Production of purified terephthalic acid

By using a pneumatic pipeline to form a liquid seal between the pneumatic rotary filter press and the collection container, the problems of unstable gas pressure control and gas circulation mode are solved, and a stable filtration and purification process is achieved.

CN115697959BActive Publication Date: 2025-10-17INVISTA TEKSTAJLS
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Patent Information

Application Number
CN202180042281.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-07-31
Filing Date
2021-07-27
Publication Date
2025-10-17
Estimated Expiration
2041-07-27

AI Technical Summary

Technical Problem

In the prior art, pneumatically driven rotary filter presses suffer from unstable gas pressure control and undesirable gas circulation patterns during the filtration of crude terephthalic acid, which results in solvent discharge and contamination of clean wash water, affecting the production efficiency of purified terephthalic acid.

Method used

Multiple pneumatic pipelines are used to connect the pneumatic rotary filter press to a common collection container, forming a liquid seal. This allows each rotary filter press to operate at slightly different pressures, controls the gas circulation mode, and achieves pressure balance.

Benefits of technology

The gas circulation mode is effectively controlled, avoiding solvent discharge and pressure instability, thus improving filtration efficiency and product purity.

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Abstract

System and process control gas flow in the production of purified terephthalic acid (PTA). In various embodiments, a method for the production of purified terephthalic acid includes providing a rotary filter press having a rotating filter drum, feeding slurry including terephthalic acid to the rotary filter press such that a filter cake including terephthalic acid is formed on the rotating filter drum, and discharging the slurry to a collection vessel, wherein a gas pressure tube is connected between the rotary filter press and the collection vessel and forms a seal between the rotary filter press and the collection vessel.
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