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zro 2 Polycrystalline ceramic foam catalyst, its preparation method and its use

A foamed ceramic and catalyst technology, applied in physical/chemical process catalysts, ceramic products, chemical instruments and methods, etc., can solve the problem of inability to completely solve biodiesel acid reduction corrosion, emulsification and waste water pollution, immature process, complex preparation, etc. problems, to achieve the effect of ensuring long service life, avoiding corrosion, and preventing crystal transformation

Active Publication Date: 2020-05-19
KUSN INNOVATION INST OF NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, as long as alkaline substances are used, neither strong nor weak bases can completely solve the problems of corrosion, emulsification and wastewater pollution in the process of deacidification of biodiesel.
Although the load-type solid acid acid reduction process does not have various problems in the traditional alkali washing and neutralization process, its process is still immature, especially there are still many problems that have not been solved, such as component loss, complicated preparation, and low price. higher

Method used

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Examples

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Effect test

preparation example Construction

[0028] The present invention also provides a ZrO 2 The preparation method of polycrystalline foamed ceramic catalyst comprises:

[0029] Step by step ZrOCl 2 •8H 2 O, AlCl 3 and TiCl 4 (N zirconium: N aluminum: N titanium = 5: 2.2 ~ 3.5: 0.2) dissolved in deionized water to make a precipitation mother liquor with a concentration of 20 ~ 40%, and then containing 10 ~ 13g / L template agent (CTAB) and a certain The ethanol solution of concentrated urea (N urea: N zirconium oxychloride=1:1~3:1) is slowly added to the precipitation mother liquor, and at the same time, the mass fraction of 5~10% Y 2 o 3 concentrated nitric acid until the pH is 2-3, heated to 80-100°C under vigorous stirring, and kept for 12-24 hours. After the reaction, adjust the pH to 2-3 with dilute nitric acid, and crystallize at 40-60°C for 6-12 hours. After the crystallization is completed, vacuum filter and wash with deionized water until it does not contain Cl -1 , washed with absolute ethanol for 2 t...

Embodiment 1

[0032] Add biodiesel (acid value 20mg KOH / g) and biodiesel by-product glycerol (content 85%) into a 5L glass reactor at a mass ratio of 3:1, start the stirrer, set the speed at 350rpm / min, and weigh the oil Heavy 0.3% ZrO 2 The polycrystalline foam ceramic catalyst is slowly added into the reaction kettle. Turn on the vacuum pump, wait until the vacuum pressure of the device is stabilized at -0.1MPa, and after stirring evenly, set the temperature of the constant temperature oil bath to 220°C, turn on the low-temperature condensation device, until the temperature of the material in the reactor rises to 220°C, and stabilize the reaction for 6 hours. The catalyst was separated by centrifugation, and the obtained product was allowed to stand and separate into layers. The acid value of the upper methyl ester layer was measured to be 0.3 mg KOH / g, and the esterification rate was 98.5%. The light yellow liquid in the upper layer then enters the vacuum rectification device to separat...

Embodiment 2

[0034] Add biodiesel (acid value 20mg KOH / g) and biodiesel by-product glycerol (content 85%) into a 5L glass reactor at a mass ratio of 4:1, start the stirrer, set the speed at 500rpm / min, and weigh the oil Heavy 1.0% ZrO 2 The polycrystalline foam ceramic catalyst is slowly added into the reaction kettle. Turn on the vacuum pump, wait until the vacuum pressure of the device is stabilized at -0.1MPa, and after stirring evenly, set the temperature of the constant temperature oil bath to 220°C, turn on the low-temperature condensation device, until the temperature of the material in the reactor rises to 220°C, and stabilize the reaction for 6 hours. The catalyst was separated by centrifugation, and the obtained product was allowed to stand and separate into layers. The acid value of the upper methyl ester layer was measured to be 0.1 mg KOH / g, and the esterification rate was 99.5%. The light yellow liquid in the upper layer then enters the vacuum rectification device to separat...

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PUM

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Abstract

The invention discloses a ZrO2 polycrystal foamed ceramic catalyst comprising elements Zr, Al and Ti which are in the molar ratio of 5:(2.2-3.5):0.2. The invention further discloses a preparation method of the ZrO2 polycrystal foamed ceramic catalyst, and ZrOCl2.8H2O, AlCl3 and TiCl4 are utilized to take part in a reaction. The invention further discloses an application of the ZrO2 polycrystal foamed ceramic catalyst, the ZrO2 polycrystal foamed ceramic catalyst is used for catalyzing glycerin esterification to reduce the acid value of biodiesel, and an esterification reaction is carried out by taking the biodiesel as a reaction raw material, ZrO2 polycrystal foamed ceramic as the catalyst and glycerin serving as a byproduct of the biodiesel as an esterifying agent. The ZrO2 polycrystal foamed ceramic catalyst is efficient, clean, green and environment-friendly, and free fatty acid in the biodiesel is converted into fatty glyceride by the esterification reaction of the fatty acid and glycerin serving as the byproduct of the biodiesel, so that the aim of reducing the acid value is achieved.

Description

technical field [0001] The present invention relates to a kind of ZrO 2 The polycrystalline foamed ceramic catalyst, its preparation method and its use belong to the technical field of biomass energy. Background technique [0002] Biodiesel currently produced by esterification and transesterification often contains a certain amount of free fatty acids due to incomplete reactions, process residues, and product hydrolysis. These fatty acids will not only increase engine deposits and aggravate the wear of the fuel injection pump plunger, but also cause carbon deposits in the fuel injection head and combustion chamber, reduce the power of the diesel engine and increase the wear of the cylinder piston assembly. At the same time, free acid will also increase the corrosiveness of fuel oil, cause the emulsification of blended diesel oil and increase the probability of spoilage, which will lead to engine damage due to corrosion of metal components and swelling of rubber pipes. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C04B35/48C04B38/00C10L1/02C11C3/06
CPCY02E50/10
Inventor 刘士涛吴聪萍刘建国邹志刚
Owner KUSN INNOVATION INST OF NANJING UNIV
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