Fat-soluble vitamin microcapsule continuous cross-linking method and device

Abstract

The invention discloses a fat-soluble vitamin microcapsule continuous cross-linking method and device. Cross-linking is carried out in a horizontal double-shaft hollow blade dryer, an ultraviolet irradiation device is arranged at the top of an inner cavity of the dryer, and the method comprises the following steps of 1) preheating the dryer, and introducing a mixed gas of carrier gas and water vapor into the cavity of the dryer; and 2) starting the dryer and the ultraviolet irradiation device, adding the fat-soluble vitamin microcapsules to be cross-linked into the cavity of the dryer, adjusting the temperature and humidity in the cavity of the dryer, and carrying out cross-linking reaction under ultraviolet irradiation to prepare the water-repellent fat-soluble vitamin microcapsules. The cross-linking method has the advantages of continuous production, a uniform particle cross-linking degree, low energy consumption, less gas consumption, short cross-linking time, a low vitamin active ingredient loss rate, a high microcapsule yield, low surface oil, a long product shelf life and the like.

Description

technical field [0001] The invention relates to a method and device for continuous cross-linking of fat-soluble vitamin microcapsules, in particular to a horizontal double-shaft hollow paddle dryer and a method for continuous cross-linking of fat-soluble vitamin microcapsules. Background technique [0002] Microcapsule technology is a technology in which trace substances are wrapped in polymer films, and is a micro-packaging technology for storing solids, liquids, and gases. Microcapsules can control the release of stored solids, liquids or gases under certain conditions to achieve specific effects. The embedded substance is called the core material, such as fat-soluble vitamins: vitamin A, D, E, K, carotenoids, etc.; the substance embedded in the core material to achieve microencapsulation is called the wall material, such as gelatin, glucose, fructose etc. [0003] Existing microcapsules are generally prepared by dispersing the core material in an aqueous solution of the...

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Problems solved by technology

However, the crosslinking temperature is as high as 110°C, which may cause the deterioration of vitamins, and the heat utilization efficiency is low. A large amount of air will take away a large part of the heat, resulting in a lower heat utilization rate.

[0006] Chinese patent CN109418541A ​​discloses a novel method for preparing water-repellent fat-soluble vitamin microcapsules, wherein the microcapsules are also cross-linked in the form of fluidized drying, but the cross-linking temperature is 60-130°C, and the cross-linking The temperature is high, and vitamins are generally heat-sensitive substances, and cross-linking at high temperatures will easily cause the loss and deterioration of effective components

[0007] Chinese patent CN106622051A discloses a method of preheating a fixed fluidized bed and passing water vapor into the fluidized bed to adjust the humidity in the fluidized bed for cross-linking, but this method requires continuous feeding of a large amount of Hot air and hot water vapor cause great heat loss; and, during the crosslinking process, the particles boil in the air, and due to the inhomogeneity of the particle size, the boiling height of the particles is different, resulting in particles of different particle sizes in the There are differences in temperature and humidity during the cross-linking process. In the same batch of cross-linking process, it is easy to cause a large difference in the degree of cross-linking of the particles.

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