Patent ID: 7626067

Claim:
A process for converting oxygenates to one or more olefin product streams, the process comprising the steps of: (a) optionally synthesizing a molecular sieve; (b) optionally combining the synthesized molecular sieve with a binder and optionally also with a matrix material to produce a formulated molecular sieve catalyst; (c) providing an oxygenate feed stream to an oxygenate to olefin reactor; (d) contacting the oxygenate feed stream in the oxygenate to olefin reactor with the formulated molecular sieve catalyst under conditions effective to produce an effluent stream comprising one or more olefins and byproduct water; (e) recovering and treating said one or more olefins in one or more olefin product streams, the step of recovering having a process water requirement; (f) recovering in a single-stage direct quench device the byproduct water from the effluent stream in the form of process quality water, which comprises: (v) about 1 wt. % or less metal ion salts; based upon the composition of the process quality water; and (g) supplying about 25 wt. % or more of the process water requirement from byproduct water, wherein the process water requirement is water that is consumed in the oxygenate to olefin process by at least one application in the process that consumes water without recovering the consumed water; wherein the process quality water is combined with the starting materials in the synthesis of molecular sieves, or in the preparation of a formulated catalyst composition.