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A technology of disperse red and products, applied in chemical instruments and methods, preparation of azo dyes, azo dyes, etc., can solve the problems of difficult wastewater treatment, large amount of wastewater, low yield, etc., and reduce energy consumption and dust Pollution, the effect of eliminating heavy metal ion pollution
Active Publication Date: 2014-03-12
JIANGSU D I A N CHEM CO LTD
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Problems solved by technology
Because a large amount of copper salt or zinc salt is used, it is difficult to remove copper or zinc after the filter cake is synthesized; and the intermediate needs to be dried and reacted in DMF solution, so the yield is low and the amount of waste water is large , the waste water is extremely difficult to treat
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Embodiment 1
[0014] Example 1: In a 250mL flask, add 10.6g of Intermediate A, 53g of toluene, 21.2g of water, 0.21g of dodecyltrimethylammonium bromide, 0.02g of copper salt catalyst, 3.42g of cyanohydrin, A few grams of acidic acid agent, at 100°C, TLC detects that the reaction is complete, filters, washes to remove salt, and washes again to obtain 8.22g of the product, with a yield of 98%.
Embodiment 2
[0015] Example 2: In a 250mL flask, add 11.6g of Intermediate A, 58g of toluene, 23.2g of water, 0.23g of dodecyltrimethylammonium bromide, 0.02g of copper salt catalyst, 3.42g of cyanohydrin, A few grams of acid agent, at 100 ° C, TLC detection of the end of the reaction, filtered, washed to remove salt, and then washed to obtain 8.82 g of the product, with a yield of 96%.
Embodiment 3
[0016] Example 3: In a 250mL flask, add 10.6g of Intermediate B, 45g of toluene, 18.2g of water, 0.1g of dodecyltrimethylammonium bromide, 0.01g of copper salt catalyst, 2.42g of cyanohydrin, Some g of acid-forwarding agent, at 110°C, TLC detected that the reaction was completed, filtered, washed to remove salt, and washed again to obtain 7.89g of the product, with a yield of 94%.
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Abstract
The invention provides a method for producing disperse red 343. The method specifically comprises the following step of cyaniding intermediates A and B by using cyano alcohol in a two-phase system under catalysis of a phase transfer catalyst. According to the method, the step of cyaniding the dried intermediates A and B by cuprous cyanide and zinc cyanide reagents in a DMF (Dimethyl Formamide) solvent in the conventional process is replaced, so that pollution caused by heavy metal ions in a dye is avoided. The cyaniding process is carried out by two phases, and operation of drying the intermediates A and B is omitted, so that the energy consumption and dust pollution are reduced. The method is a brand new pollution-free and environment-friendly synthetic process.
Description
technical field [0001] The invention relates to a method for preparing disperse dyes, in particular to a method for producing disperse red 343 filter cake. Background technique [0002] Disperse Red 343 is a disperse dye with bright shade and excellent fastness, suitable for dyeing polyester fiber. Because the dye has two cyanide groups, it has bright shade, high color yield and high affinity to fiber, so it is suitable for superfine fiber dyeing. Disperse Red 60, which is widely used in the market, has the disadvantages of poor color fastness, shallow dyeing depth, and large amount of wastewater in the synthesis process. Disperse Red 343 instead of Disperse Red 60 is the current consensus in the dye industry. As a red disperse dye with increasing demand, it is of great significance to explore its green and environmentally friendly synthesis process. [0003] The traditional production process of Disperse Red 343 filter cake is to dry intermediate A and intermediate B, add...
Claims
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