[Objectives]The differences in indices of different peanut oil were found out by analyzing the quality of peanut oil obtained by different oil-making processes.[Methods]The effects of different oil-making processes on...[Objectives]The differences in indices of different peanut oil were found out by analyzing the quality of peanut oil obtained by different oil-making processes.[Methods]The effects of different oil-making processes on the quality of peanut oil were analyzed and compared through the determination of the main physicochemical indices,V_(E) contents and fatty acid compositions of peanut oil obtained by cold pressing,hot pressing and leaching and refining.[Results]The leached refined peanut oil had the lightest color and the lightest fragrance;the hot-pressed peanut oil had the highest V_(E) content;the refractive index,relative density and main fatty acid compositions of the three kinds of peanut oil had no significant differences;and there were trans-fatty acids in the leached refined peanut oil,and the trans-fatty acid contents in the leached refined fresh and aged peanut oil were 1.90%and 4.39%,respectively.The trans-fatty acid content is expected to be a characteristic index to distinguish pressed peanut oil from leached refined peanut oil.[Conclusions]This study can provide a theoretical basis for distinguishing and identifying peanut oil obtained from different oil-making processes.展开更多
Gas injection is the second largest enhanced oil recovery process, next only to the thermal method used in heavy oil fields. To increase the extent of the reservoir contacted by the injected gas, the gas is generally ...Gas injection is the second largest enhanced oil recovery process, next only to the thermal method used in heavy oil fields. To increase the extent of the reservoir contacted by the injected gas, the gas is generally injected intermittently with water. This mode of injection is called water-alternating-gas (WAG). This study deals with a new immiscible water alternating gas (IWAG) EOR technique, “hot IWAG” which includes combination of thermal, solvent and sweep techniques. In the proposed method CO2 will be superheated above the reservoir temperature and instead of normal temperature water, hot water will be used. Hot CO2 and hot water will be alternatively injected into the sand packs. A laboratory test was conducted on the fractured and conventional sand packs. Slugs of water and CO2 with a low and constant rate were injected into the sand packs alternatively; slug size was 0.05 PV. Recovery from each sand pack was monitored and after that hot water and hot CO2 were injected alternatively under the same conditions and increased oil recovery from each sand pack and breakthrough were measured. Experimental results showed that the injection of hot WAG could significantly recover residual oil after WAG injection in conventional and fractured sand packs.展开更多
文摘[Objectives]The differences in indices of different peanut oil were found out by analyzing the quality of peanut oil obtained by different oil-making processes.[Methods]The effects of different oil-making processes on the quality of peanut oil were analyzed and compared through the determination of the main physicochemical indices,V_(E) contents and fatty acid compositions of peanut oil obtained by cold pressing,hot pressing and leaching and refining.[Results]The leached refined peanut oil had the lightest color and the lightest fragrance;the hot-pressed peanut oil had the highest V_(E) content;the refractive index,relative density and main fatty acid compositions of the three kinds of peanut oil had no significant differences;and there were trans-fatty acids in the leached refined peanut oil,and the trans-fatty acid contents in the leached refined fresh and aged peanut oil were 1.90%and 4.39%,respectively.The trans-fatty acid content is expected to be a characteristic index to distinguish pressed peanut oil from leached refined peanut oil.[Conclusions]This study can provide a theoretical basis for distinguishing and identifying peanut oil obtained from different oil-making processes.
文摘Gas injection is the second largest enhanced oil recovery process, next only to the thermal method used in heavy oil fields. To increase the extent of the reservoir contacted by the injected gas, the gas is generally injected intermittently with water. This mode of injection is called water-alternating-gas (WAG). This study deals with a new immiscible water alternating gas (IWAG) EOR technique, “hot IWAG” which includes combination of thermal, solvent and sweep techniques. In the proposed method CO2 will be superheated above the reservoir temperature and instead of normal temperature water, hot water will be used. Hot CO2 and hot water will be alternatively injected into the sand packs. A laboratory test was conducted on the fractured and conventional sand packs. Slugs of water and CO2 with a low and constant rate were injected into the sand packs alternatively; slug size was 0.05 PV. Recovery from each sand pack was monitored and after that hot water and hot CO2 were injected alternatively under the same conditions and increased oil recovery from each sand pack and breakthrough were measured. Experimental results showed that the injection of hot WAG could significantly recover residual oil after WAG injection in conventional and fractured sand packs.
