Abstract:
A process for the continuous polymerization of monomer, the process comprising (a) adding monomer and catalyst to an annulus within an annular reactor to form a polymerization medium within the annulus, where the annulus includes the space between an outer casing wall and an inner tubular wall, (b) allowing the polymerization medium a sufficient residence time within the annulus to provide a living polymer product, and (c) removing the polymer product from the annulus.
Abstract:
This invention relates to a process of integrated system formed by coupling of fixed bed, jetting floating bed, and separating unit, aimed to provide a new process and equipment of higher efficiency, which integrates multi-type reactors and separation. In this invention, reaction materials will undergo preliminary reaction in fixed bed reactor and intensified reaction in jetting floating bed reactor, and then separation in the subsequent separation system. Unreacted materials will be returned to the raw material intermediate storage tank for mixing with fresh materials, as raw materials for continued reaction. During this process, materials first pass the fixed bed reactor once to achieve certain conversion rate, and then enter the jetting floating bed reactor for intensified reaction. When the product reaches required concentration, the materials will enter subsequent separation equipment for separation. During the whole process, fixed bed reactor, jetting floating bed reactor, and subsequent separation system are coupled, so that the flow path is more integrated, reaction time is greatly shortened, and process energy consumption is further lowered.
Abstract:
The invention relates to a reactor system and process for the catalytic polymerization of olefin monomer and optionally comonomer(s), comprising one or more inlets for olefin monomer, catalyst, optionally for comonomer, chain growth controllers or chain transfer agents, and/or inert gas, an outlet for gas and an outlet for polymerized particles, which reactor system comprises at least one fluidized bed unit and at least one moving bed unit, wherein the fluidized bed unit comprises means for maintaining a fluidized bed in the fluidized bed unit and wherein the moving bed unit is provided with an inlet and an outlet which are connected to the fluidized bed unit, wherein the outlet of the moving bed unit is provided with means for displacing metered quantities of polymerized particles from the moving bed unit into the fluidized bed unit, and to the use of such reactor system.
Abstract:
The number of small gels that form in polyolefin thin films may be reduced by altering certain production parameters of the polyolefin. In some instances, the number of small gels may be influenced by the melt index of the polyolefin. However, in many instances, melt index is a critical part of the polyolefin product specification and, therefore, is not manipulated. Two parameters that may be manipulated to mitigate small gel count while maintaining the melt index are polyolefin residence time in the reactor and ICA concentration in the reactor.
Abstract:
The present invention relates to a process for the chemical treatment of polymers comprising the following steps: i) providing a polymer P); ii) introducing the polymer P) into a spouted bed mixer; iii) keeping the polymer P) within the spouted bed mixer such that the mean residence time τ of the polymer P) in the spouted bed mixer is at least 1 minute; iv) optionally, contacting the polymer P) with a chemical substance B) in the spouted bed mixer during step iii); v) withdrawing the polymer from the spouted bed mixer whereby a chemical substance A) is added to the polymer P) during the course of steps i) to iii) or, in case step iv) is present during the course of steps i) to iv). The present invention furthermore relates to a spouted bed mixer for the chemical treatment of polymers comprising feeding means for feeding polymer to the spouted bed mixer whereby the feeding means are equipped with means for contacting the polymer with a chemical substance A) prior to feeding to the spouted bed mixer. The present invention furthermore, relates to the use of a spouted bed mixer in the production of high melt strength polypropylene and to a polymer obtainable by the process according to the invention.
Abstract:
Provided is a reformate hydrotreatment method, the method comprising: under liquid phase hydrotreatment conditions, bringing the reformate and a catalyst having a catalytic hydrogenation effect into contact in a hydrogenation reactor, the hydrogen used in the hydrotreating process at least partially coming from the hydrogen dissolved in the reformate. According to the method of the present invention, the reformate separated from a reformate products separating tank can directly undergo liquid phase hydrotreatment; therefore not only can the hydrogen dissolved in the reformate be fully utilized, but the olefins in the reformate can also be removed, while eliminate the requirements for recycle hydrogen and a recycle device thereof. The reformate obtained by the method of the present invention reduces the bromine index to below 50 mgBr 2 /100g, and has an arene loss of less than 0.5wt%.
Abstract:
This invention relates to a process of integrated system formed by coupling of fixed bed, jetting floating bed, and separating unit, aimed to provide a new process and equipment of higher efficiency, which integrates multi-type reactors and separation. In this invention, reaction materials will undergo preliminary reaction in fixed bed reactor and intensified reaction in jetting floating bed reactor, and then separation in the subsequent separation system. Unreacted materials will be returned to the raw material intermediate storage tank for mixing with fresh materials, as raw materials for continued reaction. During this process, materials first pass the fixed bed reactor once to achieve certain conversion rate, and then enter the jetting floating bed reactor for intensified reaction. When the product reaches required concentration, the materials will enter subsequent separation equipment for separation. During the whole process, fixed bed reactor, jetting floating bed reactor, and subsequent separation system are coupled, so that the flow path is more integrated, reaction time is greatly shortened, and process energy consumption is further lowered.
Abstract:
A process for polymerizing olefins at temperatures of from 30°C to 140°C and pressures of from 1.0 MPa to 10 MPa in the presence of a polymerization catalyst in a multistage polymerization of olefins in at least two serially connected gas-phase polymerization reactors, the process for transferring polyolefin particles from a first gas-phase polymerization reactor to a second gas-phase polymerization reactor comprising the steps of a) discharging polyolefin particles from the first gas-phase polymerization reactor into a separation chamber in which the polyolefin particles are separated from concomitantly discharged reaction gas, the separation chamber being at a lower pressure than the pressure in the first gas-phase polymerization reactor; b) transferring the polyolefin particles within the separation chamber into a lower part of the separation chamber which contains a bed of polyolefin particles which moves from top to bottom of this part of the separation chamber and into which a fluid is introduced in an amount that an upward stream of the fluid in the bed of polyolefin particles above the fluid introduction point is induced, c) withdrawing polyolefin particles from the lower end of said lower part and transferring them to one of at least two lock hoppers working intermittently in parallel; and d) simultaneously pressurizing another of the at least two lock hoppers working intermittently by means of a gas comprising reaction gas coming from the second gas-phase polymerization reactor, and apparatus for the multistage polymerization of olefins, comprising at least two serially connected gas-phase polymerization reactors and a device for transferring polyolefin particles from an upstream gas-phase polymerization reactor to a downstream gas-phase polymerization reactor, the transferring device comprising - a gas/solid separation chamber placed downstream of the upstream gas-phase polymerization which gas/solid separation chamber is equipped at a lower part with an inlet for introducing a fluid, and - connected to the gas/solid separation chamber at least two lock hoppers, placed in a parallel arrangement, each connected to the downstream gas-phase polymerization reactor.
Abstract:
The invention relates to a catalytic reactor including a chamber (1) and separation means (2) arranged inside the chamber (1), said separation means defining at least one reaction area (3) and at least one regeneration area (4), the reaction area (3) being supplied by a reaction flow supply device (15, 16) and connected, at the outlet thereof, to a first gas tapping device (13), the regeneration area (4) being supplied by a regeneration flow supply device (17) and connected, at the outlet thereof, to a second gas tapping device (10), the reactor being suitable for comprising a fluidized bed of catalyst particles (5) in the reaction area (3), the separation means (2) being suitable for enabling the catalyst particles to pass from the reaction area (3) to the regeneration area (4), and the reactor being suitable for comprising a device for feeding catalyst particles into the regeneration area (4), thereby enabling the return thereof to the reaction area (3).