential of hydrogen) to 2-4, adding hydrazine hydrate for reaction for 4-5h at 98-99 DEG C, after the reaction, cooling and filtering to obtain 3-methyl benzothiazole hydrazone containing the intermediate as shown as Formula 1, (2) synthesis of 2-chloromethylbenzimidazole, and (3) synthesis of the parent: condensing, filtering and drying 3-methyl benzothiazole hydrazone and 2-chloromethylbenzimidazole to form the parent. The preparation method is high in yield, low in cost, environment-friendly and pollution-free.
Description
technical field [0001] The invention relates to a method for preparing a dye, in particular to a method for preparing a precursor of cationic bright yellow 7GL. Background technique [0002] Cationic Bright Yellow 7GL (Basic Yellow 24) belongs to a kind of cationic dyes, which is a kind of textile dyes, also known as basic dyes and salt-based dyes. Soluble in water, it is in cationic state, mainly used for dyeing acrylic fiber. It can also be combined with protein molecules with salt and alkali. Cationic dyes are soluble in water and ionized in aqueous solution to generate dyes with positively charged colored ions. The cation of the dye can combine with the acid group of the third monomer in the fabric to dye the fiber. It is a special dye for acrylic fiber dyeing. It has the advantages of high strength, bright color and good light fastness. A synthetic precursor is needed during the synthesis of Cationic Bright Yellow 7GL. [0003] The synthetic method of described prec...
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IPC IPC(8): C07D417/12C09B69/06
Inventor 刘晨义员海峡刘仁义师阿丽
Owner 平顶山市铭源化工有限公司