Search results for "Slurry"
showing 4 items of 44 documents
A New Supported Zirconocene Catalyst for Ethylene Polymerization
1999
Metallocene catalysts enable the structure of polymers to be tailored in a way which has not been reached before. However, they are more active than the conventional Ziegler — Natta catalysts only as homogeneous metalocene systems, a fact that has essentially restricted their use to industrial processes producing polymers in solution. Modern polymerization processes are solvent free slurry (with liquid monomer) or gas phase processes. To use metallocene catalysts in these modern processes, it is necessary to convert them to heterogeneous catalysts [1, 2]. However, problems have appeared chiefly concerning the activity of the supported catalysts, because heterogeneous metallocene catalysts a…
Compatibility of irinotecan-loaded DC Bead with different volumes and types of non-ionic contrast media.
2015
Objectives Irinotecan-loaded microspheres are used for simultaneous embolisation and chemotherapy of liver metastases of colorectal carcinoma. The aim of the study was to evaluate the compatibility of recently introduced DC Bead M1 (bead size 70–150 µm) loaded with irinotecan after admixture with different types and volumes of non-ionic contrast media over a maximum period of 24 h and storage at room temperature. Methods Test suspensions were prepared by loading 2 mL DC Bead M1 with 100 mg irinotecan within 2 h. The loading efficiency was determined by measuring the concentrations of irinotecan in the excess solutions via a reversed phase high pressure liquid chromatography (RP-HPLC) assay …
TRATTAMENTO DI SEDIMENTI MARINI MEDIANTE REATTORI BIOSLURRY: ANALISI DI PROCESSO E CARATTERIZZAZIONE MICROBIOLOGICA
2020
I sedimenti, elementi essenziali e dinamici di tutti i sistemi acquatici, rappresentano un potenziale serbatoio di sostanze tossiche di origine antropogenica. In ambiente marino, essi costituiscono un comparto ambientale estremamente complesso, con modalità di formazione, caratteristiche chimico-fisiche, organismi viventi e tipi di contaminazione estremamente variabili. In particolare, gli idrocarburi di origine petrolifera (indicati globalmente con la misura dei TPH - Total Petroleum Hydrocarbon) inquinanti prioritari particolarmente diffusi nelle aree fortemente industrializzate, tendono a rimanere intrappolati nei sedimenti per lunghi periodi di tempo; ciò li rende una fonte permanente d…
Packing incentives and a reliable N–H⋯N–pyridine synthon in co-crystallization of bipyridines with two agrochemical actives
2011
The co-crystallization of agrochemical actives thiophanate-methyl and thiophanate-ethyl with 2,2′-bipyridine, 4,4′-bipyridine and 1,2-bis(4-pyridyl)ethane was investigated with conventional crystallization, the slurry method and liquid-assisted grinding. Co-crystals of both thiophanates with all bipyridines were found and the structures solved with single crystal X-ray diffraction. Whereas the 2,2′-bipyridine co-crystals seem to form because of a combination of weak interactions, and in the case of the thiophanate-methyl, partly because of close packing incentives, the 4,4′-bipyridine and 1,2-bis(4-pyridyl)ethane co-crystals form mainly because of a favourable N–H···N–pyridine hydrogen bond…