Material basket for supercritical fluid extraction and extraction device comprising same

Abstract

The invention discloses a material basket for supercritical fluid extraction and an extraction device comprising the same. The material basket comprises a material basket barrel. A lower filtering device is arranged at the bottom of the material basket barrel and connected with a flow guiding device; or the lower filtering device is arranged at the bottom of the material basket barrel, an upper filtering device is further arranged above the material basket barrel, and the upper filtering device and / or the lower filtering device are / is connected with the flow guiding device. The flow guiding device comprises a flow guiding pipe, the bottom end of the flow guiding pipe is located below the upper filtering device and / or the lower filtering device, the top end of the flow guiding pipe is located above the upper filtering device and / or the lower filtering device, flow guiding holes are formed in the side wall of a pipe body located below the upper filtering device and / or the lower filtering device, and a screen is arranged on the pipe body provided with the flow guiding holes. The flow guiding pipe can prevent the filtering devices from being rapidly and seriously blocked, and the flow guiding pipe and the part, horizontally extending into the material basket barrel, of the inner wall of a sealing ring seat jointly act to achieve a better synergistic effect, so that seed kernel raw materials rich in grease are rapidly, stably and completely extracted.

Description

technical field [0001] The invention relates to the technical field of supercritical fluid extraction, in particular to a material basket for supercritical fluid extraction and an extraction device composed of the same. Background technique [0002] Supercritical fluid extraction, especially supercritical carbon dioxide (CO 2 ) Fluid extraction is an efficient and clean chemical extraction and separation technology. It has the advantages of non-toxic, non-polluting, no residue, high solubility and easy separation of the extraction medium. Therefore, it has been favored by the industry in recent years. Its industrialization Apps are in the ascendant. The principle of supercritical fluid extraction is to use supercritical fluid as an extraction agent and its special solvent properties in a supercritical state, and extract and separate target components from liquid or solid raw materials under appropriate extraction pressure and temperature. [0003] The supercritical fluid e...

AI Technical Summary

Problems solved by technology

[0005] 1) When extracting a variety of kernel raw materials, such as walnut kernels, camellia seed kernels, sesame seeds, peony seeds, ingots, garlic fruits, and cane fruits, etc., since such raw materials contain a large amount of oil, protein, and sugar substances, their After pulverization, the fluidity is poor and it is easy to stick, agglomerate or harden. The raw material bed is prone to serious agglomeration and channeling during the extraction process, which will lead to extraction dead corners, slow extraction speed and uneven extraction of raw materials in the basket. ,incomplete;

[0006] 2) When extracting a variety of kernel raw materials, such as walnut kernels, camellia oleifera seeds, sesame seeds, peony seeds, ingots, garlic fruits, and cane fruits, etc., when supercritical CO 2 After the fluid enters the raw material bed and boosts the pressure for a period of time, due to the existence of intertwined oil-powder mixture, it is easy to cause serious agglomeration of the raw material or serious blockage of the filter device, or a series of serious consequences such as severe channeling, such as: in supercritical CO 2 During the fluid extraction process, the raw materials inside the basket are subjected to supercritical CO 2 The impact force of the fluid from bottom to top and the buoyancy of the raw material itself, together with the supercritical CO 2 The kernel raw materials in the fluid usually swell and the penetration inside the raw materials is poor, so the gravity of the raw materials is generally not enough to overcome the power of the raw materials to move upwards, so that the raw materials in the basket cylinder are particularly special during the supercritical extraction process. However, at the beginning, it often continues to move upward and squeeze the filter device, causing the filter device to be severely blocked, and then a high pressure difference is formed between the inlet and outlet ends of the filter device, and the formation of the high pressure difference will further break through the filter screen and The filter device is seriously deformed, which not only damages the filter device, but also makes the extraction production unable to continue due to potential safety hazards; in addition, when supercritical CO 2 When the fluid continues to flow upward rapidly from the broken part of the filter, the raw material bed will soon form a larger and larger channel flow, resulting in incomplete extraction, low yield and other extraction failures

[0007] In addition, a large number of production practices also show that supercritical CO 2 The following problems generally exist in fluid extraction: (1) The extraction is not complete, and the residual rate of the product is as high as 10%-20% in general extraction (that is, the recovery rate of the product is only 80%-90%), and the product loss is large; (2) The extraction process When the recovery rate of the product reaches 80%, if you want to increase the recovery rate of the product by 10%, you need to double the extraction time, so that the extraction production cost will be doubled accordingly; (3) For the oil-rich kernels Raw materials, such as camellia seed kernels, walnut kernels, peanut kernels, etc., often have serious clogging of the filter device, resulting in unsustainable extraction and complete extraction failure due to serious channeling

Studies have shown that these problems cannot be solved by changing the extraction process conditions alone

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