Measuring water vapor in hydrocarbons

A hydrocarbon, water vapor technology, used in measurement devices, optical radiation measurement, color/spectral property measurement, etc., to solve problems such as sensor uselessness, delay in wetting and drying, damage, etc.

Inactive Publication Date: 2009-06-17
SPECTRASENSORS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] [0008] With alumina and silica sensors, water molecules take time to enter and exit the pores, causing delayed wetting and drying, especially during and after exposure to high moisture
Contaminants and corrosion will damage and block the air holes, causing loss of calibration and rendering the sensor permanently useless

Method used

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  • Measuring water vapor in hydrocarbons
  • Measuring water vapor in hydrocarbons
  • Measuring water vapor in hydrocarbons

Examples

Experimental program
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Embodiment

[0104] [0065] Using the techniques and spectrometer described herein, yield Figure 13 The curve shown for water vapor in ethylene at a partial pressure of 500 mBar, Figure 14 The curve shown for water vapor in propylene at a partial pressure of 250 mBar, and Figure 15 Curve shown for water vapor in isobutane at a partial pressure of 300 mBar. For each example shown, use the same figure 2 The structure of the sample chamber shown is similar to that of a single sample chamber. A tuned laser operating at approximately 2735 nm provides the incident light. The laser pulse cycle period was approximately 263 milliseconds, and the temperature of the spectrometer was controlled by placing the spectrometer in a thermally controlled cabinet maintained above 30°C with an accuracy of approximately ±0.1°C.

[0105] [0066] The results of these examples demonstrate that ≤ 500 ppb H in gas mixtures containing olefins 2 Renewable amount of O. For ethylene, an absorption chamber with a...

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Abstract

Low concentrations of water vapor within a background of one or more hydrocarbon gases may be detected and quantified using a differential absorption spectrometer. A dehydrated sample of the gas is used as a background sample whose absorption spectrum allows elimination of absorption features not due to water vapor in the gas. Absorption spectra may recorded using tunable diode lasers as the light source, these lasers may have a wavelength bandwidth that is narrower than the water vapor absorption feature used for the differential absorption spectral analysis.

Description

[0001] related application [0002] [0001] This patent application is required under 35 U.S.C. § 119 Act, serial number No. 60 / 793,404 filed April 19, 2006, entitled "MEASUREMENT OFMOISTURE IN OLEFIN GASES" ("Moisture Measurement in Olefin Gases") Priority to the U.S. Provisional Patent Application for , which is hereby incorporated by reference in its entirety. technical field [0003] [0002] The subject matter disclosed herein relates to the measurement of water vapor in hydrocarbon gas mixtures. Background technique [0004] [0003] Currently available techniques for characterizing water vapor in hydrocarbon gas mixtures suffer from various drawbacks. For example, the constant maintenance and corrections required in this field make it cumbersome and expensive to use. In addition, these techniques can be difficult to calibrate, drift over time, generally do not provide fast response and short recovery times, and can lead to indeterminate and erroneous measurements. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/39
CPCG01N21/031G01J3/02G01N21/0332G01N33/22G01N21/39G01J3/42G01N33/0036G01J3/027G01N21/3554G01N21/3504G01J3/4338
Inventor X·周
Owner SPECTRASENSORS INC
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