Continuous refinement separation device and method of coked crude phenol

Abstract

The invention relates to a continuous refinement separation device and method of coked crude phenol. The continuous refinement separation device comprises a static mixer 1, a first stage pretreatment acid-adding unit composed of a first stage mixing slot 2 and a wipe film evaporator 3, a second stage pretreatment oxidation unit composed of a second stage mixing slot 4 and a buffer tank, a phenol residue removing tower 6 and a rectification tower system composed of a dewatering tower 7, a phenol refinement tower 8, a orthocresol refinement tower 9 and a m,p-cresol refinement tower 10, wherein the first stage pretreatment acid-adding unit is connected with the phenol residue removing tower, the phenol residue removing tower is connected with the second stage pretreatment oxidation unit, andthen all devices of the refinement tower system are connected together in turn. The device and method of the invention can effectively performs processes of decoloring, deodorizing, desulfurizing, removing impurity and the like to the coked crude phenol raw material through reasonable design to obtain more than 99.5wt% of high purity phenol, more than 99.0wt% of high purity orthocresol, more than99.0wt% of high purity m,p-cresol and xylenol product. The whole process is reasonable, has high degree of automation and is characterized by low process energy consumption, high product quality, good stability and the like, thus the method of the invention is an effective and feasible coked crude phenol continuous refinement separation technology.

Description

technical field [0001] The invention belongs to a device and method for chemical separation process, and relates to a refining method of coking crude phenol, specifically a continuous rectification and separation device and method for coking crude phenol. Background technique [0002] Coking phenols are one of the main chemical products extracted from coal tar. The composition and yield of each crude phenol raw material are related to the coal blending composition, coal blending properties and the conditions of coal coke operation. On the one hand, its source comes from coal tar fractionation The phenol oil fraction produced in the coal gasification process, on the other hand, comes from the phenolic compounds extracted from the phenol-containing wastewater produced in the coal gasification process. The crude phenolic components of the two sources basically contain phenol, o-cresol, and m-p-cresol , water, xylenol, higher phenol and its asphalt and other impurities. [0003...

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Problems solved by technology

As we all know, due to the process characteristics of batch rectification and the heat-sensitive characteristics of phenolic compounds, there must be phenomena such as decomposition and carbonization of phenolic compounds in the separation process of batch rectification, which will affect the quality and yield of products, so that the whole process The stability of the product quality is poor. At the same time, the transitional fraction between the components in the batch rectification process requires repeated rectification, which also results in a large energy consumption in the entire separation process. Obviously, from the perspective of process reliability and economy Generally speaking, the device and process for refining and separating crude phenol by batch distillation are no longer suitable for large-scale treatment of coked crude phenol

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