Celanese International Corporation

Steve R Alexander

Kevin Clair Hanks

Stacey Somerville

Christopher Paul Devlin

David S C Lee

Randal Jendrzey

Justin Dodson

Monty Sinnreich

Wensheng Chen

Methods and systems for producing vinyl acetate may use flammability limit (FL) formulas with improved efficiencies at more than one location in the vinyl acetate production process. Herein, FLs can be used at one or more of four portions of the vinyl acetate production process: the reactor, the process-to-process heat exchangers, the carbon dioxide removal system, and the ethylene recovery system. Such FLs are functions of operating conditions and include at least one interaction term that represents the interrelation of two or more of the operating conditions (e.g., temperature, pressure, and component concentration) on the FL.

Methods and systems of monitoring flammability of various streams during vinyl acetate production

A method for catalytic vapor phase oxidation of methanol to formaldehyde may include: passing a feed stream comprising methanol and oxygen through a layered catalyst bed having a first layer comprising a first silver catalyst particles and a second layer comprising a second silver catalyst particles that are different than the first silver catalyst particles, wherein the feed stream passes through the first layer before the second layer, wherein the first silver catalyst particles has a greater reaction activity for converting methanol and oxygen to formaldehyde; and reacting the methanol and the oxygen in the presence of the catalysts to produce a product stream comprising formaldehyde.

Process for converting methanol to formaldehyde

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Houston, TX, United States of America

Steve R Alexander