Introduction of extraction and processing technology of rapeseed oil

Introduction of extraction and processing technology of rapeseed oil

If an oil factory wants to build a rapeseed oil production line, it must first understand the production process of tea oil, conduct comparative analysis, and choose an appropriate production plan. Currently, the processes that can realize industrialized production of rapeseed oil include pressing method, leaching method, ultra-high There are many kinds of critical extraction methods, etc., here is a brief introduction to the process of extracting rapeseed oil by various processes.

Pressing method: In the process of production, without chemical substances, the oil in the oil is squeezed out by mechanical and physical methods, which can be divided into hot pressing and cold pressing. The hot-pressed oil production method uses screw pressing to extract oil, which can accelerate the formation of oil aroma and enhance oil flavor at high temperature

The solid impurities in the oil can be separated by precipitation, but refining is required to reduce the acid value of the oil and clarify the color of the oil. The hot pressing method has a simple process and low equipment investment cost, but the protein contained in the oil will be destroyed during the production process, which is not conducive to the deep processing and reuse of the pressed cake.

Many large-scale oil plants will cold-press rapeseeds when they carry out large-scale production, and control the pressing temperature at about 70 degrees Celsius, so as to avoid the dark color of the oil caused by high temperature, and the impurities in the cold-pressed oil are less after simple treatment. It can reach the edible oil that meets the standard. The oil can basically retain the flavor of the rapeseed itself, the active substances contained in it are well preserved, the taste is good, and the nutritional value is high. The extracted edible oil is favored by consumers, usually large-scale oil plants. The process of extracting rapeseed oil, the obtained pressed cake can be subjected to leaching treatment.

The leaching method uses the principle of mutual dissolution of solvent and oil, and extracts edible oil through mutual contact between solvent and oil. Solvents such as No. 6 solvent, n-hexane, and petroleum ether are usually used. The extraction method simplifies the technological process, can develop and utilize Camellia oleifera resources to a greater extent, improve economic benefits, and form automated production, which can achieve the advantages of oil yield, utilization of by-products, etc., but the extracted crude oil contains a small amount of The solvent needs to be fully refined before it can be sent to the market for sale.

Supercritical fluid extraction is a new type of separation technology. It uses the influence of pressure and temperature on the dissolving ability of supercritical fluid, and uses supercritical fluid carbon dioxide to dissolve oil in a supercritical state, and then changes the environmental conditions to make the supercritical fluid carbon dioxide dissolve oil. reduced to achieve grease separation. Generally speaking, it is similar to leaching oil, but the advantages of supercritical fluid extraction are more obvious.

During production, the process conditions are mild, the quality of the obtained oil is high, the protein deformation rate in the cake is low, and the comprehensive utilization degree of the by-products is high. The supercritical fluid extraction method is selected to obtain the rapeseed oil. The quality is ideal, and the active ingredients such as vitamin E in the oil are The content is relatively high, but the investment cost of this method is too high, and the requirements for building a factory are strict, so few oil factories on the market choose this process to extract rapeseed oil.

The most widely used rapeseed oil-to-oil process on the market is the pre-pressing leaching method. First, the rapeseeds are cold-pressed or hot-pressed, and then the oil cake is leached. Make full use of by-products, etc., so as to achieve economic and healthy sustainable development. Of course, it is also a good choice for small oil mills to save time and effort.

Whether it is the extraction of rapeseed oil by pressing method or the preparation of tea oil by pre-pressing extraction method, grain and oil equipment plays an important role in it. Good equipment means half of the success. The oil factory has 40 years of production and manufacturing history. The grain and oil machinery and equipment factory purchased equipment. Years of development have made the manufacturer more familiar with the extraction process of rapeseed oil. The grain and oil machinery and equipment manufactured are in line with the development of the current oil factory, which makes many customers full of praise.