Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Combined process for recycling organisms in PTA (Purified Terephthalic acid) refining waste water

A technology for refining wastewater and combining processes, applied in the separation/purification of carboxylic acid compounds, natural water treatment, heating water/sewage treatment, etc., can solve problems such as reduced operability, achieve good extraction effect, reduce water consumption, The effect of high recovery rate

Inactive Publication Date: 2017-06-20
FUZHOU UNIV
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because organic carboxylic acids such as benzoic acid and p-toluic acid have a high boiling point, they exist in solid form at room temperature, but the patent does not point out how to separate organic carboxylic acids such as benzoic acid and p-toluic acid from the extractant, and It is not proposed how to achieve the return of organic carboxylic acid to the oxidation system, making the operability of this technology greatly reduced

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
  • Combined process for recycling organisms in PTA (Purified Terephthalic acid) refining waste water
  • Combined process for recycling organisms in PTA (Purified Terephthalic acid) refining waste water
  • Combined process for recycling organisms in PTA (Purified Terephthalic acid) refining waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The technological process adopted in this embodiment is as follows figure 1 shown.

[0030] PTA refined wastewater S1 (340,000kg / hr) is cooled to 40 degrees after being cooled by a heat exchanger, and mixed with a stream S2 drawn from the organic return pipe of the azeotropic distillation tower. The volume ratio of S2 and S1 is 0.69. After being mixed by a pipeline mixer, S3 is sent to a mixing and stirring tank for single-stage extraction. The residence time of S3 in the mixing and stirring tank is 15min, and then sent to the clarifier for static stratification, and the residence time is 25min. The organic phase S5 from the clarifier is directly returned to the stratifier at the top of the azeotropic distillation column, and the organic matter (organic carboxylic acids such as benzoic acid, p-toluic acid, and terephthalic acid) in the wastewater is refluxed from the organic phase with the water agent The port enters the azeotropic distillation tower, and then these e...

Embodiment 2

[0036] The technological process adopted in this embodiment is as follows figure 2 shown.

[0037] PTA refined wastewater S1 (340000kg / hr) is cooled to 40 degrees after being cooled by a heat exchanger, and enters the extraction tower from the upper feed port, and a stream S2 is drawn from the organic return pipe of the azeotropic distillation tower, and the stream S2 enters the extraction tower In the lower part, the volume ratio of S2 to S1 is 0.69. The theoretical stages of the extraction tower are 3 stages. The organic phase S3 from the top of the extraction tower is directly returned to the stratifier at the top of the azeotropic distillation tower. The reflux port enters the azeotropic rectification tower, and then these extracted organic substances are extracted from the bottom of the azeotropic rectification tower S8 together with acetic acid, and return to the oxidation system.

[0038] The aqueous phase S4 from the bottom of the extraction tower is sent to the so...

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 discloses a combined process for recycling organisms in PTA (Purified Terephthalic acid) refining waste water. The combined process combines an existing azeotropic rectification system in a PTA system with an extraction process. Firstly, by using a water-carrying agent in an acetic acid azeotropic rectification system as an extraction agent for the PTA refining waste water, the organisms (organic carboxylic acids such as a benzoic acid, a p-toluic acid, a terephthalic acid and the like) in the waste water are extracted out. An extraction phase containing the organic carboxylic acid is returned to an azeotropic rectification column, then the organic carboxylic acids are produced from a column reactor of the azeotropic rectification column and are returned to a PTA oxidative system together with acetic acid. A raffinate phase is sent to a solvent recovery tower, and an organic solvent is produced from a tower top so as to implement recover of the organic solvent in the waste water. One part of waste water produced from a column reactor of a solvent recovery tower is sent to a tail gas absorption system of the PTA oxidative system to be used as an absorbent, and the other part of the waste water is sent to a sewage treatment system. The combined process is simple in flow, implements recycling of the organic carboxylic acid and partial recycling of water in the PTA refining waste water, and is low in cost.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a combined process for recovering organic matter in PTA refined waste water. Background technique [0002] Purified terephthalic acid (PTA) is one of the important basic organic chemical raw materials, mainly used in the production of polyester fibers. The production process of PTA uses xylene as raw material, acetic acid as solvent, catalytic oxidation under certain temperature and pressure to generate crude terephthalic acid (TA). Then TA is dissolved in water at high temperature, and impurities such as p-carboxybenzaldehyde are removed through hydrogenation reaction, and then crystallized and filtered many times, and finally dried to obtain the PTA product. During the refining process of TA, a large amount of wastewater will be produced. The wastewater contains organic substances such as benzoic acid, p-toluic acid, p-carboxybenzaldehyde and the product tereph...

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): C07C63/04C07C63/06C07C63/24C07C51/42C07C51/48C07C51/46C02F1/04C02F1/26
CPCC07C51/42C02F1/04C02F1/26C02F2103/36C07C51/46C07C51/48C07C63/04C07C63/06C07C63/24
Inventor 邱挺黄智贤叶长燊李玲王红星王晓达杨金杯杨臣
Owner FUZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com