Two large-scale diesel pool fire engulfment testswere carried out on LPG tanksprotected with intumescing materials to test the effectiveness of thermal coatings in the prevention of hot BLEVE accidental scenarios in the road and rail transport of LPG. A specific test protocol was defined to enhance reproducibility of experimental tests. The geometrical characteristics of the test tanks were selected in order to obtain shell stresses similar to those present in full-size road tankers complying to ADR standards. In order to better understand the stress distribution on the vessel and to identify underlying complicating phenomena, a finite element model was also developed to better analyze the experimental data. A non-homogeneous and time-dependent effectiveness of the fire protection given by the intumescing coating was evidenced both by finite element simulations and by the analysis of the coating after the tests. The results of the fire tests pointed out that the coating assured an effective protection of the tanks, consistently increasing the expected time to failure. The data obtained suggest that the introduction of fire protection coatings may be a viable route to improve the safety of the LPG distribution chain.
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The improvement of passive fire protection of storage vessels is a key factor to enhance safety among the LPG distribution chain. A thermal and mechanical model based on finite elements simulations was developed to assess the behaviour of full size tanks used for LPG storage and transportation in fire engulfment scenarios. The model was validated by experimental results. A specific analysis of the performance of four different reference coating materials was then carried out, also defining specific key performance indicators (KPIs) to assess design safety margins in near-miss simulations. The results confirmed the wide influence of coating application on the expected vessel time to failure due to fire engulfment. Aquite different performance of the alternative coating materialswas evidenced. General correlationswere developed among the vessel time to failure and the effective coating thickness in full engulfment scenarios, providing a preliminary assessment of the coating thickness required to prevent tank rupture for a given time lapse. The KPIs defined allowed the assessment of the available safety margins in the reference scenarios analyzed and of the robustness of thermal protection design.
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From the article: "A facile approach for the fabrication of large-scale interdigitated nanogap electrodes (nanogap IDEs) with a controllable gap was demonstrated with conventional micro-fabrication technology to develop chemocapacitors for gas sensing applications. In this work, interdigitated nanogap electrodes (nanogap IDEs) with gaps from 50–250 nm have been designed and processed at full wafer-scale. These nanogap IDEs were then coated with poly(4-vinyl phenol) as a sensitive layer to form gas sensors for acetone detection at low concentrations. These acetone sensors showed excellent sensing performance with a dynamic range from 1000 ppm to 10 ppm of acetone at room temperature and the observed results are compared with conventional interdigitated microelectrodes according to our previous work. Sensitivity and reproducibility of devices are discussed in detail. Our approach of fabrication of nanogap IDEs together with a simple coating method to apply the sensing layer opens up possibilities to create various nanogap devices in a cost-effective manner for gas sensing applications"
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In this proposal, a consortium of knowledge institutes (wo, hbo) and industry aims to carry out the chemical re/upcycling of polyamides and polyurethanes by means of an ammonolysis, a depolymerisation reaction using ammonia (NH3). The products obtained are then purified from impurities and by-products, and in the case of polyurethanes, the amines obtained are reused for resynthesis of the polymer. In the depolymerisation of polyamides, the purified amides are converted to the corresponding amines by (in situ) hydrogenation or a Hofmann rearrangement, thereby forming new sources of amine. Alternatively, the amides are hydrolysed toward the corresponding carboxylic acids and reused in the repolymerisation towards polyamides. The above cycles are particularly suitable for end-of-life plastic streams from sorting installations that are not suitable for mechanical/chemical recycling. Any loss of material is compensated for by synthesis of amines from (mixtures of) end-of-life plastics and biomass (organic waste streams) and from end-of-life polyesters (ammonolysis). The ammonia required for depolymerisation can be synthesised from green hydrogen (Haber-Bosch process).By closing carbon cycles (high carbon efficiency) and supplementing the amines needed for the chain from biomass and end-of-life plastics, a significant CO2 saving is achieved as well as reduction in material input and waste. The research will focus on a number of specific industrially relevant cases/chains and will result in economically, ecologically (including safety) and socially acceptable routes for recycling polyamides and polyurethanes. Commercialisation of the results obtained are foreseen by the companies involved (a.o. Teijin and Covestro). Furthermore, as our project will result in a wide variety of new and drop-in (di)amines from sustainable sources, it will increase the attractiveness to use these sustainable monomers for currently prepared and new polyamides and polyurethanes. Also other market applications (pharma, fine chemicals, coatings, electronics, etc.) are foreseen for the sustainable amines synthesized within our proposition.
Alle auto's, windmolens en o.a. houten kozijnen hebben één ding gemeen. Ze moeten gecoat worden om het materiaal te beschermen. Alleen al in Nederland wordt ruim 1 miljard euro omzet gerealiseerd met coatings. Er is dringend behoefte aan verduurzaming en innovatie. Aan het einde van de levensduur wordt de coating meestal verbrand, dit leidt tot meer CO2 omdat coatings veelal van fossiele grondstoffen zijn gemaakt. Het maken van een biobased coating is daarom essentieel. Echter, één belangrijk ingrediënt mist, de aromaat. Het zijn de aromaten die de coating glanzend, krasvast en uv-bestendig maken. De coatingindustrie heeft geprobeerd het fossiele ingrediënt ftaalzuuranhydride (PA) in de hars te vervangen, maar er is tot op heden geen goede oplossing gevonden. Relement ontwikkelde als eerste bedrijf wereldwijd een bio-aromaat, te weten biobased 3-methylftaalzuuranhydride (bio-MPA). Een showmodel van een coating gebaseerd op bio-MPA ontbreekt en dat is precies wat samen met Fontys Hogeschool onderzocht gaat worden in dit KIEM Go-Chem project. Het doel van het project Alchemist is om een biobased alkyd coating showmodel te realiseren gebaseerd op bio-MPA i.p.v. fossiel PA. De eigenschappen van de coating worden getest en vergeleken met een alkyd coating gebaseerd op fossiel PA. Er worden betere eigenschappen verwacht door het vervangen van PA door MPA.
Coatings zijn overal: denk aan o.a. auto’s, windmolens en houten kozijnen. Alleen al in Nederland wordt ruim 1 miljard euro omzet gerealiseerd met coatings. Er is echter een probleem: aan het einde van de levensduur wordt de coating meestal verbrand, omdat recycling erg moeilijk is. Het maken van een biobased coating is daarom essentieel om de CO2-voetprint te verlagen. Echter, één belangrijk ingrediënt mist, de aromaat. Het zijn de aromaten die de coating belangrijke eigenschappen geven zoals glans en krasvastheid. Relement ontwikkelde als eerste bedrijf wereldwijd een bio-aromaat, te weten biobased 3-methylftaalzuuranhydride (bio MPA) wat een vervanger kan zijn voor het fossiel ftaalzuuranhydride (PA). Het doel van dit Kiem GoChem project Alchimist is om het effect van bio MPA t.o.v. fossiel PA op de performance van een alkydcoating beter te begrijpen.
