Christie, Parker & Hale
Fractionation of blood plasma
 There is provided in accordance with practice of this invention a process for separating protein fractions from a solution containing proteins and an apparatus for practicing the process. The process and apparatus involve withdrawing from a suspension tank a portion of the suspension contained therein to form a recycle stream. The withdrawn suspension forming the recycle stream contains particles of a selected protein fraction precipitated from a solution containing proteins. Fresh protein solution comprising proteins of the selected protein fraction is mixed into the recycle stream to form a mixed recycle stream. At least a portion of the selected protein fraction proteins in the fresh protein solution precipitate onto previously precipitated selected protein fraction particles suspended in the mixed recycle stream. The mixed recycle stream is introduced back into the suspension tank. A portion of the suspension is withdrawn from the suspension tank in a product stream and precipitated, selected protein fraction particles are recovered from the product stream. 
Alpha Therapeutic Corporation
A C C
A61K C07K C07K
inventional inventional inventional
Chong E.
Chang