Method for preparing biodiesel by microwave solid alkali ester exchange method

Abstract

The invention discloses a method for preparing a pyrazine hydroxy ethidene sodium copper bisphosphonate-sodium hydroxide solid base catalyst for preparing biodiesel from soybean oil by a microwave solid alkali ester exchange method. The method is characterized by comprising the following steps of: hydrothermally synthesizing pyrazine hydroxy ethidene sodium copper bisphosphonate by using copper salt, hydroxy ethidene bisphosphonate, sodium hydroxide and pyrazine as raw materials, filtering, drying, grinding, sieving, soaking in sodium hydroxide solution, baking for 3 to 6 hours at the temperature of between 250 and 320 DEG C, and finally obtaining the pyrazine hydroxy ethidene sodium copper bisphosphonate-sodium hydroxide solid base catalyst. The solid catalyst prepared by the method has high catalytic activity, high biodiesel yield can be obtained in the process of preparing the biodiesel by the ester exchange method by using the catalyst and combining a microwave heating technology, and the yield can reach about 94 percent. The method for preparing the biodiesel from the soybean oil is high in reaction speed, simple in operation, low in energy consumption and low in pollution, and has high popularization and application value.

Description

technical field [0001] The invention relates to a method for preparing biodiesel from soybean oil by a microwave transesterification method using copper sodium pyrazine hydroxyethylene diphosphonate-sodium hydroxide solid base catalyst, which belongs to the technical field of biodiesel preparation technology. Background technique [0002] With the depletion of petrochemical energy, the search for green and environmentally friendly renewable energy has become an important strategic direction to achieve sustainable social development. Biodiesel produced from natural animal and vegetable oils derived from biological resources is a typical renewable energy source. Biodiesel is a kind of monoalkyl ester oxygen-containing clean fuel, which has the advantages of renewability, environmental friendliness, good combustion performance, good safety performance, and excellent lubricity. As a form of biomass energy, biodiesel is currently prepared mainly by transesterification, which con...

AI Technical Summary

Problems solved by technology

[0003] The traditional biodiesel production method is basically a method of liquid acid and alkali catalysis. The problem is that the catalyst consumes a lot of liquid acid or alkali, the post-treatment is very complicated, and the production cost is high. In particular, the product must be washed with water.

However, traditional solid base catalysts such as CaO and MgO are easy to separate, but their stability is not high, they cannot withstand acid and water, and may also bring a large amount of industrial wastewater in the post-treatment process, causing environmental pollution.