Method for separating diisopropylbenzene isomeride by virtue of reduced pressure batch distillation

Abstract

The invention relates to a device and method for separating diisopropylbenzene isomeride by virtue of reduced pressure batch distillation. The device is a batch distillation tower consisting of a tower kettle, a material inlet, a distillation tower, a liquid distributor, a condenser, a catcher and a reflux tank, wherein one end of the reflux pipeline of the reflux tank is connected with the top of the distillation tower, and the other end of the reflux pipeline of the reflux tank is connected with a tower top product transition fraction tank and a tower top product tank; and simultaneously, avacuum tank is respectively connected with the catcher and the tower top product transition fraction tank as well as the tower top product tank through a buffer tank. When the pressure of the tower top is 132.0Pa-1320.0Pa, the temperature of the tower top is 80.0-82.0 DEG C and the temperature of the tower kettle is 90.0-95 DEG C, the variable reflux ratio operation is carried out: the operation reflux ratio when m-diisopropylbenzene with the purity above 99.0wt% is extracted is 7 / 1-9 / 1, and the operation reflux ratio when p-diisopropylbenzene with the purity of 99.0wt% is extracted is 15 / 1-20 / 1. The process has the characteristics of short operation time, low tower kettle temperature, less energy consumption and no thermosensitive reaction, and ensures that the purity of the separated product is high.

Description

technical field [0001] The invention relates to a device and a method for separating isomers of dicumyl by vacuum batch rectification. Background technique [0002] Resorcinol is a high value-added fine chemical product, which can be used to synthesize many fine organic chemical intermediates. It is widely used in industrial fields such as rubber, medicine, pesticides, and dyes, and has high development value. At present, the production methods of resorcinol mainly include sulfonated alkali fusion method, m-dicumene oxidation method and co-production method of resorcinol and phenol. The synthesis of m-diphenol by m-dicumene oxidation method has advanced technology and less pollution, which is a promising production route. Traditional dicumene is a by-product in the production process of cumene, and the ratio of the three isomers is between: right: o=65:34:1, because the content of o-dicumene is very small, so It is sufficient to separate m-dicumyl and p-dicumene. m-dicume...

AI Technical Summary

Problems solved by technology

m-dicumene and p-dicumene have high boiling points and have certain heat sensitivity. Their boiling points are 203°C and 210.3°C respectively. It can be seen that their boiling points are relatively close, and the relative volatility of the two is relatively small. The distillation method not only requires a large number of theoretical plates, but also has a long operating time and high energy consumption in the process, and the product is prone to heat-sensitive reactions.

Only some relevant synthetic methods have been reported in the current domestic and foreign literature, and there are few reports on relevant separation methods.

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