Catalyst concentration and proportion controlling method for p-xylene oxidizing reaction

A technology of catalyst concentration and oxidation reaction, which is applied in the direction of chemical instruments and methods, preparation of organic compounds, reagents, etc., can solve problems such as increased ash content, increased combustion reaction products, difficult filter operation, etc., and achieves good product quality and low unit consumption Good results

Inactive Publication Date: 2005-10-26
SINOPEC YANGZI PETROCHEM +1
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Problems solved by technology

[0005] In addition, the cocatalyst Br - When the concentration increases within a certain concentration range, the content of 4-CBA in the product decreases and the combustion reaction product increases; Br - A decrease in the concentration will cause an increase in ash content, difficulty in the operation of the filter, and an increase in the amount of 4-CBA in the product

Method used

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  • Catalyst concentration and proportion controlling method for p-xylene oxidizing reaction
  • Catalyst concentration and proportion controlling method for p-xylene oxidizing reaction
  • Catalyst concentration and proportion controlling method for p-xylene oxidizing reaction

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Embodiment Construction

[0016] 1. Design and installation of process filter

[0017] The mother liquor separated from the PTA slurry after filtration contains a certain amount of PTA solids (referred to as mother solids). It is of great significance to recycle this part of the mother solids from an economic or environmental point of view. Therefore, almost all PTA plants Both are equipped with a parent solid material recovery unit to circulate the PTA parent solid material back to the feed of the oxidation unit as a raw material for reuse.

[0018] However, it is precisely because of the circulation of the parent solid material that the solid content in the reactor feed is relatively high, so that when passing through the filter pretreatment unit of the analyzer, the large particle slurry is blocked at the sampling port, resulting in the failure of the analyzer to perform normal operations. sampling. In order to ensure the normal operation of the online analyzer, such as figure 2 As shown, a Y-typ...

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Abstract

The method of controlling the concentration and proportion of catalyst Co2+ ion and Mn2+ ion and cocatalyst Br- ion for p-xylene oxidizing reaction includes installing sampling filter with less jamming; homogenizing processing of analyzer measured data by means of industrial process data cooperating and correcting technology, dynamic process leading / lagging compensation technology, etc.; and rolling optimizing correction of the measured data with manual analysis value to obtain real-time measured value of catalyst concentration. Based on the method, one real-time control system for the induction, feedforward and feedback of Co2+, Mn2+ and Br- ion concentrations is developed.

Description

1. Technical field [0001] The invention belongs to the field of chemical reaction engineering, and relates to a method for controlling the concentration ratio of catalysts in feedstock for oxidation reaction of p-xylene (P-xylene, PX) in the production of pure terephthalic acid (PTA). 2. Background technology [0002] Among various production processes of crude terephthalic acid (Terephthalic Acid, TA), PX oxidation reaction has gradually become the mainstream process for producing TA due to its advantages of low acid consumption and material consumption. Therefore, the method for controlling the ratio of catalyst concentration in the oxidation reaction feed is also aimed at this production process. figure 1 A block diagram showing the process flow for the formulation of feed concentrations for typical PX oxidation reactions. The PX oxidation reaction process is: the raw material (liquid phase PX) and acetic acid, a certain catalyst (containing Co 2+ , Mn 2+ 、Br - ) to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/265C07C63/26
CPCY02P20/141
Inventor 钱锋邢建良杜文莉王振新颜学峰李维新殷继勇刘志明张井满唐宏林吴菊萍万小平丁家海
Owner SINOPEC YANGZI PETROCHEM
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