Automated Heithaus flocculation titrimeter LEFTA

The computer-operated LEFTA instrument is a stability diagnostic tool utilized to quantify the three Heithaus compatibility parameters which estimate the colloidal stability of asphalts and asphalt cross blends, aged asphalt, pyrolyzed asphalt, and heavy oil residuum; the device abides to the ASTM D6703 norm for automated Heithaus titrimetry.

The samples (asphalt, heavy oil or residuum) are dissolved in toluene and titrated with iso-octane or n-heptane at controlled temperatures to determine the flocculation point and calculate the Heithaus compatibility parameters. The relevance of the LEFTA in Hydrocarbon Fluid Analysis arises from the significant influence of compatibility on petroleum physical properties as well as coke formation; a highly undesirable phenomenon that causes fouling in refinery processes.