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有人提出工业生产回收利用空气中CO2的构想:把空气吹入浓碳酸钠溶液中,溶液可吸收CO2生成碳酸氢钠(NaHCO3);加热碳酸氢钠固体又分解放出CO2;在合成塔内CO2与氢气反应生成甲醇(CH3OH)和水。简要的生产流程如图所示:

(图中:“→”表示流程顺序或步骤,“↓”表示加入原料,“↑”表示生产出得产物,“  ”表示有可循环利用的物质)

【资料卡片】碳酸氢钠分解温度是270℃,碳酸钠在856℃熔化,但还未达到分解温度。

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