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Preparation method of 2,4-dyhydroxyl benzophenone

A technology of dihydroxybenzophenone and resorcinol, which is applied in two fields, can solve the problems of high process waste water, high production cost, and low product yield, and achieve simple process, high product yield and purity, and use less effect

Active Publication Date: 2010-09-15
HUBEI MEIKAI CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation method of 2,4-dihydroxybenzophenone usually selects methanol as a catalyst, and is prepared by reacting resorcinol, trichlorotoluene and methanol. The method consumes a lot, and the production cost is high. Low, produces more process wastewater, which is not conducive to environmental protection

Method used

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  • Preparation method of 2,4-dyhydroxyl benzophenone
  • Preparation method of 2,4-dyhydroxyl benzophenone
  • Preparation method of 2,4-dyhydroxyl benzophenone

Examples

Experimental program
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Embodiment 1

[0015] Put 250kg of water, 100kg of resorcinol and 5kg of catalyst methyl acetate in the reaction kettle, heat and slowly raise the temperature until the temperature in the kettle reaches 38°C, then add 190kg of trichlorotoluene dropwise under stirring at a stirring speed of 82r / min, dropwise The addition time was 2.5 hours. After the dropwise addition was completed, the reaction was kept at 42° C. for 2.5 hours. After the reaction is completed, wash with water at 60-70°C until the pH value is 6.0-7.0, centrifuge and dry to obtain a yellow powder.

[0016] The final product of this embodiment is characterized by infrared spectroscopy (see figure 1 ), and with the infrared spectrum of 2,4-dihydroxybenzophenone standard substance (see figure 2 ) is compared, and the result confirms that this product is 2,4-dihydroxybenzophenone. Through liquid chromatography analysis, the product yield is 98.51%, and the purity is 98.57%. Finally, the product is crushed and packed into stora...

Embodiment 2～3

[0017] Keep the feed intake of 250kg water, 100kg resorcinol and 190kg trichlorotoluene constant, change the feed intake of methyl acetate, other operating conditions and product characterization methods are all the same as in Example 1, to obtain 2,4-dihydroxy di Benzophenone. The dosage and test results of methyl acetate are shown in Table 1.

[0018] Table 1. The charging capacity and the result of embodiment 2~3 methyl acetate

[0019]

Embodiment 4～5

[0021] Keep the feed intake of 100kg resorcinol, catalyst methyl acetate 5kg and 190kg trichlorotoluene constant, change the feed intake of water, other operating conditions and product characterization methods are all the same as in Example 1, obtain 2,4-dihydroxy Benzophenone. The dosage and test results of methyl acetate are shown in Table 2.

[0022] Table 2. The feeding amount and the result of embodiment 4~5 water

[0023]

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Abstract

The invention relates to a preparation method of 2,4-dyhydroxyl benzophenone, which comprises the steps of: adding resorcinol, water and a catalyst in a reaction container, wherein the catalyst is an ester compound; dripping benzotrichloride under the stirring condition at the temperature of 38-45 DEG C according to a certain proportion at a certain dropping speed, and fully reacting by preserving the temperature at 42-45 DEG C; washing a reactant until the pH value is 6.0-7.0; and centrifuging and drying to obtain the 2,4-dyhydroxyl benzophenone. The method has simple process, safe and convenient operation, less environment pollution, low cost and high product yield and purity.

Description

technical field [0001] The invention relates to a preparation method of a light stabilizer, in particular to a preparation method of 2,4-dihydroxybenzophenone. Background technique [0002] 2,4-dihydroxybenzophenone, commonly known as BP-1, benzophenone-1, is mainly used as a light stabilizer in plastics, etc., which can effectively protect organic glass and cloth, prevent materials from deteriorating due to light, and is also used as Synthetic intermediates of other UV absorbers. [0003] At present, the preparation method of 2,4-dihydroxybenzophenone usually selects methanol as a catalyst, and is prepared by reacting resorcinol, trichlorotoluene and methanol. The method consumes a lot, and the production cost is high. It is relatively low and produces more process wastewater, which is not conducive to environmental protection. Contents of the invention [0004] The purpose of the present invention is to make up for the deficiencies of the above-mentioned prior art, and...

Claims

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Application Information

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IPC IPC(8): C07C49/83C07C45/43
Inventor 李小林胡林松张兴江
Owner HUBEI MEIKAI CHEM
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