Abstract: The objective of the present invention is to provide a method for the highly selective production of dipropylene glycol containing 1,1?-oxybis-2-propanol in a proportion of 0.10 to 0.70 and/or tripropylene glycol containing 1,1?-[(1-methyl-1,2-ethanediyl)bis(oxy)]bis-2-propanol in a proportion of 0.10 to 0.70. The present invention is a method for producing dipropylene glycol containing 1,1?-oxybis-2-propanol in a proportion of 0.10 to 0.70 and/or tripropylene glycol containing 1,1?-[(1-methyl-1,2-ethanediyl)bis(oxy)]bis-2-propanol in a proportion of 0.10 to 0.70, the method comprising a reaction step of making a reactant comprising propylene oxide and water react in the presence of a catalyst, wherein the catalyst comprises at least one element selected from the group consisting of vanadium, niobium, and tantalum, and the Hammett acidity function (H) of the catalyst satisfies H?9.3.

Abstract: There is provided a method for producing dipropylene glycol (DPG) and/or tripropylene glycol (TPG) including: (A) reacting a raw material liquid including propylene oxide and water to obtain a reaction liquid including unreacted water, propylene glycol (PG), DPG and/or TPG, and an alcohol compound excluding PG, DPG, and TPG; (B) separating, from the reaction liquid, a first liquid containing water and the alcohol compound and a second liquid containing the PG, DPG and/or TPG and optionally the alcohol compound; (C) removing a part of the alcohol compound from the first liquid to obtain a third liquid containing water and optionally a part of the alcohol compound; (D) separating, from the second liquid, a fourth liquid containing the PG and optionally the alcohol compound, and a fifth liquid containing the DPG and/or TPG and optionally the alcohol compound; and (E) recycling a part of the third liquid to step (A).

Abstract: There is provided a method for producing dipropylene glycol (DPG) and/or tripropylene glycol (TPG) including: (A) reacting a raw material liquid including propylene oxide and water to obtain a reaction liquid including unreacted water, propylene glycol (PG), DPG and/or TPG, and an alcohol compound excluding PG, DPG, and TPG; (B) separating, from the reaction liquid, a first liquid containing water and the alcohol compound and a second liquid containing the PG, DPG and/or TPG and optionally the alcohol compound; (C) removing a part of the alcohol compound from the first liquid to obtain a third liquid containing water and optionally a part of the alcohol compound; (D) separating, from the second liquid, a fourth liquid containing the PG and optionally the alcohol compound, and a fifth liquid containing the DPG and/or TPG and optionally the alcohol compound; and (E) recycling a part of the third liquid to step (A).

Abstract: The objective of the present invention is to provide a method for the highly selective production of dipropylene glycol containing 1,1?-oxybis-2-propanol in a proportion of 0.10 to 0.70 and/or tripropylene glycol containing 1,1?[(1-methyl-1,2-ethanediyl) bis (oxy)]bis-2-propanol in a proportion of 0.10 to 0.70. The present invention is a method for producing dipropylene glycol containing 1,1?-oxybis-2-propanol in a proportion of 0.10 to 0.70 and/or tripropylene glycol containing 1,1?[(1-methyl-1,2-ethanediyl) bis (oxy)]bis-2-propanol in a proportion of 0.10 to 0.70, the method comprising a reaction step of making a reactant comprising propylene oxide and water react in the presence of a catalyst, wherein the catalyst comprises at least one element selected from the group consisting of vanadium, niobium, and tantalum, and the Hammett acidity function (H) of the catalyst satisfies H?9.3.

Abstract: A method of producing 1-hexene comprising: step 1: a periodic table group IV transition metal compound, an organoaluminum compound and ethylene are brought into contact with each other in a solvent to obtain a solution containing 1-hexene; and step 2: the solution obtained in step 1 is brought into contact with an aqueous solution containing a metal hydroxide and having a pH of 12.0 or higher.

Abstract: The present invention relates to a gas-liquid dispersion device which is used in a column wherein a gas-liquid mixed fluid flows upward which comprises a liquid as a continuous phase and a gas as a dispersed phase, characterized in that the gas is dispersed effectively into the liquid, so that a sufficient contact between the gas and the liquid can be attained. The device is characterized in that (A) the plate has at least one hole through which the gas and the liquid pass, (B) one end of the conduit is connected to the hole at a lower surface of the plate so that the conduit extends downward from the plate, (C) at least one passage for the gas is provided through a side surface of the conduit, and (D) at least one passage for the liquid is provided in a lower part of the conduit.