Microwave technology in oil seed-oil processes in the application
Camellia seed oil is one of our oldest woody edible oil. Its nutrients unlike ordinary vegetable oil, so more and more people of all ages. The application of microwave technology to the camellia seed oil preparation process, by comparison with conventional extraction process, Microwave aided preparation camellia seed oil can not only meet the requirements of hot pressing process, the same process and can meet the cold-pressed oil seed cake made from Oil process requirements.
An oil seed Profile
1.1 The origin and quality of tea seed oil
Since the origin of the oil seed varieties and harvesting, drying in different forms, its moisture content, shelling percentage, oil content is also different. Therefore, the system operating parameters during oil there are also differences. The system features camellia seed oil tea seed oil contains high tea saponin, starch and sugar. In the press process, the starch in the pressing chamber as the expansion coefficient of the differences in the expansion coefficient of the protein, the pressing chamber pressure is only squeezed into the material by adjusting the impedance of the press and plasticity smoothly.
So, people shell containing virgin material consumption and water-oil is squeezed important operating parameters. Shell containing moisture content is too low or too high plasticity increases, pressure decreases; otherwise the resistance is increased, squeezing hard, serious cause explosion bore squeeze machine, resulting in mechanical failure. Affect the leaching process is the key factor tea saponin, sugar and water. You Qiming water will produce large amounts of feed materials group (commonly known as the oil eggs), could easily lead to leaching paths lengthened and material handling difficulties, severe will produce a lot of foam, so that the solvent does not come into contact with blanks, wet meal can not be distilled off. In the production process, the kernel shell containing tea seed oil should be based on the origin and species dependent.
2 camellia seed oil pressing process
2.1 Conventional hot pressing process
Camellia seed conventional hot pressing process:
Clean up an oil seed a magnetic one peel a kernel shell separation billets (broken) a steaming and roasting (quenched) one press of a hot tea seed oil extraction of crude oil.
As can be seen from the process, hot pressing process and the general fuel no essential difference.
2.2 Conventional cold pressing process
Conventional tea seed oil cold pressed process: a clean-up an oil seed sheller a kernel shell magnetic separation a crush a cold tea seed oil extraction of crude oil.
Conventional cold pressed refers to raw materials in the clean, peel, kernel shells separated without heat treatment such as steaming and roasting direct pressing, squeeze the hair oil temperature is below 75. Conventional cold-pressed oil prevents oxidation, so that virgin oils obtained better flavor, nutrients retained more completely.
2.3 Microwave-assisted cold pressing process
Microwave-assisted seed oil cold pressed process: cleaning up an oil seed a magnetic one peel a kernel shell separation an billets (broken) a microwave squeezing a tea seed oil hair oil. Microwave-assisted cold pressing process is a process based on conventional cold-pressed to increase the microwave tunnel, the crushed seed kernel oil uniform microwave irradiation, it has been initially damaged cells, easy to extract oil. As the material inside the tunnel in the microwave irradiation time is shorter, the material temperature is not higher than 55 ℃, benevolence cells still have to get through the crush damage. The process route in terms of oil quality upgrade from a step, but the output is still not very good overall efficiency.
2.4 Microwave assisted in the temperature press
2.4.1 Microwave-assisted pressing process in the temperature
Clean up an oil seed a magnetic one peel a kernel shell separation an billets (broken) a microwave irradiation
An air-cooled a microwave an oil seed crushing a hair oil. The process route is in the microwave-assisted cold pressing process route based on the increase of a cooling tunnel equipment and a microwave. In order to make billets (broken) after oil seed kernel cells to be destroyed, to the beginning of the microwave radiation, air-cooled, and then microwave irradiation by microwave irradiation twice lost a lot of water, most of the cell wall is opened, loosely organized, the oil in the free state, then squeeze out the oil easier.
2.4.2 Microwave-assisted superiority in the temperature pressing process
This process not only makes the oil seed kernels cells get destroyed, but also the guarantor virgin material temperature not higher than 75 ℃, resulting camellia seed oil flavor intact, production increased, decreased residual oil cake, not only has the advantages of conventional cold pressing process, higher oil yield, but also to solve the conventional hot pressing temperature easily oxidized crude oil, crude oil and refining of low quality and low problem, with environmental protection, energy efficiency and other advantages. Conventional cold-pressed extra virgin lowest temperature process people, but when asked and pressed dry cake residual rate is highest.
Obtained using the technology, although rose camellia seed quality, but production process than conventional hot pressing down 1/3 of its overall efficiency is smaller than conventional hot pressing. Conventional hot pressing process, the material in the pressing chamber within the shortest time crush, single output can reach more than 92% of design capacity, dry cake residual oil rate is low, but high temperatures; microwave-assisted design of cold-pressed process yield only yield 80 %, although oil quality improved, but overall efficiency is still not very satisfactory. And after two medium-temperature microwave microwave cake residual oil pressing process the lowest rate, the temperature is moderate, is a desirable and practical process route.
3 Microwave-assisted leaching process
3.1 Microwave-assisted leaching process
Oil seed cake a smash a preheat a microwave a leaching an evaporation a crude oil tea seed oil extraction.
3.2 superiority of microwave-assisted leaching process
Microwave leaching process is the crushed oil seed cake in the microwave irradiation tunnel, so that the material rapidly vaporized water spills, gas bursting the cell wall formation of many small micro larvae L, as solvent infiltrated deep built a smooth material channel, greatly improving the leaching efficiency; microwave irradiation in the process before the oil seed cake preheat temperature was raised to not less than 50 ℃, and then enter the tunnel microwave irradiation, in a very short period of time so that the material cells to be both destruction, while maintaining the original flavor of tea seed oil and oil seed meal quality.
By microwave irradiation via a transfer material after natural cooling process, into the leaching temperature is low within the same even if the leaching could achieve better results, with low leaching characteristics. The process has a high extraction rate, crude oil, bright color, leaching time is short, low solvent consumption, low energy consumption and low residual oil meal.
4 Conclusion
The use of microwave-assisted preparation of tea seed technology to enhance the quality of the oil, apart from the raw materials to bring kill mold camellia seed oil, to avoid the conventional production process increased peroxide value, to ensure product quality.
Microwave-assisted process preparation camellia seed oil, improve amazing rate, the full use of the limited resources of oil seed and improve the economic and social benefits, and has broad prospects for development.

 

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