Patent ID: 11926537
Assignee: JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 0:
1. A preparation method of a crop straw-based seawater desalinator, comprising the following steps: step 1, crushing the sorghum straw and screening the crushed straw through a 200-mesh sieve to obtain sorghum straw powder; step 2, putting the sorghum straw powder into a tube furnace, calcining the powder at a high temperature under the nitrogen protection, heating the powder rapidly up to 450° C. at a rate of 5° C./min, performing heat preservation for 5 h, cooling the power naturally down to 25° C., screening the power through a 200-mesh sieve, putting the powder into a ball milling tank, placing 42, 4 and 2 zirconia balls with diameters of 2 mm, 8 mm and 10 mm into the tank respectively, and performing ball milling in a ball mill for 5 h with a rate of 300 rpm to obtain ball-milled biochar; step 3, taking 10 g of the straw powder obtained in the step 1, adding 200 g of sodium hydroxide solution with a concentration of 10 wt % to obtain a mixture, stirring the mixture for 5 h at a temperature of 180° C. to obtain a reactant, pouring the reactant after cooling down into a centrifuge tube and centrifuging at a rotation speed of 8000 rpm for 20 min; and taking out a viscous product at the lower layer; and step 4, mixing the viscous product obtained in the step 3 with 0.1 g of the ball-milled biochar obtained in the step 2 to obtain a mixture, stirring the mixture for 10 min at a rate of 100 rpm, and uniformly shaking before being put into a mold; and finally, freezing the mixture in a refrigerator at a temperature of −4° C. for 6 h, and drying in a freeze dryer at a temperature of −80° C. for 24 h to obtain a straw-based evaporator.