An improved immobilised Grubbs 2nd generation catalyst and its application in flow‐through devices, shown for on‐column reaction gas chromatography (ocRGC), has been studied. The coupling of a reaction capillary and a separation column in GC/MS allows direct reaction monitoring and analysis of conversion as well as reaction kinetics. The presented permanently bonded N‐heterocyclic carbene ligand shows a great stability and activity in ring closing metathesis reactions. A salt‐free approach was used to generate the carbene ligand, which can be directly monitored by mass spectrometry. The very flexible design of the immobilised ligand system in reaction channels and capillaries of flow through systems allows the preparation of various catalysts using a broad variety of metal precursors. This strategy of immobilised catalytically active complexes offers a wide range of on‐column reactions combinable with fast reaction screening by high throughput experimentation.
In addition to its CX range of twin screw extruders, Centruy Inc. offers its 3+ RingExtruder through a joint venture with Blach Verfahrentechnik GmbH. The design consists of 12 closely intermeshing co-rotating screws and is claimed to offer a unique alternative for increasing throughput without excessive shear or heat generation. The company adds that rather than relying on high screw speeds the 3+ RingExtruder can achieve higher throughput through increased torque and greater free volume. Century adds that melt flow analysis undertaken on samples produced on the 3+ show no appreciable material degradation. A series of RingExtruders ranging from 30-120 mm are available to meet most throughput requirements. The RingExtruder’s screws may be removed from the front or the back of the machine.This is a short news story only. Visit www.addcomp.com for the latest additives and compounding industry news 相似文献
B&P Process Equipment Co. offers twin screw continuous compounding extruders in a 19–450mm screw diameter range. The CT Series of high torque/high speed twin screw extruders offer standard machine diameters from 25mm to 133mm and L/D ratios of up to 52:1. The screw and barrel components are segmented. In addition to the CT Series, the company offers the PC Series of high free volume ‘clam shell’ continuous compounding machines. Standard machine sizes are from 15mm to 160mm, with L/D ratios of up to 50:1. B&P adds that the modular barrel and segmented screw design with individual paddles and hexagonal shafts for simple screw design changes.This is a short news story only. Visit www.addcomp.com for the latest additives and compounding industry news 相似文献
In the study of iron catalysts, careful passivation is necessary for study of microstructure by ex situ analytical techniques. The passivation procedure used in our study consists of heating the sample in He at the reaction temperature, cooling to room temperature and introducing small amounts of O2 (<1%) in a flowing He stream. A properly passivated sample shows no more than a few nm of surface Fe3O4 on-Fe, when examined in a high resolution TEM. Proper passivation is also characterized by an exotherm of no more than 2–3 K. We show that a Fischer-Tropsch catalyst carbided in CO will show substantial amounts of magnetite, if exposed to air without proper passivation. Such surface oxidation may cause errors in determining the relative amounts of the magnetite and carbide phases in Fischer-Tropsch catalysts, which are important for proper identification of the catalytically active phase. 相似文献
NFM Welding Engineers manufactures the TEM Series of co-rotating, intermeshing compounding twin-screw extrusion systems. The company says that this offers a high torque-per-free volume and high screw speed. The TEM Series can process a wide variety of plastics compounds including wood-plastic composite materials, such as PVC, polyethylene and polypropylene, in combination with most woods including pine, maple and oak. NFM adds that the system requires no pre-drying or pre-mixing, saving capital equipment costs, plant space and maintenance. End product can either be directly extruded or pelletized for direct feed to a single screw system. The TEM Series is available in models from 26–240 mm.This is a short news story only. Visit www.addcomp.com for the latest additives and compounding industry news 相似文献
South Korean machinery manufacturer Hankook EM Ltd offers the STS series of co-rotating twin screw extruders for compounding. The company says that there are versions for applications ranging from the laboratory to mass production.This is a short news story only. Visit www.addcomp.com for the latest additives and compounding industry news 相似文献
The PSM series of co-rotating twin screw extruders from Taiwanese company Sino-Alloy offers machines ranging from screw diameters from 31.2 mm up to 92 mm. The company says that the range are suitable for a wide range of applications including compounds with glass — and carbon-fibre reinforcement, adding mineral fillers, polymer alloying, degassing and masterbatching, for example.This is a short news story only. Visit www.addcomp.com for the latest additives and compounding industry news 相似文献
