Method for preparing phenol from benzene through one-step process

Abstract

The invention relates to a method for preparing phenol from benzene through a one-step process. According to the method, a catalyst treats coal-based active carbon as a carrier and a ferric salt as an active component, and the carrier of the catalyst is processed according to the following steps: 1, adding 100g of the coal-based active carbon washed by water to a flask, adding 250ml of a nitric acid solution with the concentration of 2-12mol/L, connecting a condenser tube to the flask, carrying out reflux processing for 10h in a 25-90DEG C water bath, absorbing a tail gas with an NaOH or Na2CO3 solution, fully washing the coal-based active carbon with tap water until the pH value is unchanged, leaching the coal-based active carbon with distilled water three times, carrying out pumping filtration, and drying the coal-based active carbon in a 110DEG C constant temperature drying box; and 2, dipping the coal-based active carbon in 20-50mL of an aqueous Fe2(SO4)3 solution with the concentration of 0.04-0.20mol/L, laying them aside for 0.5-24h at room temperature, carrying out pumping filtration, and drying the coal-based active carbon in the 110DEG C constant temperature drying box. The catalyst has the advantages of high activity, high selectivity, high stability, production cost reduction, and product quality improvement.

Description

technical field [0001] The invention relates to a method for preparing phenol from benzene in one step. Background technique [0002] Phenol is an important basic organic chemical raw material and is widely used in industry. At present, the industrial production of phenol mainly adopts the process of cumene, namely: alkylation of benzene to obtain cumene, oxidation of cumene to obtain cumene peroxide, and decomposition of cumene peroxide to produce phenol. The reaction route is long, the reaction energy consumption is large, the phenol yield is low, there is an intermediate product (oxidation product of cumene) that is prone to explosion, and the by-product acetone of equimolar amount with phenol will be produced, and the demand of acetone is much higher than that of phenol. Smaller than phenol, so acetone disposal is a big problem. In addition, acid and a variety of organic reagents need to be added to the three-step reaction, resulting in waste of resources, inconvenient...

AI Technical Summary

Problems solved by technology

Due to the cumbersome preparation of these catalysts, the high cost of catalyst preparation and the long reaction time, they have not been commercialized.

Zhang Jin et al. (Chinese invention patent ZL2003101041091) used activated carbon as a catalyst, hydrogen peroxide as an oxidant, and glacial acetic acid as a solvent to obtain a maximum yield of 13% of phenol, but the reaction temperature was relatively high (60°C).