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A kind of production method of ultraviolet absorber bp-3

A BP-3, production method technology, applied in the direction of chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve the problems of large environmental pollution, low product yield, high production cost, etc., to reduce production cost , The reaction process is stable and the temperature is controllable

Active Publication Date: 2022-03-25
HUBEI MEIKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the present invention proposes a production method of ultraviolet absorber BP-3, which solves the problems of low product yield, large environmental pollution and high production cost in the existing BP-3 production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A production method of ultraviolet absorber BP-3, specifically comprising the following steps:

[0022] S1: condensation reaction: drop into 800kg of ethylene dichloride, 100kg of resorcinol in the reactor, stir to be warming up to 45 ℃, then add 160kg of benzyl trichloride, 9 hours of insulation reaction at 55 ℃, also communicated with on the reactor The tail gas absorption device absorbs the HCL generated during the condensation reaction to obtain a high-concentration hydrochloric acid by-product;

[0023] S2: hydrolysis stratification and transfer material: add deionized water to the reaction product of S1, hydrolyze reaction at 80 ° C for 2 hours, keep at 80 ° C for 30 minutes and leave for stratification, the upper water layer is applied mechanically, and the lower layer material is transferred to another reaction kettle solvent with water;

[0024] S3: esterification reaction: in S2, add sodium carbonate 150kg in the reactor containing the lower layer material, t...

Embodiment 2

[0027] A production method of ultraviolet absorber BP-3, specifically comprising the following steps:

[0028] S1: condensation reaction: drop into 900kg of ethylene dichloride, 100kg of resorcinol in the reactor, be warming up to 47 ℃ with stirring, add 185kg of benzyl trichloride again, heat preservation reaction 9 hours at 55 ℃, also communicate with on the reactor The tail gas absorption device absorbs the HCL generated during the condensation reaction to obtain a high-concentration hydrochloric acid by-product;

[0029] S2: hydrolysis stratification and transfer material: add deionized water to the reaction product of S1, hydrolyze reaction at 80 ° C for 2 hours, keep at 80 ° C for 30 minutes and leave for stratification, the upper water layer is applied mechanically, and the lower layer material is transferred to another reaction kettle solvent with water;

[0030] S3: esterification reaction: in S2, add sodium carbonate 170kg in the reactor containing the lower layer m...

Embodiment 3

[0033] A production method of ultraviolet absorber BP-3, specifically comprising the following steps:

[0034] S1: condensation reaction: drop into 1000kg of ethylene dichloride, 100kg of resorcinol in the reactor, stir to be warming up to 50 ℃, then add 200kg of trichlorobenzyl, under 55 ℃ of insulation reaction 9 hours, also communicate with on the reactor The tail gas absorption device absorbs the HCL generated during the condensation reaction to obtain a high-concentration hydrochloric acid by-product;

[0035] S2: hydrolysis stratification and transfer material: add deionized water to the reaction product of S1, hydrolyze reaction at 80 ° C for 2 hours, keep at 80 ° C for 30 minutes and leave for stratification, the upper water layer is applied mechanically, and the lower layer material is transferred to another reaction kettle solvent with water;

[0036] S3: esterification reaction: in S2, add sodium carbonate 200kg in the reactor containing the lower layer material, t...

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Abstract

The present invention relates to a production method of ultraviolet absorber BP-3, which specifically comprises the following steps: S1: Condensation reaction: put solvent and resorcinol into the reaction kettle, stir and heat up, then add trichlorobenzyl, keep warm and carry out condensation Reaction; S2: hydrolysis stratification and material transfer: add deionized water to the reaction product of S1, hydrolysis reaction, stand and stratify, the upper water layer is applied mechanically, and the lower layer material is transferred to another reaction kettle with solvent and water; S3: esterification Reaction: Add sodium carbonate and dimethyl sulfate to the reaction kettle containing the lower layer materials in S2, and keep warm for reaction; S4: Prepare finished product: centrifugally filter the product after the esterification reaction, and pack the filtered sodium sulfate by-product, The filtrate is evaporated to recover the solvent, and the solvent is used mechanically. The material after the solvent is evaporated is sequentially rectified, refined, centrifuged, and dried to obtain the finished product. The production process adopted in this application makes the production of BP-3 more concise, smooth, and safer, reduces the production cost by more than 40%, and brings considerable profits to the enterprise. At the same time, the production process is cleaner, more efficient, and more friendly to the environment.

Description

technical field [0001] The invention relates to the technical field of ultraviolet absorber synthesis, in particular to a production method of an ultraviolet absorber BP-3. Background technique [0002] UV absorber BP-3 has the advantages of high absorption rate, non-toxic, non-teratogenic effect, good stability to light and heat, etc. It can absorb UV-A and UV-B at the same time, and is a class I sunscreen approved by the US FDA It is widely used in sunscreen cosmetics such as sunscreen cream, cream, honey, lotion, oil, etc., and can also be used as an anti-discoloration agent for products that are discolored by photosensitivity. Compatibility and protection for PVC and unsaturated polyester. [0003] At present, there are only a limited number of domestic manufacturers, such as Nanjing Ziqi and Huayang, with an annual domestic output of about 300 tons, while the annual demand in the Asian market alone is about 800 tons. Market demand for BP-3. There is an urgent need to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/61C07C49/84
CPCC07C37/18C07C45/43C07C45/61C07C39/15C07C49/83C07C49/84
Inventor 方辉明
Owner HUBEI MEIKAI CHEM
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