Patent ID: 8043583

Claim:
A shell-and-tube reactor or heat exchanger comprising: a doughnut-shaped baffle plate, a first disc-shaped baffle plate, the doughnut-shaped baffle plate and the first disc-shaped baffle plate being alternately disposed in a vertical direction of the reactor or heat exchanger, a second disc-shaped baffle plate, which is placed in an empty space inside of the doughnut-shaped baffle plate, and tubes, through an inside of which a first object for heat transfer with a heat transfer medium is passed, and which are present in a region inside of the doughnut-shaped baffle plate and outside of the second disc-shaped baffle plate, wherein a diameter D 1 of the second disc-shape baffle plate is in a range of 10-20% of an inner diameter D 4 of a shell of the reactor or heat exchanger.