• Journal of the Korean Chemical Society
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• v.52 no.3
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• pp.223-238
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• 2008

this work is given a new pseudoniverse matrix method for balancing chemical equations. Here offered method is founded on virtue of the solution of a Diophantine matrix equation by using of a Moore-Penrose pseudoinverse matrix. The method has been tested on several typical chemical equations and found to be very successful for the all equations in our extensive balancing research. This method, which works successfully without any limitations, also has the capability to determine the feasibility of a new chemical reaction, and if it is feasible, then it will balance the equation. Chemical equations treated here possess atoms with fractional oxidation numbers. Also, in the present work are introduced necessary and sufficient criteria for stability of chemical equations over stability of their extended matrices.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.11a
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• pp.267-267
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• 2019

The purpose of this study is to understand the risk of chemical product, Styrene Monomer(SM), shipped in a vessel. SM is harmful chemical product which can make injury, explosion and/or fire in a vessel. The understand of SM risk is very important to protect seafarer's body and vessel safety. This research can be expected that the understanding of SM risk by a seafarer's to prevent accidents by SM explosion/fire. In this study we used event tree analysis method using chemical reaction cased by explosion. As a result, we founded various chemical reaction and visualization for explosion path.

• Journal of the Korean Society of Propulsion Engineers
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• v.20 no.2
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• pp.46-55
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• 2016

The kinetic analysis of a heavily aluminized cyclotrimethylene-trinitramine(RDX) is conducted using differential scanning calorimetry(DSC), and the Friedman isoconversional method is applied to the DSC experimental data. The pre-exponential factor and activation energy are extracted as a function of the product mass fraction. The extracted kinetic scheme does not assume multiple chemical steps to describe the complex response of energetic materials; instead, a set of multiple Arrhenius factors is constructed based on the local progress of the exothermic reaction. The resulting reaction kinetic scheme is applied to two thermal decomposition tests for validating the reactive flow response of a heavily aluminized RDX. The results support applicability of the present model to practical thermal explosion systems.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.10a
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• pp.44-47
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• 2003

중소규모 사업장의 대부분은 회분식 반응공정을 이용하여 소량 다품종의 제품을 생산한다. 회분식 공정은 연속식 공정에 비해 수동운전의 비율이 높아서 인적오류에 의한 사고발생 가능성이 상대적으로 높으며, 사고 발생 시 인적 피해가 크게 나타날 수 있는 가능성을 내포하고 있다. 또한 대규모의 사업장에 비해 적절한 위험성평가나 안전관리가 이루어지기 어렵다. 따라서 회분식 공정에서의 위험특성을 구체적으로 규명하고, 이를 바탕으로 회분식 반응기에서의 사고를 예방하기 위한 일반적인 가이드를 제시하고자 한다. 이러한 회분식 공정의 위험성평가와 관련하여 영국 및 미국 화공학회에서는 화학반응 및 회분식 반응공정의 위험성평가 지침을 제시하고 있다.(중략)

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.297-302
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• 2003

국내 화학공업에 있어서 두드러진 특징중의 하나는 의약품, 염·안료 등과 같은 부가가치가 매우 큰 제품을 제조하는 정밀화학공업이 대부분을 차지하고 있으며, 반응기는 회분식으로 대상이 되는 공정의 반응조건 등을 제조자 스스로 결정해야 하는 것이 많아 오조작이나 열분해반응이나 폭주반응과 같은 이상반응 발생 시 조기 제어 미흡 등으로 인한 화재 폭발 등 중대사고가 발생할 위험성이 매우 크다. 실제로 회분식 반응기에 의한 사고가 빈번히 발생하였고 사고에 의한 피해도 심각하다.(중략)

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.547-553
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• 2017

Thermal analysis of three energetic materials used in pyroelectric device was performed using Differential Scanning Calorimetry (DSC). The theoretical method for extracting the reaction rate equation of energetic materials using DSC experimental data is proposed and the reaction rate extraction is performed. The results of the DSC were analyzed by the conversion method such as Friedman. Activation energy and frequency factor according to mass fraction were extracted to complete the reaction rate equation. The extracted reaction rate equation has a form that represents the entire chemical reaction process, not the assumption that the chemical reaction process of the high energy material is a main step in several stages. It has considerable advantages in terms of theoretical and accuracy as compared with the chemical reaction rate form extracted through conventional thermal analysis experiments. Using the derived reaction rate equation, we predicted the performance change of three energetic materials operating on actual storage condition over 20 years.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.385-393
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• 2019

Potential fire, explosion and safety hazards exist in medium- or small-scale chemical plants using radical batch reaction processes due to the various conditions of materials, works or products. To minimize the potential damage, a study was conducted on qualitative hazard analysis using the HAZOP technique, which is a typical method for a qualitative risk assessment and analysis of the potential risks encountered in these chemical plants. For this purpose, a domestic chemical plant, which produces the acrylic resin by a radical batch reaction process, was selected and a risk assessment and analysis according to the procedure of HAZOP method was performed for the process. As the result of the study, to prevent the hazard, the input of inert gas and the installation of a pressure gauge were indispensable. In addition, the initiator and monomer should also be separated, and inhibiting substances and equipment are also necessary to prevent a runaway reaction.

• Journal of the Korean Society of Propulsion Engineers
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• v.19 no.1
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• pp.33-41
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• 2015

The kinetic analysis of energetic materials using Differential Scanning Calorimetry (DSC) is proposed. Friedman Isoconversional method is applied to DSC experiment data and AKTS software is used for analysis. The proposed kinetic scheme has considerable advantage over the standard method based on One-Dimenaionl Time to Explosion (ODTX). Reaction rate and product mass fraction simulation are conducted to validate extracted kinetic scheme. Also a slow cook-off simulation is implemented on $B/KNO_3$ for validating the applicability of the extracted kinetics scheme to a practical thermal experiment.

• Journal of the Korean Chemical Society
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• v.14 no.1
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• pp.45-48
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• 1970

The WLF equation is derived from the theory of rate processes in conjunction with the theory of liquids of significant structures. The empirical parameters in the WLF equation are discussed and compared with the corresponding quantities in the derived equation.

• Proceedings of the KAIS Fall Conference
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• 2005.05a
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• pp.274-276
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• 2005

본 논문에서는 유동층 화학기상증착법(FB CVB; Fluidized Bed Chemical Vapor Deposition)으로 광촉매가 박막증착된 비드를 제조하였고 제조된 광촉매코팅비드의 광반응성을 연속식 반응기에서 아세트알데히드의 분해능력을 측정하여 분석하였다. 광촉매가 박막증착된 비드의 FE-SEM 분석 결과 글라스 비드 위의 티타니아는 비교적 매끄럽게 증착되었고, 실리카 위의 티타니아는 입자의 형태로 증착되었으며 알루미나 위의 티타니아는 결정상을 이루며 증착됨을 확인 할 수 있었다. Acetaldehyde 기체의 광촉매에 의한 분해 실험을 진행하기 위해 연속식 반응기를 설계 제작하였고, 이 반응기를 사용하여 제조된 광촉매 코팅입자의 광반응성을 살펴보았다. 반응기는 가스 주입구와 출구를 갖고 있으며, 중심부에 UV 램프가 설치되었다. 반응기는 내열유리(pyrex)로 제작하였으며, 체적은 100 ml이다. 반응기 내부의 중심부에 UV 램프가 설치되고 UV 램프와 반응기 외부사이에 유동층 화학기상증착법에 의해 티타니아가 박막증착된 광촉매입자가 위치하여 광반응성을 평가하였다. 유량변화에 따른 광반응성을 측정하였으며, 알루미나에 광촉매를 증착시킨 제품의 경우 가스유량 100cc/min에서는 acetaldehyde가 $100\%$ 분해되고, 가스유량 500cc/min에서는 $50\%$정도 분해되는 것을 알 수 있었다.