Benzodifuranone dye synthetic method

Abstract

The invention relates to a benzodifuranone dye synthetic method which comprises the following steps of by taking alkyl ester oxalyl monochloride and aromatic hydrocarbon as raw materials, performing Friedel-Crafts reaction to prepare an intermediate 1 or 1', performing hydrogenation reduction on the intermediate 1 and the intermediate 1' to prepare an intermediate 2 and an intermediate 2', performing condensation reaction on the intermediate 2, an intermediate 3 as a condensation product of p-chlorophenol and then the intermediate 2' to produce an intermediate 4, and performing oxidation on the intermediate 4 to obtain benzodifuranone. The synthetic technology provided by the invention is low in cost, dangerousness and pollution, is simple in technology route without single purification process, is cheap and available in production raw material, has the cost far lower than the cost of the existing technology, is relatively high in the total yield, reaching 69 percent of a product, hasthe content being larger than 98.5 percent, has very high economic benefit, is suitable for mass production and has a good industrial application prospect.

Description

technical field [0001] The invention relates to a synthesis method of benzodifuranone dyes, which belongs to the field of chemical industry. Background technique [0002] Disperse Red 356 and Disperse Red SBWF are the main varieties of benzodifuranone disperse dyes. Because these dyes have high color brightness and luminous intensity, and have excellent dyeing performance, they are widely used in On polyester microfiber. [0003] The production technology of benzodifuranone disperse dyes in the prior art is as follows: [0004] [0005] In this process, the mandelic acid-like structure intermediate (2, 2′) is usually synthesized using highly toxic sodium cyanide, and the starting material is aromatic formaldehyde or aromatic ethyl ketone with a higher price, and the yield is between 60% and 70%. Yield is on the low side; And intermediate 3 uses relatively high hydroquinone as raw material; Ammonium thiocyanate or sodium thiocyanate of stoichiometric equivalent is used i...

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Problems solved by technology

[0005] In this process, the mandelic acid-like structure intermediate (2, 2′) is usually synthesized using highly toxic sodium cyanide, and the starting material is aromatic formaldehyde or aromatic ethyl ketone with a higher price, and the yield is between 60% and 70%. Yield is on the low side; And intermediate 3 uses relatively high hydroquinone as raw material; Ammonium thiocyanate or sodium thiocyanate of stoichiometric equivalent is used in the final oxidation process, because the above-mentioned raw material price is higher, yield The production cost of benzodifuranone disperse dyes is relatively low, and the highly toxic sodium cyanide is unavoidably used in the process, which makes the production process more dangerous and the three wastes are difficult to handle; while the equivalent level of thiocyanate is oxidized , resulting in high salinity wastewater that is difficult to treat

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