Process for the conversion of oxygenates to olefins

Abstract

The present invention relates to a process for converting oxygenates to olefins, comprising(1) providing a gas stream comprising one or more ethers;(2) contacting the gas stream provided in (1) with a catalyst,the catalyst comprisinga support substrate anda layer applied to the substrate,the layer comprising one or more zeolites of the MFI, MEL and / or MWW structure type.

Description

[0001]The present invention relates to a process for converting ethers to olefins using a catalyst in the form of a coated support substrate and using a catalyst for conversion of ethers to olefins which is obtainable according to the present invention.INTRODUCTION[0002]In view of increasing scarcity of mineral oil deposits which serve as starting material for preparation of lower hydrocarbons and derivatives thereof, alternative processes for preparing such commodity chemicals are becoming increasingly important. In alternative processes for obtaining lower hydrocarbons and derivatives thereof, specific catalysts are frequently used in order to obtain lower hydrocarbons and derivatives thereof, such as unsaturated lower hydrocarbons in particular, with maximum selectivity from other raw materials and / or chemicals. In this context, important processes include those in which methanol as a starting chemical is subjected to a catalytic conversion, which generally gives rise to a mixtur...

AI Technical Summary

Benefits of technology

The patent text suggests that there is a need for new catalysts and processes that can improve selectivities and resist deactivation in methanol-to-olefin processes. This is important because such improvements can lead to higher efficiency of existing and new processes, and reduce coking of the catalyst. In simple terms, the patent aims to provide better solutions for the production of olefins.

Problems solved by technology

In the case of such catalytic conversions, the challenge is to refine the catalysts used therein, and also the process regime and parameters thereof, in such a way that a few very specific products form with maximum selectivity in the catalytic conversion.

At relatively low temperatures and relatively high space velocities, however, lower space-time yields are described compared to the zeolitic pellets.

However, Hammon et al. describes the use of extrudates shaped to monoliths as catalysts as being particularly disadvantageous due to rapid coking and correspondingly short service lives.