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Solid-base monolithic catalyst with regular porous channels and preparation method of solid-base monolithic catalyst

An integrated catalyst and solid base technology, applied in chemical instruments and methods, physical/chemical process catalysts, fatty acid esterification, etc., can solve the problems of small catalyst particles and large bed pressure drop, and overcome the bed pressure drop. , reducing requirements, reducing the effect of requirements

Inactive Publication Date: 2011-05-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: Aiming at the problem of large bed pressure drop caused by the small catalyst particles and random state after filling in the existing fixed bed reactor, the present invention Provide a solid base monolithic catalyst with regular channels and a preparation method to ensure the smooth flow of reactants in the catalyst channels, thereby overcoming the bed pressure drop caused by the random flow of liquid, reducing the requirements for catalyst strength, and improving The service life of the catalyst is improved, and the requirements for the pressure bearing capacity of the reactor are reduced at the same time, and the energy consumption of equipment operation is saved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Preparation Example 1 of WDSHC

[0016] Preparation of supported hydrotalcite and hydrotalcite-like solid base: 76.923g Mg (NO 3 ) 2 ·6H 2 O, 75.026gAl (NO 3 ) 3 ·9H 2 O and 70.845gCa (NO 3 ) 2 ·4H 2 O was dissolved in 700 mL of distilled water to obtain solution A. 80gNaOH and 106gNa 2 CO 3 Dissolved in 1000 mL of distilled water to obtain solution B. 65 °C, under vigorous stirring, drop solution A and solution B into 50 mL of water dropwise to ensure that the pH value is between 9 and 10. The resulting gelatinous precipitate settles at 65 °C for 24 hours, and is filtered and washed with water until Neutral, dried, and then calcined at 500°C for 4 hours. After cooling, take 10g powder and 10g KF 2H 2 O mixed and ground to no graininess, and dried to obtain a KF / Ca-Mg-Al HT solid base catalyst, that is, a supported hydrotalcite-like solid base.

[0017] In the same way, supported hydrotalcite and hydrotalcite-like solid bases such as NaF / Ca-Mg-A...

Embodiment 2

[0022] Example 2: Preparation Example 2 of WDSHC

[0023] Preparation of hydrotalcite and hydrotalcite-like: 76.923g Mg (NO 3 ) 2 ·6H 2 O, 75.026gAl (NO 3 ) 3 ·9H 2 O and 70.845gCa (NO 3 ) 2 ·4H 2 O was dissolved in 700 mL of distilled water to obtain solution A. 80gNaOH and 106gNa 2 CO 3 Dissolved in 1000 mL of distilled water to obtain solution B. 65 °C, under vigorous stirring, drop solution A and solution B into 50 mL of water dropwise to ensure that the pH value is between 9 and 10. The resulting gelatinous precipitate settles at 65 °C for 24 hours, and is filtered and washed with water until Neutral and dried to obtain Ca-Mg-Al HT.

[0024] Hydrotalcites and hydrotalcite-like materials such as Mg-Al HT, Ca-Al HT, and Ca-Mg-Zn HT can be prepared by the same method.

[0025] Honeycomb ceramic pretreatment: cut the honeycomb ceramic into the desired shape, immerse it in 5% dilute nitric acid for 12 hours, take it out, rinse it to neutrality, dry it, and bake it...

Embodiment 3

[0029] Example 3: Preparation Example 1 of DSHC

[0030] Preparation of supported hydrotalcite and hydrotalcite-like solid base: 76.923g Mg (NO 3 ) 2 ·6H 2 O, 75.026gAl (NO 3 ) 3 ·9H 2 O and 70.845gCa (NO 3 ) 2 ·4H 2 O was dissolved in 700 mL of distilled water to obtain solution A. 80gNaOH and 106gNa 2 CO 3 Dissolved in 1000 mL of distilled water to obtain solution B. 65 °C, under vigorous stirring, drop solution A and solution B into 50 mL of water dropwise to ensure that the pH value is between 9 and 10. The resulting gelatinous precipitate settles at 65 °C for 24 hours, and is filtered and washed with water until Neutral, dried, and then calcined at 500°C for 4 hours. After cooling, take 10g powder and 10g KF 2H 2 O mixed and ground to no graininess, and dried to obtain a KF / Ca-Mg-Al HT solid base catalyst, that is, a supported hydrotalcite-like solid base.

[0031] In the same way, supported hydrotalcite and hydrotalcite-like solid bases such as NaF / Ca-Mg-Al...

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Abstract

The invention relates to a solid-base monolithic catalyst with regular porous channels and a preparation method of the solid-base monolithic catalyst as well as an application of the solid-base monolithic catalyst in preparing biodiesel continuously. In the solid-base monolithic catalyst, a honeycomb ceramic with regular straight porous channels is taken as a carrier, and load-type hydrotalcite and hydrotalcite-like solid base which have high activities are loaded on the carrier, so that the solid-base monolithic catalyst with the regular porous channels is prepared. By utilizing the solid-base monolithic catalyst with the regular porous channels provided by the invention, the bed pressure drop in a fixed bed reactor can be greatly reduced. The solid-base monolithic catalyst with the regular porous channels can be applied to continuous fixed bed for biodiesel, has the characteristics of high production efficiency and long service life and is friendly on environment, the cost of the equipment is low, and the energy consumption is low.

Description

technical field [0001] The invention relates to a method for preparing a solid base with regular channels for continuous production of biodiesel. Background technique [0002] Biodiesel mainly refers to long-chain fatty acid low-carbon alcohol esters obtained by transesterification of renewable animal and vegetable oils, and is an ideal substitute for petrochemical diesel. [0003] The method currently used in industry to produce biodiesel is mainly homogeneous acid / alkali catalyzed transesterification reaction. This method has large equipment corrosion, complex post-treatment, and produces a large amount of waste water. The solid base catalyst has the advantages of high reactivity, mild reaction conditions, easy separation of products, recyclable use, and little corrosion to equipment. Chinese patent CN 1664072A discloses a method for producing biodiesel by using alkali or alkaline earth metal oxides, supported alkali metals and hydroxide solid bases. The reaction time i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/04B01J27/138C11C3/10
CPCY02E50/10
Inventor 肖国民高李璟徐积武肖洋
Owner SOUTHEAST UNIV
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