Title of Invention	"DICARBOXYLIC ACID PRODUCTION WITH ENHANCED ENERGY RECOVERY"
Abstract	The invention provide improved energy content in and shaft power recovery from off-gas from xylene oxidation reactions while at the same time minimizing wastewater treatment cost. More shaft power is produced using off-gas than is required to drive the main air compressor, even with preferred, relatively low oxidation temperatures. Simultaneously, an amount of wastewater greater than byproduct water from oxidation of xylene is kept in vapor form and treated along with off-gas pollutants in a self-sustaining (self-fueling) gas-phase thermal oxidative destruction unit. Optionally, off-gas is combined from multiple xylene oxidation reactors, comprising primary and/or secondary oxidation reactors and forming TPA and/or IPA. Optionally, air compressor condensate and caustic scrubber blowdown are used in a TPA process or as utility water, effectively eliminating normal flow of liquid wastewater effluent from a TPA plant. Optionally, PET off-gas containing the water of PET formation is treated in a shared thermal oxidative destruction unit, effectively eliminating normal flow of liquid wastewater effluent from a combined pX-to-TPA-to-PET plant.

Title of Invention

"DICARBOXYLIC ACID PRODUCTION WITH ENHANCED ENERGY RECOVERY"

Abstract

The invention provide improved energy content in and shaft power recovery from off-gas from xylene oxidation reactions while at the same time minimizing wastewater treatment cost. More shaft power is produced using off-gas than is required to drive the main air compressor, even with preferred, relatively low oxidation temperatures. Simultaneously, an amount of wastewater greater than byproduct water from oxidation of xylene is kept in vapor form and treated along with off-gas pollutants in a self-sustaining (self-fueling) gas-phase thermal oxidative destruction unit. Optionally, off-gas is combined from multiple xylene oxidation reactors, comprising primary and/or secondary oxidation reactors and forming TPA and/or IPA. Optionally, air compressor condensate and caustic scrubber blowdown are used in a TPA process or as utility water, effectively eliminating normal flow of liquid wastewater effluent from a TPA plant. Optionally, PET off-gas containing the water of PET formation is treated in a shared thermal oxidative destruction unit, effectively eliminating normal flow of liquid wastewater effluent from a combined pX-to-TPA-to-PET plant.

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Patent Number

271552

Indian Patent Application Number

3059/DELNP/2011

PG Journal Number

09/2016

Publication Date

26-Feb-2016

Grant Date

25-Feb-2016

Date of Filing

27-Apr-2011

Name of Patentee

GRUPO PETROTEMEX, S.A. DE C.V

Applicant Address

RICARDO MARGAIN NO.444, TORRE SUR, PISO 16, COL. VALLE DEL CAMPESTRE, SAN PEDRO GARZA GARCIA, NUEVO LEON 66265 MEXICO

Inventors:

#	Inventor's Name	Inventor's Address
1	RAYMOND ELBERT FOGLE III	8 WAYLAND COURT, JOHNSON CITY, TN 37604, USA
2	RONALD BUFORD SHEPPARD	1900 ASHFIELD DRIVE, KINGSPORT, TENNESSEE 37664, USA
3	TIMOTHY ALAN UPSHA W	478 OAK FOREST PLACE, KINGSPORT, TENNESSEE 37664, USA
4	ALAN GEORGE WONDERS	155 OAKLAND DRIVE, LONGVIEW, TEXAS 75605, USA

PCT International Classification Number

C07C 51/265

PCT International Application Number

PCT/US09/005764

PCT International Filing date

2009-10-22

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	61/110,248	2008-10-31	U.S.A.
2	12/556,107	2009-09-09	U.S.A.