PROCESS FOR THE REMOVAL OF DIMETHYL ETHER CONTAINED AS AN IMPURITY IN LIQUID OLEFINIC C3-C5 FEEDS

Feedstocks of olefinic hydrocarbons having from three to five carbon atoms which contain dimethyl ether impurity in amounts of from 1 to 5000 ppm (wt.) are purified in the liquid phase by contact with an adsorbent comprising a crystalline zeolitic molecular sieve having the faujasite crystal structu...

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Bibliographische Detailangaben
Hauptverfasser:	NAGJI, MOEZ MOHAMMEDALI, CORVINI, GIACOMO
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CRACKING HYDROCARBON OILS FUELS LUBRICANTS METALLURGY MINERAL WAXES ORGANIC CHEMISTRY PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA TECHNICAL GASES CONTAINING CARBON MONOXIDE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	Feedstocks of olefinic hydrocarbons having from three to five carbon atoms which contain dimethyl ether impurity in amounts of from 1 to 5000 ppm (wt.) are purified in the liquid phase by contact with an adsorbent comprising a crystalline zeolitic molecular sieve having the faujasite crystal structure. It have been found that contrary to expectations based on prior observations of the catalytic properties of synthetic faujasites, the faujasite adsorbents are significantly more resistant toward coking and consequent deactivation than are zeolite adsorbents having smaller pore diameters. The invention is particularly beneficial when utilized as an adjunct to the process for preparing alkyl tertiary alkyl ethers by the reaction of a primary alcohol such as methanol with C4-5 tertiary olefins such as isobutylene in admixture with other non-reactive olefins and paraffins.