Exxonmobil Chemical Patents Inc.

Other

William L Kuechler, Sr

James Richardson Lattner

Keith Holroyd Kuechler

Stephen Neil Vaughn

Teng Xu

Machteld Maria Mertens

Shun Chong Fung

Nicolas P Coute

Marcel J G Janssen

Jeffrey Scott Smith

Cornelius W M Van Oorschot

Jeffrey L White

David W Kuechler

Paul N Chisholm

Nicolas P Coute'

Disclosed is a method for making olefin product from an oxygenate-containing feedstock. In the method, a silicoaluminophosphate molecular sieve catalyst is contacted with the oxygenate-containing feedstock in a reactor at an average catalyst feedstock exposure index of at least 1.0. The method produces lower coke yield and provides an olefin product which is low in C -C paraffin content. The invention is particularly effective in producing an olefin product having a very low propane content.

Making an olefin product from an oxygenate

Disclosed is a method for converting an oxygenate feedstock to an olefin product. In particular, the method incorporates the use of a silicoaluminophosphate molecular sieve catalyst in the manufacture of ethylene and propylene. The method includes contacting an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve catalyst to form the olefin-containing product in a fluidized bed reactor apparatus including at least a reaction zone and a recirculation zone. Certain ratios of the mass of catalyst in the reaction zone to that of the sum of the mass of catalyst in both the reaction zone and the recirculation zone within the reactor apparatus are specified.

Process for making olefins

The present invention provides a system for the input, retrieval, manipulation and analysis of stored information in an information base. The system comprises an input device, a storage device, and an output device each capable of handling information base records. Each of the fields of the records is processed to produce a compact symbol or code corresponding to predefined ranges of values of an field. These codes are then stored in correspondence with the records which gave rise to them. The result of this processing is a topological map of the fields of the information base records. These topological maps may be retrieved and later processed to efficiently retrieve stored records, given any general unpreprogrammed query as input to the system. These topological maps may also be utilized in a process to determine correlations among the various fields of the records.

System for storing and manipulating information in an information base

The present invention provides a system for the input, retrieval, manipulation and analysis of stored information in an information base. The system comprises an input device, a storage device, and an output device each capable of handling information elements. Each of the attributes of the information elements is processed to produce a compact symbol or code corresponding to predefined ranges of values of an attribute. These codes are then stored in correspondence with the information elements which gave rise to them. The result of this processing is a topological map of the attributes of the information elements. These topological maps may be retrieved and later processed to efficiently retrieve stored information elements, given any general unpreprogrammed query as input to the system. These topological maps may also be utilized in a process to determine correlations among the various attributes of the information elements.

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Hilton Head, SC, United States of America

William L Kuechler, Sr