(1) vacuum distillation of butyl acetate with an equal volume of sodium carbonate solution (5%) and dried over anhydrous calcium chloride was dried by distillation was added, when the drying time demanding quote ethyl acetate, dried over phosphorous pentoxide may be added, filtration, distillation under a moisture condition. May also be washed with saturated sodium bicarbonate solution was extracted twice, dried over anhydrous magnesium sulfate after distillation. 1- bath; 2-1000 ml Claisen flask; 3- capillary; 4- thermometer; 0 ~ 100 ℃; 5- spherical condenser; 6- receiver; 7- heating ring; 8- pick regulating transformers; 9 - connect the vacuum pump; a, b- two-way piston; c- 500ml three-way piston butyl acetate washed dried placed in a flask, coupling distillation apparatus, opening the piston a, b, c, starting air vacuum extraction within the system Factory direct ethyl acetate, when the inner pressure reaches 7998Pa, the power is turned on water bath, the temperature controlled at 60 ~ 70 ℃ use ethyl acetate, distillation rate, 1 to 2 drops / s, to be distilled off after 50 ~ 60ml, off piston a, the piston c is turned atmosphere, unloaded and bottles, discarded the first paragraph distillate, installed and turned c, so that the receiving bottle with the pump turned on, the distillation continued, when distilled 300 ~ 350ml distilled Stop distillation of liquid, this middle distillate product purification. Note bath temperature should vary depending on the size of the vacuum, distillation rate shall prevail. Because the German astronomer, physicist, according to the Danish astronomer Kepler Tycho Brahe observations between 10-year trajectory for the planet and the star table, by his own observation and analysis, in 1609 ~ 1619 induction has proposed, it refers to Kepler's three laws of planetary motion laws. Kepler's first law, also known as the law of the ellipse; also known as the law of the track: Each planet is along an elliptical orbit around their sun, and the sun is at one focus of the ellipse. Kepler's second law, also known as an area of ??law: equal time in the sun and the planets in motion connection (vector radius) swept the area are equal. This law actually reveals the planets revolve around the sun conservation of angular momentum. Kepler's third law, also known as the harmonic law, also known as the law of the cycle: refers to all the planets around the sun is the focus of ethyl acetate elliptical orbit than the square of its elliptical orbit semi-major axis of the cube and the cycle is a constant. a ^ 3 / T ^ 2 = K, where A is a semi-major axis of planetary orbits, T is the period of revolution of the planet, K is a constant, and its size is only concerned with the quality of the central body. Used to calculate elliptical orbit. Namely: Where,, M is the center of mass of celestial bodies. [1] Linyi ethyl acetate, ethyl acetate, quotes, Xiang dry chemical (certified merchants) by Andrew dry Jinan Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) is specialized in the "glycol" enterprise, the company of "honesty, hard service" concept, to provide you with the most quality products and services. Welcome to inquire! Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_39988355.html), for more information about the company.