Multi-basket step-by-step supercritical fluid extraction kettle

Abstract

The invention discloses a multi-basket step-by-step supercritical fluid extraction kettle. The supercritical fluid extraction kettle comprises a kettle body with an extraction cavity and a kettle cover, at least two sections of baskets are arranged in the extraction cavity, an extraction medium inlet is formed in the bottom of the kettle body, a basket sealing device is arranged between the innerside wall of the kettle body and the outer wall of each section of basket, every two vertically adjacent sections of baskets are not connected with each other, an inter-basket flow collecting area anda top flow collecting area are respectively arranged between every two adjacent baskets and at the upper part of the uppermost basket, a top extraction medium outlet and inter-basket extraction medium outlets which are aligned with the top flow collecting area and the inter-basket flow collecting areas are formed in the kettle body, and the outlet ends of the top extraction medium outlet and theinter-basket extraction medium outlets are connected with closing devices. According to the invention, step-by-step extraction of raw materials in multiple baskets from bottom to top can be realized,channeling and caking phenomena of the raw materials with high oil content in the extraction process are avoided, stable, rapid and thorough extraction is ensured, and the extraction efficiency and effect are improved.

Description

technical field [0001] The invention relates to the technical field of supercritical fluid extraction, in particular to a multi-basket step-by-step supercritical fluid extraction kettle. Background technique [0002] Supercritical fluid extraction is an efficient and clean chemical extraction and separation technology, which has the advantages of non-toxic, non-polluting, non-residue, high solubility and easy separation of extraction media. The principle of supercritical fluid extraction is to use the extraction medium (such as supercritical carbon dioxide fluid) as a solvent. In a supercritical state, the supercritical fluid is contacted with a solid substance, and at a suitable pressure and temperature, it is selectively extracted. The target components are extracted. [0003] Supercritical fluid extraction kettle is the most important core equipment in supercritical fluid extraction. At present, the commonly used supercritical extraction kettle mainly includes kettle bod...

AI Technical Summary

Problems solved by technology

[0004] 1) The loaded basket or basket group is heavy, and the hoisting and removal of the basket requires a large power device, and the height of the closely connected basket group is high. In order to adapt to the hoisting and removal of the basket group, it is necessary There is sufficient operating height and space above the cover of the extraction kettle to facilitate the hoisting and removal of the basket group, which requires a higher workshop, which increases the cost of the factory building and equipment costs, especially for large extraction kettles. ;

[0005] 2) When extracting powder raw materials with high bulk density and high oil content (for example, the oil content is greater than 30%), the powder raw materials are usually prone to serious agglomeration due to their own accumulation gravity or the precipitation of oil after the raw materials are crushed. Then, when the extraction medium enters the raw material, there will be obvious channel flow, which will make the flow distribution of the extraction medium unbalanced, resulting in the extraction dead angle of the raw material in the basket, slow extraction speed, uneven and incomplete extraction, and the product in the raffinate. The residual amount is large, which increases the extraction cost and product loss, which makes it impossible to achieve large-scale effective extraction production of raw materials that are easy to agglomerate or have high oil content in practice

As the extraction medium is gradually saturated from bottom to top, the raw materials in the upper basket can no longer be effectively extracted, which instead increases the resistance to the fluid

On the other hand, for the seed raw materials rich in oil, the screen on the top of the basket is often blocked by the intertwined oil-powder mixture, resulting in a large pressure difference between the fluid inlet and outlet of the extraction kettle, and the formation of the pressure difference is difficult. It will further lead to a vicious circle of raw material agglomeration and screen blockage, which will lead to the failure of normal extraction production

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