Vol.11 no.3 2019
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Research paper : High-value materials from incineration residues of burnable garbage (N. FUKAYA et al.)−127−Synthesiology - English edition Vol.11 No.3 (2018) process was designed to remove water continuously during the reaction by installing a water removal unit in the reaction system. This enables conversion to useful chemical products through direct reaction, even for SiO2 that is a substance for which chemical conversion is normally difficult since it is an extremely stable oxide. Since the molecular sieve, or the inorganic desiccant used here, is solid, it can be easily recovered after the reaction and used repeatedly after heating and evacuation. This is advantageous for reducing manufacturing costs (Fig. 5).[3]–[6]As a starting material containing silica, the following materials were used: sand (obtained by crushing siliceous shale from Natsudomari Penninsula, Aomori Prefecture), incineration ash (remains of burning chaff and straw), and an industrial by-product (silica produced as a by-product 72 %95 % or moreIndustrial by-productsb72 %84 %Incineration ash from straw78 %93 %Incineration ash from cha51 %90 %SandaTetraethoxysilane yieldPurity of silica in raw materialsRaw material containing silicaNext-generation eco-tireAerospace high heat-resistant materialsNext-generation high-capacity hard diskCosmeticsNew technologyConventional methodEnergy savingsCost reductionSand (silica)ReductionMetallic siliconOxidationTetraalkoxysilaneFoundation materialOrganic silicon materialAutomobile membersLED sealantSealing agentSolar power generation membersFig. 4 Manufacture of organic silicon material from sand (SiO2), and various product groups that contain organic silicon materialsTable 1. Results of direct synthesis of tetraethoxysilane from various natural materialsSiO2+4ROHSi(OR)42H2O+Incineration ashChaCrushed sandSiliceous shaleRemoval from reaction systemInorganic desiccant that can be easily separated, recovered, and reusedVarious silicon raw materials that are inexpensive and abundantWaterTetraalkoxysilaneAlcoholSilicaFig. 5 Direct synthesis of organic silicon material using silica as raw materiala: Obtained by crushing siliceous shale from Natsudomari Penninsula, Aomori Prefecture (provided by Asaka Riken Co., Ltd.)b: Silica produced as by-product of synthetic quartz manufacturing (provided by CoorsTek K.K.)

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