Production method of ultraviolet light absorber BP-3

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

Active Publication Date: 2020-06-19
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 absorbent BP-3, specifically comprising the following steps:

[0022] S1: Condensation reaction: Put 800kg of dichloroethane and 100kg of resorcinol into the reaction kettle, stir and raise the temperature to 45°C, then add 160kg of trichlorobenzyl, keep it warm at 55°C for 9 hours, and there is still a connection on the reaction kettle Tail gas absorption device absorbs HCL generated during the condensation reaction to obtain high-concentration hydrochloric acid by-products;

[0023] S2: Hydrolysis stratification and material transfer: Add deionized water to the reaction product of S1, hydrolyze at 80°C for 2 hours, keep the temperature at 80°C for 30 minutes and stratify, the upper layer of water layer is applied, and the lower layer of material is transferred to another reaction The kettle solvent carries water;

[0024] S3: Esterification reaction: Add 150 kg of sodium carbonate to the reaction kettle containing the lower material...

Embodiment 2

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

[0028] S1: Condensation reaction: Put 900kg of dichloroethane and 100kg of resorcinol into the reaction kettle, stir and raise the temperature to 47°C, then add 185kg of trichlorobenzyl, and keep it warm for 9 hours at 55°C. Tail gas absorption device absorbs HCL generated during the condensation reaction to obtain high-concentration hydrochloric acid by-products;

[0029] S2: Hydrolysis stratification and material transfer: Add deionized water to the reaction product of S1, hydrolyze at 80°C for 2 hours, keep the temperature at 80°C for 30 minutes and stratify, the upper layer of water layer is applied, and the lower layer of material is transferred to another reaction The kettle solvent carries water;

[0030] S3: Esterification reaction: Add 170 kg of sodium carbonate to the reaction kettle containing the lower material in S2, then dropwise add 260 kg of dimethyl sulfat...

Embodiment 3

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

[0034] S1: Condensation reaction: Put 1000kg of dichloroethane and 100kg of resorcinol into the reaction kettle, stir and heat up to 50°C, then add 200kg of trichlorobenzyl, keep the temperature at 55°C for 9 hours, and there is still a connection on the reaction kettle Tail gas absorption device absorbs HCL generated during the condensation reaction to obtain high-concentration hydrochloric acid by-products;

[0035] S2: Hydrolysis stratification and material transfer: Add deionized water to the reaction product of S1, hydrolyze at 80°C for 2 hours, keep the temperature at 80°C for 30 minutes and stratify, the upper layer of water layer is applied, and the lower layer of material is transferred to another reaction The kettle solvent carries water;

[0036] S3: Esterification reaction: Add 200 kg of sodium carbonate to the reaction kettle containing the lower material in S...

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Abstract

The invention relates to a production method of an ultraviolet light absorber BP-3, which specifically comprises the following steps: S1, condensation reaction: adding a solvent and resorcinol into areaction kettle, stirring, heating, adding benzyl trichloride, keeping the temperature, and carrying out condensation reaction, S2, hydrolysis layering and material transferring: adding deionized water into a reaction product obtained in the step S1, carrying out hydrolysis reaction, standing for layering, applying an upper water layer, and transferring a lower-layer material into another reactionkettle with water as a solvent, S3, esterification reaction: adding sodium carbonate and dimethyl sulfate into the reaction kettle containing the lower-layer material in S2, and carrying out heat preservation reaction, and S4, finished product preparation: centrifugally filtering a product after esterification reaction, packaging a filtered sodium sulfate byproduct, evaporating filtrate to recover the solvent, applying the solvent, and sequentially rectifying, refining, centrifuging and drying the material from which the solvent is evaporated to obtain the finished product. According to the production process adopted by the invention, the production of the BP-3 becomes simpler, smoother and safer, the production cost is reduced by 40% or above, considerable profits are brought to enterprises, and meanwhile, the production process is cleaner, more efficient and more environment-friendly.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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