Intelligent control method of PTA particle size in fine terephthalic acid production device

A technology of intelligent control and particle size, applied in the method of granulating raw materials, preparation of carboxylate, chemical instruments and methods, etc., can solve problems such as affecting product quality, slowness, and inability to measure particle size online.

Inactive Publication Date: 2005-03-09
SINOPEC YANGZI PETROCHEM
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Problems solved by technology

[0007] In the PTA production process, as far as the current existing technology is concerned, the particle size cannot be measured online. Usually, the mixed samples collected at multiple points are manually analyzed once a day.
Due to the large analysis lag in manual analysis, when the particle size of PTA changes, it is often impossible...

Method used

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  • Intelligent control method of PTA particle size in fine terephthalic acid production device
  • Intelligent control method of PTA particle size in fine terephthalic acid production device
  • Intelligent control method of PTA particle size in fine terephthalic acid production device

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and by embodiment the present invention will be further described:

[0031] According to the load flow and temperature of the hydrogenation reactor, the temperature and liquid level of the first crystallizer, the temperature and liquid level of the second crystallizer, and the particle size analysis value at the previous moment, through a computer system (such as a DCS system or a real-time database) , to obtain the load flow and temperature value of the hydrogenation reactor one hour before the current moment, the temperature and liquid level value of the first crystallizer half an hour before the current moment, and the temperature and liquid level value of the second crystallizer at the current moment.

[0032] Through historical data records, select 100 sets of data of the above variables, use equation (1) to obtain the input data of the neural network soft sensor system, and perform normalization processing, and use the...

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Abstract

An intelligent method for controlling the granularity of PTA particles in refined terephthalic acid (PTA) production includes such steps as selecting the temp and discharge flow of hydrogenating reactor, and the liquid levels and temp of the first and the second crystallizers and using them as the input variables of the soft measuring system of granularity, creating the affection relation of primary operating parameters to PTA granularity, real-time continuous acquisition of procedure data as the soft measured values, determining the difference between settings and measured values, and automatically controlling the liquid levels and temp of the first and the second crystallizers.

Description

1. Technical field [0001] The invention belongs to the field of chemical engineering and automatic control, and relates to an intelligent control method for the particle size of PTA products in the production of purified terephthalic acid (hereinafter referred to as PTA, namely Pure Terephthalic Acid). 2. Background technology [0002] PTA is an important raw material for the production of polyester (PET). Since the production of PET mostly adopts the direct esterification and polycondensation process of PTA, many factors related to the quality of PTA products (such as crystal particle size, impurity content, etc.) The preparation and transportation of PTA slurry have great influence. Secondly, according to the MIRES crystallization theory and the introduction of relevant technical data, one of the particle size indicators of PTA products - the increase of the average particle size is beneficial to the stability and slurryability of PTA slurry. As the use of polyester becom...

Claims

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Application Information

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IPC IPC(8): B01J2/00C07C51/255C07C51/487C07C63/26
Inventor 钱锋邢建良杜文莉王振新颜学峰乔一新王建平
Owner SINOPEC YANGZI PETROCHEM
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