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Method for preparing catalyst for hydrogenolysis of biodiesel by-product glycerinum to produce 1,3-propylene glycol

A technology of biodiesel and catalyst, which is applied in the field of environmental chemical industry, can solve the problems of metal/carrier assembly, metal loss, etc., and achieve the effect of realizing waste recycling and low metal loss rate

Active Publication Date: 2016-06-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a catalyst preparation method that can solve the problem of metal loss caused by weak metal / carrier assembly in existing catalysts, and realize the conversion of biodiesel by-product glycerol into 1,3-propanediol

Method used

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  • Method for preparing catalyst for hydrogenolysis of biodiesel by-product glycerinum to produce 1,3-propylene glycol
  • Method for preparing catalyst for hydrogenolysis of biodiesel by-product glycerinum to produce 1,3-propylene glycol
  • Method for preparing catalyst for hydrogenolysis of biodiesel by-product glycerinum to produce 1,3-propylene glycol

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Embodiment １

[0032] (1) Preparation of platinum nanoparticles: a total of 3mL PVP-ethylene glycol solution (0.375mol / L) and 1.3mL chloroplatinic acid-ethylene glycol (6.25×10 -2 mol / L) solution was slowly added to the condensing reflux device. The mixture was continued to reflux at 200°C for 5 minutes. 12.9 mL of acetone was added to the mixture of platinum nanoparticles for centrifugation, and the obtained platinum nanoparticles were redispersed in 8.2 mL of PVP-ethanol solution.

[0033] (2) Assembly of platinum nanoparticles / mesoporous alumina: Dissolve 1.26g triblock copolymer F108 in 30mL ethanol solution containing 0.8mol / L hydrochloric acid and 1.33mol / L glacial acetic acid, and stir the mixture ultrasonically for 15 minutes A homogeneous solution was obtained. Then, 2.46 g of aluminum sec-butoxide and 6.5 mL of the platinum nanoparticle-ethanol solution obtained in step (1) were added to the homogeneous solution, and stirred ultrasonically for 15 minutes to obtain a sol mixture. ...

Embodiment ２

[0036] To the mensuration of catalyst saturated water absorption in embodiment 1: get 5 grams of PtNPs / Al 2 o 3 Catalyst, add deionized water 15mL, let stand for 10 minutes, centrifuge, measure the filtrate volume to be 9.5mL, calculate the saturated water absorption rate of the catalyst to be 1.1mL / g.

Embodiment ３

[0038] Determination of the optimum template stripping temperature in Example 1: Dissolve 1.26g of triblock copolymer F108 in 30mL of ethanol solution containing 0.8mol / L hydrochloric acid and 1.33mol / L glacial acetic acid, and stir the mixture ultrasonically for 15 minutes to obtain homogeneous solution. Then, 2.46 g of aluminum sec-butoxide and 6.5 mL of the platinum nanoparticle-ethanol solution obtained in step (1) were added to the homogeneous solution, and stirred ultrasonically for 15 minutes to obtain a sol mixture. Finally the resulting sol was transferred to a large surface area petri dish. The molar ratio of each substance in the final reaction system is: Pt / F108 / hydrochloric acid / glacial acetic acid / ethanol / aluminum sec-butoxide=0.008 / 0.01 / 2 / 4 / 65 / 1. Alcoholysis of aluminum sec-butoxide and self-assembly of template agent F108 were carried out at a temperature of 40°C, and transferred to an oven at 65°C for 24 hours after 3 hours. Finally, the samples were fired i...

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Abstract

The invention relates to a method for preparing a catalyst for hydrogenolysis of biodiesel by-product glycerinum to produce 1,3-propylene glycol.The catalyst is platinum nano-particles (PtNPs) assembled in a hole channel of mesoporous alumina (mAl2O3) and modified by silicotungstic acid (HSiW), which is abbreviated as PtNPs-HSiW / mAl2O3.The method for preparing the catalyst comprises the steps that the PtNPs are added into an aluminum oxide synthesis system which is in a solvent evaporation induced self-assembly mode, and HSiW modification is conducted.The PtNPs are synthesized through an ethylene glycol reduction method, the solvent evaporation induced self-assembly system mainly comprises a template agent F108, aluminum oxide precursor sec-butyl alcohol aluminum and acid substance, and HSiW modification is conducted through an equivalent-volume impregnation method.By means of the catalyst, glycerinum can produce 1,3-propylene glycol in a hydrogenolysis mode.Due to the special structure that metal platinum in the catalyst is assembled in the carrier hole channel, compared with traditional catalysts, the catalyst has the advantages that the metal loss ratio is lower and the effect is more stable after being reused for multiple times.

Description

technical field [0001] The invention relates to a preparation method of a catalyst used for hydrogenolysis of biodiesel by-product glycerol to produce 1,3-propanediol, belonging to the field of environmental chemical industry. Background technique [0002] With the prominence of the world's energy problems and changes in the energy structure, biodiesel, as a clean and renewable energy, is generally considered by the society to be one of the most promising new energy sources to replace traditional energy, especially in the power field. It can directly replace petrochemical diesel for internal combustion engines. When biodiesel is produced by the transesterification method, various animal oils and vegetable oils are transesterified with alcohols to obtain biodiesel with fatty acid monoalkyl ester as the active ingredient, and a large amount of by-product glycerin is produced at the same time. However, the high production cost in our country has become the biggest obstacle res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652C07C29/60C07C31/20
CPCC07C29/60B01J23/6527B01J35/23B01J35/635B01J35/633C07C31/205Y02P20/52
Inventor 沈峥顾敏燕彭博宇董文杰张亚雷
Owner TONGJI UNIV
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