Patent ID: 7811524

Claim:
A multi-tubular reaction apparatus comprising: a shell, a plurality of reaction tubes provided in the shell and filled with a catalyst; a heat medium that circulates in the shell; and a cooling apparatus provided outside the shell, the cooling apparatus comprising, a primary cooler to cool at least a part of the heat medium taken outside the shell; a secondary cooler to cool at least a part of the primarily cooled heat medium; a flow control mechanism to divert a first fraction of the heat medium taken outside the shell into the secondary cooler and to by pass a second fraction of the heat medium taken outside the shell around the secondary cooler; and a return line connected to an output of the primary cooler and an output of the secondary cooler for enabling the secondarily cooled heat medium and a residual part of the primarily cooled heat medium, which is not secondarily cooled, to circulate in the shell.