摘要:
The invention is addressed to very light alumina-based agglomerated bodies, the porosity of which comprises pores of large dimensions. These bodies are produced from alumina gels which are dehydrated in hot gas streams so that the amount of water remaining, which can be measured by calcination at high temperature, is from 8 t0 35% of the weight of the treated gels; the treated gels to which other components can be added are agglomerated by any known means. These bodies can be used in particular in adsorption, catalysis, and chromatography.
摘要:
The invention concerns alumina-based spherically shaped grains produced from pastes of moistened particles. These grains are produced by subjecting the pastes, in the form of grains of any shape whatever, to the action of mechanical vibrations of frequencies within the range of from a few herz, in liquids which are slightly or not at all water-miscible. To the alumina, which is the main component, particles of various natures and acids, bases and various compounds which are dissolved in the water used for preparing the pastes, can be added. Once matured, dried and calcined, the grains have a very high level of resistance to attrition, a porosity comprising pores of large dimensions, and can be used in particular for adsorption, chromatography and catalysis.
摘要:
A method for recycling or renovating old pavements, wherein a rejuvenating binder is used including at least one compound based on fatty substances of natural origin including hydrocarbon fatty chains, these fatty substances of natural origin having undergone at least one chemical functionalization reaction through which at least one oxygenated functional group has been introduced. The rejuvenating binders and rejuvenating binder emulsions especially suitable to the method, and asphalt mixes based on regenerated reclaimed asphalt pavement are also disclosed.