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Green synthetic method for phenol by directly hydroxylating benzene

A green synthesis and hydroxylation technology, applied in the field of green synthesis, can solve the problems of low phenol yield, inconvenient operation, and long process, and achieve the effects of improving phenol selectivity, simple production process, and avoiding deep oxidation

Inactive Publication Date: 2008-01-09
HARBIN UNIV OF SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

High requirements on control and safety technology, long process, high energy consumption, low phenol yield of no more than 5%, inconvenient operation and environmental pollution are not in line with the strategy of sustainable development

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] A green synthesis method for the direct hydroxylation of benzene to produce phenol. The distance between the needle tip and the water surface in the plasma reactor is fixed at 2cm, a 30kV DC high voltage is applied to the needle electrode to generate corona discharge, and the temperature of the reactor is controlled at 65°C. The molar ratio of entering oxygen and benzene is 2: 1 feed gas, the volume ratio of balance gas helium or argon can be 40% or 60% or 80%, and the flow rate is controlled so that the gas stays in the reactor for 5min, and the conversion rate of benzene 38%, phenol selectivity of 85%.

Embodiment 2

[0021] The green synthesis method of the direct hydroxylation of benzene to produce phenol described in Example 1, the distance between the needle point and the water surface in the plasma reactor is fixed at 1 cm, a 30 kV DC high voltage is applied to the needle electrode to generate corona discharge, and the temperature of the reactor is controlled to 65°C, feed raw material gas with a molar ratio of oxygen and benzene of 2:1, balance gas helium or argon with a volume ratio of 40% or 60% or 80%, control the flow rate so that the gas stays in the reactor for 5 minutes , the conversion rate of benzene is 46%, and the selectivity of phenol reaches 90%.

Embodiment 3

[0023] The green synthetic method of the direct hydroxylation of benzene to produce phenol described in embodiment 1 or 2, the distance between the needle tip and the water surface in the plasma reactor is fixed at 3cm, and a 30kV DC high voltage is applied to the needle electrode to generate corona discharge, and the reactor is controlled The temperature is 65°C, feed the raw material gas with a molar ratio of oxygen and benzene of 2:1, the volume ratio of the balance gas helium or argon is 40% or 60% or 80%, and the flow rate is controlled to make the gas flow in the reactor After staying for 5 minutes, the conversion rate of benzene was 30%, and the selectivity of phenol reached 72%.

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Abstract

A green synthesis of phenol by benzene hydroxylation directly is carried out by apply DC high-voltage 10-30 kV onto plasma reactor to generate corona, discharging, keeping temperature of plasma reactor between 50-80 deg. C, inducing into raw material containing benzene and oxidant into reactor in proportion of 1:1-6 mol, keeping for 5-10 mins and oxidizing into phenol. It's simple and convenient, has short flow path, less consumption, more yield and no environmental pollution.

Description

Technical field: [0001] The invention relates to a green synthesis method for preparing phenol by direct hydroxylation of benzene. Background technique: [0002] Phenol, also known as carbolic acid, is one of the important basic organic raw materials. It is mainly used in the manufacture of various chemical products such as phenolic resins, caprolactam, bisphenol A, adipic acid, alkylphenols, aniline, plasticizers, and insecticides. In 2003, the total consumption of phenol in the world was about 7.35 million tons, and in 2004 the total consumption increased to about 7.48 million tons. With the rapid development of my country's automobile, electronics, construction and metallurgical industries, the market demand for phenol and its downstream products has increased sharply. It is estimated that by 2007, the domestic demand for phenol will reach 1 million tons. [0003] The cumene method is currently the most important phenol production method in the world, and its production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/04C07C37/58
Inventor 董丽敏韩志东张显友
Owner HARBIN UNIV OF SCI & TECH
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