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A kind of preparation method of ultrafine anthraquinone

A technology for anthraquinone and quinone finished products, which is applied in the field of preparation of ultra-fine anthraquinone to achieve the effect of small anthraquinone particle size and stable process

Active Publication Date: 2018-08-10
吉林紫瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of ultra-fine anthraquinone, which solves the environmental problems caused by powder flying when reducing the particle size of anthraquinone, and has the effect of reducing powder flying and environmental protection

Method used

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  • A kind of preparation method of ultrafine anthraquinone
  • A kind of preparation method of ultrafine anthraquinone
  • A kind of preparation method of ultrafine anthraquinone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0029] Embodiment 1-3: a kind of anthraquinone finished product, it is prepared by following steps:

[0030] A. Take the anthraquinone raw material, raise the temperature to 40-50°C, add benzene until it just dissolves, heat filter to take the clear liquid, and concentrate the clear liquid to obtain an oil;

[0031] B. Take the oil obtained in step A, place it directly at -20~-10°C for quenching and directly add the water layer of -20~-10°C water / methyl tert-butyl ether saturated solution (including 0.1wt% to 0.5wt% of PAA), stirred, and a large amount of anthraquinone was precipitated, filtered and washed with water at 0 to 5°C to obtain the finished anthraquinone.

[0032] The raw material information of table 1 embodiment 1-3

[0033]

Embodiment 4

[0034] Embodiment 4: A finished product of anthraquinone, the difference from Embodiment 2 is that no PAA is added in Step B.

Embodiment 5

[0035] Example 5: A finished product of anthraquinone, the difference from Example 2 is that the temperature of the water used for washing in step B is 25-30°C

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Abstract

The invention discloses a preparation method of superfine anthraquinone. The preparation method of superfine anthraquinone comprises the following steps: a finished anthraquinone product, an organic solvent and water are mixed, stirred and dispersed, and a suspension is obtained; the suspension is pumped to a spray dryer for spray drying, and a product is obtained, wherein the mass ratio of the organic solvent to the water is 3%-6%:1, and the organic solvent adopts methyl alcohol or methyl tert-butyl ether. The preparation method has the advantages that flying powder is reduced, and environmental protection is realized.

Description

technical field [0001] The invention relates to a preparation method of ultrafine anthraquinone. Background technique [0002] Anthraquinone (Anthraquinone, C 14 h 8 o 2 ), is an important chemical intermediate, widely used in the fields of dyes, medicines and pesticides. With the development of anthraquinone's application field, its demand is also increasing. At present, anthraquinone is relatively tight in the international and domestic markets. The huge market demand for anthraquinone has brought spring to the development of anthraquinone. [0003] The publication number is CN1683305A, and the Chinese patent on October 19, 2005 discloses a method for ring-closing synthesis of anthraquinone from o-benzoylbenzoic acid. The method comprises the following steps: [0004] A, drop o-benzoylbenzoic acid in the closed-loop reactor, heat up and keep warm until the surface moisture of o-benzoylbenzoic acid is evaporated to dryness according to the conventional process; [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C50/18C07C46/10
CPCC07C46/10C07C50/18
Inventor 吴洪兴翟金希孙凤祥徐兴度徐勇匡新杰谭政汤晓华
Owner 吉林紫瑞新材料有限公司
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