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Aspen8.4 was used to simulate the reaction of acrolein to produce 1,3-PDO. When attempting hydration, the 3-HPA system could not be found; it was defined manually, but the following problems arose. I seek help from experts to resolve these issues. -> Processing input specifications... Information: Henry components are defined in this case; the binary database will be searched automatically for any available Henry constants. The structure for component C3H4O has not been defined. PCES cannot use group-contribution methods to estimate missing properties; use the “Structures” paragraph to define the structures of this component. The structure for component C2H4O has not been defined either; PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. The structure for component water has not been defined either; PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. The structure for component 3-C3H6O2 has not been defined either; PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. Flowsheet analysis: Calculation order for the flowsheet: B1, B2 -> Calculations begin... Block B1: Model = MIXER; Block B2: Model = RSTOIC. The Henry constant model HENRY1 has missing parameters. Please provide the missing parameters for the major solvents. This error may occur because the stream consists entirely of vapor, yet a VLE calculation is requested. Try specifying VALID-PHASES=VAPOR-ONLY. Henry/1st element (Dataset 1) is missing for the supercritical component C3H4O when combined with all solvents: 3-C3H6O2, C2H4O when combined with all solvents: 3-C3H6O2, water when combined with all solvents: 3-C3H6O2. **** Property parameter error: Errors were encountered in calculating the properties of liquid mixtures using the UNIQUAC option set for PHIMX! Calculations were stopped due to missing property parameters. -> Table generation begins... -> Table generation completed. -> Processing input specifications... Information: Henry components are defined in this case; the binary database will be searched automatically for any available Henry constants. The structure for component C3H4O has not been defined. PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. The structure for component C2H4O has not been defined either; PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. The structure for component water has not been defined either; PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. The structure for component 3-C3H6O2 has not been defined either; PCES cannot use group-contribution methods to estimate missing properties – use the “Structures” paragraph to define its structure. -> Table generation begins... -> Table generation completed. Flowsheet analysis: Calculation order for the flowsheet: B1, B2 -> Calculations begin... Block B1: Model = MIXER; Block B2: Model = RSTOIC. The Henry constant model HENRY1 has missing parameters. Please provide the missing parameters for the major solvents. This error may occur because the stream consists entirely of vapor, yet a VLE calculation is requested. Try specifying VALID-PHASES=VAPOR-ONLY. Henry/1st element (Dataset 1) is missing for the supercritical component C3H4O when combined with all solvents: 3-C3H6O2, C2H4O when combined with all solvents: 3-C3H6O2, water when combined with all solvents: 3-C3H6O2. **** Property parameter error: Errors were encountered in calculating the properties of liquid mixtures using the UNIQUAC option set for PHIMX! Calculations were stopped due to missing property parameters