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Method of drying terephthalic acid

A terephthalic acid and drying technology, applied in the separation/purification of carboxylic acid compounds, chemical industry, climate sustainability, etc., can solve the problems of increasing energy demand and heat exchange area, complex structure, and large heat loss. Achieve the effect of improving heat and mass transfer efficiency, realizing full utilization and reducing energy consumption

Inactive Publication Date: 2008-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the filtered TA contains a large amount of water (more than 10% in mass content), its latent heat of evaporation is huge, and most of the above-mentioned drying methods adopt the method of indirect heating, by setting tubes or partition walls in the dryer to provide heat with saturated steam, heat exchange Low efficiency, especially in the falling speed drying section, the heat loss is large and the heat transfer rate is low, which increases the energy demand and heat transfer area of ​​the process
In addition, the drier required by the current drying technology still has the problems of large volume and complex structure.

Method used

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  • Method of drying terephthalic acid
  • Method of drying terephthalic acid
  • Method of drying terephthalic acid

Examples

Experimental program
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Effect test

Embodiment

[0018] With an annual output of 600,000 tons (annual production time 7,600 hours) of terephthalic acid, the original drying process is to use a drum dryer to directly dry to the target humidity (0.1%), and all the required heat is provided by indirect heat exchange with low-pressure steam. The energy is about 4190Kw / h, and the amount of steam required is 7.15t / h.

[0019] Adopt the method of the present invention to dry terephthalic acid, relevant process parameters are listed as follows according to unit sequence:

[0020] 1. Drum dryer

[0021] Its operating parameters and output are shown in Table 1

[0022] Table 1 Operating parameters and output of drum dryer

[0023]

[0024] 2. Horizontal multi-chamber fluidized bed dryer

[0025] The equipment parameters and operating conditions are shown in Table 2, and the output parameters are shown in Table 3

[0026] Table 2 Parameters and operating conditions of horizontal multi-chamber fluidized bed dryer

[0027]

[...

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Abstract

The invention discloses a drying method of terephthalic acid, which comprises the following steps: 1) entering terephthalic acid slurry around the outlet of filter machine into cylinder drier or rotary steam tubular drier; drying at partition-wall typed exchanging pattern to critical moisture content; 2) condensing; adsorbing; heating; turbining reacting waste gas as dried gas; transmitting terephthalic acid into fluid bed drier through rotary transmitter; proceeding cross flow with dried flow from steam turbine; drying. The invention improves the efficiency of heat exchanging mass in the drying course, which reduces PTA energy consumption to utilize waste heat completely.

Description

technical field [0001] The present invention relates to a method for drying terephthalic acid. Background technique [0002] Aromatic carboxylic acids are important organic compounds and raw materials for the production of various chemical products, among which terephthalic acid (TA) has the largest output and is the most widely used. The world's production of terephthalic acid (TA) has reached 20 million tons per year. TA is mainly used for polymerization with ethylene glycol to produce ethylene terephthalate (PET). This polyester product is an important textile Fiber raw materials and packaging and container raw materials. TA can be produced by catalytic oxidation of p-xylene in air or other molecular oxygen sources under high temperature and high pressure conditions. Since Saffer of Mid-Century Company disclosed a method of oxidizing p-xylene to produce terephthalic acid in US Pat. [0003] In the above-mentioned production process, the reaction is carried out in the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/26C07C51/42
CPCY02P20/10
Inventor 王丽军邵可可李希
Owner ZHEJIANG UNIV