Dow Global Technolgoies LLC

Irfan Khan

William Hoy Heath

Shrikant Dhodapkar

John G Pendergast, Jr

Paul Aaron Gillis

Quan Yuan

Carlos M Villa

Anna Forlin

Maria Pollard

Matthias Schaefer

Nima N Nikbin

Artur Klinger

Maria Jose Nieves Remacha

Martin Lopez

John G Pendergast

A devolatilizer (devo), which operates at a temperature (T) and at a pressure (P), for the separation of at least a portion of a solvent from a polymer-rich solution comprising the solvent and a polymer, and wherein the devolatilizer comprises at least the following components:

Devolatilizer design

A process for preparing an isocyanate product includes providing a phosgene inlet stream and an amine in solvent inlet stream to a phosgenation mixer, the amine in-solvent inlet stream including one or more amines and one or more inert solvents, and during steady state operation compensating for a fouling pressure drop increase by decreasing a pressure drop in the phosgenation mixer over a time period divided into at least a first period of time Tand a second period of time Tthat is subsequent to the first period of time T. During the second period of time Tan amine concentration of the one or more amines in the amine-in-solvent stream is higher than during the first period of time T, and during the second period of time Ta phosgene-to-amine ratio value in the phosgenation mixer is higher than during the first period of time T

Process for preparing isocyanates

Alkylene oxides are polymerized in a tubular reactor. The alkylene oxide is continuously introduced into the tubular reactor through multiple introduction points located along the length of the tubular reactor. Monomer flow rates are increased along the length of the reactor to maintain a nearly constant concentration of unreacted alkylene oxide.

Alkoxylation process using tubular reactor

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Houston, TX, United States of America

Irfan Khan