Patent DE-102009045767-A1 (DE)
Title: Method for commissioning process for purified separation of acrylic acid crystals from suspension of its crystals in mother liquor with device having hydraulic washing column that has process chamber limited by a cylindrical lateral wall
Inventor: HEILEK JOERG
IPC: C07C57/07
Filed: 2009-10-16
Abstract: The method for commissioning a process for purified separation of acrylic acid crystals from a suspension of its crystals in mother liquor with a device having a hydraulic washing column that has a process chamber rotationally symmetrical to its longitudinal axis running from top to bottom, is claimed. The process chamber is limited by a cylindrical lateral wall (28) and two ends opposite to each other to the symmetrical axis. Several filter tubes extend through the process chamber from the upper end of the process chamber parallel to its longitudinal axis. The method for commissioning a process for purified separation of acrylic acid crystals from a suspension of its crystals in mother liquor with a device having a hydraulic washing column that has a process chamber rotationally symmetrical to its longitudinal axis running from top to bottom, is claimed. The process chamber is limited by a cylindrical lateral wall (28) and two ends opposite to each other to the symmetrical axis. Several filter tubes extend through the process chamber from the upper end of the process chamber parallel to its longitudinal axis, taper to the lower end of the process chamber opposite to the upper end and have a filter in the half of the process chamber turned to the lower end of the process chamber and are led outside of the process chamber from the washing column, where the filter forms a direct connection between an interior of the filter tube and the process chamber. The quotient of the distance between the upper and lower ends of the process chamber and the diameter of the process chamber is = 2, where the distance is 3 m. The washing column connects itself at the lower end of the process chamber and is downwardly aligned to a crystal melting chamber, where a rotatable discharging device (16) is integrated between the process chamber and the crystal melting chamber and a crystal melting circuit (31) is guided through the crystal melting chamber. The crystal melting circuit comprises a first conveyor pump (11), a first conveyor connector, a second conveyor connector and a heat exchanger, which are present outside of the crystal melting circuit. The first conveyor pump is present outside of the washing column and has a suction side and a pressurized side. The first conveyor connector guides the washing column from the crystal melting circuit to the suction side of the first conveyor pump. The second conveyor connector reguides the washing column from the pressurized side of the first conveyor pump into the crystal melting circuit and has an outlet from the crystal melting circuit with regulatable discharge. The first conveyor connector from the crystal melting circuit to the suction side of the first conveyor pump or the second conveyor connector from the pressurized side of the first conveyor pump into the crystal melting circuit is guided over the heat exchanger. A distribution chamber is upwardly mounted to the upper end of the process chamber and is separated from the process chamber bay a base, which has passages that guide into the distribution chamber at the side of the base turned to the process chamber and at the side of the base turned away from the process chamber. A second conveyor pump (12) having a suction side and a pressurized side and a source of suspension are present outside of the washing column. An independent claim is included for a process for purified separation of acrylic acid crystals from a suspension of its crystals in mother liquor with a device hydraulic washing column connects to the commissioning process.