Invista North America S.a.r.l.

Arteva North America S.a.r.l.

Auriga Polymers, Inc.

Miguel Angel Osornio

Gordon Allen Shaw

Stephan Kretschmer

Stephen Jonathan Freeman

Torsten Schmidt

Lawrence Robert Fike

J&ouml;rg Bartels

Bryan Moore

Yashwant Awasthi

Durgesh Chand Kushwaha

Michael Kowalske

Methods of on-line control of molecular weight in continuous solid state polymerization processes. The solid state polymerization process can be a polyester process or to a polyamide process, and more specifically a poly(ethylene terephthalate) (PET) or a poly(butylene terephthalate) (PBT) or a nylon 6,6 continuous solid-state polymerization (SSP) process. An in-line viscometer melts and measures the molecular weight of the SSP resin and adjusts one or more of the process variables, i.e. reactor time, inert gas purity and inert gas temperature to maintain a constant resin molecular weight.

On-line control of molecular weight in continuous solid state polymerization processes

The present invention relates to a process for producing PET based on titanium catalyst having acceptable properties for resin used in the production of bottles for beverages. More particularly the invention relates to a process in which the incoming pre-polymer temperature is higher than the final outlet temperature in the final melt phase polycondensation reactor.

Polyester polymerization process

A method and apparatus for quenching and scrubbing a hot gas using a liquid in a single packed column while controlling mist formation. Hot gas is introduced at the bottom of the column and drawn upward countercurrent to the scrubbing liquid. The column has three stages, each packed and fed liquid from above. The first stage is a quench region wherein the gas flow rate, liquid flow rate and liquid temperature are controlled such that the quench rate does not exceed 5.4&deg; C./ft,of packing to prevent formation of an aerosol mist. The second and third stages for scrubbing employ packed regions separately supplied with increasingly cooler and purer liquid.

System to quench gasses and remove condensables

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Spartanburg, SC, United States of America

Miguel Angel Osornio