P-xylene oxidation reaction operation condition optimization method

Abstract

The present invention discloses an optimized technology of operating conditions of a xylene oxidation reactor which adopts Mitsui art, the optimized technology is that the reaction temperature of a reactor, the time that liquid stays in the reactor, the cobalt ion concentration of feeding of the reactor, the manganese ion concentration, the bromine ion concentration and the solvent ratio can be selected as the input variables of models during the xylene oxidation reaction; the content of carboxyl benzaldehyde in the products which can reflect the reacting results of the reactor, the total content of carbon monoxide and carbon dioxide in the exhaust gas which reflects burning loss of the reactor can be selected as the dependent variable of the models; the present invention can use the real production data of an industrial reactor as a training sample to build up a neural network model during the xylene oxidation reaction, and further to be optimized calculation on operating conditions of the reactor, so as to get the best operating conditions of the reactor make sure that the content of carboxyl benzaldehyde in the reacting products can meet the requirement, and the total content of carbon monoxide as well as carbon dioxide in the exhaust gas can be reduced to the minimum.

Description

technical field [0001] The invention belongs to the cross field of chemical reaction engineering and automation, and relates to a method for optimizing the process operating conditions of a p-xylene (PX) oxidation reactor in a pure terephthalic acid (PTA) Mitsui process industrial production device. Background technique [0002] PTA is an important raw material for the synthesis of polyester fibers and plastics, and is mainly used to synthesize polyester intermediate ethylene phthalate (PET). The PTA production process mainly includes: the American BP-AMOCO process, the British ICI process and the Japanese Mitsui process. The present invention is aimed at the PX oxidation reactor of the Mitsui process. The Mitsui Process PX oxidation reactor is at the core of the Mitsui Process PTA production, and whether its operating conditions are suitable is directly related to the quality of the oxidation unit product crude terephthalic acid (TA), that is, p-carboxybenzaldehyde (4-CBA) ...

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Problems solved by technology

[0005] From the above analysis, it can be seen that the influence of each process operating condition on the PX oxidation reaction process is quite complex, showing a highly nonlinear characteristic; and the current understanding of the mechanism of PX oxidation reaction and side reactions is limited, and there is a lack of information on the effect of each operating condition on the oxidation reaction depth and combustion side reactions. Quantitative knowledge; the source of raw materials and production load are often changed, and the operating conditions of the oxidation reactor are adjusted only based on production experience, often causing product quality indicators to meet production requirements, but the combustion loss is too large, or product quality indicators cannot meet production requirements at all

Oxidation reactors in industrial plants usually operate in a certain area deviated from optimal operating conditions, resulting in high material consumption and large fluctuations in product quality

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