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Crude terephthalic acid hydrorefining catalyst and preparation method thereof

A crude terephthalic acid, hydrorefining technology, applied in chemical instruments and methods, preparation of carboxylates, preparation of organic compounds, etc., can solve problems such as poor thermal stability of catalysts

Active Publication Date: 2017-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is the problem of poor thermal stability of catalysts in the prior art, and a new catalyst for hydrogenation of crude terephthalic acid is provided, which is used for hydrogenation of crude terephthalic acid Refining reaction, with the characteristics of high heat resistance and stability of palladium

Method used

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  • Crude terephthalic acid hydrorefining catalyst and preparation method thereof
  • Crude terephthalic acid hydrorefining catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 50 grams of 4-8 mesh, flaky coconut shell activated carbon (specific surface is 1100m 2 / g, pore volume is 0.52ml / g) soaked in 3wt% sodium carbonate aqueous solution, the ratio of the volume of sodium carbonate aqueous solution and activated carbon volume is 3:1, soaking time is 30min, then dry to obtain carrier precursor I; The above-mentioned carrier precursor I was processed in a microwave oven with an output power of 1000W and a frequency of 2450MHz for 5min to obtain a carrier precursor II; then the carrier precursor II was soaked in water, the volume of which was 3 times the volume of the carrier precursor II, and then The power is 200W, and the frequency is 40KHz in an ultrasonic instrument for 30 minutes, and then washed with water until the washing liquid becomes neutral, and the catalyst carrier is obtained after drying.

[0030] Preparation of palladium impregnating solution: take 1.25 grams of palladium-containing 20wt% chloropalladic acid aqueous solu...

Embodiment 2

[0034] Weigh 50 grams of 4-8 mesh, flaky coconut shell activated carbon (specific surface is 1100m 2 / g, pore volume is 0.52ml / g) soaked in 3wt% sodium carbonate aqueous solution, the ratio of the volume of sodium carbonate aqueous solution and activated carbon volume is 3:1, soaking time is 30min, then dry to obtain carrier precursor I; The above-mentioned carrier precursor I was processed in a microwave oven with an output power of 1000W and a frequency of 2450MHz for 10 minutes to obtain a carrier precursor II; then the carrier precursor II was soaked in water, and the volume of water was 3 times the volume of the carrier precursor II, and then in The power is 200W, and the frequency is 40KHz in an ultrasonic instrument for 30 minutes, then washed with water until the washing liquid becomes neutral, and the catalyst carrier is obtained after drying.

[0035] Preparation of palladium impregnating solution: take 1.25 grams of palladium-containing 20wt% chloropalladic acid aqu...

Embodiment 3

[0039] Weigh 50 grams of 4-8 mesh, flaky coconut shell activated carbon (specific surface is 1100m 2 / g, pore volume is 0.52ml / g) soaked in 3wt% sodium carbonate aqueous solution, the ratio of the volume of sodium carbonate aqueous solution and activated carbon volume is 3:1, soaking time is 30min, then dry to obtain carrier precursor I; The above-mentioned carrier precursor I was processed in a microwave oven with an output power of 1000W and a frequency of 2450MHz for 15min to obtain a carrier precursor II; then the carrier precursor II was soaked in water, and the volume of water was three times the volume of the carrier precursor II, and then The power is 200W, and the frequency is 40KHz in an ultrasonic instrument for 30 minutes, then washed with water until the washing liquid becomes neutral, and the catalyst carrier is obtained after drying.

[0040] Preparation of palladium impregnating solution: take 1.25 grams of palladium-containing 20wt% chloropalladic acid aqueous...

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Abstract

The present invention relates to a crude terephthalic acid hydrogenation refining catalyst and a preparation method thereof, which mainly solves the problem of poor thermal stability of the catalyst in the prior art. The present invention adopts a crude terephthalic acid hydrogenation refining catalyst, and the catalyst includes Carrier and active component, described active component is palladium, and the mass percent composition of palladium is 0.2~1.0% of catalyst dry weight, it is characterized in that described carrier is the technical scheme of activated carbon after microwave treatment and ultrasonic treatment, The technical problem is better solved, and it can be used in the production of crude terephthalic acid hydrogenation refining.

Description

technical field [0001] The present invention relates to crude terephthalic acid hydrogenation refining catalyst and its preparation method. Background technique [0002] Purified terephthalic acid, commonly known as PTA, is the basic raw material for the synthesis of polyethylene terephthalate (PET). The supported palladium / carbon catalyst is suitable for the purification of crude terephthalic acid. After the impurities such as p-carboxybenzaldehyde (4-CBA) in crude terephthalic acid are hydrogenated and converted into other compounds, the method of crystallization is subsequently adopted. to separate and purify. Since the palladium / carbon catalyst adopts a single active component, the distribution of metal palladium on the carrier has a great influence on the performance of the catalyst. [0003] Since the reaction process of terephthalic acid hydrofining is a first-order reaction, the reaction speed is fast, and it is difficult for the reactants to penetrate into the int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44C07C63/26C07C51/487
CPCY02P20/52
Inventor 肖忠斌畅延青
Owner CHINA PETROLEUM & CHEM CORP