Abstract:
PURPOSE: An improved method for preparing mesoporous crystalline molecular sieve having large pore size and superior hydrothermal stability is provided. CONSTITUTION: The method for preparing mesoporous crystalline molecular sieve comprises the steps of a) preparing a first solution by dissolving 2 to 20 weight parts of silica alone or a mixture of silica and a metal salt or metal alkoxide into 100 weight parts of a hydrogen fluoride solution having concentration of 5 to 50%, wherein a mole ratio of Si/metal is 10 or more; b) preparing a second solution by dissolving 2 to 12 weight parts of cationic surfactant into 100 weight parts of distilled water; c) uniformly mixing the solutions by adding the first solution to the second solution in a weight ratio of 1 to 2:1 (second solution/first solution), and preparing powder by filtering and drying the aged solution after aging the resulting solution at a temperature of 25 to 80 deg.C for 10 to 18 hours by adding 20 to 30 weight parts of concentrated aqueous ammonia (based on 100 weight parts of the hydrogen fluoride solution) to the mixed solution; and d) adding the powder to 200 to 300 weight parts (based on 100 weight parts of the hydrogen fluoride solution) of an ethanol acidic solution, and calcining the resulting material at a temperature of 300 to 600 deg.C for 2 to 4 hours.
Abstract:
PURPOSE: A method for preparing the graft polymer of a polyvinylidene fluoride resin and an acryl derivative and its polymerization apparatus are provided to use little solvent, to reduce the reaction time, to improve the graft rate and to modify the surface of the polymer. CONSTITUTION: The method comprises the steps of putting a solid polyvinylidene fluoride resin supplying the main chain of a linear polymer into a solid state polymerization reactor; purging nitrogen gas to remove the oxygen present in the reactor; heating the temperature to 90-120 deg.C; injecting a solid state initiator to generate radicals at the polymerization reaction temperature; spraying a liquid acryl derivative in the state of aerosol; and reacting it at the polymerization reaction temperature for 10-50 min after the injection of an initiator. Preferably the initiator is benzoyl peroxide, and the acryl derivative is selected from the group consisting of acrylic acid, methacrylic acid and glycidyl methacrylate.
Abstract:
티오우레아의 부가를 반복부가하지 않으면서 납사분해잔사유로부터 다이메틸에틸벤젠을 고순도, 고수율로 연속 분리하는 방법과 그 분리장치를 제공함을 제1의 목적으로 하고, 용매와 티오우레아를 회수하여 재사용함을 제2의 목적으로 한다. 납사분해중유를 비점차를 이용하는 저비점탄화수소 분리기(1)와 고비점탄화수소분리기(2)를 통해 분리, 40∼90wt%로 농축된 다이메틸에틸벤젠을 결정화기(5)에 주입하고 이에 포화된 티오우레아 용액 및 용제를 넣고 이에 포접촉진제를 가하거나 가하지 않고 가온, 균일 액상으로 만든 후, 이를 냉각하여 이 포접결정체를 잔여액과 분리한 후 포접결정체를 건조후 스팀으로 용해하고 상분리하여서 된 납사분해중유로부터 다이메틸에틸벤젠을 고순도, 고수율로 연속 분리방법과 그 분리장치이다.
Abstract:
PURPOSE: To separate volatile organic compounds from waste stream effectively, a hybrid membrane which is composed of porous membrane layer and non-porous membrane layer is provided. The porous membrane layer has the ability of concentration and has an effect on the characteristic of separation, whereas the non-porous membrane layer has the ability of purification and an affinity for volatile organic compounds. The hybrid membrane can improve the effectiveness of separation by picking out the merits of porous and non-porous membrane layers. CONSTITUTION: The hybrid membrane comprises a porous membrane layer which has the ability of concentration and a non-porous membrane layer which is coated with macromolecules that have an affinity for volatile organic compounds. On one side of the porous layer, a solution containing fillers, including aluminum nitrate, aluminum sulfate, calcium chloride and polyethylene oligomer, is applied, whereas on the other side of the porous layer, negative pressure of 5-300 torr is applied. After forming a porous layer on one side, polydimethyl siloxane oligomer is applied the other side so that a non-porous layer is formed.
Abstract:
본 발명은 고 투과성 역삼투압 분리막의 제조방법에 관한 것으로서, 더욱 상세하게는 다공성 지지체막 위에 비다공성의 폴리아마이드 박막이 도포되어 있는 복합막 형태의 분리막을 제조함에 있어, 지지체와 폴리아마이드 박막간의 결합력을 크게하여 고 내구성을 보유하도록 하기 위해서 지지체를 특정 결합제 용액으로 전처리한 후 확립한 도포용액 속에 일정시간 동안 담구어 표면 중합법에 의해 고 투과성의 폴리아마이드 활성층을 형성시켜 복합막을 제조하며, 또한 제조된 복합막을 아민류, 알코올류 또는 산류 등이 함유되는 용액속에서의 후처리를 통하여 막의 친수 특성을 증가시킴으로써 음용수 제조 및 공업용수 분리 정제를 저압 하에서도 효과적으로 수행 가능하도록 하는 고 내구성 및 고 투과성을 가지는 역삼투압 중공사 분리막의 제조 방법에 관한 것이다.
Abstract:
본 발명은 비다공성막을 통과하는 투과물의 투과특성 측정방법 및 측정장치에 관한 것으로서, 투과물의 확산계수 및 용해계수, 투과속도, 투과물의 조성등을 동시에 분석할 수 있고, 투과거동 및 속도론(Kinetics)연구에 대한 새로운 해석을 제시할 수 있는 등 다양한 연구 수행을 용이하게 할 수 있도록 한 것이다. 이에, 본 발명은 비다공성 고분자막을 통하는 액체, 증기 및 기체상의 투과물질에 대한 투과특성, 즉 투과속도와 투과농도등을 정상상태 뿐만아니라 비정상상태에서도 시간에 따른 변화 형태로 정확하고 신뢰성 있게 측정 및 분석 할 수 있도록 한 온라인 방식의 비다공성막을 통과하는 투과물의 투과특성 측정방법 및 측정장치를 제공하고자 한 것이다.
Abstract:
PURPOSE: A method for preparing slow-releasing chitosan fine capsule having a biodegradable membrane is provided which is able to provide the chitosan fine capsule having hydrophilic property and good stability and is easily control the capsule size and also possible to prepare the ultrafine capsule having a size of nanometer unit. CONSTITUTION: A slow-releasing chitosan fine capsule having a biodegradable membrane is prepared by: (i) preparing emulsion 1 by adding high molecular aqueous solution containing 0.3-10 wt.% of chitosan and 0.1-2 wt.% of acetic acid to an emulsifying solution; (ii) preparing emulsion 2 by adding an aqueous solution of cross link agent containing 0.5-10 volume% of sulfuric acid and 1-50 volume% of glutaraldehyde to an emulsifying solution; and (iii) mixing the emulsion 1 and the emulsion 2 in an equal amount ratio to form fine capsule by the interfacial emulsification between the high molecular chitosan and the cross link agent.
Abstract:
PURPOSE: A preparation method of a micro capsule containing hydrophilic polymer membrane by dispersing a hydrophilic polymer solution in an organic solvent and cross link-reacting with a cross link agent and a catalyst is provided which gives a capsule having a stable membrane and a diameter less than scores micrometer. CONSTITUTION: A micro capsule having a diameter of 0.5-50 micrometer and containing a hydrophilic polymer membrane is manufactured by dispersing 5-20 vol.% of hydrophilic polymer solution based on an inorganic solvent in the inorganic solvent containing an emulsifying agent in agitating at a speed of 500-15,000 rpm and pouring 0.5-8 vol.% of water-soluble cross link agent based on the inorganic solvent and a cross link-reaction catalyst such as hydrochloric acid, acetic acid or sulfuric acid. 0.3-10 wt.% of Hydrophilic polymer selected from polyvinyl alcohol, polyacrylic acid, sodium alginate and chitosan based on the hydrophilic polymer solution is used.
Abstract:
본 발명은 복합분자체(molecular sieve) 화합물의 제조방법에 관한 것으로서, 더욱 상세하게는 활성탄의 기공내에서 결정성 알루미노실리케이트를 생성시켜 친수 및 친유성 흡착 특성을 동시에 갖고 있어 수처리제, 탈취제, 항균 및 살균제, 유기물 흡착제, 수분 흡착제, 담배필터용 기재, 공기 분리제 등의 폭넓은 용도로 사용되는 복합분자체의 제조방법에 관한 것이다.