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Method for directly synthesizing phenyl hydrate by catalyzing dioxygen and liquid-phase oxidation benzene

A technology of molecular oxygen liquid and benzene oxidation, which is applied in chemical instruments and methods, preparation of organic compounds, molecular sieve catalysts, etc., can solve the problems of low yield and high cost, and achieve high economic value, low production cost and mild conditions Effect

Inactive Publication Date: 2010-06-16
南通国邦科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high cost and low yield in the existing method for directly synthesizing phenol, and to provide a method for directly synthesizing phenol by catalytic molecular oxygen liquid phase oxidation of benzene

Method used

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Effect test

specific Embodiment approach 1

[0007] Specific embodiment 1: The method for directly synthesizing phenol by catalyzing molecular oxygen liquid-phase oxidation of benzene in this embodiment is realized according to the following steps: 1. Using SBA-16 mesoporous molecular sieve as a carrier, impregnation method supports vanadium to obtain a catalyst; 2. In stainless steel under high pressure Add 0.05 to 0.15 catalyst, 1.05 to 2.1 ascorbic acid, 2.4 to 2.8 benzene and 20 to 30 acetic acid in the reaction kettle in sequence, and then feed oxygen with a concentration of 99% to make the pressure 1.0 to 2.0 MPa , react under the condition of 60-80 DEG C for 1-8h, filter after cooling, and obtain phenol after separation and purification; wherein the loading capacity of vanadium in step 1 is 6-10% of the mass of the carrier; the mass concentration of acetic acid in step 2 is 50% ~90%.

[0008] The separation and purification in this embodiment adopts conventional methods in this technical field.

specific Embodiment approach 2

[0009] Embodiment 2: This embodiment differs from Embodiment 1 in that the vanadium load in step 1 is 8% of the mass of the carrier. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0010] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 2, 0.09 catalyst, 1.5 ascorbic acid, 2.6 benzene and 25 acetic acid are sequentially added according to the ratio of parts by mass. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a method for directly synthesizing phenol by catalyzing molecular oxygen to perform liquid-phase oxidation to benzene, which relates to a method for directly synthesizing the phenol and solves the problems that the prior method for directly synthesizing the phenol has high cost and low yield. The method is as follows: 1. catalyst is prepared; 2. the catalyst, ascorbic acid,benzene and acetic acid are orderly added into a reaction kettle, oxygen is aerated, and then the mixture reacts under appropriate temperature conditions, cooled, filtered, separated and purified to produce the phenol. The method has low production cost, can produce high benzene transfomration rate when high benzene selectivity is obtained, and has high benzene yield; and the transformation rate of the benzene is between 15.4 and 28.2 percent, the selectivity of the phenol is between 70 and 80 percent, and the yield of the phenol is between 15.0 and 18.7 percent.

Description

technical field [0001] The invention relates to a method for directly synthesizing phenol. Background technique [0002] Phenol is an important and basic organic chemical raw material, widely used in industry. At present, the industrial production method of phenol in the world is mainly the cumene method, but the yield of its by-product acetone is large. There are gas-phase method and liquid-phase method for the direct catalytic synthesis of phenol by benzene, but the catalyst used in the gas-phase method is deactivated in a short time; while the liquid-phase method using hydrogen peroxide as oxidant has low utilization rate of hydrogen peroxide, storage, The disadvantages of dangerous transportation and high cost. Molecular oxygen is the most widely sourced, most economical and cleanest oxidant. At present, the liquid phase method using molecular oxygen as an oxidant has a lower reaction temperature and higher selectivity, but the conversion rate is low, and the yield of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C39/04C07C37/60B01J29/00
CPCY02P20/52
Inventor 朱宇君袁福龙董永利赵丽娜潘喜强付宏刚
Owner 南通国邦科技发展有限公司