The present invention is directed to a process for feeding a polymerisation catalyst into a polymerisation reactor (7), comprising the steps of: (i) maintaining a catalyst slurry comprising a diluent and a solid catalyst component in a catalyst feed vessel (4); (ii) continuously withdrawing a stream of the catalyst slurry from the catalyst feed vessel (4); and (iii) introducing the withdrawn portion of the catalyst slurry into the polymerisation reactor (7), wherein the catalyst slurry is transferred by using a valveless piston pump (5) from the catalyst feed vessel (4) into the polymerisation reactor (7); the diluent has a dynamic viscosity of from 0.01 to 20 mPas at the conditions within the catalyst feed vessel (4), and wherein the catalyst slurry is transferred along a substantially vertical path downwards from the catalyst feed vessel (4) to the reactor (7).

A mechanism applies necessary forces for the creation of one or more plugs of compressible material to be supplied to a reactor. The plugs are capable of forming a seal between inlets for the plugs and the reactor. The mechanism includes two double-acting hydraulic piston cylinder assemblies coupled with two single-acting hydraulic piston cylinder assemblies.

Control of the flow of granular polysilicon granules is effected by employing an elastomeric pinch sleeve valve. The flow control by this method is especially useful for controlling the flow of silicon seed particles and granular polysilicon product in the fluidized bed method for producing polysilicon. The flow may be stopped without gas leakage, and is suitable for use over long operating campaigns.

A control system for automatic operation of a hydrocracking unit is shown. The control system includes a control device operable to affect at least one of a yield or a product quality of one or more output oil products provided as outputs of the hydrocracking unit. The control system further includes a controller configured to obtain an objective function that quantifies a value of operating the hydrocracking unit as a function of at least one of the yield or the product quality of the one or more output oil products, use a neural network model to generate a target control device setpoint predicted to optimize the objective function when the hydrocracking unit operates at the target control device setpoint, and operate the control device using the target control device setpoint to modulate at least one of the yield or the product quality of the one or more output oil products.

A method and device for transferring solid particles between zones of different pressures is disclosed. A rotating annular disk spans a pressure barrier and comprises a radial piston cylinder connecting the exterior with the interior. A piston is disposed within the radial piston cylinder comprising a proximal end and distal end, the distal end comprising a cam follower. A stationary closed cam device is located within the interior portion comprising an internal cam profile. The cam follower is in contact with the internal cam profile. As the disk rotates, the cam follower tracks the cam profile causing the piston to move rectilinearly through the radial piston cylinder. As the radial piston cylinder aligns with a solids source, the piston retracts, providing a cavity into which the solid particles fall. As the radial piston cylinder aligns with a solids receptacle the piston returns, ejecting the solid particles into the solids receptacle.

Device for metering powder, in particular in clean-rooms, which includes a vessel containing powder and a sealing head with a septum for the vessel, wherein the sealing head is connectable powder-tight with the vessel and the septum powder-tight with the sealing head and the device further includes a vessel holder, which serves to hold the sealing head of the vessel, and the vessel with its opening points downwards, so that the powder can flow out of the vessel, wherein a gap is provided between the sealing head and a holding bowl of the vessel holder, in which a gas flow between the holding bowl and the sealing head can be created. The invention also relates to a use of the device and a metered addition method.

Chemical liquid is injected into a tank. A concentration of a first gas dissolved in the chemical liquid is detected. Based on the detected concentration of the first gas, at least one of the first gas and a second gas is injected into the tank to sustain at least one of the concentration of the first gas and a concentration of the second gas in a range of a target value.

A plant and a process for carrying out the continuous production of fatty alcohol from fatty acid ester by catalytic trickle-bed hydrogenation, comprising shaft reactors each containing at least one catalyst fixed bed, which are connected with each other via pipe conduits such that they can be traversed by the educt/product mixture one after the other, in freely selectable order.

A purge system for a polymerization system may include a purge column including a stripping zone and a stripping fluid distributor below the stripping zone for injecting a stripping fluid including one or more light olefins. A first displacement zone is below the distributor. A second displacement zone is below the first displacement zone. A nitrogen distributor introduces nitrogen in the second displacement zone. Another purge system for a polymerization system may include a fluidized bed separator and a purge column. The fluidized bed separator includes a separator inlet, a stripping fluid inlet, a first stripped fluid outlet, and a separator outlet. The purge column includes a flake inlet, a stripping zone, a stripping fluid distributor below the stripping zone, a stripped flake outlet, and a second stripped fluid outlet for a second stripped fluid from the purge column.

The present invention relates to an insertion device for inserting at least one section of packing for a gas/liquid separation column into a cylindrical casing, characterized in that a deployment module comprises a main member centred about a main axis of the insertion device, and a plurality of peripheral members arranged circumferentially and uniformly around the main axis, each of the peripheral members comprising an attachment means configured to grasp hold of a packing section, the deployment module comprising a plurality of branches arranged as pairs of branches connecting the main member to one of the peripheral members, the deployment module being able to modify the dimension of the insertion device by modifying a radial distance between the main member and each of the peripheral members.