TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The triglycerides are derived from beef fat.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Apparatus: Alternatively, an apparatus (A2) for mixing fluids comprising:(a1) an inner concentric member including a first conduit wall defining a first centrally located conduit and a first flange having a flat face around the first conduit; and a second conduit wall defining an annular second centrally located conduit and a second flange having a flat face around the second conduit, where the second flange is in diametric opposition to the first flange, such that the first and second conduits share a common center line and an annular space is formed between the substantially flat faces of the first and second flanges;(b1) an outer concentric member concentrically enclosing the inner concentric member including a third conduit wall around and concentric with the first conduit wall, such that the space between the third conduit wall and the first conduit wall forms a third conduit, and a third flange having a flat face around the third conduit and concentric with the first flange; and a fourth conduit wall around and concentric with the second conduit wall, such that the space between the fourth conduit wall and the second conduit wall forms a fourth conduit, and a fourth flange having a flat face around the fourth conduit and concentric with the second flange, where the fourth flange is in diametric opposition to the second flange, such that the third and fourth conduits share a common center line and an annular space is formed between the flat faces of the third and fourth flanges; and(c1) an outer housing concentrically enclosing the outer concentric member.An further apparatus (A3) for mixing fluids comprises:(a2) an inner concentric member including a first shaft and a first flange having a flat face around the first shaft; and a second shaft and a second flange having a flat face around the second shaft, where the second flange is in diametric opposition to the first flange, such that the first and second shafts share a common center line and an annular space is formed between the flat faces of the first and second flanges;(b2) an outer concentric member arranged concentrically around the inner concentric member including a first conduit wall around and concentric with the first shaft, such that the space between the first conduit wall and the first shaft forms a first conduit, and a third flange having a flat face around the first conduit and concentric with the first flange, where the flat face defines several tapered recesses extending in a radial direction such that a cross section perpendicular to the center line of the tapered recesses defines a portion of a circle; a second conduit wall around and concentric with the second shaft, such that the space between the second conduit wall and the second shaft forms a second conduit, and a fourth flange having a flat face around the second conduit and concentric with the second flange, where the fourth flange is in diametric opposition to the third flange, such that the first and second conduits share a common center line and an annular space is formed between the flat faces of the third and fourth flanges; and several tapered rollers retained in the several tapered recesses defined by the third flange and held against the flat face of the fourth flange, such that the centerline of each tapered roller converges at the center of the annular space between the first and second flanges; and(c2) an outer housing enclosing the outer concentric member.The radial slots have a height of less than 200 microns. The apparatus further comprises a diffusing disc extending over the apertures of the first drive shaft and the apertures of the second drive shaft. The flat face of the first and/or third flange comprises radial ridges and the radial ridges define radial slots between the first and second flange, between the third and fourth flanges, where the radial slots have a height not greater than 200 microns and a width not greater than 200 microns.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The first and second streams are combined in proportionally controlled mass flow rates within the pressurized conduit to provide a pressurized third stream, and the first and/or second streams comprise fluid carbon dioxide (CO2). The first stream comprises fluid CO2. The second stream comprises supercritical ethanol, supercritical methanol and/or supercritical CO2. The second stream is divided into two sections, and the first stream is sandwiched between two sections of the second stream. The conduit has an internal cross-sectional diameter of 100-200 microns. The conduit has an entry end having a circular cross-sectional profile and a low profile section having an elongated cross-sectional profile. The first and second streams flow at equal velocity. The reaction extends for a period not greater than 1 minute (preferably not greater than 20 seconds). The reaction occurs at 200-350degreesC and 2000-3000 psi. The ethanol or methanol is present in excess. The process further involves separating the bio-diesel from the glycerol, carried out continuously in a stream transferred via a hydrocyclone and in a centrifuge. The process further involves separating the residual fluid CO2 from the bio-diesel to provide pure, contaminant free bio-diesel; filtering the separated bio-diesel; and blending the filtered bio-diesel with fossil fuel derived diesel. The mass flow of the first stream is proportional to the mass flow of the second stream. Continuously producing bio-diesel using the apparatus (A1) involves rotating the first and second discs in opposite directions, transferring a first stream containing triglycerides through at least one of the first or second central conduits, and transferring a second stream containing ethanol and/or methanol through the first or second central conduits, whereby the streams contact and react to form bio-diesel and glycerol in the annular space between the first and second discs.