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2,4-dihydroxyldiphenylketone preparation method

A technology of dihydroxybenzophenone and production method, applied in the field of benzophenone ultraviolet absorber-2, can solve the problems of low purity, low product yield and the like

Inactive Publication Date: 2010-01-20
宜都市华阳化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Above-mentioned production method product yield is low, purity is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Raw material preparation:

[0017] Resorcinol 100kg

[0018] Trichlorotoluene 500 kg

[0019] Ethanol 100 kg

[0020] Methanol 50 kg

[0021] 500 kg of water

[0022] First add water to the reaction kettle, turn on the steam to raise the water temperature to 35-38°C, then put resorcinol into the reaction kettle, start stirring for 5-8 minutes to completely dissolve the resorcinol, then add methanol and ethanol Put it in the reactor. Control the amount of steam and slowly heat the material to 50-60°C, then add trichlorotoluene, and control the reaction temperature of the material at 45-55°C. The reaction was incubated for 4 hours. Cool the feed liquid, and when the temperature of the feed drops to 20-30°C, centrifuge to obtain BP-1 with a yield of 99.2% and a product purity of 98.5%.

[0023] Then put BP-1 in toluene solution, remove impurities with phosphoric acid, decolorize activated carbon and white clay, and obtain BP-1 high-quality product with a yield of 99...

Embodiment 2

[0025] Raw material preparation:

[0026] Resorcinol 100kg

[0027] Trichlorotoluene 700 kg

[0028] Ethanol 30 kg

[0029] Methanol 50 kg

[0030] 800 kg of water

[0031] First add water to the reaction kettle, turn on the steam to raise the water temperature to 35-36°C, then put resorcinol into the reaction kettle, start stirring for 5-10 minutes to completely dissolve the resorcinol, then add methanol and ethanol Put it in the reactor. Control the amount of steam and slowly heat the material to 50-60°C, add trichlorotoluene, and control the reaction temperature of the material at 45-55°C. The reaction was incubated for 4 hours. Cool the feed liquid, and when the temperature of the feed drops below 30°C, centrifuge to obtain BP-1 with a yield of 99.1% and a product purity of 98%.

[0032] Then put BP-1 in toluene solution, remove impurities with phosphoric acid, decolorize activated carbon and white clay, and obtain BP-1 high-quality product with a yield of 99%, a pr...

Embodiment 3

[0034] Raw material preparation:

[0035] Resorcinol 100kg

[0036] Trichlorotoluene 1300 kg

[0037] Ethanol 40 kg

[0038] Methanol 200 kg

[0039] 1200 kg of water

[0040] First add water to the reaction kettle, turn on the steam to raise the water temperature to 36-38°C, then put resorcinol into the reaction kettle, start stirring for 5-6 minutes to completely dissolve the resorcinol, then add methanol and ethanol Put it in the reactor. Control the amount of steam to slowly heat the material to 50-60°C, add trichlorotoluene, and control the reaction temperature of the material at 45-55°C. The reaction was incubated for 3 hours. Cool the feed liquid, and when the temperature of the feed drops to 28-30°C, centrifuge to obtain the centrifuged BP-1 crude product. The yield is 99.5%, and the product purity is 98.6%.

[0041] Then put BP-1 in toluene solution, remove impurities with phosphoric acid, decolorize activated carbon and white clay, and obtain BP-1 high-quality...

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PUM

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Abstract

A 2,4-dihydroxyldiphenylketone preparation method which adopts resorcinol, trichlorotoluene, ethanol, methanol and water as main raw materials comprises the following steps: adding water in a reaction tank, heating water with steam to 35-38 DEG C, then adding resorcinol in the reaction tank, starting stirring to dissolve resorcinol completely, then adding ethanol and methanol in the reaction tank, controlling the quantity of steam to heat the materials to 50-60 DEG C, adding trichlorotoluene to react for 3-4h while controlling the material reaction temperature to 45-55 DEG C and keeping the temperature, cooling feed liquid to reduce the material temperature to 20-30 DEG C and finally obtaining 2,4-dihydroxyldiphenylketone by centrifugal separation. The method realizes that the yield is 99% and the product purity can reach more than 98%.

Description

technical field [0001] The invention relates to the field of light stabilizer production, in particular to a production method of benzophenone ultraviolet absorber-2,4-dihydroxybenzophenone (hereinafter referred to as BP-1). Background technique [0002] In recent years, with the rapid development of the petrochemical industry, the plastic industry as a branch has also been developed. Not only the number has increased rapidly, but also the variety has continued to increase, especially in the field of construction and decoration. Trends in traditional materials such as aluminum alloys. This in turn promotes the sustainable development of the plastics industry. However, one of the Achilles' heels of plastic products is that they are prone to "aging", that is, structural changes occur due to sunlight and ultraviolet radiation, resulting in discoloration, brittleness, and hardening of plastic products, which greatly limits the scope of use of plastic products. In order to solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/83C07C45/42
Inventor 赵定春袁明翔孙大明
Owner 宜都市华阳化工有限责任公司
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