Continuous extraction of natural products from plants apparatus and methods

A method of extracting constituents from cannabis plant material, comprising the steps of:

• providing a first and a second reactor assembly, each assembly including a first annular filter element defined by an annular coil of a flat wire providing adjustable filtration apertures to said first annular filter element defining a reaction chamber being disposed radially inwardly of said first annular filter element and a filtrate chamber being disposed radially outwardly of said first annular filter element;
• delivering a stream of cannabis plant solids including a first constituent and a second constituent into said reaction side of said first reactor assembly;
• injecting first extracting fluids being disposed at a first temperature and composition into said reaction side of said first reactor assembly for solubilizing the first constituent of the cannabis plant solids and separating said first constituent from the cannabis plant solids through said first annular filter element into said filtrate chamber of said first reactor assembly;
• transferring residuum disposed in said reaction chamber of said first reactor assembly to said reaction chamber of said second reactor assembly;
• and
• injecting second extracting fluids into a reaction chamber of said second reactor assembly with the residuum, said second extracting fluids being disposed at a second temperature and composition for solubilizing the second constituent of the cannabis plant solids and separating the second constituent through said first annular filter element of said second reactor assembly into said filtrate chamber of said second reactor assembly.