Method for preparing nano magnetic solid base catalyst used for transesterification reaction

Abstract

The invention provides a method for preparing a nano magnetic solid base catalyst used for transesterification reaction. The method comprises the following steps: 1) preparing water solution from FeSO4.7H2O and Fe2(SO4)3.7H2O according to a molar ratio of 1:2, controlling the total concentration of iron ions to 0.3 mol / L, adding ammonia water into the water solution drop by drop by stirring at the temperature of between 60 and 65 DEG C, drastically stirring the water solution to obtain oil black sediment, aging the water solution for 1 hour, removing the excessive ammonia water in a water bath, repeatedly washing the sediment till the water solution is neutral, detecting the water solution and determining that no SO4 exists; 2) preparing mixed water solution of CaCl2 and a product of the step 1) according to a molar ratio of Ca to Fe ions of 7:1, adding secondary distilled water into the solution, drastically stirring the solution, adding NaOH solution into the solution drop by drop, raising the temperature of the solution to 65 DEG C after the dropping is finished, continuously stirring the solution and aging the solution for 18 hours, attracting magnetic substances by using a neodymium-iron-boron permanent magnet, repeatedly washing a product till the solution is neutral, and drying the product by vacuum; and 3) calcinating the product at 800 DEG C, and converting the product into a composite oxide, namely the nano magnetic solid base catalyst. The method has the advantages of high efficiency for reclaiming the catalyst, simple process, high catalytic activity and efficiency, and reduction of the cost.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a preparation method of a nanometer magnetic solid base catalyst for transesterification. technical background [0002] In today's society, human beings are becoming more and more dependent on energy, but the traditional energy that human beings have relied on for thousands of years is getting less and less. Many large coal mines and oil fields around the world are almost exhausted after a century of overexploitation. Therefore, we must find a new type of energy that can replace traditional energy. Moreover, the disadvantages of traditional energy sources are becoming increasingly prominent. Air pollution is the biggest impact of traditional energy on human life. Every year, deaths caused by air pollution are increasing year by year, and vicious pollution accidents occur frequently. Various sulfur oxides and nitrogen oxides discharged into the air wit...

AI Technical Summary

Problems solved by technology

However, its follow-up treatment process is complex and causes relatively large environmental pollution.

Using a solid base catalyst to catalyze the transesterification reaction has the characteristics of easy separation and simple follow-up process, but due to the small surface area of ​​the solid base catalyst, the contact with the reactants is not sufficient, which reduces the catalytic reaction rate

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