Method for improving accuracy of determining concentration of NMMO in premixed slurry

A pre-mixing and accurate technology, applied in the direction of phase influence characteristic measurement, etc., can solve the problem of low accuracy and achieve the effect of accurate reflection, strong operability, and elimination of subjective factor errors.

Pending Publication Date: 2019-05-21
TIANE CHEM FIBER GROUP CORP BAODING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Solve the problem of low accuracy and improve the accuracy of NMMO concentration determination in premixed porridge

Method used

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  • Method for improving accuracy of determining concentration of NMMO in premixed slurry
  • Method for improving accuracy of determining concentration of NMMO in premixed slurry
  • Method for improving accuracy of determining concentration of NMMO in premixed slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 A method for improving the accuracy of measuring NMMO concentration in premixed porridge

[0026] Include the following steps:

[0027] (1) Sample processing method

[0028] A. Stir

[0029] After the premixed porridge sample is taken back, stir it with a thick glass rod in the same clockwise direction for more than one minute until the color of the sample is uniform;

[0030] B. Put in the sample

[0031] Put the sample into the sample tank of the digital display refractometer, and flatten it with an angle spoon to make the sample fully contact with the mirror surface; if the sample crystallizes, it needs to be heated and dissolved in an oven at 85°C for more than 30 minutes.

[0032] The digital display refractometer is a fully automatic desktop digital display refractometer from Japan, and the model is RX-7000i.

[0033] (2) Evaluation method of experimental results

[0034] 6 measurements for each sample generate 6 data, remove a maximum value and a m...

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PUM

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Abstract

The invention provides a method for improving accuracy of determining concentration of NMMO in premixed slurry, and the method comprises the steps of stirring, sample putting and experimental result evaluation. According to the method, subjective factor errors of inspectors can be eliminated, operability is high, the real numerical value of the premixed slurry in large-scale production is accurately reflected, a digital display refractometer is adopted for automatic digital display constant-temperature control, and single sample detection of a sample is completed within one minute. The precision of the high-temperature visual inspection refractometer is 0.001, the precision of the digital display refractometer is 0.0001, the detection accuracy is improved from about 89% on average to 97%,and the sample detection error is set to be +/-0.2% according to the error of the high-temperature visual inspection refractometer.

Description

technical field [0001] The invention relates to a method for improving the accuracy of measuring NMMO concentration in premixed porridge, and belongs to the technical field of NMMO concentration detection. Background technique [0002] At present, the method for determining the concentration of NMMO in premixed porridge is to use a high-temperature visual refractometer, which has a large human error. Ten samples with different concentrations were prepared, and the results were measured by a high-temperature visual refractometer, and compared with the theoretical values ​​to judge the detection effect. These are only a small part of the large amount of detection data. From the experimental results, it can be seen that the average detection accuracy is about 89%, and large concentration samples are prone to large deviations. [0003] Table 1 Comparative statistical table of concentration determination of laboratory samples by high-temperature visual refractometer [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41
Inventor 闫丽娜路喜英杜树新田玲国志勇赵志德
Owner TIANE CHEM FIBER GROUP CORP BAODING
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