The invention is directed toward polymerizing or copolymerizing alpha-olefins either alone or in combination with one or more other alpha-olefins in a gas phase reactor having a fluidized bed and a fluidizing medium such that the fluidizing medium entering the reactor comprises a gas and a liquid phase.

Process for polymerizing monomers in fluidized beds

The present invention relates to a process for the production of polymers and copolymers of olefins CH2=CHR, wherein R is a hydrogen atom or an alkyl or aryl radical having a number of carbon atoms of from 1 to 10, comprising at least one (co)polymerization step in the gas phase, in the presence of a highly active catalyst obtained from a titanium compound supported on a magnesium halide in active form and an Al-alkyl compound. The process is characterized by the fact that it is carried out by feeding a small amount compared with the polymer of a compound having at least two groups, same or different, capable of reacting with the alkyl aluminum compound and able to selectively inhibit the reactivity of the polymer particles fine compared to the average granulometric size of the polymer present in the gas phase.

Process for the gas phase polymerization of alpha-olefins

Apparatus and methods are provided for converting methane in a feed stream to acetylene. A hydrocarbon stream is introduced into a supersonic reactor and pyrolyzed to convert at least a portion of the methane to acetylene. The reactor effluent stream may be treated to convert acetylene to another hydrocarbon process.

Methane conversion apparatus and process using a supersonic flow reactor

Electrostatics in gas-solid fluidized beds: A review

Computational fluid dynamics and electrostatic modeling of polymerization fluidized-bed reactors

A process for preparing ethylene/1-octene copolymers using a titanium based catalyst system under defined polymerization conditions.

Preparation of ethylene/1-octene copolymers of very low density in a fluidized bed reactor

A method for olefin polymerization is provided A feed stream comprising more than 01 ppm by volume of oxygen and 03 ppm by volume of water is passed through a first packed bed to selectively remove at least a portion of the oxygen The feed stream is then passed through a second packed bed to selectively remove at least a portion of the water, providing a purified feed stream comprising less than 01 ppm by volume of oxygen and 03 ppm by volume of water Both the first and second packed beds operate at a temperature of from about 0 ~C to about 50 ~C The purified feed stream is then passed to a polymerization reactor

Feed purification at ambient temperature

A continuous gas fluidized bed polymerization process for the production of a polymer from a monomer including continuously passing a gaseous stream comprising the monomer through a fluidized bed reactor in the presence of a catalyst under reactive conditions; withdrawing a polymeric product and a stream comprising unreacted monomer gases; cooling said stream comprising unreacted monomer gases to form a mixture comprising a gas phase and a liquid phase and reintroducing said mixture into said reactor with sufficient additional monomer to replace that monomer polymerized and withdrawn as the product, wherein said liquid phase is vaporized, and wherein the stream comprises an induced condensing agent selected from the group consisting of alkanes, cycloalkanes, and mixtures thereof, the induced condensing agent having a normal boiling point less than 25° C.

Condensing mode operation of gas-phase polymerization reactor

Embodiments disclosed herein generally relate to olefin polymerization catalysts, and more specifically to chromium-based catalysts and methods of use of chromium-based catalysts for the production of polyolefins, and even more specifically to methods for controlling or tailoring the flow index response of chromium-based catalysts through the controlled addition of a reducing agent to the catalysts under controlled mixing conditions.

Modified Chromium-Based Catalysts and Polymerization Processes for Using the Same

A process for reducing sheeting during gas phase polymerization of alpha-olefins utilizing catalysts prone to cause sheeting wherein the gaseous feed stream containing monomer comonomer hydrogen and inert gas is introduced into the reactor through the recycle stream to the reactor at a point prior to cooling the recycle stream.

Process for reducing sheeting during polymerization of alpha-olefins

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