Resumen

This report outlines as regards an investigation carried out in the University of Ibague, which mainly consists of the analysis of the process of extraction of oil which is obtained from using the extrusion process rice bran. The study analyzes how much oil can be obtained per each kilogram of bran entered to the machine making the process more efficient, and explores the role played by variables of the process such as moisture, temperature and pressure during the extraction. During the investigation, a new electrical system is installed, is added to the steam system and agitation system. 26 trials that allow manipulation of the variables mentioned above are developed through a factorial experimental design. As part of the investigation is also the analysis of moisture, ash, oil content and acidity to the raw matter used. The respective data analysis, is made at the end of the investigation the operating parameters are set from the extruder machine and is accomplished extract content in rice bran oil. Extraction of higher performance is made with bran which entered to the system with a humidity of 8.9% and a temperature of 21.9 ° C. Extrusion speed was 134, 9rpm, that of equal to 15 rpm agitation. The extrusion process was held for 90 minutes and consisted of 3 last bran where screw reached a maximum temperature of 106 ° C. The amount of oil extracted was 6, 1 ml/kg of rice bran extruded without adding solvents.