Abstract:
A method for separating a hydroxyalkyl monoacrylate and an alkanediol diacrylate is provided to improve the selectivity by using a two-component extraction solvent. A method for separating a hydroxyalkyl monoacrylate and an alkanediol diacrylate comprises the step of supplying water to the upper part of an extraction tower and cyclohexane to the lower part to separate 4-hydroxybutyl acrylate and 1,4-butanediol diacrylate generated by the esterification of acrylic acid and 1,4-butanediol in the presence of an acid catalyst by using water and cyclohexane as an extraction solvent, wherein the ratio of water and cyclohexane is 10:1 to 1:10; the supply amount of water is 5-50 mL/min based on the extraction tower of volume 1,500 mL; and the supply amount of cyclohexane is 5-50 mL/min based on the extraction tower of volume 1,500 mL.
Abstract:
A method for synthesizing carbon nanotubes using ultra sonic evaporation is provided to enable quantitative control, synthesize a high purity of uniform-size carbon nanotubes in a low cost, and control the shape of carbon nanotubes easily. A method for synthesizing carbon nanotubes using ultra sonic evaporation includes a step of supplying a metal catalyst-liquid mixture using an apparatus for synthesizing carbon nanotubes, a step of vaporizing the mixture supplied to a syringe pump(11) by ultra sonic vibrations, and a pyrolytic step. The apparatus for synthesizing carbon nanotubes comprises an ultra sonicator(21), a syringe pump(11), a heater(42), a filter part(51), and a gas supply part. In the pyrolytic step, a concentration of a metal catalyst for controlling the shape and structure of carbon nanotubes is controlled according to the metal catalyst-liquid mixture obtained by adding 1.5-6.5mol% of metal catalyst particles to a liquid carbon source.
Abstract:
Provided is a method for preparing 4-hydroxybutyl acrylate used as a material for preparing a paint for the top coating of automobiles, with high yield and high selectivity. A method comprises the step of reacting acrylic acid and 1,4-butanediol with a cation exchange resin catalyst as a solid acid catalyst to prepare 4-hydroxybutyl acrylate, wherein the amount of acrylic acid, 1,4-butanediol and the cation exchange resin catalyst are 55-65 wt%, 34-45 wt% and 0.4-1.7 wt%, respectively. The cation exchange resin catalyst is any one selected from Amberlyst 15 (wt) catalyst or Amberlyst 15 (dry) (Rohm and Hass). Preferably the reaction is carried out at a temperature of 100-110 deg.C.
Abstract translation:本发明提供一种高收率,高选择性地制备作为汽车面漆用涂料的原料的丙烯酸4-羟丁酯的制造方法。 一种方法包括使丙烯酸和1,4-丁二醇与作为固体酸催化剂的阳离子交换树脂催化剂反应以制备丙烯酸4-羟丁酯的步骤,其中丙烯酸,1,4-丁二醇和阳离子交换树脂 催化剂分别为55-65重量%,34-45重量%和0.4-1.7重量%。 阳离子交换树脂催化剂是选自Amberlyst 15(wt)催化剂或Amberlyst 15(干燥)(Rohm and Hass)中的任何一种。 优选反应在100-110℃的温度下进行。
Abstract:
본 발명은 니켈계의 수증기개질용 촉매가 금속모노리스에 코팅된 형태의 수증기개질 구조촉매를 제공한다. 또한 본 발명은 상기 촉매를 이용하여 탄화수소와 수증기를 촉매와 접촉시켜 수증기개질 반응에 의해 수소를 제조하는 것을 특징으로 하는 수소 제조 방법을 제공한다.
Abstract:
본 발명은 공기 중에서 질소를 선택적으로 흡착하는 제올라이트 분자체를 흡착제로 충진한 흡착탑을 압력변동흡착법으로 운전하여 공기로부터 질소를 농축하여 제조하는 방법에 있어서, 공기중의 CO 2 와 수분을 제거하는 전처리공정에 2개의 전처리탑을 사용하고 전처리공정에서 정제된 공기를 도입하여 질소를 농축, 분리하는 주분리공정에 제올라이트 분자체가 충진된 2개의 질소분리탑을 사용하여 전처리 공정의 한주기가 주분리공정의 두 주기가 되게 운전하면서 제품질소 순도가 낮은 경우에 생산성을 향상시킨 압력변동흡착식 질소제조장치에 관한 것으로서 전처리 공정은 순차적으로 승압스텝-흡착스텝-감압스텝-일차 세정스텝-휴지스텝-이차 세정스텝으로 이루어지고, 주분리공정은 순차적으로 승압스텝-흡착스텝-세정스텝-탈착스텝으로 구 성되어 있으며 주분리공정의 흡착스텝과 세정스텝의 배가스가 전처리탑의 세정에 사용된다.
Abstract:
본발명은슬러리기포탑반응기를이용한경유및 휘발유고함량합성연료의제조방법에관한것으로, 본발명에서는기존에저온 FT 반응에주로적용하는슬러리기포탑반응기(SBCR)를고온에서운전하여왁스의생산보다경유또는휘발유함량이증가된피셔트롭시합성반응생성물을생산할수 있는최적공정을제공할수 있다.
Abstract:
본발명은슬러리기포탑반응기를이용한경유및 휘발유고함량합성연료의제조방법에관한것으로, 본발명에서는기존에저온 FT 반응에주로적용하는슬러리기포탑반응기(SBCR)를고온에서운전하여왁스의생산보다경유또는휘발유함량이증가된피셔트롭시합성반응생성물을생산할수 있는최적공정을제공할수 있다.