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Quality index soft measurement method and device of caprolactam product

A caprolactam, product quality technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of high product extinction, inorganic alkali entrainment, accelerated scaling, etc.

Active Publication Date: 2016-12-21
ZHEJIANG SUPCON SOFTWARE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the acid impurities in the inorganic alkali and the caprolactam raw slurry complete the mixing and chemical reaction in the buffer tank before entering the distillation tower. Due to the lack of effective detection means, it is impossible to obtain real-time product quality information of the caprolactam entering the distillation tower, such as alkali degree, moisture content and acid impurity content
At present, the amount of alkali injection is mainly based on the laboratory analysis results of the quality of caprolactam products, which has a large hysteresis and the amount of alkali injection is not easy to control
Among them, when the amount of alkali injection is too large, the scaling of caprolactam in the subsequent distillation tower will be accelerated, the operation period of the distillation tower will be reduced, and inorganic alkali will be entrained in the caprolactam product at the same time; The acidic impurities in the slurry cannot be completely reacted, which will cause the impurity content in the caprolactam product to be too high, and the product has a high extinction
Due to the improper control of the above-mentioned alkali injection amount, it is easy to cause the quality reduction of caprolactam products

Method used

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  • Quality index soft measurement method and device of caprolactam product
  • Quality index soft measurement method and device of caprolactam product
  • Quality index soft measurement method and device of caprolactam product

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Experimental program
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Effect test

Embodiment 1

[0068] see figure 1 A schematic flow chart of a caprolactam product quality index soft-sensing method provided in Embodiment 1 of the present invention, the method includes:

[0069] S11. According to the dynamic mixing-reaction system of the physical and chemical indicators of caprolactam in the buffer tank, a computerized physico-mathematical model of the physical and chemical indicators of caprolactam is established;

[0070] Wherein, the physical and chemical indicators of the caprolactam include alkalinity, moisture and acid impurities in the dynamic mixing-reaction system of the caprolactam buffer tank before entering the distillation tower;

[0071] Specifically, the caprolactam buffer tank mixing-reaction system is to continuously inject caprolactam stock and inorganic alkali aqueous solution into the caprolactam buffer tank, and the caprolactam stock and inorganic alkali in the buffer tank realize dynamic mixing under the action of the fast mixing pump, and the caprol...

Embodiment 2

[0081] Referring to embodiment one of the present invention and figure 1 The specific process of steps S11 to S13 described in , and see figure 2 Corresponding to Embodiment 2 of the present invention figure 1 The schematic flow chart of establishing a computerized physico-mathematical model in the S11 step can be understood as that the acidic impurities in the caprolactam protoplasm and the inorganic base complete a dynamic mixing-reaction process in the caprolactam buffer tank before the caprolactam unit enters the distillation tower. The mixing-reaction process can be modeled by a virtual continuous full-mixed flow dynamic tank reactor model based on the material conservation equation and reaction kinetic equation. The basicity and moisture of caprolactam in the distillation column are respectively constructed by using the mathematical model of the mechanism. Soft-sensing mechanism mathematical model of caprolactam content and acid impurity content; based on Beer-Lambert ...

Embodiment 3

[0196] Corresponding to the soft-sensing method for the quality index of the caprolactam product disclosed in the first and second embodiments of the present invention, the third embodiment of the present invention also provides a soft-sensing device for the quality index of the caprolactam product, see Figure 5The structural schematic diagram of the caprolactam product quality index soft measuring device provided for the third embodiment of the present invention, the device specifically includes:

[0197] Build module 1, be used for according to the dynamic mixing-reaction mechanism of the physicochemical index of caprolactam in the buffer tank, establish the computer physico-mathematical model of the physicochemical index of described caprolactam;

[0198] Wherein, the physical and chemical indicators of the caprolactam include alkalinity, moisture and acid impurities in the dynamic mixing-reaction system of the caprolactam buffer tank before entering the distillation tower;...

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Abstract

The invention discloses a quality index soft measurement method and device of a caprolactam product. The method comprises the following steps: establishing a computation mechanism mathematic model about physical-chemical indexes of the caprolactam; computing according to the computation mechanism mathematic model to respectively obtain analysis numerical value about the product quality index of the caprolactam entering a distillation tower; performing numerical fitting and online correction on the computation mechanism mathematic model to acquire the corrected soft measurement computation result about the product quality index of the caprolactam entering the distillation tower. After establishing the computation mechanism mathematic model, the physical index and the chemical index of the caprolactam can be computed in real time, and the computation result can be corrected to obtain the soft measurement computation result about the product quality index of the caprolactam, the aim of acquiring the product quality information of the caprolactam entering the distillation tower through real-time computation is realized.

Description

technical field [0001] The invention relates to the technical field of caprolactam production, in particular to a soft measurement method and device for quality indicators of caprolactam products. Background technique [0002] Caprolactam is the main raw material for the production of chemical fibers and engineering plastics. Its products are closely related to the national economy and people's lives. With the rapid development of the national economy and the gradual improvement of people's living standards, the market's requirements for the quality of caprolactam products are gradually increasing. [0003] The main quality indicators of caprolactam products include alkalinity, moisture content and extinction, and the extinction is mainly related to the acid impurities in caprolactam products. In order to improve the quality of caprolactam products, it is necessary to chemically treat the caprolactam raw pulp entering the distillation tower. Generally, a certain concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16C20/10G16C20/70G16C20/80
Inventor 辛传贤黄伟李林任锦飞吴国权江凤月沈旭辉郑信春刘炳杰金晓明
Owner ZHEJIANG SUPCON SOFTWARE
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