Method for reducing temperature of high temperature slurry to vacuum filtering system feeding temperature in refined terephthalic acid production process

A technology for the production process of purified terephthalic acid, applied in chemical instruments and methods, carboxylate preparation, organic compound preparation, etc., can solve the problems of high energy consumption, large water consumption, large investment in equipment, etc., and achieve volumetric Small size, less cooling water consumption, and the effect of reducing operating costs

Active Publication Date: 2008-02-13
SINOPEC YIZHENG CHEM FIBER
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Problems solved by technology

[0004] The purpose of the present invention is to reduce the high-temperature slurry greater than 100 degrees to the temperature required by the vacuum filtration system in the existing purified terephthalic acid production process. Due to the problems of large water volume, high energy consumption, and large investment in equipment, a method for reducing the high-temperature slurry to the feed temperature of the vacuum filtration system in the production process of purified terephthalic acid that combines the advantages of the above two methods is proposed

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  • Method for reducing temperature of high temperature slurry to vacuum filtering system feeding temperature in refined terephthalic acid production process

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Embodiment Construction

[0024] The following structural drawings and embodiments further illustrate the present invention.

[0025] As shown in Figure 3.

[0026] A method for reducing high-temperature slurry to the feed temperature of a vacuum filtration system during the production of purified terephthalic acid, comprising the following steps:

[0027] a. First, the high-temperature slurry greater than 100°C produced in the previous process is centrifuged and then sent to an atmospheric flash tank for flash cooling, so that the temperature of the slurry is reduced to greater than 100°C and less than 115°C. Flash cooling slurry;

[0028] b. Next, send the above-mentioned flash cooling slurry into a buffer tank and use low-pressure steam injection to vacuumize and cool down, so that the temperature of the flash cooling slurry drops to the feed temperature of the vacuum filtration system.

[0029] The vacuum degree in the above-mentioned buffer tank is 30kPa~70kPa.

[0030] The waste heat generated...

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Abstract

The disclosed method combines the advantages of the flash vaporization cooling method and evacuating cooling method to reduce the temperature of hot slurry to feeding temperature in vacuum filter system. Wherein, adding a buffer tank before the feeding for said system, using flash vaporization to cool the centrifugalized slurry and recover heat energy as device heat source; then, evacuating to cool the slurry to request temperature. This invention saves water and energy and special running cost greatly.

Description

technical field [0001] The present invention relates to a chemical process method, especially a production process method of purified terephthalic acid, specifically a method of reducing high-temperature slurry to the feed temperature of a vacuum filtration system during the production process of purified terephthalic acid method. Background technique [0002] Purified terephthalic acid (PTA) is an important chemical product and one of the main raw materials for polyester (PET) production. With the continuous increase of the world's PET production capacity, the demand for PTA is increasing. Correspondingly, in order to improve market competitiveness and reduce the production cost of PTA, various PTA production enterprises have improved the PTA production process. At present, the commonly used method of producing purified terephthalic acid (PTA) is to oxidize p-xylene to generate crude terephthalic acid (TA) containing a large amount of impurities, and then dissolve the crud...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/00C07C63/26
CPCY02P20/50
Inventor 冒永生陈达吴华志杨怀英
Owner SINOPEC YIZHENG CHEM FIBER
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