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Petelyza-Chemical PET Recycling
Veselý, Václav
This report treat of selection of clients on chemical recycling process PETELYSE for recycling PET botles. Investment study summarised results of research anad development of technology true to scale 100 kg PET per hour. The technologie is protected by 2 patents. The marketing of produkts is importanr for the investments in recyclation technology. This study treat not of produkt selling and source of PET material
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Influence of stress concentrator geometry on fracture parameters values of quasi-brittle materials
Frantík, P. ; Keršner, Z. ; Klusák, Jan ; Řoutil, L. ; Seitl, Stanislav ; Veselý, V.
To assess the reliability of building structures, values of fracture mechanical properties of their materials have to be known. In the case of cement-based composite types the basic parameters are ascertained on the basis of evaluation of the response of specimens conducted to a test in a suitable testing configuration. Three-point bending specimens with a central starting notch are the most frequently used specimens for laboratory testing. The influence of the stress concentrator – starting central edge notch – in a three point bend specimen on the resulting values of fracture toughness was studied in author’s papers: a crack initiation at the notch tip was numerically simulated. It was shown that the values of fracture toughness obtained for specimens with larger widths of starting notch can be overestimated.
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Influence of vertical compresive force on level of constraint in cubical specimen for wedge splitting test
Seitl, Stanislav ; Klusák, Jan ; Dymáček, Petr ; Řoutil, L. ; Veselý, V.
The subject of the contribution is to gain new aspects of knowledge about the fracture behaviour of cementitious building materials by the wedge splitting test (WST). The particularly, the paper investigates the influence of the vertical compressive force Pv, that represents a reaction of the bottom support of the specimen, on the fracture parameters via tools of the two-parameter fracture mechanics. The effects of the vertical compressive force, Pv, on the plastic and fracture process zones are examined.
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Petelyse-PET Recycling
Veselý, Václav
Chemical recycling of PET to terephtalic acid and ethyleneglycol is carried out in two stages through alkaline glykolysis and subsequent hydrolysis. The product of hydrolysis is elektrolicically further separated into terephtalic acid suspense and alkaline glykol solution. Crystallic terephtalic acid separates from the suspense and once washed is dried. Vacuum istilation is applied to get ethylenglycol.
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Recyklace PET lahví
Veselý, Václav ; Hanika, Jiří
Chemical PET recycling to therephtalic acid and ethylenglycol is carried out through alkaline hydrolysis and subsequend electrodialysis. The alkaline glykol solution is recur to the hydrolysis. Crystallic therephtalic acid is separated from suspense and is washed and dried. Vakuum destilation is applied to get ethylenglycol.
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