• 제목/요약/키워드: Multicomponent

Search Result 248, Processing Time 0.027 seconds

A Study on Economics of Air Stripping Towers and Activated Carbon Adsorption(Multicomponent System) (충전탑 공기 스트리핑과 활성탄 흡착의 경제성에 관한 연구(다중성분계))

  • Yoo, Ho Sik
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.12 no.4
    • /
    • pp.33-42
    • /
    • 1998
  • The optimum design and preliminary cost estimations of air stripping towers ASTs with granular activated carbon adsorption (GAC) systems as the off-gas treatment were done and compared to liquid-phase GAC system. The optimum design and preliminary cost estimations were done for either single or multicomponent systems. A computer program was developed for this study. 15 single compounds and their multicomponent systems were studies. Even with off-gas treatment, AST was generally a less expensive process for treatment of volatile organics than liquid-phase GAC system. Treatment costs of small systems were sensitive to system capacity. Accumulative effect of treatment costs was found in multicomponent systems. The cost of a multicomponent system was highly dependent on the least strippable component in ASTs even with gas-phase GAC or the least adsorbable component in liquid-phase GAC system.

  • PDF

Efficient Synthesis of β-Acetamido Ketones by Silver(I) Triflate-Catalyzed Multicomponent Reactions

  • Pandit, Rameshwar Prasad;Lee, Yong Rok
    • Bulletin of the Korean Chemical Society
    • /
    • v.33 no.11
    • /
    • pp.3559-3564
    • /
    • 2012
  • An efficient one-pot synthesis of ${\beta}$-acetamido ketones was accomplished by AgOTf-catalyzed multicomponent reactions of substituted acetophenones with aromatic aldehydes and acid chloride in acetonitrile in high yields. The methods offer several significant advantages of easy handling, mild reaction conditions, and use of effective and non-toxic catalyst.

Estimate of Mechanical Properties depending on Injected direction in Polymer for Automobile Application (자동차 부품의 응용을 위한 고분자재료의 사출방향에 따른 강도 평가)

  • Lee, Seoung-Jae;Lee, In-Seob
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.5 no.1
    • /
    • pp.27-32
    • /
    • 2002
  • In this study, estimate of Mechanical Properties depending on Injected direction in Polymer for Automobile Application. The used materials is polyamid(nylon6), polypropylene(PP) of a simple component and its mixed, reinforced glass fiber(15%) in polyamid. One side direction of a simple component is highest strength and the two sides direction of multicomponent appear lowest strength. This is caused by effects of weldline, imperfect fusion and impregnation of multicomponent. To improve mechanical properties, it is necessary to minimize of weldline, compatibility, perfect fusion and impregnation in multicomponent polymer.

  • PDF

Demodulation and Performance of Multicomponent Undersampled AM, FM and AM-FM Signals (다중 성분의 저표본화된 AM, FM 및 AM-FM 신호들의 복조와 성능)

  • Son, Tae-Ho;Hwang, Ui-Cheon
    • The Transactions of the Korean Institute of Electrical Engineers D
    • /
    • v.49 no.7
    • /
    • pp.399-406
    • /
    • 2000
  • We propose an nonlinear demodulation algorithm for undersampled multicomponent AM(Amplitude Modulation), FM(Frequency Modulation) and AM-FM signals. First, we derive respectively undersampling frequency of the AM, FM and AM-FM using undersampling scheme, and separate respectively monocomponent signals from multicomponent signals using periodic algebraic separation algorithm. In this case augmented separation matrix is very regular and sparse, it has a special structure. The proposed demodulation algorithm detects respectively message signals of the IA(Instantaneous Amplitude) and IF(Instantaneous Frequency) from descrete monocomponent AM, FM and AM-FM signals with an undersampling frequency to be controllable. Verifying the RMS(Root Mean Squares) errors of the detected signals, we show that the performance is excellent.

  • PDF

SEC/Light Scattering Analysis of Multicomponent Polymer Systems

  • 이희정;장태현
    • Bulletin of the Korean Chemical Society
    • /
    • v.17 no.7
    • /
    • pp.648-653
    • /
    • 1996
  • We have shown several examples of characterization of multicomponent polymer systems by size exclusion chromatography coupled with a light scattering detector. Although SEC cannot provide a complete information for such systems due to its intrinsic limitation, one can extend its capability by combining multiple detection in order to get relevant information to some extent.

Modeling of Multicomponent Mixture Separation Processes Using Hollowfiber Membrane (중공사막을 이용하는 다성분 혼합물 분리공정의 모델링)

  • Kim, Sin-Ah;Kim, Jin-Kuk;Lee, Young Moo;Yeo, Yeong-Koo
    • Korean Chemical Engineering Research
    • /
    • v.53 no.1
    • /
    • pp.22-30
    • /
    • 2015
  • So far, most of research activities on modeling of membrane separation processes have been focused on binary feed mixture. But, in actual separation operations, binary feed is hard to find and most separation processes involve multicomponent feed mixture. In this work models for membrane separation processes treating multicomponent feed mixture are developed. Various model types are investigated and validity of proposed models are analysed based on experimental data obtained using hollowfiber membranes. The proposed separation models show quick convergence and exhibit good tracking performance.

An Extended Similarity Solution for One-Dimensional Multicomponent Alloy Solidification in the Presence of Shrinkage-Induced Flow (체적수축유동이 있는 일차원 다원합금 응고에 대한 확장된 해석해)

  • Chung, Jae-Dong;Yoo, Ho-Seon;Choi, Man-Soo;Lee, Joon-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.24 no.3
    • /
    • pp.426-434
    • /
    • 2000
  • This paper deals with a generalized similarity solution for the one-dimensional solidification of ternary or higher-order multicomponent alloys. The present approach not only retains the existing features of binary systems such as temperature- solute coupling, shrinkage-induced flow, solid-liquid property differences, and finite back diffusion, but also is capable of handling a multicomponent alloy without restrictions on the partition coefficient and microsegregation parameter. For an alloy of N-solute species, governing equations in the mushy region reduce to (N+2) nonlinear ordinary differential equations via similarity transformation, which are to be solved along with the closed-form solutions for the solid and liquid regions. A linearized correction scheme adopted in the solution procedure facilitates to determine the solidus and liquidus positions stably. The result for a sample ternary alloy agrees excellently with the numerical prediction as well as the reported similarity solution. Additional calculations are also presented to show the utility of this study. Finally, it is concluded that the present analysis includes the previous analytical approaches as subsets.

An Analysis of Generation and Growth of Multicomponent Particles in the Modified Chemical Vapor Deposition (수정된 화학증착공정에서 다종 성분 입자 생성 및 성장 해석)

  • Lee, Bang Weon;Park, Kyong Soon;Choi, Mansoo
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.23 no.5
    • /
    • pp.670-677
    • /
    • 1999
  • An analysis of generation and growth of multicomponent particles has been carried out to predict the size and composition distributions of particles generated in the Modified Chemical Vapor Deposition(MCVD) process. In MCVD process. scale-up of sintering and micro-control of refractive index may need the Information about the size and composition distributions of $SiO_2-GeO_2$ particles that are generated and deposited. The present work solved coupled steady equations (axi-symmetric two dimensions) for mass conservation, momentum balance. energy and species(such as $SiCl_4$, $GeCl_4$, $O_2$, $Cl_2$) conservations describing fluid flow. heat and mass transfer in a tube. Sectional method has been applied to obtain multi-modal distributions of multicomponent aerosols which vary in both radial and axial directions. Chemical reactions of $SiCl_4$ and $GeCl_4$ were included and the effects of variable properties have also been considered.