RU2250232C1 - Method for pectin production - Google Patents

Abstract

FIELD: technology for pectin production.

SUBSTANCE: claimed method includes freezing of pectin-containing raw material followed by defrosting, hydrolysis-extraction, phase separation and isolation of target product from liquid phase. Freezing is carried out with liquid carbon dioxide, and defrosting and hydrolysis-extraction is carried out with distillated water. In hydrolysis-extraction process pressure in reaction mixture is periodically dissipated up to value, which provides liquid phase boiling, and increased again up to starting value.

EFFECT: increased pectin yield with simultaneous decreasing of technological cycle time.

Description

The invention relates to pectin production technology.

A known method for the production of pectin, comprising freezing pectin-containing raw materials, defrosting with hot water, hydrolysis-extraction with an enzyme preparation solution, phase separation and isolation of the target product from the liquid phase (SU 467732, 04/25/1975).

The disadvantages of this method are the duration of the technological cycle and the low yield of pectin.

Closest to the proposed method is the production of pectin, which involves freezing pectin-containing raw materials in acid, defrosting by conductive heating, hydrolysis-extraction with the addition of water, phase separation and isolation of the target product from the liquid phase (SU 1052510 A, 07.11.1983).

This method compared with the previous one allows you to slightly increase the yield of pectin and slightly reduce the duration of the technological cycle.

The technical result of the invention is to increase the yield of pectin and reduce the duration of the technological cycle.

This result is achieved by the fact that in a method for the production of pectin, which involves freezing pectin-containing raw materials, defrosting them, hydrolyzing-extracting, phase separation and isolating the target product from the liquid phase, according to the invention, freezing is carried out with liquid carbon dioxide, and defrosting and hydrolysis-extraction are carried out with distilled water , while in the process of hydrolysis-extraction, the pressure in the reaction mixture is periodically dropped to a value that ensures the boiling of the liquid phase, and increase to similar values.

The method is implemented as follows.

Known pectin-containing raw materials (Donchenko L.V. Technology of pectin and pectin products. A textbook for university students - M .: DeLi, 2000, p. 51) is poured with liquid carbon dioxide and frozen by reducing pressure, Part of the carbon dioxide diffuses into the frozen raw materials and, combining with the water contained in it, forms carbonic acid. As in the closest analogue, this leads to the destruction of part of the cell membranes of frozen raw materials by ice crystals and the beginning of hydrolysis of protopectin under the action of acid. Frozen raw materials are defrosted with distilled water to obtain a hydrolysis-extraction reaction mixture in which carbon dioxide, combined with water, forms carbonic acid. The use of distilled water makes it possible to accelerate extraction from processed raw materials due to the greater difference in the concentrations of soluble substances in the liquid and solid phases. In the process of hydrolysis-extraction, the pressure in the reaction mixture is periodically dropped to a value that ensures the boiling of the liquid phase, and increased to the initial value.

The initial pressure in the reaction mixture is atmospheric. The initial temperature corresponds to the equilibrium temperature of the mixture of water and defrosted raw materials. Pressure relief is carried out to a value corresponding to the boiling pressure of water at the temperature of the reaction mixture. The restoration of pressure to its original value after its discharge is carried out by depressurizing the apparatus in which hydrolysis-extraction is performed. The frequency and number of pressure drops is determined by a known method (V. Lomachinsky. Highly efficient technologies for processing plant materials. - M.: Russian Technologies, 1996, p. 54-56).

The formation of each bubble of the gas phase in the reaction mixture is accompanied by the creation of a shock wave that destroys the cellular structure of pectin-containing raw materials, which leads to a drop in its diffusion resistance, development of the phase contact surface and the intensification of hydrolysis-extraction, as a result of the two previous processes. After completion of the hydrolysis-extraction, phase separation and the isolation of the target product from the liquid phase are carried out by known methods (Donchenko L.V. Technology of pectin and pectin products. A manual for university students. - M .: DeLi, 2000, pp. 91-95).

It should be answered that due to the intensification of mass transfer at the stage of hydrolysis-extraction and reduction of the duration of this stage of the technological cycle, losses of pectin substances, which are less hydrolyzed by acid, are reduced, which increases their yield by 15-20% compared to the closest analogue

Thus, the proposed method allows to reduce the duration of the technological cycle due to the intensification of mass transfer at the stage of hydrolysis-extraction and to increase the yield of pectin substances by reducing their irreversible losses.

Claims (1)

A method for the production of pectin, which provides for the freezing of pectin-containing raw materials, their defrosting, hydrolysis-extraction, phase separation and separation of the target product from the liquid phase, characterized in that the freezing is carried out with liquid carbon dioxide, and defrosting and hydrolysis-extraction is carried out with distilled water, while in the process hydrolysis-extraction, the pressure in the reaction mixture is periodically dropped to a value that ensures the boiling of the liquid phase, and increased to its original value.