EVAPORATION APPARATUS, METHOD OF EVAPORATION AND PROCESS FOR PRODUCING METHACROLEIN OR (METH)ACRYLIC ACID

摘要

An evaporation apparatus adapted to evaporate a portion of a liquid material containing two or more types of components for use in exothermic vapor-phase catalytic reaction and feeding the same to a reactor for the vapor-phase catalytic reaction. The evaporation apparatus comprises a can body provided at its apical part with a vapor exhaust port; an evaporation section for heating the liquid material inside and/or outside the can body to thereby evaporate the same; a column section consisting of a column containing trays and/or packing material, connected at its column bottom to the vapor exhaust port; a liquid supply tube for supply of the liquid material, provided at the middle or higher position of the column section; a vapor exhaust tube for exhausting the vapor from the apical part of the column section and feeding the same to the reactor for vapor-phase catalytic reaction; and a liquid discharge tube for discharging the liquid material lying in the can body.