Entity

Time filter

Source Type

Minato-ku, Japan

Yumoto T.,Omega Simulation Co. | Ootakara S.,Mitsui Chemical Inc. | Seki H.,Tokyo Institute of Technology | Hashimoto Y.,Nagoya Institute of Technology | And 3 more authors.
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2010

A dynamic simulator for the benchmark vinyl acetate (VAc) monomer production process is introduced. Rigorous first-principles dynamic models of the VAc process are implemented on the commercial software package Visual Modeler (Omega Simulation Co., Ltd.). The simulator employs pressure flow calculations and considers non-idealities in the process equipment, so that more realistic simulations are made possible, compared with the conventional simulators. The simulator's high performance calculation provides an environment where feasibility and performance of designed control systems can be efficiently evaluated without sacrificing high fidelity of the process model. The developed simulator will be made available in the public domain with a free limited license of Visual Modeler. © 2009 IFAC. Source


Seki H.,Tokyo Institute of Technology | Ogawa M.,Yokogawa Electric Corporation | Itoh T.,Azukiya cho Fushimi ku | Ootakara S.,Mitsui Chemical Inc. | And 3 more authors.
Computers and Chemical Engineering | Year: 2010

This paper addresses control system design of the vinyl acetate monomer production plant that has been introduced as a plantwide control benchmark problem by Luyben et al. Nonlinear analysis of a simplified model, which includes detailed reactor behavior and ideal separation with gas and liquid recycle, is performed to identify the optimal operating condition and to develop intuition for control system design. Control system is hierarchically constructed to realize the optimal operating condition, which is verified through simulation on a rigorous nonlinear model. © 2009 Elsevier Ltd. Source


Patent
Mitsui Chemical Inc. | Date: 2014-04-01

The present invention addresses the problem of providing a high-transparency polyimide film in which the thickness-direction phase difference Rth is kept within a predetermined range. The present invention also addresses the problem of providing a polyamic acid and a varnish used to obtain the polyimide film. In order to overcome the aforementioned problem, the present invention is a polyimide film containing a polyimide obtained by bringing about a reaction between a tetracarboxylic dianhydride and a diamine, the polyimide film having (a) a thickness-direction phase difference Rth of 5 to 100 nm per 10 m of thickness, (b) a transmittance of 80% or more with respect to light having a wavelength of 400 nm, (c) a haze of 3% or less, and (d) a glass transition point of 250 C. or higher.


Sato K.,Japan National Institute of Advanced Industrial Science and Technology | Horibe H.,Japan National Institute of Advanced Industrial Science and Technology | Shirai T.,Japan National Institute of Advanced Industrial Science and Technology | Hotta Y.,Japan National Institute of Advanced Industrial Science and Technology | And 4 more authors.
Journal of Materials Chemistry | Year: 2010

Thermally conductive ceramic/plastic composite materials are needed in various industries for thermal management. The present work aimed at creating composite films of hexagonal boron nitride (h-BN) particles and polyimide. A thermal conductivity of 7 W m-1 K-1 was achieved at solids loading of 60 vol% with flexibility maintained. © 2010 The Royal Society of Chemistry. Source


Yabu H.,Tohoku University | Yabu H.,Chiyoda Corporation | Matsuo Y.,Chiyoda Corporation | Matsuo Y.,Japan Science and Technology Agency | And 9 more authors.
ACS Applied Materials and Interfaces | Year: 2010

Honeycomb-patterned polymer films prepared by the simple casting of a polymer solution under humid conditions were used as templates for metal microdot arrays formed on shrinkable polymer substrates by metal sputtering. After thermal shrinkage of the substrate, the periodicity of the metal microdots was reduced. In addition, microwrinkles were formed on the metal microdots. The wavelength and arrangement of the microwrinkles were changed with the metal sputtering time and the diameter of the metal microdots. A clear confinement effect was observed in the formation of the microwrinkles. © 2010 American Chemical Society. Source

Discover hidden collaborations