Patent ID: 8168152

Claim:
A method for producing trichlorosilane by cooling a reaction gas and recovering trichlorosilane, the method comprising: a reaction gas producing step in which silicon tetrachloride and hydrogen, as raw material, are subject to a conversion reaction at a temperature of equal to or higher than 1000° C. and equal to or lower than 1900° C., to produce a reaction gas containing trichlorosilane, dichlorosilylene, hydrogen chloride and high-order silane compounds; a cooling step 1 A in which the reaction gas discharged from the conversion furnace after the reaction gas producing step is cooled to 600° C. or higher within 0.01 seconds from the initiation of cooling and to 500° C. or lower within 2 seconds; an intermediate reaction step in which said reaction gas discharged after the first cooling step 1 A is maintained in a temperature range of equal to or higher than 500° C. and equal to or lower than 950° C. for a time period of equal to or longer than 0.01 seconds and equal to or shorter than 5 seconds; and a second cooling step in which said reaction gas discharged after the intermediate reaction step is cooled to below 500° C.