Abstract: A manner of providing an improved fluid processing arrangement, and bioprocessing in particular, is adapted to agitate the fluid, and also simultaneously provide for the distribution of gas throughout the fluid in order to maintain desirable processing conditions (such as an increased level of dissolved oxygen, in the case of biological applications). In some embodiments, the mixing would be completed without necessitating the use of an external drive motor or the like, such as by using a fluid-driven mixer. Overall, use of the improved arrangement leads to a simplification of the fluid processing operation with improved results and a concomitant reduction in the expense associated with such use.

Abstract: The present invention is a method for producing a water absorbent resin which method is a method for producing surface cross-linked water absorbent resin particles, the method including the successive steps of: (a) adding a surface cross-linking agent and water to a particulate water absorbent resin in a mixer; and (b) reacting the resulting water absorbent resin mixture taken out from the mixer with the surface cross-linking agent in a reactor by heating or active energy ray irradiation, water vapor being used as part or all of the water added in the mixer. This makes it possible to provide a method for producing a water absorbent resin in which method a surface cross-linked water absorbent resin that has excellent properties can be obtained efficiently at low cost with high productivity.

Abstract: A stirrer having a motor; a hollow shaft that is drivable via the motor and is provided with at least one additive outlet opening, via which an additive passed through the hollow shaft can be discharged; and a rotor arranged on the hollow shaft and having rotor blades, characterized in that a second rotor having rotor blades is provided on the hollow shaft at a distance from the first rotor, and in that the at least one additive outlet opening is provided between the two rotors, wherein the rotors are designed and drivable such that, during operation, a negative pressure and a centrifugal force are generated in the intermediate space defined between the rotors.

Abstract: A dynamic mixer comprising a rotor, which is coupled to a drive shaft and which is rotationally mounted in a mixing chamber provided inside a rotor housing; at least one first and one second constituent can be fed to said mixing chamber; the drive shaft comprises at least one wavy channel via which the second constituent can be introduced into the mixing chamber; the mixing device is simplified since the second constituent is fed through the channel provided in the drive shaft; no separate connection for supplying the second constituent is provided on the rotor housing whereby enabling the rotor housing to have a simple design and be economically produced; the assembly and disassembly of parts are also simplified, particularly of the rotor and rotor housing, which can be disposed of or cleaned after the mixer has been used, allowing the dynamic mixer to be repeatedly reused.

Abstract: A mixer assembly comprises a motor, a motor shaft, a propeller connected to the motor shaft and in operation driven by the motor in a first direction of rotation about a propeller axis, the propeller fully submersed in liquid during operation and in rotation generating liquid flow from a suction side to a pressure side of the propeller. Flow control vanes are arranged on the suction side of the propeller, and oriented in an axial plane to deflect the liquid from substantially axial flow into a flow containing a circumferential component of direction which is opposed to the direction of rotation of the propeller. A method for providing axial liquid flow from a mixer propeller that is fully submerged in liquid during operation comprises the steps of applying flow control on the suction side of the mixer propeller through the arrangement of flow control vanes.

Abstract: An apparatus for use in fluid recirculation to, for example, mix oxygen-rich top water and oxygen-poor bottom water in a lake. Specifically, the recirculation apparatus has an enclosure with a wall defining an interior space and a closed end and an open end, the wall having a plurality of openings. Also included is rotating propeller assembly, a flotation device disposed within the interior space and attached to the enclosure, so that the apparatus is buoyant with the open end facing downward; and the openings are configured to be at or near the top surface of the fluid medium. The apparatus may also include a flexible anchoring system and controllers, including the use of oxygen sensors.