Marine polysaccharide separation and concentration method

Abstract

The invention discloses a marine polysaccharide separation and concentration method which comprises the following specific steps: 1) pretreatment and impurity removal: carrying out pretreatment by adopting a silicon carbide microfiltration membrane (0.1 mu m), and removing suspended matters and colloidal impurities in brine by adopting cross-flow filtration; 2) separating and concentrating part ofmacromolecular soluble marine polysaccharide in the brine by adopting a silicon carbide ultrafiltration membrane (20nm) in the pretreatment permeate liquid in the first step, and concentrating; meanwhile, the permeate liquid is subjected to secondary separation; and (3) carrying out secondary separation and concentration on the permeate liquid generated in the step (2) by adopting an organic nanofiltration membrane (3000Da), and concentrating the trapped fluid while desalting to obtain the marine polysaccharide concentrated solution. According to the method, a multistage membrane separation desalination concentration system is adopted, and the marine polysaccharide concentrated solution with the concentration of being greater than 80% can be obtained; the salt ion removal rate of the concentrated solution is greater than 98%, and the generated waste liquid reaches the discharge standard and can be directly discharged; a silicon carbide film is adopted for pollution resistance; the treatment capacity is high; life cycle cost is low, energy consumption is low, and operation cost is low.

Description

technical field [0001] The invention relates to the technical field of separation and extraction of marine polysaccharides, in particular to a method for separation and concentration of marine polysaccharides. Background technique [0002] Salt-making brine is rich in a variety of biologically active marine polysaccharides, but contains a large amount of salt ions, so in-depth research on brine polysaccharides must first be desalinated. However, the desalination treatment of brine marine polysaccharides is only in the laboratory stage at present. Due to the characteristics of complex operation, long time consumption, high cost, and difficulty in controlling the desalination process, desalination treatment has become a major problem restricting the basic research of brine marine polysaccharides. [0003] Existing polysaccharide separation technologies include dialysis, chromatographic separation and reverse osmosis membrane separation. Among them, dialysis has low separation ...

AI Technical Summary

Problems solved by technology

However, at present, the desalination treatment of brine marine polysaccharides is only in the laboratory stage. Due to the characteristics of complex operation, long time consumption, high cost, and difficulty in controlling the desalination process, desalination treatment has become a major problem restricting the basic research of brine marine polysaccharides.

[0003] Existing polysaccharide separation technologies include dialysis, chromatographic separation and reverse osmosis membrane separation. Among them, dialysis has low separation efficiency, small processing capacity, and is difficult to separate and produce on a large scale; chromatographic separation has high column cost, small processing capacity, and energy efficiency. High energy consumption and high requirements for operators; reverse osmosis membrane separation method membranes are prone to fouling and clogging, and the cost of membrane materials used in food separation is relatively high