Preparation method for biological diesel oil

Abstract

The invention discloses a method for the biological diesel oil preparation by using anion exchange resin catalyzing vegetable oil, and the method is characterized in that catalyst is packaged in small packets to be filled into a trickle bed reactor to form a catalyst bed layer, methanol steam is accessed into the bottom part of the trickle bed, after the catalyst bed layer is heated to be 65 to 100 DEG C, vegetable oil is accessed from the top part of the trickle bed, and the residence time of the vegetable oil in the trickle bed is controlled for 100 to 300 min, thereby biological diesel oil is obtained through performing distillation reseparation on the reaction product obtained. The invention adopts gas-liquid mass transfer, and the mass transfer effect is good, thereby the working procedure of continuous blending and the energy consumption needed in the traditional method can be avoided; the invention adopts the anion exchange resin catalyzing vegetable oil as the catalyst, thereby avoiding the subsequent working procedures of catalyst separating, etc., and simultaneously avoiding a great amount of waste water generated when the basic catalyst is neutralized; the anion exchange resin can be reused, and the cost is reduced; the invention adopts the trickle bed reactor to produce the biological diesel oil, and is suitable for the continuous and large scaled production.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and renewable energy, in particular to a method for preparing biodiesel by catalyzing the alcoholysis reaction of grease with basic resin in a trickle bed. Background technique [0002] Biodiesel is a clean and renewable energy source. It is a liquid fuel made from animal and vegetable fats and oils. It is a high-quality substitute for petroleum and diesel. Biodiesel is a typical "green energy". Vigorously developing biodiesel is of great strategic significance for promoting energy substitution, reducing urban air pollution, and alleviating environmental pressure, etc. for sustainable development of society, economy and environment. [0003] At present, the preparation of biodiesel mainly includes acid method and alkali method with homogeneous catalytic reaction. The preparation of biodiesel by acid catalysis is highly corrosive to equipment. Alkaline catalysis is generally use...

AI Technical Summary

Problems solved by technology

But this method also has many disadvantages: the stirred tank reactor is a liquid-liquid two-phase reaction, methanol and oil are incompatible with each other, and continuous stirring is required during the reaction process, which consumes a lot of energy; the mass transfer effect of the reaction is not ideal, And it cannot be produced continuously; after the reaction, the homogeneous base cannot be recovered, and the production cost is high; the catalyst needs to be neutralized and washed, and a large amount of industrial wastewater will be generated during this process to pollute the environment