Unlock instant, AI-driven research and patent intelligence for your innovation.

Power recovery for use in start-up or re-start of a pure terephthalic acid production process

a technology of pta and power recovery, which is applied in the direction of machines/engines, gas turbine plants, steam engine plants, etc., can solve the problems of adding additional complexity to the normal operation of the production process, and additional sources of high-grade heat, so as to improve the overall cost-effectiveness of the pta production process, improve the power and energy recovery system, and add additional complexity

Inactive Publication Date: 2013-10-03
INVISTA NORTH AMERICA R L
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes an improved system for producing polyester terephthalate (PTA) that can save money by improving energy efficiency. The system uses a special type of gas turbine to generate high-quality heat, which is then used to purify the PTA production process. This eliminates the need for separate sources of high-temperature heat and reduces complexity in the production process. In summary, the patent describes a way to make PTA more efficiently and economically.

Problems solved by technology

Improvements have been made to the energy efficiency of the PTA production process, however, the improvements comprise multiple and separate systems, adding additional complexity to the normal operation of the production process.
Further, additional sources of high grade heat are required to start-up the production process or when the oxidation reactor is not in normal operation, such as an unplanned process interruption or stop (“Trip”).

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power recovery for use in start-up or re-start of a pure terephthalic acid production process
  • Power recovery for use in start-up or re-start of a pure terephthalic acid production process
  • Power recovery for use in start-up or re-start of a pure terephthalic acid production process

Examples

Experimental program
Comparison scheme
Effect test

examples

[0058]The following examples further illustrate the various aspects of the disclosed processes and systems. The mass and heat balances have been calculated based on the schematics shown in FIG. 1 for normal operation and FIG. 2 for interrupted operation, but other aspects show similar results.

[0059]Table 1 (below) assumes the use of high pressure (“HP”) steam and shows the relative mass flows, compared to the normal generation of high pressure steam, for the two modes of operation. For normal operation, ambient air is compressed and heated to about 365° C. before flowing to the combustor feed interchanger, where it is cooled, before feeding to the oxidation reactor. The gaseous stream vented from the oxidation reactor flows to a condenser to remove condensables, before the gaseous stream temperature is increased in the combustor feed interchanger and heater. The heated gaseous stream flows to the catalytic combustor, where volatile organics and other gaseous components are combusted...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method and system for recovering power from the gaseous stream produced by a paraxylene-air oxidation reaction. Specifically, the invention is based on heating the gaseous stream from the oxidation reaction to a temperature of at least 600° C., recovering energy through an expander, heating the expander vent stream and recovering heat from the vent stream. The recovered heat is used to maintain the oxidation process, purification process, start-up the process, or re-start the process after an interruption.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of application Ser. No. 12 / 990,984, entitled “Power Recovery”, filed on Dec. 7, 2010, which claims priority to U.S. Provisional Application Ser. No. 61 / 108,233, filed on Oct. 24, 2008, the disclosures of which are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]This invention relates to a method for recovering power from the gaseous stream (“off-gas”) produced by an oxidation reaction, for example the oxidations of para-xylene (pX) to terephthalic acid (TA) and dimethyl terephthalate (DMT) or of cyclohexane to cyclohexanone / cyclohexanol. Specifically disclosed herein is an oxidation reaction system comprising a power recovery system and a method for the recovery of energy as a high grade heat source such as high pressure steam, hot oil or the like, for use in starting, running or re-starting a PTA production process.BACKGROUND OF THE INVENTION[0003]Many industrial synthetic chemical p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F01K21/04
CPCF01K21/047F01K23/10F01K23/064
Inventor CARRICK, HARALD B.AIRD, GRAHAMHUMPHRIES, GRAEME
Owner INVISTA NORTH AMERICA R L
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com