PURPOSE: To efficiently obtain 1,1,1,2-tetrafluoroethane by reacting dichlorotetrafluoroethane with hydrogen in the presence of a hydrogenation catalyst prepared by a wet reduction method and containing an element of the group VIII as a main ingredient.
CONSTITUTION: A dichlorotetrafluoroethane raw material is reacted with hydrogen in the presence of a hydrogenation catalyst prepared by wet reduction method and containing an element of the group VII as a main ingredient in a vapor phase at 120-450°C for 2-60sec to provide the title substance. An element of platinum group such as Ru, Rh, Pd or Pt is preferably used from the viewpoint of an acid resistance and hydrogen reducing activity as the catalyst ingredient and active carbon, alumina, zirconia, etc., is preferably used as a carrier. A method dipping the carrier into a solution obtained by dissolving a salt of the above-mentioned element of platinum group in water or organic solvent to impregnate the salt of the above-mentioned element into the carrier, charging a reducing agent (e.g. formalin) thereto and reducing the salt of the above- mentioned element of platinum group can be applicable as the carrying method.
SAMEJIMA SHUNICHI
YOSHITAKE MASARU
TATEMATSU SHIN
Next Patent: PRODUCTION OF 1,1,1,2-TETRAFLUOROETHANE