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Dehydration method

A technology of water content and rehydration rate, applied in the direction of preservation of fruits/vegetables by dehydration, preservation of fruits and vegetables, food preservation, etc., can solve the problems of not being particularly economical, slow consumption, cell rupture, etc.

Inactive Publication Date: 2007-07-18
FEYECON DEV & IMPLEMENTATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But freeze-drying is known to cause cell rupture and increase the vegetable's water permeability
And because freeze-drying is a very slow process that consumes a lot of energy, it is not particularly economical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 - Batch drying of broccoli without circulation

[0039] Experimental procedure

[0040] The experiments were carried out in a 1 liter pressure vessel which could be heated or cooled by means of an oil-filled jacket. In the experiment, 500 g of zeolite type 3A (J.T. Baker(R)) was charged into the vessel. On the zeolite is placed a maze on which 65 g of broccoli fragments wrapped in polyester cloth are placed. Before the experiment, the broccoli was thawed and weighed. Liquid carbon dioxide (65 bar) was introduced into the vessel to a level such that both the broccoli and the zeolite were submerged. The jacket temperature was set at the desired temperature (22°C). Extraction lasts 16 hours. The CO is then pumped through a valve installed at the bottom of the vessel 2 Remove from container. After the pressure was released, the container was opened and the broccoli was weighed to determine the mass loss.

[0041] result

[0042] After treatment with liqu...

Embodiment 2

[0043] Example 2 - Cyclic Batch Drying of Broccoli

[0044] Two experiments were carried out in a 6-liter vessel, and the CO was continuously circulated during dehydration by using a circulation pump. 2 flow in the container. As described in Example 1, approximately 70 g of broccoli - wrapped in polyester cloth - was placed on a screen placed on a bed of 700 g of zeolite 3A. CO 2 Flow up from the bottom. The vessel is heated with oil through the jacket. The steps used were the same as described in the previous example, except that the circulation pump was turned on during the dehydration process to increase the drying rate. The conditions used in the experiments and the results obtained are summarized in the following table:

[0045]

Embodiment 3

[0046] Example 3 - Drying Fresh Broccoli in a Separate Container

[0047] Cut fresh broccoli into pieces 1-2 cm in size. Blanch the pieces for 90 seconds. Remove by absorbing the attached water on the paper fabric. Arrange broccoli among four plates and place in first container. The container wall is equipped with electric heating wires. Zeolite 3A was placed in a second container in a cotton holder. The second vessel is fitted with a jacket through which hot water can flow to heat the vessel and contents. The second container is connected to the first container by a bottom and a valve. The first container is connected to the inlet of the circulation pump through the bottom. The outlet of the first container is connected to the top of the second container through a valve. In the pipeline connecting the first container and the circulation pump, a liquid separator is provided to remove liquid water during the treatment process. Between the liquid separator and the circ...

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PUM

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Abstract

The present invention relates to a method of dehydrating pieces of intact plant or animal tissue, said pieces containing at least 30 wt. % of water, the method comprising (i) contacting the pieces of intact tissue with a pressurised gas to reduce the water contenit of the pieces by at least 50 %, said pressurised gas having a pressure of at least 0.5xPc and a temperature of at least Tc-60 DEG C, Pc representing the critical pressure of the gas and Tc representing the critical temperature of the gas, and (ii) separating the pressurised gas from the dehydrated pieces, wherein at least 80 wt. %, preferably at least 90 wt. % of the matter removed by the gas from the pieces of intact plant or animal tissue is water. The invention also provides a method of dehydrating a material containing at least 30 wt. % of water, using a method as described before, followed by drying the separated pressurised gas by contacting said pressurised gas with a water absorbent water adsorbent; and recirculating the dried pressurised gas to the partially dehydrated material.

Description

technical field [0001] The present invention relates to a method for dehydrating undamaged pieces of plant or animal tissue, such as fruit, vegetables, meat, shellfish or parts thereof. The dehydrated fragments obtained by the present method are capable of substantially instant and substantially uniform recovery upon addition of water. Moreover, the rehydrated fragments obtained after reconstitution showed a very similar appearance and structure to the original fragments. [0002] The present invention also provides a method of dehydrating a material comprising (i) contacting the material with an extraction solvent to reduce the water content of the material; (ii) separating the solvent from the partially dehydrated material; (iii) extracting the material by contacting the solvent with a water absorbent or adsorbent to dry the solvent; and (iv) recycling the dried solvent to the partially dehydrated material. Background technique [0003] It is well known in the art of foo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/02A23L1/015A23L5/20
CPCA23B7/0205A23B4/033A23L1/0152A23L5/23
Inventor W·G·M·阿格特罗夫R·巴蒂亚G·W·霍夫兰德
Owner FEYECON DEV & IMPLEMENTATION
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