Composite solid base cao-al2o3 and method for preparing biodiesel from catalyzed waste vegetable oil
A solid base, ca12al14o33 technology, used in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of long catalytic reaction time, unreusable catalysts, and high cost of biodiesel, and achieves good repeated use performance, The effect of low cost and cost reduction
Inactive Publication Date: 2014-10-01
OCEAN UNIV OF CHINA
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Problems solved by technology
[0006] Aiming at the defects of high cost, long catalytic reaction time and non-reusable catalyst for the preparation of biodiesel by solid base heterogeneous catalysis, the purpose of the present invention is to provide a composite solid base CaO-Al 2 o 3 and a method for preparing biodiesel from waste vegetable oil. The present invention not only provides a novel composite solid base catalyst capable of efficiently transforming waste vegetable oil, but also optimizes the catalyst structure and morphology and the purification conditions of waste vegetable oil based on the Process conditions for preparing biodiesel from waste vegetable oil, determine the key factors affecting the conversion of waste vegetable oil, and establish a rapid and low-cost method for preparing biodiesel from waste vegetable oil
Method used
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Embodiment 1
[0030] 1. New CaCO 3 and the preparation of CaO
[0031] Measure 500mL 0.100~2.00mol·L -1 CaCl 2 , add 0.500~3.000g L-glutamic acid, stir to dissolve it, slowly add 0.100~2.00mol·L to 500mL -1 Na 2 CO 3 In the medium, react at 20-80°C for 1-6h, then filter with suction, wash with distilled water and ethanol for 2-3 times, and dry at above 100°C for several hours to obtain CaCO with special mesoporous spherical structure. 3 . CaCO 3 Calcining above 400°C for 1 to 4 hours to obtain CaO with a similar structure.
[0032] 2. Solid base catalyst CaO-Al 2 o 3 preparation of
[0033] (1) Grinding method: 1.529g of Al(OH) 3 respectively with the above prepared CaCO 3 Mix 0.396g, 1.786g, 3.571g, 5.358g, 7.144g, 8.037g, 8.930g, put in a mortar and grind for 10-120min, mix well and calcinate at above 400℃ for 1-5h, cool and place in a desiccator In, get CaO and Al 2 o 3 CaO-Al with mass ratios of 1:4.5, 1:1, 2:1, 3:1, 4:1, 4.5:1, 5:1 2 o 3 solid base catalyst.
[0034]...
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Abstract
The present invention provides a composite solid base CaO-Al2O3 and a method for preparing a biodiesel oil, wherein a mass ratio of CaO to Al2O3 in a catalyst is 4.5:1, and the catalyst has an excellent catalytic activity. The method for preparing a biodiesel oil by catalysis with the CaO-Al2O3 comprises: carrying out a reaction under a certain conditions, wherein a molar ratio of an alcohol to oil is 6:1-12:1, a cosolvent is n-hexane having a weight percentage of 5-80 wt% or a biodiesel oil having a weight percentage of 5-20 wt%, a heating temperature is 60-65 DEG C, an amount of the catalyst is 1-5 wt%; carrying out centrifugate to separate a solid catalyst; and carrying out standing and layering, wherein the upper layer is the biodiesel oil. The preparation method for the biodiesel oil in the present invention has the following advantages that: the yield is more than 98%; the reaction time is shortened to 40-60 minutes; the efficiency is close to the efficiency of a homogeneous catalyst; the catalyst can be reused more than 70 times, and the biodiesel oil yield is more than 98%; and the cost is reduced, and the method has characteristics of rapidness and simple operation, and provides great significances for new energy industry development and environmental protection.
Description
technical field [0001] The invention belongs to the application field of oil chemistry and chemical industry, relates to the field of biodiesel preparation, in particular to a composite solid base CaO-Al 2 o 3 And a method for preparing biodiesel from catalyzed waste vegetable oil. Background technique [0002] In recent years, the depletion of world oil resources and the air pollution caused by oil burning have prompted people to look for new alternative energy sources. Biodiesel is a long-chain fatty acid monoalkyl ester obtained by transesterification with low-carbon alcohols from vegetable oils, animal oils, their processed or used waste, and microbial oils. Its outstanding environmental protection and renewable Sex has attracted great attention from all over the world. The United States, the European Union and Japan have taken the lead in producing and using biodiesel. [0003] Currently, biodiesel has not replaced petrochemical oil because its cost is much higher t...
Claims
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IPC IPC(8): B01J23/02B01J35/10C11C3/10
CPCY02E50/13Y02E50/10
Inventor 张前前禹变变梁生康李苓陆金仁
Owner OCEAN UNIV OF CHINA