prov:value
| - fore. [0034] The solvents used in this invention included, but not limited to, water, methanol, ethanol, acetone, and those of water-insoluble or partially water-soluble such as methylene chloride, ethyl acetate, ethyl vinyl ether, dichloromethane, acetaldehyde dimethyl acetal, dioxane, hexane, toluene, and combination thereof. [0035] The present invention also provides a method to produce carbona
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