Intelligent oxidation system and method for preparing terephthalic acid from p-xylene

Abstract

The invention provides an intelligent oxidation system for preparing terephthalic acid from p-xylene. The intelligent oxidation system comprises a first reactor, a rectifying tower and a second reactor which are connected in sequence, and further comprises a DCS intelligent management system. The DSC intelligent management system comprises an intelligent robot, a DSC basic control system, a serverhost and an external network server, wherein the robot is used for sending out an instruction signal and executing the instruction signal after receiving an external network server signal; the DSC basic control system is connected with the server host; the server host is in two-way communication with the extranet server; and the extranet server is in wireless connection with the intelligent robot. According to the intelligent oxidation system disclosed by the invention, the DSC intelligent control system is mounted to carry out full-automatic control on a segmented process, so errors caused by manual operation are avoided, the stability and safety of a reaction process are improved, the automatic production and management level of an enterprise is improved, and the use of manpower is reduced, thereby saving the cost of the enterprise.

Description

technical field [0001] The invention relates to the field of oxidation reaction for preparing terephthalic acid from paraxylene, in particular to an intelligent oxidation system and method for preparing terephthalic acid from paraxylene. Background technique [0002] There are various physical and chemical reactions, phase transition processes, and material and energy conversion and transfer processes in the oxidation reaction of p-xylene to terephthalic acid. It is a rather complex process, and the controlled processes involved have strong coupling. It has the characteristics of uncertainty, uncertainty, nonlinearity, incomplete information and large pure hysteresis, and there are strict constraints, high control requirements for temperature, pressure and flow, and accurate mixing and reliable control are required in the production process. However, These are difficult to achieve by manual operation and semi-automatic control. In addition, too much labor leads to reduced be...

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Problems solved by technology

[0002] There are various physical and chemical reactions in the oxidation reaction process of p-xylene to terephthalic acid, the phase transition process, the conversion and transfer process of matter and energy, which is a rather complicated process, and the controlled processes involved have strong coupling characteristics such as uncertainty, uncertainty, nonlinearity, incomplete information, and large pure hysteresis, and there are strict constraints, and the requirements for temperature, pressure, and flow control are high, and the production process requires accurate mixing and reliable control. However, These are difficult to achieve by manual operation and semi-automatic control. Moreover, too much labor leads to reduced benefits and great safety hazards. When problems are found, they are all solved manually, and it is difficult to provide safety guarantees for on-site problem handlers.

[0003] And in the prior art, the mass transfer efficiency of the oxidation reaction device is generally low, the reaction mixed raw material and air cannot be fully mixed, and the phase boundary area is limited, resulting in a low conversion rate of the raw material and reducing the yield of terephthalic acid. In the process, high temperature and high pressure operation has to be adopted, and the mass transfer area and mass transfer efficiency are improved by increasing the solubility of the gas-liquid phase. However, the first two reaction steps use acetic acid as a solvent, and high temperature and high pressure are not suitable. The existing technology uses a mixed reaction process, accompanied by a large number of side reactions, resulting in large consumption of acetic acid, high energy consumption, high impurity content, and product quality cannot be guaranteed

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