The DX (The dry matter content of glucose as a percentage of the total dry matter in the sugar solution)value of the efflux glucose is 70~75% in the mother liquor from current dextrose monohydrate plant. If calculated according to the data that the glucose content in the efflux mother liquor is 72%, and the saccharification DX value in glucose production is 96%, the total dry basis of the total efflux mother liquor accounts for 14% of the total dextrose Monohydrate production. The domestic average control level is far below this, generally controlled at 20-25%. So the amount of mother liquor discharged can be imagined.
The main component of crystallized glucose mother liquor is glucose, and its content is 68-75%. Most of the rest are maltopolysaccharides. Dextrose monohydrate mother liquor produces glucose syrup or other products through modern separation technology. In recent years, the development of modern separation technologies such as chromatographic separation technology and membrane filtration separation technology and their application in the starch sugar industry have also been applied in many domestic enterprises.
The chromatographic separation technology is to use the chromatographic resin to have different adsorption capacities for different components in the glucose mother liquor. The chromatographic resin is used as the stationary phase, and the mother liquor is used as the mobile phase for separation. The process is that the dextrose monohydrate mother liquor is purified through further decolorization, filtration and ion exchange, and finally evaporated and concentrated by an evaporator to obtain a syrup with a dry matter concentration of 60%, and then enters the chromatographic system. Through the principle of chromatographic separation, control the different discharge time of each process to separate the extract and raffinate. Usually the glucose content in the extract can reach 95%, and the glucose yield can reach more than 80%. Domestic chromatographic system manufacturers have reached this level through their own design, and the highest yield achieved by their customers is 85%.
Furthermore, the membrane filtration system can also separate the dextrose monohydrate mother liquor. The principle is to separate the macromolecular substance from the monomolecular sugar through the selection of the molecular size and permeability of the molecular membrane. The glucose content in the filtered syrup can reach 92%. ,it can be used as the raw material for further glucose crystallization.
The development of the above two technologies has put forward a new idea for the comprehensive utilization of dextrose monohydrate mother liquor, and there have been successful cases in China.
In 2011, a domestic sugar industry group also tried to use dextrose monohydrate mother liquor for treatment, and successfully carried out related pilot tests. However, the relatively big problem of this technology is that the initial investment in equipment is relatively large, and the sale and treatment of the residual liquid after extraction is a big problem. The glucose content of the raffinate after chromatography or membrane filtration separation is generally below 30%, and the rest are polysaccharide components. The use of this product is worth re-developing and exploring, otherwise it will directly affect the further advancement of this technology. At the same time, equipment operation requires related supporting facilities, such as water treatment systems. Chromatography or membrane separation systems have high requirements on water quality and need supporting water treatment equipment. At the same time, since the concentration of the chromatographic extract or the membrane separation extract is about 30%, further concentration is required. The energy consumption for concentration is also relatively large. Therefore, the application of this new technology has certain limitations.
The application of dextrose monohydrate mother liquor in the production of fructose syrup has not been reported or studied in China at present. A domestic sugar industry group has used its own scientific research strength to apply dextrose monohydrate mother liquor to the production of fructose syrup.
F30 fructose syrup has been successfully produced through continuous experience exploration and technical transformation, and has applied for enterprise standards. It opens up a new way for the comprehensive utilization of Dextrose monohydrate by-products.