Abstract:
An improved process for recycling a cobalt hydroformylation catalyst from a hydroformylation reaction which comprises feeding a hydroformylation product into a mixing zone, adding water thereto, feeding the mixture of water and hydroformylation product into a settling zone where two phases are formed, the phase containing the cobalt hydroformylation catalyst is recycled into the hydroformylation reaction.
Abstract:
High strength graphite fiber or ribbon and a method for making them are provided involving the extrusion of a mixture of polyacetylene and an organic solvent, subjecting the extrudate to a preliminary heat treatment, and thereafter exposing the heat stabilized extrudate to temperatures up to about 3300*C while in an inert atmosphere and under tension.
Abstract:
A continuous method is provided for making polyacetylene fiber convertible to high strength carbonaceous products. A thin film evaporator is employed to devolatilize the reaction mixture at the termination of the oxidative coupling of diethynyl organo compounds. The concentrated reaction mixture can be spun into polyacetylene fibers in a continuous manner. The spun concentrate can be collected and employed to make graphite fibers useful in making composites.
Abstract:
An improved process for recycling a cobalt hydroformylation catalyst from a hydroformylation reaction which comprises feeding a hydroformylation product into a separation zone wherein two phases are formed, a solvent phase containing the cobalt hydroformylation catalyst and another phase containing the catalyst and a hydroformylation compound; separating the catalyst from the hydroformylation compound in a countercurrent extractor; concentrating the catalyst in an evaporation zone and recycling it into the hydroformylation reaction.