4results about How to "Increase economic value added" patented technology

A highly efficient method for recycling waste crystalline silicon solar cells includes the following steps: S1, placing the waste crystalline silicon solar cells in a mixed solution of phosphate and ammonium fluoride to react, dissolving the aluminum back surface and initially etching the silicon nitride layer, causing the silver grid lines to detach, resulting in solid-liquid separation of the silver grid lines and a filter cake; S2, continuing to immerse the filter cake in the mixed solution from step S1 to completely etch the silicon nitride layer, obtaining a silicon wafer; S3, immersing the silicon wafer in a sodium hydroxide solution to remove the surface oxide layer, cleaning, and drying to obtain a high-purity silicon wafer. This invention achieves highly efficient separation of silver and aluminum grid lines from the silicon wafer and precise removal of silicon nitride and oxide layers through a stepwise chemical etching strategy, achieving a total silicon wafer recovery rate of over 96%. The process is short, simple to operate, and has low reagent costs, effectively solving the pollution problem of waste crystalline silicon solar cells, demonstrating significant environmental benefits and economic value, and is easy to scale up and apply.

The invention discloses a creation method of 2-phenethyl alcohol biosynthetic rice with a rose fragrance type characteristic. The creation method comprises the following steps: taking an mDHS1 gene, a PAAS gene and a PAR gene to construct a pRHVc-mDHS1-PAAS-PAR recombinant plasmid, transforming the pRHVc-mDHS1-PAAS-PAR recombinant plasmid into a callus through an agrobacterium tumefaciens-mediated method, and carrying out screening and plant regeneration of resistant calluses to obtain rice with overexpressed mDHS1, PAAS and PAR genes. According to the rice, 2-PE can be effectively synthesized in rice endosperm. Based on a synthetic biological technology and metabolic engineering, the pRHVc vector is used for overexpressing mDHS1, PAAS and PAR genes in rice endosperm through a transgenic means, 2-PE is efficiently and directionally synthesized and stably enriched in rice grains, and the economic added value of rice crops is remarkably increased.

This invention discloses a high-functionality defatted rice bran, its preparation method, and its applications. The method includes: stabilizing fresh rice bran with saturated steam to inactivate lipase, obtaining stabilized rice bran; then using the stabilized rice bran as raw material, extracting and defatting it with supercritical CO2 to separate rice bran oil and high-functionality defatted rice bran. Preferably, the saturated steam treatment temperature is 115-125℃, and the time is 15-25 min; the supercritical CO2 extraction temperature is 45-55℃, the pressure is 25-35 MPa, and the time is 1.5-2.5 h. The defatted rice bran prepared by this invention has a fat content of less than 1.5%, a water-holding capacity of more than 3.0 g / g, an oil-holding capacity of more than 2.4 g / g, and an expansion potential of more than 5.8 g / g. This method is green and environmentally friendly, significantly improving the functional properties of defatted rice bran. The resulting product can be used as a high-dietary-fiber ingredient in baked goods, showing good application prospects.

The invention provides a straw three-element separation method based on enzyme pretreatment and a DES solvent, belongs to the field of biomass resource utilization, and can solve the problems of high energy consumption, serious environmental pollution and low separation efficiency in the existing straw three-element separation method. Comprising the following steps: crushing straws, carrying out enzymolysis pretreatment by using cellulase and hemicellulase, mixing a solid obtained after solid-liquid separation with a DES solvent, and reacting for 2-4 hours under the conditions of 120-150 DEG C and 0.5-1.0 MPa to dissolve out lignin; centrifugally separating to obtain a DES solvent solution containing lignin and a solid precipitate containing cellulose and hemicellulose; filtering the DES solvent solution containing lignin through a ceramic membrane, and drying to obtain a lignin product; treating the solid precipitate with a hydrogen peroxide solution, carrying out solid-liquid separation, washing and drying to obtain a cellulose product; and combining the separation liquid and the washing liquid, concentrating, adding ethanol for precipitation, and drying to obtain a hemicellulose product. According to the invention, step-by-step efficient separation of three elements is realized, and the separation efficiency and the product purity are improved.