NOVELTY - Removal of boron-containing contaminant(s) from composition (1) comprising trichlorosilane to form purified product (5) comprising trichlorosilane involves partially removing boron-containing contaminant from composition, feeding partially purified composition having trichlorosilane into purification column through side inlet port and removing top boron-containing contaminant stream through top outlet port, bottom boron-containing contaminant stream through bottom outlet port and purified composition comprising trichlorosilane through side outlet port from purification column.    USE - Removal of boron-containing contaminant from composition containing trichlorosilane used in manufacture of polycrystalline silicon for solar and semiconductor industries.    ADVANTAGE - The method efficiently and effectively enables removal of boron-containing contaminant from composition containing trichlorosilane.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for system for removing boron-containing contaminant(s) from composition comprising trichlorosilane to form purified product comprising trichlorosilane, which has purification device(s) having inlet port to receive composition and outlet port to remove partially purified composition comprising trichlorosilane, and purification column having side inlet port to receive the partially purified composition, top outlet port and bottom outlet port to remove boron- containing contaminant stream, and side outlet port to remove purified composition comprising trichlorosilane. The side inlet port of the purification column is fluidly connected to outlet port of purification device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the system for removing boron-containing contaminant(s) from composition comprising trichlorosilane.    Composition comprising trichlorosilane (1)    Partially purified compositions (1B,2S,3S)    Boron-containing contaminant streams (1T,2T,3T,5T)    Treated composition (4)    Purified product (5)    Columns (10,20,30,50)    Upper inlet port (11)    Bottom outlet ports (12,22,32,52)    Top outlet ports (13,23,33,53)    Side inlet ports (21,31,51)    Side outlet ports (24,34,54)    Treatment container (40)