Coked crude phenol refining device and method

Abstract

The invention provides a coked crude phenol refining device. The device adopts the scheme that a crude phenol pre-distillation system, an impurity conversion system and a refining distillation system are sequentially connected through pipelines, wherein the crude phenol pre-distillation system is composed of a dehydration tower and a de-heavy tower, which are connected; the impurity conversion system is composed of a middle tank and an adsorption reaction tower, which are connected; the refining distillation system is composed of a phenol tower, an o-cresol tower and a m-cresol and p-cresol tower, which are connected in sequence. According to the invention, the problem of impurity removal in the adsorption reaction tower is solved through a sweetening catalyst, so that the fact that a liquid oxidizing agent is added into raw material crude phenol is avoided and the operation and control are simpler and more convenient; the conventional intermittent distillation process of phenol fractions is eliminated, so that the whole crude phenol refining process becomes very refined and the processing cost of products is reduced greatly; the whole production process flow is reasonable, the device is high in automation degree, the product quality is high and the energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of distillation and separation of chemical materials, and relates to a refining device and method for improving the purity of coked phenol products and shortening the separation process, in particular to a refining device and method for coking crude phenol Background technique [0002] Phenolic products were separated and refined from coal tar in the early days, and there are still many domestic coking enterprises producing such products. Now there are a large number of phenol and o-cresol products that can be produced by chemical synthesis. According to statistics, more than 92% of phenol in the world is currently produced by the cumene method, and phenol with a purity of more than 99.9% can be obtained, which meets the requirements for the production of polycarbonate. [0003] In the coking industry, the recovery of phenol mainly uses 10% to 12% sodium hydroxide to wash the distilled fraction of tar and t...

AI Technical Summary

Problems solved by technology

The operating conditions of this patent are obtained by distillation from coal gasification crude phenol as raw material, which is not suitable for processing coked crude phenol raw material, that is, the qualified phenol product cannot be produced by processing coked crude phenol according to the patent conditions

In this patent, deslagging is performed first, followed by oxidation, and then dehydration process. In fact, when the water content of crude phenol is high, stable distillation cannot be achieved.

Due to the high moisture content and secondary distillation in the whole production process, the energy consumption of distillation will be increased, which lacks the advancement and practicability of the process.

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