Isobutylene superposition system device transformed from methyl tertiary butyl ether device, and superposition process method

The invention provides an isobutylene superposition system device transformed from a methyl tertiary butyl ether device, and a superposition process method. The isobutylene superposition system devicecomprises a feeding unit, a superposition unit, a catalytic distillation unit and an inhibitor recovery unit. The inhibitor recovery unit is formed by connection of an inhibitor extraction tower andan inhibitor rectification recovery tower, mixed C-4 and inhibitors are pre-reacted in a superposition reactor, the deep superposition reaction is carried out by a catalytic distillation tower, and inhibitor recovery and superposition product extraction are competed through the inhibitor extraction tower and the inhibitor rectification recovery tower, so that the application value of an original methyl tertiary butyl ether preparation system device and a process facility thereof is developed to the greatest extent at the lowest transformation cost, isobutylene component production based on themixed C-4 serving as a raw