Method for extracting ethyl ester enriched fish oil from fish oil refining byproduct

Abstract

The invention relates to a method for extracting ethyl ester enriched fish oil from a fish oil refining byproduct, which comprises the following steps: by taking soapstock and solid lipid of the fish oil refining byproduct as raw materials, recovering the soapstock through an acid-based ethyl ester catalysis process, recovering the solid lipid through an alkali-based ethyl ester catalysis process, performing a secondary three-stage molecular distillation and primary urea inclusion combined process, and enriching to obtain the ethyl ester fish oil having high EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) content. According to the invention, the process is simple and low in cost, solves the byproduct recovery problem during fish oil refining, avoids environmental pollution, changes the wastes into valuable substances, and greatly increases the value of the product; and the physical and chemical indices of the extracted ethyl ester fish oil product conform to the standard, the fish oil has no rancid flavor, the total content of EPA and DHA is respectively increased to 78.42% and 76.15%, and the fish oil achieves better economic benefits.

Description

technical field [0001] The invention relates to the field of fish oil refining, in particular to a method for extracting and enriching EPA and DHA ethyl ester type fish oil from by-products of fish oil refining. Background technique [0002] Refining of fish oil is the process of removing non-glyceride impurities in fish oil, mainly including degumming, deacidification, decolorization and deodorization [Hong Pengzhi, Liu Shucheng, Zhang Chaohua, etc. Refining of tuna oil and its fatty acid composition characteristics[J]. China Fats and Oils, 2006, 31 (6): 90-93; Wang Qiaolong, Deng Fangming, Tang Chunjiang, etc. Research progress in fish oil extraction and refining technology [J]. Grain and Food Industry, 2008, 15 (3): 10-12] . Alkali refining is the most used process for fish oil deacidification, neutralization of free fatty acids in fish oil with caustic soda [Cao Bowei, Chu Shilong. Application of solvent method in soapstock recycling [J]. Heilongjiang Medical Science, 1...

AI Technical Summary

Problems solved by technology

A large amount of soapstock and solid fat produced during fish oil refining still contain polyunsaturated fatty acids such as EPA and DHA. However, because these by-products have the characteristics of fishy smell, many impurities, and dark color, some companies acidify them with sulfuric acid. Fatty acids are sold at low prices to chemical companies to process them as leather fatliquor, but they are often unable to make ends meet; some companies directly use them as biofuels or discharge them through simple treatment, resulting in waste of resources and even pollution of the environment

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