Method for preparing reducing sugar by supercritical hydrolysis of plant fibers and semi-continuous reactor thereof

Abstract

The invention discloses a method for preparing reducing sugar by the supercritical hydrolysis of plant fibers and a semi-continuous reactor thereof. According to the method, supercritical hydrolysis is realized by high-pressure feeding and high-pressure sampling. The reaction conditions of a reactor are that: the temperature is between 380 and 400 DEG C; the pressure is 24 to 30MPa; the volume ofwater in a kettle is 150 to 200mL; solid-liquid ratio (g / g) of added plant fiber slurry is 1:30-1:65; and reaction time is 5s to 5min. The reactor comprises a feeding part, a reactor body and a product collecting part, wherein the feeding part presses materials into the reactor by the high pressure stored in a material storage tank; and the sampling part presses a reaction product into a sample receiving bottle through a sampling tube by the high pressure in the reactor. Because the volume of the supercritical water is much more than that of the materials, the materials can smoothly exchange heat in an instant to reach the set condition. The process is considered not to be subjected to other reactions beyond the supercritical condition. The yield of the reducing sugar prepared by the method can be over 50 percent.

Description

technical field [0001] The invention relates to a technology for preparing reducing sugars by hydrolysis of plant fibers, in particular to a semi-continuous reaction device and a method for preparing reducing sugars by supercritical hydrolysis of plant fibers. Background technique [0002] With the rapid development of the global economy in today's world, the demand and consumption of energy has increased, and the development and utilization of non-renewable resources such as coal, oil and natural gas has been increased. The increasing depletion of coal, oil, etc. and the use of them have brought a series of environmental pollution problems such as greenhouse effect and water pollution, forcing the world's energy structure to urgently change from a model dominated by petrochemical energy to one dominated by renewable energy. mode conversion. Therefore, finding new energy sources to replace fossil fuels such as petroleum and coal is an urgent task of scientific research. ...

AI Technical Summary

Problems solved by technology

The problem caused by the operation of this intermittent device is that the heating process needs to go through a process other than the supercritical state to reach the supercritical state, and the material has already started to react before reaching the supercritical state, and the heating time is too long, etc., which will cause low temperature. Polysaccharides and glucose continue to be decomposed into by-products such as furfural and ketones, resulting in low yields of reducing sugars, and by-products can strongly inhibit fermentation, thereby affecting the ethanol production rate of the entire fermentation; and it takes time to cool after the reaction, during the cooling process The materials in the medium are still reacting, which will directly affect the accuracy of the test results

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