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Modeling method for heterogeneous azeotropic rectification solvent dehydrating tower of industrial purified terephthalic acid (PTA) device

A pure terephthalic acid, azeotropic distillation technology, applied in the separation/purification, fractionation, special data processing application of carboxylic acid compounds, etc., can solve the problems of weakening the performance of the tower and affecting the azeotropic separation effect, so as to avoid The effect of actual blind operation, reducing optimization cost and improving production efficiency

Active Publication Date: 2012-05-30
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

A small amount of PX accumulates continuously in the tower. When its concentration increases to a certain level, it will inevitably weaken the performance of the tower and affect the effect of azeotropic separation.

Method used

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  • Modeling method for heterogeneous azeotropic rectification solvent dehydrating tower of industrial purified terephthalic acid (PTA) device
  • Modeling method for heterogeneous azeotropic rectification solvent dehydrating tower of industrial purified terephthalic acid (PTA) device
  • Modeling method for heterogeneous azeotropic rectification solvent dehydrating tower of industrial purified terephthalic acid (PTA) device

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] attached figure 1It is a process flow chart of the heterogeneous azeotropic distillation solvent dehydration tower of a domestic industrial purified terephthalic acid plant. The azeotropic distillation solvent dehydration tower is a three-stage packed tower, using n-propyl acetate (NPA) as an entrainer, wherein the feed includes WDO (from the water extracted from the oxidation reactor) that enters from the first and second stage packings. and the washing water of the high-pressure suction tower) and the overhead gas phase from the PX recovery tower, the gas phase from the stripping tower that enters from the second and third packings, the flash gas phase from the second crystallizer, and the gas phase from the first crystallizer Condensate from the vapor-liquid separator tank. A stream of liquid is extracted between the first and second packing...

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Abstract

The invention relates to a modeling method for a heterogeneous azeotropic rectification solvent dehydrating tower of an industrial purified terephthalic acid (PTA) device. In the method, the vapor-liquid balance experimental data of an acetic acid, n-propyl acetate, water, p-xylene and methyl acetate quinary mixture system are associated and fitted with the binary interaction parameters of the quinary mixture system according to a thermodynamic property model; and according to the process data of the solvent dehydrating tower under the actual device design condition, a heterogeneous azeotropic rectification solvent dehydrating tower model of the industrial PTA device under the design condition is established, the accuracies of the thermodynamic model and parameters thereof of the quinary mixture system in a laboratory and a rectification tower mathematical steady model are verified, key parameters representing the separating property of the solvent dehydrating tower under the actual condition are acquired, the model is corrected and a process mechanism steady model capable of accurately describing the operating characteristics of the solvent dehydrating tower under the actual condition is established.

Description

technical field [0001] The invention relates to a modeling method of a heterogeneous azeotropic distillation solvent dehydration tower, especially a heterogeneous azeotropic distillation solvent dehydration tower using n-propyl acetate as an entrainer in an industrial purified terephthalic acid device modeling method. Background technique [0002] Purified Terephthalic Acid (PTA) is an important chemical raw material widely used in polyester and other chemical production. The production of PTA generally uses p-xylene (PX) as raw material and acetic acid (HAC) as solvent to catalyze and oxidize crude terephthalic acid (TA) at a certain temperature and pressure, and then refine it into high-purity refined paraxylene. Phthalic acid. When PX is oxidized to produce terephthalic acid, acetic acid is used as a solvent, and water (H 2 O) is formed, thus producing an aqueous solution of acetic acid. At the same time, due to the incomplete oxidation reaction and the occurrence of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00C07C63/26C07C51/46B01D3/14
Inventor 钱锋钟伟民杜文莉彭昌军叶贞成黄秀辉
Owner EAST CHINA UNIV OF SCI & TECH
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