Method for processing traditional Chinese medicine extract liquid by adopting microfiltration-membrane distillation technology

Abstract

The invention provides a method for processing a traditional Chinese medicine extract liquid by adopting a microfiltration-membrane distillation technology. The method comprises Chinese herbal medicine extract liquid pretreatment, microfiltration treatment and membrane distillation treatment. The method has the following advantages: membrane pollution is prevented or reduced, the membrane flux is basically not reduced, and the membrane cleaning or replacing cycle is long; the method is operated under normal pressure at a low temperature, so bioactive substances in an original material system are effectively reserved, the reservation rate of effective components is improved, and the reservation rate of the effective components is 86-89% when the concentration ratio reaches 16; the reservation rate of the effective components is 88-91% when the concentration ratio reaches 12; the reservation rate of the effective components is 90-93% when the concentration ratio reaches 8; the reservation rate of the effective components is 92-96% when the concentration ratio reaches 4; the membrane flux in a running state is improved; the concentration ratio reaches 16; energy consumption is further reduced, and the cost is saved; and the operating temperature in the membrane distillation process is low, so the energy consumption is low.

Description

technical field [0001] The invention relates to the field of concentrating Chinese herbal medicine extracts, in particular to the technology of separating and concentrating Chinese herbal medicine extracts by adopting microfiltration-membrane distillation technology. Background technique [0002] The concentration of traditional Chinese medicine extract is an important part of the modernization of traditional Chinese medicine preparation and one of the key unit operations of traditional Chinese medicine preparation. At present, the evaporation and concentration process is widely used in our country, which not only takes a long time and consumes a lot of energy, but also due to the relatively high temperature, in addition to affecting the product quality of heat-sensitive traditional Chinese medicine, it will also cause a large loss of active ingredients. How to solve these problems has become the key to traditional Chinese medicine pharmacy. Extraction, solid-liquid separati...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that it consumes a lot of energy and it is difficult to realize automatic control.

Membrane fouling affects membrane flux and transmittance, and also shortens membrane life

[0028] 2 Problems in the treatment of traditional Chinese medicine by membrane distillation: (1) high membrane cost and low distillation flux, which are the main problems hindering the industrial application of membrane distillation; (2) solids and macromolecules in the liquid medicine , colloid and other substances will form pollutants on the membrane surface during operation, which will reduce the transmembrane flux and affect the concentration rate

(3) Due to the influence of temperature polarization and concentration polarization, the operating state is unstable; concentration polarization means that during the separation process, the feed liquid passes through the membrane under the pressure drive, and the solute is trapped, so the separation between the membrane and the bulk solution The concentration of the interface or membrane interface area is getting higher and higher, causing the osmotic pressure to increase, forming a deposition or gel layer on the membrane surface, increasing the permeation resistance, changing the separation characteristics, causing the membrane to swell or deteriorating the performance of the membrane; (4) Research Most of the work is in the experimental stage, and the quantitative analysis of the mass transfer and heat transfer mechanism and the influence of parameters is not enough

The mass and heat transfer of membrane distillation involves factors such as the porous structure and phase transition of the membrane, and the research on the mechanism is difficult and needs to be perfected; (5) Since the mechanism of membrane fouling is still unclear, on the one hand, the research on membrane fouling theory should be strengthened On the other hand, experimental data and practical experience should be accumulated for different systems, and membrane equipment and membrane materials suitable for the separation of traditional Chinese medicine should be developed to solve the problems caused by membrane fouling in membrane separation applications.

(6) Insufficient understanding of the material composition and characteristics of Chinese herbal medicine extracts. Only individual Chinese herbal medicine formula extracts have been studied, which lacks technical commonality and versatility; the materials used in research are generally simple aqueous solutions, and research on some industrial wastewater few;

[0032] (1) Microfiltration and membrane distillation membranes are prone to pollution, and the service life of the membrane is shortened;

[0033] (2) There is a lot of loss of active ingredients;

[0034] (3) Membrane distillation membrane flux and transmittance decrease;

[0036] (5) High energy consumption and high cost;

[0037] (6) Complicated operation

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