Abstract: A process for preparing polyolefin in a polymerization loop reactor can include feeding olefin monomer, liquid diluent, polymerization catalyst, optionally hydrogen, and optionally olefin co-monomer into the polymerization loop reactor. The process can include polymerizing the olefin monomer and optionally the olefin co-monomer to produce a polyolefin slurry in the polymerization loop reactor. The polymerization loop reactor can include a plurality of interconnected pipes defining a flow path for the polyolefin slurry. The polymerization loop reactor can include one or more settling legs provided on at least one horizontal part of the interconnected pipes. The circulation velocity of the polyolefin slurry inside at least one horizontal part of the interconnected pipes provided with one or more settling legs can be reduced by at least 20% and at most 60% compared to a circulation velocity inside a remainder of the polymerization loop reactor.

Abstract: A process for preparing polyolefin in a polymerization loop reactor can include feeding olefin monomer, liquid diluent, polymerization catalyst, optionally hydrogen, and optionally olefin co-monomer into the polymerization loop reactor. The process can include polymerizing the olefin monomer and optionally the olefin co-monomer to produce a polyolefin slurry in the polymerization loop reactor. The polymerization loop reactor can include a plurality of interconnected pipes defining a flow path for the polyolefin slurry. The polymerization loop reactor can include one or more settling legs provided on at least one horizontal part of the interconnected pipes. The circulation velocity of the polyolefin slurry inside at least one horizontal part of the interconnected pipes provided with one or more settling legs can be reduced by at least 20% and at most 60% compared to a circulation velocity inside a remainder of the polymerization loop reactor.

Abstract: The invention concerns a semi-continuous method for preparing an emulsion of droplets of a phase A in a phase B, including the following steps: (i) mixing an amount of phase A and an amount of phase B using a multi-shaft mixing system comprising at least one scraping agitator, so as to obtain a dispersion of phase A in phase B with a volume concentration of phase A higher than 74%; (ii) diluting the dispersion obtained in step (i) by adding an additional amount of phase B, and mixing using said multi-shaft mixing system, so as to obtain an emulsion of droplets of a phase A in a phase B.

Abstract: Disclosed is a reactor or sparging vessel suitable for use for reaction mixtures containing vapor and/or gas bubbles. It comprises a mechanical agitation means suitable to redistribute flow radially and at least one perforated plate suitable to provide resistance to axial flow. In desirable embodiments it may include at least one electrically or hydraulically-stimulated rotatable shaft upon which at least one blade impeller is mounted, and at least one perforated plate oriented such that it provides resistance to axial flow. The perforated plate may have channels therethrough whose cross-sectional dimension is smaller than the projected average diameter of the vapor and/or gas bubbles. The reactor or sparging vessel offers improved flow dynamics, including reduced back mixing and narrowed residence time distribution. A method of employing the reactor for a reaction mixture containing vapor and/or gas bubbles is also disclosed. An impeller blade having two curvatures is also disclosed.

Abstract: The invention concerns a semi-continuous method for preparing an emulsion of droplets of a phase A in a phase B, including the following steps: (i) mixing an amount of phase A and an amount of phase B using a multishaft mixing system comprising at least one scraping agitator, so as to obtain a dispersion of phase A in phase B with a volume concentration of phase A higher than 74%; (ii) diluting the dispersion obtained in step (i) by adding a supplementary amount of phase B, and mixing using said multishaft mixing system, so as to obtain an emulsion of droplets of a phase A in a phase B.

Abstract: This document relates to a stable emulsion comprising a continuous phase and a dispersed phase comprising droplets. The droplets are at least partially covered with a powder and the powder comprises particles having an average size which is at least 10 times smaller than the average size of the droplets. A process for preparing the emulsion is also presented.

Abstract: A method for removing heat from a horizontal linear flow reactor, comprising introducing vapor bubbles into a liquid medium in the reactor and removing the vapor from the reactor. A method of producing an elastomer reinforced polymer comprising autorefrigerating the reactants in a horizontal linear flow reactor in which both initial polymerization and phase inversion occur. A method of removing heat from a horizontal plug flow reactor comprising aerating the reactants within the reactor, wherein the aeration promotes radial mixing of the reactants but does not substantially promote axial mixing of the reactants. A horizontal linear flow reactor, comprising a horizontal reaction chamber having one or more mechanical flow facilitators disposed therein and a sparger attached to the bottom of at least a portion of the reaction chamber.

Abstract: Disclosed is a reactor or sparging vessel suitable for use for reaction mixtures containing vapor and/or gas bubbles. It comprises a mechanical agitation means suitable to redistribute flow radially and at least one perforated plate suitable to provide resistance to axial flow. In desirable embodiments it may include at least one electrically or hydraulically-stimulated rotatable shaft upon which at least one blade impeller is mounted, and at least one perforated plate oriented such that it provides resistance to axial flow. The perforated plate may have channels therethrough whose cross-sectional dimension is smaller than the projected average diameter of the vapor and/or gas bubbles. The reactor or sparging vessel offers improved flow dynamics, including reduced back mixing and narrowed residence time distribution. A method of employing the reactor for a reaction mixture containing vapor and/or gas bubbles is also disclosed. An impeller blade having two curvatures is also disclosed.

Abstract: The apparatus (10) is used for determining the consistency index (k) and the power law index (n) of a Newtonian fluid or non-Newtonian power law fluid. A method is also disclosed. Accordingly, the fluid flows in a laminar manner through a first (12) and a second static mixer (14) successively connected together by means of an intermediary pipe (18). A first pressure differential (&Dgr;P1) corresponding to a pressure drop of the fluid through the first static mixer (12) is measured. Similarly, a second pressure differential (&Dgr;P2) corresponding to a pressure drop of the fluid through the second static mixer (14) is measured. Finally, the consistency index (k) and the power law index (n) are calculated using the Metzner and Otto concept generalized to static mixers. The apparent viscosity may also be calculated. This invention may be mounted directly on a main supply pipe (16) and allows the rheological properties of the fluid to be known in real time.

Abstract: The system and the method are used to determine the process viscosity (&mgr;) of a fluid (22) in a film metering device (10) used to form a film (24) to be applied on a substrate (20), such as a paper web or any other suitable flexible materials. The apparent shear rate ({dot over (&ggr;)}) of the fluid, indicative of the flow field, may also be calculated. These parameters are calculated using a pressure profile representing the pressure of the fluid between a transfer roll (12) and a metering rod (30) which controls the thickness of the coating film (24). The torque (T) applied on the metering rod (30) is also measured and taken into account in the calculations. The system and method allow the process viscosity (&mgr;) to be easily and accurately determined during the operation of the film metering device (10) without the need of testing the fluid in an external device and attempting to extrapolate the results to the process.