Metacresol deep desulfurization system and process

Abstract

The invention relates to the technical field of chemical process, and relates to a m-cresol deep desulfurization system and process, the m-cresol deep desulfurization system comprises a raw material tank (1), an oxidation unit and a rectification unit, the oxidation unit comprises an oxidation kettle (2), the inlet of the oxidation kettle (2) is connected with the outlet of the raw material tank (1), the rectification unit comprises a rectification tower (4) and a condenser (5), the outlet of the oxidation kettle (2) is connected with the rectification tower (4), and the condenser (5) is connected with the rectification tower (4). An outlet of the rectifying tower (4) is connected with an inlet of the condenser (5), one path of an outlet of the condenser (5) is connected with the rectifying tower (4), and one path outputs a m-cresol product. The process comprises an oxidation process, a rectification process and a reflux process. The system disclosed by the invention is simple in structure, simple in equipment assembly, convenient to operate and suitable for industrial production, the process disclosed by the invention is green, environment-friendly, low in energy consumption and easy to operate, and the sulfur content in the m-cresol can be reduced to be below 1ppm required by the market.

Description

technical field [0001] The invention relates to the technical field of chemical technology, relates to a system and a process for deep desulfurization of m-cresol, in particular to a process for deep removal of ultra-low concentration sulfide impurities in m-cresol. Background technique [0002] m-cresol (3-methylphenol) is an important fine chemical raw material, widely used in medicine, pesticides, antioxidants, dyes, fragrances, fungicides, fungicides and other fields. Important intermediates in plasticizers and other industries. [0003] The production process of m-cresol is divided into two categories: extraction method and synthesis method. The extraction method is to recover mixed cresol from the by-product of coal tar, and then separate it. [0004] my country is a major coke country in the world. The extraction of m-cresol from coal tar, a by-product of coking, is an important source of m-cresol production in my country at this stage. Since coal contains sulfur, c...

AI Technical Summary

Problems solved by technology

The usual pickling and alkali washing desulfurization process will produce a large amount of waste water, which cannot meet the requirements of environmental protection, and the effect is not ideal

Because the sulfur-containing impurities in m-cresol obtained by the extraction process are mainly sulfur-containing compounds such as thiophenol, mercaptan and thiophene, the content is only 2-10ppm, and the boiling point of the above-mentioned sulfur-containing compounds is very close to that of m-cresol , it is difficult to directly separate the above-mentioned sulfides from m-cresol by rectification; on the other hand, the method of rectification desulfurization consumes a lot of energy, requires a large investment, and the desulfurization effect is not satisfactory

Images