Abstract:
PURPOSE: A gas absorbent for purifying exhaust gas is provided to absorb acidic gas such as carbon dioxide and sulfur dioxide and to be used as a separate medium of an absorption method for repetitively separating the gas. CONSTITUTION: A gas absorbent for purifying exhaust gas comprises: cation containing nitrogen atom selected from dialkyl imidazolium and dialkyl morpholinium; and anion containing phosphorous atom selected from alkyl phosphate and dialkyl phosphate. The gas absorbent absorbs carbon dioxide(CO2) or sulfur dioxide(SO2). An alkyl group of the dialkyl imidazolium or the dialkyl morpholinium has hydrogen atom or carbon number 1 ~ 4.
Abstract:
A method is provided to separate and recover pure SO2 only from a gas mixture generated from an IS(Iodine-Sulfur) cycle process even at a high temperature in a stable and succeeding manner through absorption and degassing processes using ionic liquid, and prevent loss of a solvent even in the repeated absorption and degassing processes by maintaining low vapor pressure and high temperature stability as compared with a conventional amine-based absorbent. As a method for separating and recovering sulfur dioxide from a gas mixture containing 40 to 80 wt.% of sulfur dioxide(SO2) and 20 to 60 wt.% of oxygen exhausted from an IS(Iodine-Sulfur) cycle process consisting of a decomposition reaction of sulfuric acid, a decomposition reaction of sulfur dioxide, and a decomposition reaction of iodic acid, a method for separating and recovering pure sulfur dioxide from the gas mixture in the IS cycle process using ionic liquid comprises the steps of: contacting the gas mixture with ionic liquid to allow the ionic liquid to absorb and separate sulfur dioxide(SO2) in the gas mixture in a temperature range of 20 to 50 deg.C; and degassing the sulfur dioxide that has been absorbed and separated from the gas mixture from the ionic liquid in a temperature range of 120 to 250 deg.C. The ionic liquid is ionically bonded compounds in which cations selected from imidazolium, pyrrolidinium, piperidinium, morpholinium and pyridinium are bonded with anions selected from hydrogen sulfate(HOSO3^-), methyl sulfate(CH3OSO3^-), ethyl sulfate(C2H6OSO3^-)methane sulfonate(CH3SO3^-), acetate(CH3COO^-), tetrafluoroborate(BF4^-), hexafluorophosphate(PF6^-), and chloride(Cl^-), or mixtures of the ionically bonded compounds. Further, the recovered sulfur dioxide has a recovery rate of 85 to 95% and purity of 98 to 99%.
Abstract:
본 발명은 폴리카보네이트, 폴리에스테르, 폴리염화비닐 등으로 된 유기고분자 멤브레인을 불소가 함유된 가스로 처리하여 표면 특성을 개질하는 방법에 관한 것으로, 장시간 사용해도 여과 성능이 저하되지 않도록 불소가스와 비활성가스의 혼합가스로 친수성으로 개질하는 방법을 제공하는 것이 목적이다. 본 발명의 유기고분자 멤브레인 표면의 친수화 개질방법은 (a) 멤브레인을 세척하여 건조시키는 단계와, (b) 불소가스와 질소, 헬륨, 아르곤 등의 희석가스와 혼합하여 원하는 농도의 혼합가스를 만드는 단계와, (c) 불소를 함유하는 혼합가스로 멤브레인을 개질 반응시키는 단계를 포함한다. 수처리용 유기고분자 멤브레인의 표면을 불소화 개질하면 원래의 유기고분자 멤브레인보다 전기적으로 음성을 띄는 친수성 표면을 형성할 수 있고, 따라서 더 높은 물 투과도를 얻을 수 있으며, 동시에 콜로이드 입자에 의한 막 오염 현상에 대한 저항성이 증가하여 오래 동안 효과적으로 콜로이드 수용액을 여과할 수 있다.
Abstract:
PURPOSE: A method for preparing glycerol carbonate from glycerol and urea is provided to obtain glycerol carbonate of high yield. CONSTITUTION: A method for preparing glycerol carbonate comprises a step of reaction of glycerol and urea using a halogen or nitrate ion-coordinated zinc catalyst of chemical formula 1(ZnX). In chemical formula 1, X is F, Cl, Br, I or NO_3. The reaction is performed at 100-170 Deg. C. for 0.5-5 hours. The glycerol is crude glycerol.
Abstract translation:目的:提供从甘油和尿素制备甘油碳酸酯的方法,以获得高产率的甘油碳酸酯。 构成:制备甘油碳酸酯的方法包括使用化学式1(ZnX)的卤素或硝酸根离子配位的锌催化剂反应甘油和尿素的步骤。 在化学式1中,X是F,Cl,Br,I或NO 3。 反应在100-170度进行。 C. 0.5-5小时。 甘油是粗甘油。
Abstract:
본발명은함불소올레핀을포함한이미다졸륨계이온성액체화합물을이용한이산화탄소흡수제에관한것으로, 본발명에따른함불소올레핀을포함한이미다졸륨계이온성액체화합물은자체의증기압이아주낮고, 열적, 화학적안정성이뛰어나며, 우수한이산화탄소흡수능을보유하고있을뿐만아니라, 흡수된이산화탄소의탈기도비교적낮은온도에서수행할수 있으며, 반복사용시에도흡수능의감소가거의없어이산화탄소흡수제로서효과적으로사용될수 있다.