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Design and Preparation of Gas sensor for Binary Gas Mixtures on the Base of Polymeric Membranes

Shabani, Ehsan | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46098 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Musavi, Abbas; Shojaei, Akbar
  7. Abstract:
  8. There are different types of sensors for measuring the concentration of gases that usually have high prices because of their complicated method of production. We can produce much cheaper sensors in special conditions by using polymer membranes. Different gases can be separated by using appropriate polymer membranes and the difference between diffusion rate of these gases is the basis of the separation method and gases pass through the membrane with different flow rates in the specific entrance pressure. The flow rate of total gas which flows will be different for a binary gaseous mixture at specific temperature and pressure with different concentrations because the flow rate is relative to the partial pressures. So the gas concentration can be found by measuring the flow rate. Considering the problems of measuring the flow rate, needle valve can be used and therefore the flow rate which flows through the membrane will be relative to the pressure of the crate and the primary concentration of mixture can be obtained by measuring the pressure of the crate. In this study, in order to measuring the concentration in the mixture of nitrogen and carbon dioxide, at first a design has been made and then the proper membrane has been produced using a membrane with polysulfone base and silicone rubber shield. The considerable point in making membrane for sensor applications is the necessity of its high permeability albeit the selectivity will be low. Then the sensor calibrated for different concentrations and also the effect of changing the conditions including temperature and pressure were studied. The response speed was almost 50 seconds and the tolerance of measuring concentration was approximately 1.4 percent for the produced sensor
  9. Keywords:
  10. Polymer Membrane ; Polysulphone ; Nitrogen ; Carbon Dioxide ; Gas Sensor

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