NOVELTY - Preparing dihydro geranylacetone involves utilizing (in pts.wt): dihydro aromatic camphor (800-1200), isopropanol (25-35) and aluminum alkoxide, methyl acetoacetate or ethyl acetoacetate (700-820). The dihydro aromatic camphor, isopropanol, aluminum alkoxide are mixed and then the mixed material is heated at 160-200 degrees C. The heated material is added with methyl acetoacetate and ethyl acetoacetate and then the obtained material is incubated for 1.5-3 hours to obtain dihydro geranylacetone. The by-product such as carbon dioxide and methanol gas are cooled.    USE - Method for preparing dihydro geranylacetone (claimed).    ADVANTAGE - The method enables to prepare dihydro geranylacetone in cost-effective, eco-friendly and energy saving manner.    DETAILED DESCRIPTION - Preparing dihydro geranylacetone involves utilizing (in pts.wt): dihydro aromatic camphor (800-1200), isopropanol (25-35) and aluminum alkoxide, methyl acetoacetate or ethyl acetoacetate (700-820). The dihydro aromatic camphor, isopropanol, aluminum alkoxide are mixed and then the mixed material is heated at 160-200 degrees C. The heated material is added with methyl acetoacetate and ethyl acetoacetate and then the obtained material is incubated for 1.5-3 hours to obtain dihydro geranylacetone. The by-product such as carbon dioxide and methanol gas are cooled, filtered and separated to obtain cooled methanol liquid with methanol gas and carbon dioxide gas. The obtained material is performed decarbonylation process into furnace to remove low boiling organic impurity gas. The obtained material is performed combustion reaction to obtain carbon dioxide and water vapor and then the obtained mixture is separated. The obtained material is converted into more than 99% pure carbon dioxide gas and then the carbon dioxide gas is introduced according to need. INDEPENDENT CLAIMS are included for:    (1) a method for preparing dihydro farnesylacetone, which involves utilizing (in pts.wt): dihydro nerolidol (800-1200), aluminum isopropoxide (25-35) and methyl acetoacetate or ethyl acetoacetate (700-820); mixing dihydro nerolidol, aluminum isopropoxide and methyl acetoacetate or ethyl acetoacetate and then heating the obtained material at 160-200 degrees C, adding dropwise methyl acetoacetate or ethyl acetoacetate to the heated material and then incubating the obtained material after addition for 1.5-3 hours to obtain dihydro farnesyl acetone, cooling carbon dioxide gas and methanol produced during the reaction, separating and recovering of resulting liquid-cooled methanol, methanol, carbon dioxide gas and then introducing low-boiling organic impurity gas into the furnace for decarbonylation, where methanol gases and low boiling organic impurities is performed complete combustion after decarbonylation to obtain carbon dioxide and water vapor, separating the obtained mixture and then converting the mixture into more than 99% pure carbon dioxide gas, and introducing the carbon dioxide gas according to need; and    (2) a furnace used for mix pneuma, which comprises combustion chamber, combustion chamber is provided with inner chamber, inner chamber is provided with a mix pneuma inlet and exit, and mix pneuma inlet is connected with electromagnetic control valve.