Extraction method of microalgae oil

Abstract

The invention provides an extraction method of microalgae oil. The oil is extracted by the following steps: adding 30-100% by mass of organic acid and 0-3% by mass of inorganic acid into microalgae in a solid-to-liquid ratio of kg: L of 1: (3-20); treating for 0.25-5.0 hours; and adding an organic solvent to extract oil. According to the method, the organic acid is adopted for the first time to crush cells, and then, the oil in cells is extracted by the organic solvent. The organic acid and the organic solvent can be further added at the same time. By adopting the process, oil with the yield greater than 90% can be obtained, and the organic acid is easy to recover and recycle, so that wastewater discharge is reduced, and the demand on equipment is low. Compared with conventional extraction processes of microalgae oil, the extraction method provided by the invention is simple to operate and less in environmental pollution, and has a good industrialized application prospect.

Description

technical field [0001] The invention relates to the fields of renewable resources and biochemical industry, in particular to a method for extracting microalgae oil. Background technique [0002] In recent years, due to the increasingly severe energy shortage and environmental damage, the development of bio-energy has become the focus of global attention. Among them, the development of biofuels (biodiesel or aviation fuel, etc.) based on renewable oils and fats has attracted much attention. A sustainable supply of oil is key to the development of biofuels derived from renewable oils. In recent years, microalgae oil has been widely concerned by experts and scholars at home and abroad as a raw material for biofuel. Microalgae have a short life cycle, fast growth rate, can adapt to a variety of planting conditions, and can be harvested throughout the year. In addition, the cultivation of microalgae takes up less area, so it does not need to use common agricultural land and sa...

AI Technical Summary

Problems solved by technology

Among them, the mechanical crushing method includes high-pressure homogenization method, ultrasonic crushing method, ball milling method, microwave method, etc. These methods of crushing cells have high energy consumption and large investment in equipment, so it is difficult to further apply them in industrial production; while chemical methods mainly use inorganic Acid treatment method generally uses strong inorganic acids such as sulfuric acid, hydrochloric acid, etc. The amount of inorganic acids used to break cells with inorganic acids is large (the general amount is more than 10% based on the dry matter of microalgae), and inorganic acids are not only difficult to recover, but also high concentration The inorganic acid in the system will seriously corrode the equipment, and the discharge of acid-containing waste liquid will also have a serious impact on the environment