T.en Process Technology, Inc.

Raytheon Engineers & Constructors, Inc.

Douglas S Hubbell

Slawomir A Oleksy

Philippe W Rutten

A method for enhancing the recovery of styrene includes feeding a hot liquid residue stream to a stripping vessel from a styrene monomer purification finishing system. The hot liquid residue stream includes styrene and compounds less volatile than styrene. The method includes introducing a gas to the stripping vessel to strip a portion of the styrene as vapor, generating a vaporized styrene portion, returning the vaporized styrene portion and the gas to the styrene monomer purification finishing system, recovering at least a portion of the vaporized styrene portion into a styrene monomer product, and producing a final liquid residue stream from a bottom of the stripping vessel with a lower concentration of styrene than the hot liquid residue stream feeding the stripping vessel.

Systems and methods for enhancing the recovery of styrene

Improved process and apparatus for purifying paraxylene from mixed C8-aromatic feedstocks are disclosed in which the use of at least two crystallization stages operated at different temperatures in combination with a final product separator improves purity and recovery while reducing capital and energy costs.

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Sudbury, MA, United States of America

Douglas S Hubbell