Patent ID: 7763215

Claim:
A reactor comprising: a reactor vessel including a tubesheet and configured to receive a reaction fluid, the tubesheet has a first plate member configured to contact the reaction fluid and a second plate member configured to not contact the reaction fluid; and heat exchange tubes provided in the reactor vessel and fixed to the first plate member, the heat exchange tubes being configured to receive a heat exchange medium, wherein at least a portion of the first plate member configured to contact the reaction fluid is made of a high corrosion-resistant metal that has a higher corrosion-resistance against the reaction fluid, wherein the second plate member is made of a low corrosion-resistant metal that has a lower corrosion-resistance against the reaction fluid, wherein the heat exchange tubes do not pass through the second plate member, and means for detachably assembling the second plate member to a remainder of the reactor vessel including the first plate member.