The separation of acetone-tetrahydrofuran mixtures is often faced in the pharmaceutical and special chemical industries. As acetone and tetrahydrofuran can form a minimum azeotrope, they cannot be separated by conventional distillation. But acetone and tetrahydrofuran are important organic raw materials and solvents, so the mixture should be separated for reuse.

ResultsThe process of continuous extractive distillation was used to separate the mixture of acetone (62% mass fraction) and

tetrahydrofuran (38% mass fraction) using butyl ether as solvent. learn more The characteristics of the continuous extractive distillation were simulated via ASPEN and experiments also showed the feasibility of separating the acetone-tetrahydrofuran mixture. Effects of the reflux mass ratio (R),

mixture feed stage (FS), the solvent feed stage (SFS) on the extractive distillation column and the volume ratio of solvent to mixture (S/F) on the distillate mass fraction of acetone and bottom product mass fraction of acetone FRAX597 research buy were investigated. The results of the extractive distillation simulation were verified by experiment data. With the following operation conditions for the extractive distillation column: number of theoretical plates53; mixture feed at 24th plate; solvent feed at 7th plate, solvent to mixture ratio 3 and reflux mass ratio 3, the mass fraction of acetone in the distillate can reach 99%.

ConclusionsThe process of continuous extractive distillation using butyl ether as solvent can separate the acetone-tetrahydrofuran Raf activation mixture. The solvent to mixture ratio and reflux mass ratio are important factors that affect

the mass fraction of the product. (c) 2013 Society of Chemical Industry”
“Nearly zero magnetostrictive microwires have been proven to be very versatile, due to their extremely soft magnetic properties, the changes in their magnetization mechanism with dimensions, and the appearance of sensitive application-related effects, such as the large Barkhausen and the giant magnetoimpedance effects. Their sensitive magnetoimpedance response originates in the specific domain structure, composed of an inner core and an outer shell (OS), since the OS with a circumferential easy axis is the main region involved in the magnetoimpedance effect. The circumferential OS is believed to display a bamboolike structure with consecutive rings circumferentially magnetized in opposite directions. However, earlier theoretical studies predicted a uniformly magnetized OS as being energetically favored. This paper aims to clarify this contradiction. The variation of the magnetostatic energy from the bamboo domain to the uniformly magnetized state has been calculated and it has been found to be null. Therefore, a uniformly magnetized OS has lower energy due to the absence of domain walls.