142results about How to "Less discharge of three wastes" patented technology

The invention provides a method of producing L-arabinose by a xylose mother liquid. The method comprises the following steps: first, diluting the xylose mother liquid; then, removing glucose by active dry yeast powder; further refining the xylose mother liquid through decoloration, ion exchange and evaporation concentration; then obtaining an L-arabinose component solution and a xylose component solution through a continuous chromatographic mobile bed and respectively crystallizing to obtain an L-arabinose product and a xylose product. The method provided by the invention extracts L-arabinose through the continuous chromatographic mobile bed by using a byproduct xylose mother liquid in production of crystallized xylose by bagasse, is simple in operation, low in technical cost and good in separating effect, and has an extremely wide application valve. The obtained L-arabinose is high in purity and yield.

The invention relates to 2-imidazolidone, and provides a 2-imidazolidone synthesis method simple in process and low in cost. The method includes: (1) sequentially adding a catalyst of sulfamic acid, a solvent of methyl alcohol, ethylenediamine and dimethyl carbonate into a heatable reactor for reacting at the temperature of 20-80 DEG C for 1-5 hours; (2) continuously raising the temperature to 120-180 DEG C, and reacting for 10-24 hours prior to generating a target product 2-imidazolidone; (3) after reaction is ended, filtering to remove the catalyst of sulfamic acid and remove the solvent of methyl alcohol so as to obtain a coarse product 2-imidazolidone; (4) refining the coarse product 2-imidazolidone obtained in the step (3) to obtain the product 2-imidazolidone. The defects that an existing synthesis process is carried out at high temperature under high pressure, high-corrosivity catalysts, toxic materials and high boiling solvent are used, atom utilization rate is low and the like are overcome.

The invention discloses a preparation method of 2-azabicyclo(2.2.1)hept-5-alkene-3-ketone, which is an intermediate for the synthesis of antiviral medicine carbonyl ring nucleoside, which is characterized in that, an aqueous solution prepared by anhydrous sodium sulfite and sodium bicarbonate is added to a reactor; the temperature is controlled between 0 to 60 DEG C; a fixed amount of methanesulfonyl chloride is added by dropping, and the temperature is maintained to react for 2 to 4 hours to prepare methyl sulfonate solution; a fixed amount of ether solvent is added to the solution, and under a temperature ranging from 10 to 60 DEG C, cyanogens chloride is added; after 4 to 6 hours reaction, cyclopentadienyl is added by dropping; the pH value of the reaction solution is controlled between 1.5 to 3 to react for 3 to 5 hours; then sodium hydroxide is used for regulating the pH value to 7 to 9; after standing, the ether solvent is separated, and a fixed amount of methyl chloride is used for separated extraction 2-azabicyclo(2.2.1)hept-5-alkene-3-ketone; the methyl chloride is distilled and a crude product is obtained; the crude product is decolorized by activated carbon and recrystallized in ether solvent; 2-azabicyclo(2.2.1)hept-5-alkene-3-ketone with a purity of more than 99.6 percent is obtained after drying. The preparation method has the advantages of rich raw material sources, low cost, simple technological process, small emission of three wastes, benefits for industrial production and other advantages.