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Method for determining size of bubbles in system for preparing TA through PX oxidation

A technology of bubbles and oxygen, applied in the direction of instruments, surface/boundary effects, measuring devices, etc., can solve the problems of easy decarboxylation of system substances, solvent combustion, and high price

Active Publication Date: 2021-07-06
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One is that under the reaction conditions, because the solvent acetic acid and the reaction accelerator bromine corrode the equipment, the reaction equipment must use expensive titanium materials; the other is that under the higher reaction temperature and air atmosphere, the system substances are prone to decarboxylation , solvent combustion and other side reactions

Method used

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  • Method for determining size of bubbles in system for preparing TA through PX oxidation
  • Method for determining size of bubbles in system for preparing TA through PX oxidation
  • Method for determining size of bubbles in system for preparing TA through PX oxidation

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Embodiment

[0084] This embodiment is based on the modeling method of the present invention, aiming at the continuous bubbling reactor and the existing operating conditions of the PX liquid-phase oxidation of TA in a certain enterprise, the effect of the size of the bubbles in the reactor on the micro-interface unit under pure aerodynamic conditions is studied. Effects on macroscopic reaction rates. The size of the bubbles in the reactor is affected by the reactor structure, physical parameters, and operating conditions, and its regulation model under purely pneumatic operating conditions can refer to the applicant's prior patent CN109684769A.

[0085] The calculation conditions are as follows:

[0086] Reactor Design Parameters:

[0087] Reactor height H 0 =4.8m; reactor cross-sectional area S 0 =0.9499m 2 ;

[0088] Liquid density ρ L =807kg / m 3 ; The molar mass of the liquid phase M 1 =0.049kg / mol;

[0089] Operating pressure P m =1.2MPa;

[0090] PX flow Q L =3.2×10 -3 m ...

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Abstract

The invention provides a method for determining a size of bubbles in a system for preparing TA through PX oxidation. The method comprises the following steps: (A) establishing a reaction equation for preparing TA through PX liquid phase oxidation; (B) when other reactions in which oxygen participates are not considered, obtaining the following mass transfer equilibrium equation according to the relationship that the oxygen mass transfer rate is equal to a reaction consumption rate; (C) establishing an EA mathematical expression; (D) establishing a liquid phase component concentration CB-CE mathematical relation; and (E) establishing an E-infinity mathematical relation. According to the method for determining the size of the bubbles in the system for preparing the TA through the PX oxidation, the design and operation of a micro-interface enhanced reactor are optimized by discussing the method for determining the optimum size of the bubbles in the system for preparing the TA through the PX oxidation.

Description

technical field [0001] The invention relates to the field of micro-interface strengthening, in particular to a method for determining the size of bubbles in the system of PX oxidation to TA. Background technique [0002] Micro-interface enhanced reactor gas-liquid phase interface area structure-effect control mathematical model modeling method (public number: CN107563051A) quantifies the relationship between the reactor bubble gas-liquid phase interface area and the structural parameters, operating parameters and physical parameters of the reactor . When the gas flow rate is constant, the smaller the bubbles, the larger the gas-liquid interface area, and the better the mass transfer performance. [0003] At present, the global industrial production of terephthalic acid TA mainly adopts the paraxylene PX homogeneous AMOCO process. The process uses air as the reaction gas raw material, Mn and Co catalysts, the operating temperature is 175-225°C, the TA yield is 90-97%, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 张志炳周政李磊张锋孟为民王宝荣杨高东罗华勋田洪舟杨国强曹宇刘甲
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD
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