PX produces PTA's external micro-interface unit to strengthen the oxidation system

Abstract

The present invention provides an enhanced oxidation system with an external micro-interface unit for producing PTA from PX, comprising: a reactor, a circulation heat exchange device and a micro-interface unit; wherein, the reactor includes a shell and is concentrically arranged inside the shell The inner cylinder; the circulation heat exchange device is arranged outside the reactor, and is connected with the outer shell and the inner cylinder respectively, so as to adjust the first reaction zone and the second reaction zone inside the reactor. And the reaction temperature in the reaction process of the third reaction zone; the micro-interface unit is connected between the reactor and the circulation heat exchange device, and is connected with the external feed pipe of the reactor. The present invention effectively solves the problem that the reaction solvent acetic acid is wasted in large quantities under high temperature and high pressure in the existing PX production process of PTA, and the problem that the product TA cannot be taken out in time at the same time, thereby greatly reducing energy consumption, saving acetic acid solvent, and improving the Reaction efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an enhanced oxidation system of an external micro-interface unit for PX production of PTA. Background technique [0002] The oxidation reaction process of PX (p-xylene) to produce TA (terephthalic acid) is very complicated, mainly including 4 steps, namely p-xylene (PX) → p-tolualdehyde (TALD) → p-toluic acid ( p-TA) → p-carboxybenzaldehyde (4-CBA) → terephthalic acid (TA), the four oxidation reactions in this reaction process are series reactions, which generally use acetic acid as solvent, cobalt acetate, manganese acetate and Hydrobromic acid (or tetrabromomethane) is the catalyst. [0003] At present, in the existing PTA production technology, the four main steps in the oxidation reaction process are all carried out in the same reactor. Although the reaction rate constants of the above four steps differ by more than ten times, the mixed reaction process is adopted,...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention proposes an external micro-interface unit enhanced oxidation system for PX production of PTA, which aims to solve the problem that the reaction solvent acetic acid is wasted in large quantities under high temperature and high pressure in the existing PX production PTA process, and the product cannot be taken out in time TA's question

Images