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On-line continuous detection for concentration of polyvinyl alcohol stock solution

A polyvinyl alcohol and detection method technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of little significance of process guidance and undetectable, etc., and achieve the effects of long service life, convenient maintenance, stable and reliable performance

Inactive Publication Date: 2009-10-28
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with doing this is: the human factor of manual analysis is inevitable; sampling analysis generally takes 30 to 45 minutes, such a large time lag does not have much guiding significance for the process
But unfortunately, the PVA stock solution does not meet this condition: that is, in the case of a large difference in concentration, its density changes very little, and the existing detection methods cannot detect this change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Provide embodiment in conjunction with content of the present invention:

[0018] Set a gas phase pressure measuring point on the upper part of the PVA stock solution preparation kettle, the gas phase pressure measuring point is above the liquid level of the PVA stock solution, the range of the pressure transmitter is 0.15MPa, set the PVA stock solution temperature measuring point in the middle of the PVA stock solution preparation kettle One, the temperature measuring point of the PVA stock solution is below the liquid level of the PVA stock solution.

[0019] The process parameters and other parameters are as follows: the variation range of the PVA stock solution concentration is 12% to 19%; the material temperature variation range is 100°C to 115°C; the pressure variation range is 0.02MPa to 0.09MPa.

[0020] Send the two signals of pressure and temperature measured by the pressure transmitter and PVA stock solution temperature detector to the DCS distributed control...

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PUM

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Abstract

An online continuous detection method for the concentration of polyvinyl alcohol stock solution in the technical field of industrial parameter detection, the steps are as follows: 1) a gas phase pressure measuring point is set on the upper part of the PVA stock solution preparation kettle, and a pressure transmitter is installed there. The range of the transmitter is determined according to the maximum pressure in the PVA stock solution preparation kettle; 2) A liquid phase PVA stock solution temperature transmitter is installed at the lower part of the PVA stock solution preparation kettle, and a temperature transmitter with an appropriate range is selected according to the variation range of the material temperature. 3) by the above-mentioned pressure transmitter, the gas phase pressure in the PVA stock solution preparation kettle is measured, and the temperature transmitter records the boiling temperature of the PVA stock solution, and the above two signals are connected to the distributed control system or intelligent instrument, according to the calculation model That is to obtain the concentration of the PVA stock solution. The invention can obtain the concentration of the PVA stock solution on-line by adopting a conventional instrument, and the method is simple and easy to realize.

Description

technical field [0001] The invention relates to an on-line detection method used in the technical field of detection, in particular to an on-line continuous detection method for the concentration of polyvinyl alcohol stock solution. Background technique [0002] Vinylon industry is a textile raw material production industry that produces vinylon fiber, etc. Its products are widely used in textiles, papermaking, building materials and other departments. Among them, the aqueous solution of polyvinyl alcohol (PVA) is used as the stock solution for spinning, and the spinning process has strict requirements on its concentration variation range, and usually the absolute error is required to be ±0.2%. The preparation process of the polyvinyl alcohol stock solution is: according to the concentration requirements of the PVA stock solution by the process, calculate the required amount of solvent water and PVA (usually PVA contains 20% to 50% moisture), and heat the water to 90 Then a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 王豪
Owner SHANGHAI JIAOTONG UNIV