Method for producing 1,3-butadiene

    公开(公告)号:US11479518B2

    公开(公告)日:2022-10-25

    申请号:US17623077

    申请日:2020-07-06

    IPC分类号: C07C1/20 C07C7/06

    摘要: The method of the present invention for producing 1,3-butadiene includes: vaporizing an ethanol feedstock in a vaporizer (104), supplying the feedstock to two or more parallel first reactors (108) to convert ethanol into acetaldehyde in the presence of a first catalyst; supplying a resulting intermediate gas to a second reactor (110) to convert ethanol and acetaldehyde into 1,3-butadiene in the presence of a second catalyst; purifying a resulting crude gas containing 1,3-butadiene by a gas-liquid separator (112), a first distillation column (114), a fourth reactor (116), and a second distillation column (118); and supplying an oxygen-containing gas to at least one of the two or more parallel first reactors (108) under specific conditions, while discharging a carbon dioxide-containing gas from the first reactor (108), to thereby regenerate the first catalyst, while continuing the conversion reaction.

    Method for decomposing byproducts in phenol production process

    公开(公告)号:US11407694B2

    公开(公告)日:2022-08-09

    申请号:US16478802

    申请日:2018-08-17

    申请人: LG CHEM, LTD.

    IPC分类号: C07C1/20 C07C37/52 C07C45/82

    摘要: In a process of decomposing byproducts of a phenol production process using a reactive distillation column in which a reactor and a distillation column are integrated, since acetophenone is mixed with tar recovered to a lower part of the reactive distillation column and transferred, viscosity of the tar may be lowered so that the tar may be transferred at room temperature, and since the reactive distillation column may be operated at 0.5 to 3 bar, an operating temperature of the reactive distillation column is low as compared with a method of separating acetophenone by pressurization with high pressure, significantly reducing an operation cost of a heater required for a reaction. Also, since acetophenone is separately recovered at a position of 25 to 90% of a total number of stages in the reactive distillation column, recovery of an active ingredient may be enhanced.