• Korean Chemical Engineering Research
• /
• v.61 no.4
• /
• pp.619-626
• /
• 2023

Primary and secondary amine-based sorbents were synthesized to investigate the operation capacity for the carbon dioxide separation TSA process. (3-Aminopropyl) triethoxysilane was used as a primary amine precursor as a crosslinking agent to synthesize a secondary amine precursor in which amine groups were crosslinked with a crosslinking agent. Carbon dioxide absorbed by primary amines is completely separated above 170 ℃. The working capacity of the primary amine absorbent was less than 2% when regenerated at 130℃. The secondary amine absorbent has a higher carbon dioxide separation capacity at a lower regeneration temperature than the primary amine absorbent. The secondary amine absorbent could predict process operation performance of about 6.5% with 2% carbon dioxide absorption and 100% carbon dioxide regeneration conditions. Therefore, it was found that the working capacity of the secondary amine absorbent was higher than that of the primary amine.

• KOREAN POULTRY JOURNAL
• /
• v.24 no.1 s.267
• /
• pp.124-127
• /
• 1992

비타민(vitamin)이라는 말은 비타민을 처음 발견한 Casimir Funk에 의해서 명명되었는데 생명체에 없어서는 안될 긴요한(vital) 물질이면서 아미노기(-$NH{_2}$)를 함유하고 있는 아민(amine)이라는 뜻으로 vital amine을 줄여서 vitamine이라고 하였다. 그 뒤에 끝의 e가 없어져서 오늘날에는 vitamin이라고 쓰고 있다. Funk가 처음 발견한 비타민은 오늘날 비타민 $B{_1}$이라고도 불리는 티아민(thiamin)이었으며 모든 비타민을 일시에 발견한 것은 아니다. 티아민이 처음 발견된 후에 수십년에 걸쳐서 많은 사람들에 의해서 여러 가지의 다른 비타민이 발견되어서 오늘날에는 14가지 종류의 비타민이 알려지고 있다. 이중에서 처음으로 발견되었던 티아민이 아민이었기 때문에 비타민이라는 말이 명명되었는데 그 뒤에 다른 비타민들의 화학구조가 밝혀짐에 따라 모든 비타민이 다 아민은 아니라는 사실을 알게 되었다. 그럼에도 불구하고 아직까지 비타민이라는 용어는 그대로 사용하고 있는 것이다.

• The tire
• /
• s.65
• /
• pp.10-17
• /
• 1976

아민계열화방지제(이하 아민이라고 한다)를 첨가한 천연고무 순고무가유물에 대해서 고온으로 반복대신장피로를 주어서 응력변화, 피로수명에 주는 열화방지제의 영향을 조사하였다. 아민첨가시료에 대해서 고온으로 반복 신장피로를 가하면 무첨가시료와 동양, 화학응력 연화가 출현했다. 아민첨가시료의 화학응력연화의 임계온도는 NR-DPG로 110℃, NR-MBTS로 110℃, NR-TT로 130℃이며 가교구조의 내열성에 일치하며 무첨가시료의 임계온도보다도 10~30℃높아졌다. 아민첨가시료의 반복신장피로수명은 60℃로 극대화 되어 (NR-DCP만이 40℃이었으나) 무첨가시료의 피로수명은 40℃에서 극대화됐다. 전보에서 보고한 피로수명과 변형률과의 관계식(F=A(εb-ε)n)은 100℃에서 아민첨가시료에 대해서만이 성립하고 무첨가시료에 대해선 성립되지 않았다. 이들의 결과는 아민을 고무에 첨가함으로써 고무의 열산화반응이 억제되었음에 원인하고 있다고 생각된다.

• The Korean Journal of Pharmacology
• /
• v.29 no.2
• /
• pp.183-188
• /
• 1993

Effects of glucose on the catecholamine release from the hypothalamic fragments in vitro were studied. Basal release of catecholamines was inversely related to the concentrations $(5{\sim}30\;mM)$ of glucose in the incubation medium. Glucose did not affect the 30 mM $K{^+}-stimulated$ release of catecholamine. In the presence of tetrodotoxin $(10\;{\mu}M)$, the inhibitory effect of glucose on the basal release of catecholamines was largely persisted, but the inhibitory effect of 30 mM glucose on dopamine release was largerly blocked. In the presence of both tetrodotoxin $(10\;{\mu}M)$ and desipramine $(3\;{\mu}M)$, glucose failed to affect the basal catecholamine release. The results suggest that glucose modulates the catecholamine release through a direct action on the catecholaminergic nerve terminals, as well as through a trans-synaptical action. The glucose-modulation of the catecholamine release may explain, at least in part, the diabetes-induced changes in the hypothalamic catecholamine metabolism.

• Membrane Journal
• /
• v.25 no.3
• /
• pp.248-255
• /
• 2015

Aminated polyetherimide membrane synthesized in the laboratory according to amine ratio was used for measurement of gas permeability, diffusivity, and solubility about carbon dioxide, nitrogen, methane, oxygen, and sulfur dioxide with Time-lag method at room temperature. Generally, gas permeability is totally decreased because the more amination rate reacted to the main chain of amine groups, the more intermolecular space became narrow. However, gas permeability of sulfur dioxide was increased due to combination of sulfur dioxide and amine groups have acid and base properties respectively. Diffusivity and solubility of dry gas are totally decreased excluding sulfur dioxide as increasing amination rate. In case of sulfur dioxide, however, diffusivity as well as solubility was increased as increasing amination rate. Selectivity of carbon dioxide/nitrogen showed 60 when amination rate was 3. In case of humid gas, gas permeability of carbon dioxide was 70 barrer when relative humidity showed 100, and selectivity with nitrogen approximately showed 18.

• Plant Journal
• /
• v.13 no.2
• /
• pp.34-38
• /
• 2017

To reduce global warming, there are so many studies, investments and efforts. The Post Combustion $CO_2$ Capture technology is one of these efforts. But the technologies are having trouble with reducing operating prices. And CCS technology which is using amine solvent uses high price amine solvent. There is solvent losses naturally when operating plant. The solvent loss makes operating and maintenance price higher. In this study, how the washing column of treated flue gas affects the losses of amine solvent and operating was studied.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.7 no.1
• /
• pp.27-32
• /
• 2006

We separated semiconducting single-walled carbon nanotubes(sem-SWCNT) from the HiPco-SWCNTS by dispersion with octadecylamine(ODA). The mixture of acid-treated SWCWTS and ODA was heated at $120^{\circ}C$ for 120hours. ODA physisorbs selectively on the side-wall of sem-SWCNTS. The ODA-treated CNTs were dispersed in tetrahydrofuran(THF) via sonication. The ODA-physisorbed sem-SWCNT can be retained in the supernatant of THF, but met-SWCNT and unabsorbed sem-SWCNT were precipitated in THF. Raman spectra with 514 nm and 1074 nm were investigated. The amount of sem-SWCNT in the supernatant and precipitant was about 94 % and 50 %, respectively.

• Journal of Korean Society of Environmental Engineers
• /
• v.28 no.5
• /
• pp.527-534
• /
• 2006

The purpose of this study is the development of more effective filter-type polymer adsorbent for removal of anionic pollutants from wastewater. In order to synthesize the polymer adsorbent that possesses anionic exchangeable function, carboxyl(-COOH) group of PP-g-AA nonwoven fabric was converted into amine($-NH_2$) group by the chemical modification using diethylene triamine(DETA). FT-IR data indicate that amine group was introduced into PP-g-AA through amidation of grafted acrylic acid by reaction with DETA. The degree of amination increased with increase in the reaction time and temperature of the chemical modification process, and was significantly improved by the pre-swelling treatment of PP-g-AA with solvent and addition of metal chlorides as a catalyst in following order as $NH_4OH>MeOH{\geq}HCl{\geq}H_2O\;and\;AlCl_3>FeCl_3{\geq}SnCl_2{\gg}ZnCl_2{\geq}FeCl_2$, respectively. However, the addition of catalyst limited the reusability of DETA, hence was less useful from the viewpoint of cost effectiveness and waste management. The anion exchange capacity of the aminated PP-g-AA(PP-g-AA-Am) increased with increase in the degree of amination, but it reached maximum value at the degree of amination as about $50{\sim}60%$. The anion exchange capacity of PP-g-AA-Am was higher than those of commercial anion resins.

• Korean Chemical Engineering Research
• /
• v.54 no.2
• /
• pp.187-199
• /
• 2016

In this study CALPUFF modeling was performed to predict a contribution of a separate single point pollutant source as well as of total point pollutant sources of major synthetic fiber manufacturers in Gumi national industrial complex to atmospheric trimethylamine concentration of the same area. In addition, a contribution of the separate single point pollution source to the atmospheric trimethylamine concentration of the same area was estimated relatively to the total point pollutant sources. As a result of the CALPUFF modeling, the maximum atmospheric concentration of trimethylamine in Gumi national industrial complex was appeared upon improving T company emission facility frequently in complex 3 in winter (January) and spring (April) while frequently in complex 1 in summer (July) and autumn (October). Besides, the predicted range of the maximum atmospheric concentration of trimethylamine in complex 1 was improved upon improving its emission facility. However, even though in complex 3 the upper bound of the predicted maximum atmospheric concentrations of trimethylamine was increased upon improving T company emission facility, the predicted value of their second upper bound below the upper bound was very similar to the upper bound of measured atmospheric trimethylamine concentrations in Gumi prior to improving its emission facility. Thus, the effect of improving T company emission facility was estimated huge in complex 1 while it was trivial in complex 3. These maximum concentrations of trimethylamine predicted to estimate the expected contribution of total point pollutant sources by CALPUFF modeling showed the similar values to those measured in the region of Gumi. Therefore, the expected contribution of total point pollutant sources to atmospheric trimethylamine concentration in the area of Gumi was validated.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.8
• /
• pp.3112-3118
• /
• 2010

The pH control agent in PWRs, to insure the integrity of steam generator, was changed from ammonia to ethanolamine(ETA) which decreased pH at condensate system and low pressure feedwater heater drain system, so that several amines were investigated for the selection of the optimum amine. There was no single alternative amine to meet the optimum condition. The more volatile ammonia provides the higher pH in condensate, while the less volatile ETA increases the pH in wet steam area. Thus, the combined amine of ammonia and ETA is able to equally raise the pH in both region so that the flow accelerated corrosion be reduced in the every system of the secondary side and the integrity of steam generator be also improved in pressurized water reactors (PWRs).