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Online detection for trace moisture of anhydrous hydrogen fluoride

A technology of anhydrous hydrogen fluoride and trace water, which is applied in measuring devices, instruments, and material analysis through electromagnetic means, etc., can solve the problem of large error in the moisture content of anhydrous hydrogen fluoride, difficulty in online determination, and no trace of anhydrous hydrogen fluoride has been found On-line detection of moisture and other issues to achieve the effect of shortening the production cycle and reducing production costs

Inactive Publication Date: 2016-07-20
广东金光高科股份有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The Karl Fischer method for determining the moisture content in anhydrous hydrogen fluoride has a large error, and it is difficult to achieve online determination
The detection of trace moisture in products generally adopts the conductometric method, but so far, no online detection of trace moisture in the production process of anhydrous hydrogen fluoride has been found.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] In the anhydrous hydrogen fluoride water removal production line, the water content of the anhydrous hydrogen fluoride used for water removal is 260ppm. The test temperature of the flow conductivity cell is 0°C. First close the bypass test line and start the water removal cycle production line. After 3 hours, close the production line and start the test line. After half an hour, read the test data of the conductivity meter continuously. After obtaining stable data, close the bypass test line and start the production line. Continue to work. After 3 hours, repeat the last test procedure and record the data. Repeat three times in total. The test data is calculated on the standard curve of anhydrous hydrogen fluoride moisture content drawn at a temperature of 0°C. The moisture content They are 92.3PPM, 45.7PPM and 46.5PPM respectively.

Embodiment 2

[0010] In the anhydrous hydrogen fluoride water removal production line, the moisture content of the anhydrous hydrogen fluoride used for water removal is 395ppm. The operation of Example 1 was completely repeated, and the moisture content was respectively 122.8PPM, 47.3PPM and 44.9PPM after three measurements.

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PUM

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Abstract

The invention relates to the online detection for trace moisture of anhydrous hydrogen fluoride. A flowing conductive battery used for detecting trace moisture according to a conductive method is composed of a stainless steel shell with an interlayer, a polytetrafluoroethylene liner, a platinum electrode, a seal ring and a valve; the flowing conductive battery is in parallel connection with an anhydrous hydrogen fluoride dewatering production line in a form of bypass; the temperature of the flowing conductive battery is controlled to be 0 DEG C; in a detection process, a tee joint is turned to the bypass and a conductivity meter is used for recording and calculating test data; the flowing conductive battery has the characteristics of capability of realizing the online detection for trace moisture of anhydrous hydrogen fluoride, safety, accuracy and reliability.

Description

Technical field [0001] The invention relates to the inspection of inorganic fluorine chemical products, more specifically to the determination of trace moisture in anhydrous hydrogen fluoride products. Background technique [0002] Anhydrous hydrogen fluoride has strong corrosiveness, strong toxicity, strong reactivity, and strong hydrophilicity, so the determination of trace moisture in anhydrous hydrogen fluoride products is very difficult, especially the online detection is even more difficult. At present, anhydrous hydrogen fluoride at home and abroad There are generally two methods for the determination of trace moisture, namely the conductometric method and the Karl Fischer method. The Karl Fischer method for determining the moisture content in anhydrous hydrogen fluoride has a large error, and it is difficult to achieve online determination. The detection of trace moisture in products generally adopts the conductometric method, but so far, no online detection of trac...

Claims

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Application Information

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IPC IPC(8): G01N27/04
CPCG01N27/048
Inventor 李铁军李思洋陈剑锋林晓忠
Owner 广东金光高科股份有限公司
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