Xylose crystal was obtained from cottonseed hull by the ethanol solventing-out crystallization process.The crystal was analyzed and determined by infrared spectrometer (IR),melting point tester,environmental scanning ...Xylose crystal was obtained from cottonseed hull by the ethanol solventing-out crystallization process.The crystal was analyzed and determined by infrared spectrometer (IR),melting point tester,environmental scanning electron microscope (ESEM),high performance liquid chromatography (HPLC),and particle analyzer.The results showed that this xylose crystal is similar to that came from corncob in the IR spectroscopy and melting point,but their shape is different,the former likes long prism and the later is square.Under the optimized operation conditions,the purity of the crystal could be up to 99.64%(mass),and the yield 77.6%.The particle size at mediam is 151 μm with the variation 47%.These data indicate that ethanol solventing-out crystallization can be an industrial potential method for production of xylose.展开更多
A new production technology of high-quality trimellitic anhydride with the liquid-phase air-oxidation from 1,2,4-trimethylbenzene was developed.A dehydration column evaporator was used in the process for guaranteeing ...A new production technology of high-quality trimellitic anhydride with the liquid-phase air-oxidation from 1,2,4-trimethylbenzene was developed.A dehydration column evaporator was used in the process for guaranteeing an optimized experimental condition for 1,2,4-trimethylbenzene oxidation.A high quality crystalline trimellitic anhydride with more than 99% purity was obtained by the use of a new electromagnetic frequency inductively coupled bidirectional heater and a nano-filter in the process, resulting in the reduction of side reactions and elimination of insoluble impurities.The merits of low unit consumption, high quality product and less environmental pollution demonstrate its potential application to non-hazardous and environmental friendly production.展开更多
文摘Xylose crystal was obtained from cottonseed hull by the ethanol solventing-out crystallization process.The crystal was analyzed and determined by infrared spectrometer (IR),melting point tester,environmental scanning electron microscope (ESEM),high performance liquid chromatography (HPLC),and particle analyzer.The results showed that this xylose crystal is similar to that came from corncob in the IR spectroscopy and melting point,but their shape is different,the former likes long prism and the later is square.Under the optimized operation conditions,the purity of the crystal could be up to 99.64%(mass),and the yield 77.6%.The particle size at mediam is 151 μm with the variation 47%.These data indicate that ethanol solventing-out crystallization can be an industrial potential method for production of xylose.
文摘A new production technology of high-quality trimellitic anhydride with the liquid-phase air-oxidation from 1,2,4-trimethylbenzene was developed.A dehydration column evaporator was used in the process for guaranteeing an optimized experimental condition for 1,2,4-trimethylbenzene oxidation.A high quality crystalline trimellitic anhydride with more than 99% purity was obtained by the use of a new electromagnetic frequency inductively coupled bidirectional heater and a nano-filter in the process, resulting in the reduction of side reactions and elimination of insoluble impurities.The merits of low unit consumption, high quality product and less environmental pollution demonstrate its potential application to non-hazardous and environmental friendly production.
