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Vegetable Oil Dilution of Diesel Engine Lubricating Oil by Chance

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Vegetable Oil Dilution of Diesel Engine Lubricating Oil by Chance Vegetable oil dilution of diesel engine lubricating oil by Chance Rewolinski A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Chemical Engineering Montana State University © Copyright by Chance Rewolinski (1985) Abstract: The lubricating oil environment of a diesel engine operated on vegetable oil fuel was simulated on a laboratory scale to study effects of system parameters on lubricating oil degradation, primarily excessive viscosity increase. Initial parameters investigated for effect on viscosity increase were temperature, vegetable oil dilution level, catalyst level, and gas flow rate. Viscosity increased more rapidly for higher temperature and higher concentration of vegetable oil. Higher catalyst level accelerated the rate of viscosity increase, with copper showing a much higher catalytic activity than iron. Oxygen was required to obtain a viscosity increase, with higher oxygen flow rates slightly increasing rate of viscosity rise. Mechanisms of acid and free radical catalysis of polymerization yielding viscosity increase were investigated. Relationship of amount of free acids in the oil to increase in viscosity was investigated by measuring total base number of contaminated lubricating oil. Amount of free acid was varied by addition of phosphoric acid, octadecylamine, and a commercial lubricating oil total base number enhancer. None of these approaches had any significant effect on viscosity increase, indicating that drop in total base number and viscosity increase are not causally related. Free radical catalysis was investigated by periodic additions of a commercial free radical polymerization initiator to samples of contaminated lubricating oil. Viscosity response from this additive was similar in form and magnitude to that from oxygen, indicating that viscosity increase of contaminated lubricating oil is due to a free radical mechanism. A single sulfur compound was employed to limit the copper catalyst action by poisoning. A single chelating agent was used to sequester and limit the action of solubilized catalyst. Neither of these approaches reduced the viscosity increase of contaminated lubricating oil. Degraded lubricating oil samples were tested for lubricity by use of a four-ball wear tester. Lubricity of contaminated, degraded lubricating oil was superior in all eases to uncontaminated, degraded lubricating oil. VEGETABLE OIL DILUTION OF DIESEL ENGINE LUBRICATING OIL by Chance Rewolinski A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Chemical Engineering MONTANA STATE UNIVERSITY Bozeman, Montana July 1985 V37* CL-cL APPROVAL of a thesis submitted by Chance Rewolinski This thesis has been read by each member of the thesis committee and has been found to be satisfactory regarding content, English usage, format, citation, bibliographic style, and consistency, and is ready for submission to the College of Graduate Studies. Date ^ Chairperson, Graduatevommittee Approved for the Major Department If msL Dat sad, Major Department Approved for the College of Graduate Studies Date Graduate Dean m STATEMENT OF PERMISSION TO USE In presenting this thesis in partial fulfillment of the requirements for a master’s degree at Montana State University, I agree that the Library shall make it available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Permission for extensive quotation from or reproduction of this thesis may be granted by my major professor, or in his absence, by the Dean of Libraries when, in the opinion of either, the proposed use of the material is for scholarly purposes. Any copying or use of the material in this thesis for financial gain shall not be allowed without my permission. Signature_______------------------$ltUAjzsJLt^.a.A^.------- iv TABLE OF CONTENTS Page APPROVAL.......................... ii ACKNOWLEDGMENTS. ............................................................... iii TABLE OF CONTENTS..................................................................................................... iv LIST OF TABLES.................................,............................................................................. vi LIST OF FIGURES.............................. viii ABSTRACT........................................................................................................................ x INTRODUCTION................................................ I General Considerations............................................■............................................. I Economic Considerations.........•............................................,................... , ......... 2 Technical Problems ......................................................... : ................................................... 3 PREVIOUS RESEARCH...................._........................ ...................................................... 7 RESEARCH OBJECTIVE....................: ............................................................................ 14 MATERIALS AND METHODS........., ................., ................... ....................................... 15 Materials........................................................................................................................ 15 Equipm ent.................................................................................................................... 15 Experimental Procedure.............................................................................................. 20 RESULTS AND DISCUSSION.............................................. 22 Effect of System Variables on Viscosity..................................... 22 Effect of System Variables on Total Base Number.................................................. 30 Acid Catalysis................................................................................................................ 34 Free Radical Catalysis.................................................................................................. 46 Sulfur Compounds ....;........................................................................................... 49 Chelating Agent............................................................................................................. 51 Wear Preventative Properties..................................................... 51 CONCLUSIONS ................................................ 55 RECOMMENDATIONS FOR FUTURE RESEARCH 57 V TABLE OF CONTENTS-Continued Page BIBLIOGRAPHY............................................................... 58 APPENDICES............................................................................ 62 Appendix A-Engine Manufacturer’s Association Screening T e s t.......................... 63 Appendix B-Tables of Results and Run Conditions................................................ 65 vi LIST OF TABLES Appendix Tables Page 1. Run I Conditions..................................................................................................... 66 2. Run I Results........................................................................................................... 66 3. Run 2 Conditions..................................................................................................... '66 4. Run 2 Results................................................ 67 5. Run 3 Conditions..................................................................................................... 67 6. Run 3 Results..................................................................................... 67 7. Run 4 Conditions..................................................................................................... 68 8. Run 4 Results........................................................................................................... 68 9. Run 5 Conditions........................................................................................... 68 10. Run 5 Results................................................................................................ ,.......... 69 11. Run 6 Conditions............................................................................. 69 12. Run 6 Results........................................................................................................... 69 13. Run 6 Results........................................................................................................... 70 14. Run 7 Conditions......................................................... 70 15. Run 7 Results....................................................................: ..................................... 70 16. Run 7 Results........................................................................................................... 71 17. Run 8 Conditions.................................................. 71 18. Run 8 Additive A m ounts....................................................................................... 71 19. Run 8 Results............................................................. ..................... .....:.......... 72 20. Run 8 Results................. 72 21. Run 9 Conditions................................................................................. ^................. 72 Vii Appendix Tables Page 22. Run 9 Additive A m ounts................................................ ' ..................................... 73 23. Run 9 Results..................................................................................
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