PTA-USED PLANT ON SALES & UPGRADING

Available is used PTA plant for sales and upgrading

PTA is a crucial chemical compound used in the production of polyethylene terephthalate (PET) and polyester fibers, which are widely used in consumer products like clothing, plastic bottles, and food packaging. PTA is a white solid with the chemical formula C₆H₄(CO₂H)₂.

Two-Stage vs. One-Stage Processes

PTA production technologies can also be classified by their purification approach:

Two-Stage Process (Conventional):

PX oxidation to produce crude terephthalic acid (CTA)
CTA purification through hydrogenation to produce PTA

4-CBA content <25 ppm
Higher purity suitable for all polyester applications

One-Stage Process:

Direct production of PTA through extended oxidation
4-CBA content 200-300 ppm (classified as MTA - Medium purity Terephthalic Acid)
Lower capital and operating costs
Primarily used for fiber-grade polyester

Main PTA Production Methods

The PTA manufacturing industry primarily utilizes two fundamental production approaches:

1. Direct Esterification Method (DMT Method)

The direct esterification method represents a traditional approach to PTA production, involving a two-step process:

First Stage: Synthesis of dimethyl terephthalate (DMT) through esterification reactions
Second Stage: Ester exchange reactions to convert DMT into PTA

Key Characteristics:

Mature technology with well-established process controls
Stable product quality with consistent specifications
Higher production costs due to additional processing steps
Greater energy consumption compared to modern methods
Larger environmental impact from byproducts and emissions 1

While this method was widely used in early PTA production facilities, its market share has significantly declined due to the emergence of more efficient technologies.

2. Air Oxidation Method (PX Method)

Air Oxidation Method (PX Method)

The air oxidation method has become the industry standard for PTA production, accounting for the majority of global capacity. This method directly utilizes para-xylene (PX) as the primary feedstock:

Process Flow:

Catalytic oxidation of PX in the presence of air/oxygen
Purification steps to remove impurities and byproducts
Crystallization and drying to produce final PTA product

Advantages:

Simpler process flow with fewer intermediate steps
Lower energy requirements leading to reduced operating costs
Smaller environmental footprint with fewer emissions
Higher production efficiency and better economies of scale

The air oxidation method's superior cost-effectiveness and environmental performance have made it the dominant technology in modern PTA production facilities worldwide.

Used Plant Transfer and Upgrading

PROCESS FEATURES

Highly Integrated Process
Sophisticated Reaction Technology High yield of PTA from Para-xylene Excellent Acetic acid and atalyst consumption Long PTA Catalyst Life (2 years more)
High Performance Catalyst Recovery Unit
Excellent Energy Saving
Environment Friendly Process
Reliable and Stable Operation Know-how of Half Century Operation
Excellent and Stable Product Quality. (1) Excellent Quality for All PTA Application, (2) Excellent Transparency, 4CBA, Metal content, p- TA, Powder b and All Other Quality Index
Foreign Matter (FM) Control in PTA: (1) In-process PTA Filter and other know-how (2) Lower FM is one of Key Factor for Long Polymer Filter-life & High Performance in PET Production