Sasol Technology Proprietary Limited

Isabella Lodewina Greeff

Andre Peter Steynberg

Jan Hendrik Duvenhage Boshoff

A process for co-producing synthesis gas and power includes producing a synthesis gas comprising at least CO and Hby reacting a hydrocarbonaceous feedstock with oxygen, the synthesis gas being at a first temperature, separating air from a compressed air stream by means of at least one ion transport membrane unit thereby producing a permeate stream consisting predominantly of oxygen and a reject stream of oxygen-depleted air at a second temperature which is lower than the first temperature, indirectly heating the reject stream of oxygen-depleted air with the synthesis gas and at least partially expanding, the heated reject stream of oxygen-depleted air through at least one turbine to generate power, producing an at least partially expanded reject stream of oxygen-depleted air, and feeding at least a portion of the permeate stream consisting predominantly of oxygen to the synthesis gas generation stage to provide oxygen for production of synthesis gas.

Process for co-producing synthesis gas and power

A process () for co-producing power and hydrocarbons includes gasifying () coal to produce a synthesis gas () and a combustion gas () both comprising at least COHand COand being at elevated pressure, separating CO() from the synthesis gas, and synthesizing () hydrocarbons from the synthesis gas. Power () is generated from the combustion gas, including by combusting () the combustion gas in the presence of oxygen and in the presence of at least a portion of the separated CO2 as moderating agent to produce a hot combusted gas () which includes CO. The CO2 is recycled () or recovered from the combusted gas. In certain embodiments, the process () produces a COexhaust stream () for sequestration or capturing for further use.

Co-production of power and hydrocarbons

A process () for co-producing synthesis gas and power includes in a synthesis gas generation stage, producing a hot synthesis gas and, in a nuclear power generation stage (), heating a working fluid with heat generated by a nuclear reaction to produce a heated working fluid and generating power by expanding the heated working fluid using one or more turbines (), with additional heating () of the heated working fluid by indirect transfer of heat from the hot synthesis gas to the heated working fluid.

Co-production of synthesis gas and power

A process () for co-producing power and hydrocarbons includes in a wet gasification stage (), gasifying coal to produce a combustion gas () at elevated pressure comprising at least Hand CO; enriching () a first portion of the combustion gas with Hto produce an H-enriched gas (); and generating power () from a second portion of the combustion gas. In a dry gasification stage (), coal is gasified to produce a synthesis gas precursor () at elevated pressure comprising at least Hand CO. At least a portion of the H-enriched gas () is mixed with the synthesis gas precursor () to provide a synthesis gas for hydrocarbon synthesis, with hydrocarbons being synthesized () from the synthesis gas. In certain embodiments, the process () produces a COexhaust stream () for sequestration or capturing for further use.

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Johannesburg, South Africa

Isabella Lodewina Greeff