NOVELTY - Purifying biological feed material involves purifying biological feed material by using a heater and evaporator combination comprising a heater and a series of three evaporators.    USE - The processes are useful for purifying biological feed material; and for producing biofuel or biofuel components. The hydrocarbon fraction is useful as a fuel or as an additive in fuel compositions (all claimed).    ADVANTAGE - The process provides biofuel with acceptable ignition and cold flow properties. When biological feed material is purified, the impurities, such as metals and solids are retained in the concentrate and the condensate retrieved from the evaporation is ready to be fed to the catalytic hydroprocessing reactor. The boiling takes place in a more controlled manner because low boiling light components, i.e. components having boiling point of 150-210 degrees C, suitably 150-170 degrees C, at a normal pressure, do not cause so much carry over, i.e. migrating of the compounds having a boiling point range at the higher end of the above boiling point ranges as well as impurities to the vapor in the subsequent evaporation steps. The light components can be, if desired, returned back to the feed material of biological origin or refined further in another process or sold further as such. The heater and evaporators may be selected in each step in such a way that the yields, capacity and processability are at the highest level, however, taking also into account the overall cost-effectiveness. The material purified is ready to be fed to catalytic hydroprocessing and the hydroprocessing is able to produce fuel components with excellent yields, because the feed material is not wasted in purification but the available feed fraction is maximized. The heavy components generated from the pitch can be avoided in the product fractions. The yield of the purified material from the evaporation is as high as from 80% to 95% and even from 88% to 95%.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a process for producing biofuel or biofuel components, involving purifying biological feed material by using a heater and evaporator combination comprising a heater and a series of three evaporators to obtain purified biological feed material, feeding of the purified biological feed material into a reactor system, which comprises a catalytically active guard bed phase and a catalytically active main reaction phase and where the purified biological feed material is contacted, in at least one catalyst bed of the phases, with a combination of hydrodeoxygenating (HDO) and hydrodewaxing (HDW) catalysts, treating the purified biological feed material catalytically with hydrogen in the reactor system to cause hydrodeoxygenation, isomerization and cracking of feed material components to provide a hydroprocessing product, and recovering at least a fraction of the hydroprocessing product as biofuel or biofuel components; and    (2) fuel having characteristics meeting specification EN 590 diesel and comprising at least one hydrocarbon fraction produced by the process.