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Method for rapidly detecting alcoholysis degree and polymerization degree in production of polyvinyl alcohol by utilizing near infrared spectrum technology

A technology of near-infrared spectroscopy and polyvinyl alcohol, applied in the field of process analysis, achieves the effects of fast analysis speed, reduction of unplanned products, and simple operation

Inactive Publication Date: 2012-03-28
HUNAN XIANGWEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] But so far, there is no report about the detection of quality and technical indicators such as polyvinyl alcohol (PVA) alcoholysis degree and polymerization degree by near-infrared spectroscopy.

Method used

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  • Method for rapidly detecting alcoholysis degree and polymerization degree in production of polyvinyl alcohol by utilizing near infrared spectrum technology
  • Method for rapidly detecting alcoholysis degree and polymerization degree in production of polyvinyl alcohol by utilizing near infrared spectrum technology
  • Method for rapidly detecting alcoholysis degree and polymerization degree in production of polyvinyl alcohol by utilizing near infrared spectrum technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Instrument conditions and samples:

[0043]Instrument: LUMINAR5030 near-infrared spectrometer produced by BRIMROSE Company in the United States. The main components include optical part, control part, infrared detection probe, optical fiber, power adapter and computer. The wavelength range of the instrument is 1100---2300 nanometers, the wavelength increment is 2 nanometers, the number of scans is 100 times, and the InGaAs detector is used. The software: The Unscrambler chemometric software, Snap spectrum acquisition and processing software.

[0044] Samples: 86 polyvinyl alcohol (PVA) samples, numbered 1-86, polyvinyl alcohol (PVA) alcoholysis degree distribution range 80%-99.9%, polyvinyl alcohol (PVA) polymerization degree distribution range 1500-2500. Among them, 70 are used to establish quantitative analysis models, and 10 to 16 are used to verify positive models. According to the method of GB-12010.5-89, the calibration sample set of polyvinyl alcohol hydrolys...

Embodiment 2

[0063] Application examples of alcoholysis analysis

[0064] Take about 600 grams of polyvinyl alcohol sample, measure the near-infrared spectrum data of the polyvinyl alcohol sample, and import it into the spectral analysis software. The analysis result obtained is that the degree of polyvinyl alcohol hydrolysis is 96.08. The sample was tested according to the specified method, and the analysis result obtained was that the degree of alcoholysis of polyvinyl alcohol was 96.0. The relative deviation is 0.083%.

Embodiment 3

[0066] Take about 600 grams of polyvinyl alcohol sample, measure the near-infrared spectrum data of the polyvinyl alcohol sample, and import it into the spectral analysis software. The analysis result obtained is that the degree of polyvinyl alcohol hydrolysis is 90.65. The sample was tested according to the prescribed method, and the analysis result obtained was that the degree of alcoholysis of polyvinyl alcohol was 90.4. Relative deviation 0.276%,

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Abstract

The invention belongs to the technical field of process analysis, and particularly relates to a method for rapidly detecting the alcoholysis degree and the polymerization degree in the production of polyvinyl alcohol by utilizing near infrared spectrum technology. The method is particularly as follows: according to the principle that a macromolecular compound generates characteristic absorption on near infrared spectrum, utilizing the near infrared spectrum analyzing technology to obtain a near infrared spectrogram of the polyvinyl alcohol (PVA), conducting the analysis process of the near infrared spectrogram, and combining the chemometrics, thus establishing a quantitative calibration model to rapidly and accurately detect the alcoholysis degree and the polymerization degree of the PVA.Infrared detection probes can be installed on a finished material outlet, a polymerization production line and an alcoholysis production line, thus realizing the online detection. In the method, the accuracy is high, a sample does not need to be subjected to pretreatment, the detection speed is rapid, the reagent does not need to be consumed, and the method is convenient, practical and environment-friendly detection technology.

Description

technical field [0001] The invention belongs to the technical field of process analysis (detection), and in particular relates to a method for detecting quality and technical indicators such as polyvinyl alcohol hydrolysis degree and polymerization degree by using a near-infrared spectrum analyzer. Background technique [0002] Polyvinyl alcohol (PVA) is an important water-soluble polymer compound developed in the early 1950s. It is widely used in the production of fibers, and can also be used as chemical fiber fabric slurry, coating, adhesive, emulsifier, papermaking processing aid, etc. The main production process of polyvinyl alcohol (PVA) includes the synthesis and refining of vinyl acetate, the polymerization of vinyl acetate, the alcoholysis of polyvinyl acetate, and the product of alcoholysis of polyvinyl acetate is polyvinyl alcohol (PVA). The degree of alcoholysis and the degree of polymerization are the main quality and technical indicators of polyvinyl alcohol (P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/359
Inventor 曾卫国李自启唐松乔张艳张代荣李泽武李少池张旭辉田仁静黎兵
Owner HUNAN XIANGWEI
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