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Method for Simultaneous Detection of Solvent and Moisture in Spandex Production Solvent Recovery Systems

A technology for recycling systems and solvents, applied in the field of near-infrared spectroscopy, to achieve the effects of saving time, shortening the detection cycle, and improving quality control efficiency

Active Publication Date: 2017-06-20
ZHEJIANG HUAFENG SPANDEX +1
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  • Claims
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Problems solved by technology

[0005] Simultaneous determination of DMAC and H in spandex DMAC recovery system by near-infrared spectroscopy 2 O content research has not been reported

Method used

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  • Method for Simultaneous Detection of Solvent and Moisture in Spandex Production Solvent Recovery Systems
  • Method for Simultaneous Detection of Solvent and Moisture in Spandex Production Solvent Recovery Systems
  • Method for Simultaneous Detection of Solvent and Moisture in Spandex Production Solvent Recovery Systems

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Embodiment 1

[0035] The near-infrared spectroscopy model establishment and application process of the present invention is as attached figure 1 ,details as follows:

[0036] 1. Instrument conditions and sample handling:

[0037] Instrument: The near-infrared spectrum was collected by the Swiss ABB company MB3600 Fourier transform near-infrared spectrometer, which is equipped with Horizon MB and QA analysis software, quartz liquid cell and InGaAs detector. The spectrum of each sample is obtained by averaging 64 scans. Scanning range is 12000~4000cm -1

[0038] Sample: The sample used in the experiment is the sample collected from one tower feeding and one tower distilling in the refining and recycling system during the spandex production process.

[0039] 2. Sample near infrared spectrum measurement:

[0040] This experiment uses a quartz liquid absorption cell, mix the sample evenly, pour it into the liquid absorption cell, preheat it to 50±0.5℃, put it into the detection cell, and collect the spe...

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Abstract

The invention relates to a method for simultaneously detecting a solvent and moisture in a polyurethane elastic fiber production solvent recovery system. The method comprises the following steps: (1) preparing a series of DMAC and H2O standard solutions of different concentrations, and selecting a sufficient amount of representative calibration set samples; (2) determining a near-infrared spectral spectrogram of the calibration set samples, carrying out spectral pretreatment on a wave band, of 12,000-4000cm<-1>, of the spectrogram, then, respectively correlating with the content of DMAC and H2O in a standard sample, and establishing a DMAC content calibration model and a H2O content calibration model by adopting a partial least square method; (3) determining a near-infrared spectral spectrogram of a sample to be detected, treating the wave band, of 12,000-4000cm<-1>, of the obtained spectrogram by adopting the same pretreatment method as in the step (2), and substituting a light absorbance value, obtained after pretreatment, in the corresponding calibration model obtained in the step (2), thereby obtaining the content of DMAC in the sample to be detected. The method has the advantages that the analysis process is simple and rapid, the interference resistance is strong, the analysis is non-destructive, the sampling quantity is small, and the like.

Description

Technical field [0001] The invention relates to a method for simultaneously detecting DMAC and H in a solvent DMAC recovery system for spandex production 2 The near-infrared spectroscopy method of O content belongs to the field of industrial analysis. Background technique [0002] Spandex (polyurethane) fiber is currently the most elastic synthetic fiber. It has excellent breaking elongation and breaking strength. It is an indispensable special textile fiber for the production of high-end elastic textiles. It has high application value and Good development prospects. DMAC is the most widely used solvent in the production of spandex. The recovery of DMAC can not only reduce production costs, but also benefit environmental protection and sustainable development. DMAC and H 2 O content is an important parameter to characterize the recovery efficiency, so DMAC and H can be determined quickly and accurately 2 O content has become an important technology in the production of spandex. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/359
Inventor 刘珊珊钱锦李晓庆王小华薛士壮费长书朱炫相
Owner ZHEJIANG HUAFENG SPANDEX
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