Determination of melting points, specific heat capacity and enthalpy of catfish visceral oil during the purification process.

摘要

Changes in m.p., enthalpy and specific heat capacity of catfish visceral oil at each step of the purification process were studied. M.p. of -46.2 to 21.2 degrees C for crude oil, -45.9 to 11.5 degrees C for degummed oil, -44.3 to 11.4 degrees C for neutralized oil, -47.1 to 9.9 degrees C for bleached oil and -52.3 to 8.0 degrees C for deodorized oil were observed. Enthalpy (kJ/kg) was 74.1 for crude oil, 74.7 for degummed oil, 75.1 for neutralized oil, 79.3 for bleached oil and 84.3 for deodorized oil. The specific heat capacities at 20 degrees C for crude, degummed, neutralized, bleached and deodorized oils were 1.69, 1.96, 1.97, 1.91 and 1.83 kJ/kg degrees C, respectively.