Built-in micro-interface unit enhanced reaction system for producing PTA through PX and process thereof

Abstract

The invention provides a built-in micro-interface unit enhanced reaction system for producing PTA through PX and a process thereof. The system comprises a reactor and a micro-interface unit arranged in the reactor. The reactor comprises a shell, an inner barrel concentrically arranged in the shell, and a circulating heat exchange device partially arranged outside the shell; wherein the bottom endof the inner cylinder is connected to the inner bottom surface of the shell in a closed manner, the top end of the inner cylinder is open, an area between the shell and the inner cylinder is a first reaction area, a second reaction area and a third reaction area are sequentially arranged in the inner cylinder from top to bottom, and the circulating heat exchange device is respectively connected with the inner cylinder and the micro-interface unit. According to the method, the problems that a large amount of reaction solvent acetic acid is wasted at high temperature and high pressure and a product TA cannot be taken out in time in the existing process of producing PTA through PX are effectively solved, so that the energy consumption is greatly reduced, an acetic acid solvent is saved, and the reaction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a system and process for intensifying the reaction of a built-in micro-interface unit for producing PTA with PX. 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 rea...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention proposes a built-in micro-interface unit enhanced reaction system and process for PX production of PTA, aiming 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 cannot be taken out in time Product TA problem

Images