Method for refining terephthalic acid

A nano-carbon fiber and catalyst technology, applied in chemical instruments and methods, sustainable manufacturing/processing, separation/purification of carboxylic acid compounds, etc., to achieve high porosity, increase speed, and reduce investment

Inactive Publication Date: 2009-12-23
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if such catalysts can be fixed inside the reactor, the high pressure drop will be another engineering problem

Method used

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  • Method for refining terephthalic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] TiO 2 Sol preparation

[0053] TiO 2 The sol is produced by the hydrolysis of tetrabutyl titanate, which is a traditional sol-gel preparation method. For the preparation of TiO 2 The sol uses tetrabutyl titanate as the main raw material (the content is 97%, Aldrich), ethanol as the solvent, and nitric acid as the hydrolysis catalyst. A mixed solution containing 5 mol% tetrabutyl titanate, 90 mol% ethanol, 5 mol% deionized water and 0.1 mol% nitric acid was kept stirring at 60° C. for 30 minutes in a magnetic stirrer. Subsequently, the solution was cooled to room temperature, forming a transparent light yellow TiO 2 Sol.

Embodiment 2

[0055] Preparation of carbon nanofiber carrier with foam structure

[0056] The metal nickel foam with a size of Φ10×5mm and an opening diameter of about 0.6mm is pretreated in the following order. First wash in dilute nitric acid solution and distilled water, and dry at 120°C for 60 minutes. The TiO prepared in embodiment 1 is used for the metal nickel foam through pretreatment 2 Sol dip coating. Slowly immerse metal nickel foam into TiO at a speed of 1cm / s 2 sol and removed immediately from the sol at the same speed to avoid excessive attachment of TiO 2 Sol. The dip-coated foam was dried overnight in a 40°C oven. The sol wrapped on the surface of the metallic nickel foam was converted into a gel film during the drying process, and then further transformed into a gel film with mesopores. Subsequently, the dip-coated foam was dried at 100 °C for 30 min and calcined at 500 °C for 2 h to finally form TiO on the foam surface 2 The protective layer. TiO 2 The thickness o...

Embodiment 3

[0061] Preparation of carbon nanofiber supports with monolith or honeycomb structure

[0062] In this example, monolith is used as a substrate for preparing structured carbon nanofibers. The size of the monolith substrate is: thickness 0.17mm, density 0.45g / cm 3 , the hole density is 400 channels / square inch. The substrate is first washed and dried, and then dip-coated with the TiO prepared in Example 1. 2 Sol and other pretreatments. The TiO 2 The sol contains nickel nitrate Ni(NiO 3 ) 2 .6H 2 O.

[0063] Immerse the monolith into TiO at a speed of 1cm / s 2 sol, and removed immediately at the same speed to avoid excessive adhesion of TiO 2 Sol. The dip-coated monolith was dried overnight in a 40°C oven. During the drying process, TiO is formed 2 Gel film, which is further transformed into a mesoporous xerogel film on the monolith surface. Subsequently, the dip-coated monolith was dried at 100 °C for 30 min and calcined at 500 °C for 2 h. After drying and calcinat...

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Abstract

The invention discloses a catalyst using a structuring nano carbon fiber as a carrier and a method for preparing the same. The catalyst can be applied to hydrofinishing in the production process of catalytic refining of terephthalic acid.

Description

technical field [0001] The present invention mainly relates to a method for refining terephthalic acid (PTA). The method provides a novel catalyst and its application in the production of PTA. Background technique [0002] PTA is used as the main raw material for the production of polyester materials, about 65% of PTA is used in this field. The continuous growth of terephthalic acid consumption is mainly due to the continuous expansion of demand for polyethylene terephthalate (PET). PET is mainly used for the production of soft drinks, drinking water packaging bottles (barrels) and other packaging materials. Such as film, etc. [0003] PTA is a bulk chemical product, the global annual output in 2006 was about 28 million tons. According to preliminary estimates, the current growth rate of global PTA demand is about 6.5%, while the demand growth rate in the Asia-Pacific market is as high as 12-14%. [0004] Crude terephthalic acid is produced industrially by oxidation of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/42B01J21/18C07C63/26C07C51/42
CPCY02P20/10
Inventor 朱建军李明时吕亚平
Owner LINDE AG
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