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Ultraviolet ray absorber UV-531 synthesis process

A kind of UV-531 and synthetic process technology, which is applied in the preparation of carbon-based compounds, organic compounds, organic chemistry, etc., can solve the problems of unsuitability for large-scale production, low production efficiency, complicated production process, etc., and improve the single-pass conversion The efficiency and the yield of the product, the improvement of work efficiency, and the effect of overcoming many processes

Inactive Publication Date: 2016-06-08
赵建英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current synthesis process of ultraviolet absorber UV-531, the process flow is not easy to implement, the finished product of ultraviolet absorber UV-531 has low purity, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and the cost is high , not suitable for mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] The synthetic technique of the ultraviolet absorber UV-531 of the present embodiment, comprises the following steps:

[0013] (1) Add 2,4-dihydroxybenzophenone, dioctyl carbonate and solvent into the four-necked flask to mix;

[0014] (2) Start the agitator and heat up to 150°C, then reflux the water separator to divide the water until no water drops are formed in the water separator, and continue to reflux for 1 hour;

[0015] (3) After the reflux, cool the four-necked flask to 50°C, add water to wash twice, and distill out the solvent from the organic phase under reduced pressure;

[0016] (4) Stir with alcohol, cool and recrystallize, and then filter and centrifugally wash to obtain white crystalline powder 2-hydroxy-4-n-octyloxybenzophenone.

[0017] The synthesis process of ultraviolet absorber UV-531 does not require cumbersome post-reaction treatment, greatly improves product performance, and is environmentally friendly and pollution-free. The process is easy to...

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PUM

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Abstract

The present invention discloses an ultraviolet ray absorber UV-531 synthesis process, which comprises: 1, adding 2,4-dihydroxy benzophenone, dioctyl carbonate and a solvent into a four-necked flask, and mixing; 2, opening a stirrer, heating to a temperature of 150 DEG C, carrying out reflux water separation through a water separation device until no water bead is generated in the water separation device, and continuously carrying out reflux for 1 h; 3, after completing the reflux, cooling the four-necked flask to a temperature of 40-60 DEG C, adding water, washing twice, and carrying out pressure reducing distillation on the organic phase to distill out the solvent; and 4, adding alcohol, stirring, cooling, re-crystallizing, and carrying out filtering centrifugal washing to obtain the white crystal powder 2-hydroxy-4-n-octyloxy benzophenone. According to the present invention, in the reaction, the dioctyl carbonate is used to replace 1-chlorooctane (1-bromooctane), such that the process synthesis steps are reduced, the raw material cost and the equipment cost are reduced, and the generation of harmful gases such as SO2 and HCl or HBr during the synthesis of 1-chlorooctane (1-bromooctane) is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of an ultraviolet absorber UV-531. Background technique [0002] The synthesis process of the ultraviolet absorber UV-531 at least includes washing, stirring, filtering, centrifuging and other processes. In the current synthesis process of ultraviolet absorber UV-531, the process flow is not easy to implement, the finished product of ultraviolet absorber UV-531 has low purity, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and the cost is high , not suitable for mass production. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the purpose of the present invention is to provide a synthesis process of ultraviolet absorber UV-531. The present invention not only has simple production process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/84C07C45/64
Inventor 赵建英
Owner 赵建英