Biodiesel preparation by industrial transesterification and its impact on the environment
Fan, Pengyu (2022)
Fan, Pengyu
2022
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-202204084752
https://urn.fi/URN:NBN:fi:amk-202204084752
Tiivistelmä
At present, the dual problems caused by the shortage of non-renewable resources of fossil fuels and the negative impact of fossil fuels on the ecological environment are becoming increasingly serious, making the development and application of renewable energy an important part of the energy strategies of countries around the world. Biodiesel is a typical renewable and clean fuel, which is produced from some natural and renewable raw materials (vegetable oil, waste oil and microbial grease). Biodiesel is easy to burn, non-toxic and biodegradable. Compared with petroleum-based regular diesel, biodiesel has high cetane number, low aromatic content, better low-temperature startability and low greenhouse gas emissions. It has received considerable attention in controlling pollution caused by petroleum combustion. Among the methods for preparing biodiesel, transesterification is the most commonly used technique. The aim of this thesis work was to further investigate the application of transesterification technology in industrial production and its impact on the environment.
Heterogeneous catalysts are more promising than homogeneous catalysts because they can be easily separated from the product and reused in several cycles, thus reducing the overall production cost. Immobilization of lipases on nanocatalysts increases their activity and surface area and has the advantage of easy catalyst recovery and multi-cycle reuse, at the same time enzyme stability can be improved by immobilization. Liquid lipase formulations for biodiesel production are growing rapidly because they have better miscibility with the reactants, reduce mass transfer limitations and increase reaction rates. Selection of the right catalyst is a key factor in biodiesel synthesis. Heterogeneous catalysts and lipase catalysts are excellent choices.
Heterogeneous catalysts are more promising than homogeneous catalysts because they can be easily separated from the product and reused in several cycles, thus reducing the overall production cost. Immobilization of lipases on nanocatalysts increases their activity and surface area and has the advantage of easy catalyst recovery and multi-cycle reuse, at the same time enzyme stability can be improved by immobilization. Liquid lipase formulations for biodiesel production are growing rapidly because they have better miscibility with the reactants, reduce mass transfer limitations and increase reaction rates. Selection of the right catalyst is a key factor in biodiesel synthesis. Heterogeneous catalysts and lipase catalysts are excellent choices.