Knetics and product distributions of cellulose decomposition in near-critical water were studied with a continuous flow-type apparatus for supercritical and near-critical water reactions.The experimental temperature r...Knetics and product distributions of cellulose decomposition in near-critical water were studied with a continuous flow-type apparatus for supercritical and near-critical water reactions.The experimental temperature range was from 513?K to 583?K and residence time from 0.5?min to 1.6?min.The effects of temperature and residence time on cellulose residue were demonstrated.The apparent actiation energy evaluated was 147?kJ·mol -1 .In addition,the effects of temperature and residence time on the yield distributions of wter soluble oligomers,glucose and levulose,pyruvic aldehyde,5-hydroxymethyl furfural,furfural were described in detail.The experimental results showed that selective decomposition of cellulose in near critical water was possible.展开更多
The kinetics of hydrolysis of olive oil,peanut oil,soybean oil,safflower oil in near-critical water was systematically determined in the temperature range from 170℃ to 240℃ and at pressure of 10 MPa.From the results...The kinetics of hydrolysis of olive oil,peanut oil,soybean oil,safflower oil in near-critical water was systematically determined in the temperature range from 170℃ to 240℃ and at pressure of 10 MPa.From the results,it could be seen that the vegetable oil hydrolysis in near-critical water was a typical self-catalyzed reaction.With a second-order kinetics equation,the activation energies evaluated were 41.8 kJ·mol-1 for olive oil,37.3 kJ·mol-1 for peanut oil,37.7 kJ·mol-1 for soybean oil,31.2 kJ·mol-1 for safflower oil respectively.The activation energies of different vegetable oils had a close relationship with their iodine values.With increasing iodine value,the activation energy of vegetable oil hydrolysis in near-critical water decreased.展开更多
文摘Knetics and product distributions of cellulose decomposition in near-critical water were studied with a continuous flow-type apparatus for supercritical and near-critical water reactions.The experimental temperature range was from 513?K to 583?K and residence time from 0.5?min to 1.6?min.The effects of temperature and residence time on cellulose residue were demonstrated.The apparent actiation energy evaluated was 147?kJ·mol -1 .In addition,the effects of temperature and residence time on the yield distributions of wter soluble oligomers,glucose and levulose,pyruvic aldehyde,5-hydroxymethyl furfural,furfural were described in detail.The experimental results showed that selective decomposition of cellulose in near critical water was possible.
文摘The kinetics of hydrolysis of olive oil,peanut oil,soybean oil,safflower oil in near-critical water was systematically determined in the temperature range from 170℃ to 240℃ and at pressure of 10 MPa.From the results,it could be seen that the vegetable oil hydrolysis in near-critical water was a typical self-catalyzed reaction.With a second-order kinetics equation,the activation energies evaluated were 41.8 kJ·mol-1 for olive oil,37.3 kJ·mol-1 for peanut oil,37.7 kJ·mol-1 for soybean oil,31.2 kJ·mol-1 for safflower oil respectively.The activation energies of different vegetable oils had a close relationship with their iodine values.With increasing iodine value,the activation energy of vegetable oil hydrolysis in near-critical water decreased.
