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Online Performance Test for the Energy Benchmark

Online Performance Test for the Energy Benchmark. By Steve Stultz J.C. Harmon High School Kansas City, KS School District July, 2008.

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Online Performance Test for the Energy Benchmark

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  1. Online Performance Test for the Energy Benchmark By Steve Stultz J.C. Harmon High School Kansas City, KS School District July, 2008 *Created as part of the NSF-funded Research Experiences for Teachers program at the Center for Environmentally Beneficial Catalysis, located at the University of Kansas

  2. Introduction • When scientists make biodiesel they measure something called the acid number. • The acid number is used to determine the level of free fatty acids, processing acids or degradation by-products in the biodiesel. • These acid by-products are not normally found in petroleum-derived diesel.

  3. Why Test for Acid Number? High acid numbers increase the likelihood of: • Fueling system deposits • Corrosion • Engine deposits, particularly in the fuel injectors. • Plugged filters

  4. Scenario Imagine that you’re a scientist You work for Dr. Williams at the University of Kansas Your job is to determine the acid number of biodiesel samples

  5. How Do You Measure Acid Number? With an automatic acid titration machine, of course! • The machine drops small amounts of a base called potassium hydroxide (KOH) into the sample • After each drop, the machine measures the pH • When pH 11 is reached, it stops adding base • The amount of base needed to reach pH 11 indicates how much acid by-products are in the sample • This value is called the acid number

  6. Your Job You will test 6 biodiesel samples. You will compare your results to a standard acid number to determine which sample is the best.

  7. Start Collecting Data Create a data table on a piece of paper to keep track of your information. Your table should include the sample number, the sample description and the resulting acid number in mgKOH/g. You will watch videos to learn about each sample and then collect your own data.

  8. Sample 1 Click on the link below for the contents of sample one. Describe sample 1 on your data table. http://www.teachertube.com/view_video.php?viewkey=965bdbb4234b23d3dbea

  9. Results for Sample 1 The acid # at pH 11 was 0.297mgKOH/g. Record on your data table.

  10. Sample 2 Click on the link below for the contents of sample one. Describe sample 2 on your data table. http://www.teachertube.com/view_video.php?viewkey=2be891d8c90da8431be1

  11. Results Sample 2 The acid # at pH 11 was 0.38mgKOH/g. Record on your Data table.

  12. Sample 3 Click on the link below for the contents of sample one. Describe sample 3 on your data table. http://www.teachertube.com/view_video.php?viewkey=47dba2bc98b9558aa20c

  13. Results for Sample 3 The acid # at pH 11 was 0.119mgKOH/g. Record on your Data table.

  14. Sample 4 Click on the link below for the contents of sample one. Describe sample 4 on your data table. http://www.teachertube.com/view_video.php?viewkey=1c566de8d91cb6fe6ca5

  15. Results for Sample 4 The acid # at pH 11 was 0.097mgKOH/g. Record on your Data table.

  16. Sample 5 Click on the link below for the contents of sample one. Describe sample 5 on your data table. http://www.teachertube.com/view_video.php?viewkey=458e3299ad2a1f4e7c2b

  17. Results for Sample 5 The acid # at pH 11 was 0.097mgKOH/g. Record on your Data table.

  18. Sample 6 Click on the link below for the contents of sample one. Describe sample 6 on your data table. http://www.teachertube.com/view_video.php?viewkey=032281c7367aea1f0d1c

  19. Results for Sample 6 The acid # at pH 11 was 0.103mgKOH/g. Record on your Data table.

  20. Graph Your Data • Create a graph to analyze your results • You must choose the best type of graph for your data • Graph should include sample # verses acid # in mgKOH/g. • Make sure to properly label each axis and title your graph.

  21. Analyze Your Data So, you have just tested the acid number for 6 biodiesel samples. Now you want to determine which sample is the best fuel for an engine.

  22. How do you know which sample is the best? For biodiesel to be safe in an engine, the acid number should be less than 0.5 milligrams of base per gram of sample (0.5 mg KOH/g). The lower the acid number, the better the fuel.

  23. Questions Which sample had the highest acid number? Which sample would most likely increase fueling system deposits? Which sample would be least likely to corrode the fuel injectors? Turn in your graph and questions and answers.

  24. Grading Rubric

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