Patent ID: 6905662
Filing Date: 2005-06-14
Classification: B01D

Abstract:
1. A method for eliminating undesirable organic compounds which are byproducts of a process for producing anhydrous alumina from alumina trihydrate comprising: (a) preheating alumina trihydrate containing undesirable liquid organic compounds, in process gas in a preheating zone, wherein said liquid organic compounds are converted to gaseous organic compounds; (b) directing the gaseous organic compounds along with fine alumina dust from the process for producing an hydrous alumina alumina trihydrate to a dust removal system, with the gaseous organic compounds being adsorbed on the fine alumina dust; (c) recycling the fine alumina dust with the gaseous organic compounds adsorbed thereon from the dust removal system into a process gas stream at a temperature sufficient to strip off the adsorbed organic compounds from the fine alumina dust and to volatilize said organic compounds; and (d) oxidizing the volatilized organic compounds to water vapor and carbon dioxide.