4542252 Multi-stage adiabatic process for methanol conversion to light olefins

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New Patents 4541933

4542252

PROCESS FOR SEPARATION OF ASH FROM WASTE ACTIVATED SLUDGE

MULTI-STAGE ADIABATIC PROCESS FOR METHANOL CONVERSION TO LIGHT OLEFINS

Clarl~ W Armold, Michael B Huebner, David Tobin

Kenneth R Graziani, Ajit V Sapre assigned to Mobil Oil Corporation

A process and apparatus for removal of ash from a waste activated sludge stream includes a pressure regulator for controlling the pressure of r s

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incoming waste activated sludge containing water or supernatant, carbon and ash as suspended solids; a first stage separation including a plurality of parallel mounted hydrocyclones for receiving the controlled pressure incoming waste activated sludge for separation into a first fluid output containing substantially supernatant and carbon and a second fluid output containing a greater concentration of ash; and a second separation stage including a vibrating screen which receives the second fluid output from the first separation stage, such vibrating screen allowing substantially only the passage of supernatant and carbon therethrough thus producing a third fluid output and a fourth output of ash concentrate which can be ultimately removed from the process.

The operating performance of a multi-stage fixed bed adiabatic reactor system with interstage cooling designed for the exothermic conversion of methanol to light olefins is improved by cofeeding small quantities of light olefins with the methanol feed whereby a more controllable operation is achieved. Catalyst activity and cycle length also improves significantly. The light olefins can be produced in situ during dehydration.

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