Abstract: A method for producing a gas comprising at least 80 vol % carbon monoxide from a Fischer-Tropsch off-gas comprises: (1) feeding Fischer-Tropsch off-gas through a column comprising an adsorbent bed at high pressure and discharging effluent; (2) reducing the pressure in the column and the bed slightly; (3) rinsing the column and the adsorbent bed with methane or a mixture of methane and carbon dioxide; (4) reducing the pressure of the column and adsorbent bed to a low pressure; (5) rinsing the column and adsorbent bed with a mixture of hydrogen and nitrogen; (6) pressurizing the column and adsorbent bed to a high pressure using a mixture of hydrogen and nitrogen. The product stream obtained in step (3) comprising at least 80 vol % carbon monoxide can be sent as feed to a Fischer-Tropsch reaction. In an embodiment, a gas comprising at least 80 vol % hydrogen is also produced.

Abstract: The present invention provides a process for preparing ethylene and/or propylene and an iso-olefin-depleted olefinic product, comprising the steps of: a) providing a C5 hydrocarbon-comprising stream, comprising C5 cyclopentene and C5 iso-olefins; b) subjecting the C5 hydrocarbon-comprising stream to an etherification process with methanol and/or ethanol wherein at least part of the C5 iso-olefins are converted with methanol and/or ethanol to an tert-alkyl ether, and retrieving an etherification product stream; c) separating at least part of the etherification product stream into at least an ether-enriched stream and a first iso-olefin-depleted olefinic product; d) converting at least part of the tert-alkyl ether in the ether-enriched stream to ethylene and/or propylene by contacting at least part of the ether-enriched stream with a molecular sieve-comprising catalyst at a temperature in the range of from 350 to 1000° C. and retrieving a second olefinic product comprising ethylene and/or propylene.

Abstract: The present invention provides a process for preparing ethylene and propylene, comprising the step of: a) contacting a feed comprising methanol, ethanol and C4+ olefins with a catalyst, comprising ZSM-5 having a silica to alumina ratio in the range of from 40 to 100, at a temperature in the range of from 350 to 1000° C. to obtain a olefinic product comprising ethylene and propylene.

Abstract: The present invention provides a method for start-up of an Oxygenate-to-Olefins process, which process comprises the steps: a) providing an oxygenate-comprising feedstock to an Oxygenate-to-Olefins reaction zone and contacting the feedstock with a zeolite-comprising catalyst at a temperature in the range of from 450 to 700° C. ° C., to obtain an reaction product containing olefins; b) separating the reaction product obtained in step a) in at least a product fraction containing ethylene and/or propylene and a product fraction containing C4+ olefins; c) recycling at least part of the C4+ olefins in the product fraction containing C4+ olefins to the Oxygenate-to-Olefins reaction zone in step (a), characterised in that upon start-up the oxygenate-comprising feedstock initially comprises a first amount of externally supplied tert-alkyl ether and subsequently the amount of externally supplied tert-alkyl ether in the oxygenate-comprising feedstock is reduced.

Abstract: The present invention provides a process preparing ethylene and propylene, comprising the step of: a) contacting a feed comprising a tert alkyl ether obtained from an etherification reaction between ethanol and a tertiary iso-olefin with a zeolite-comprising catalyst at a temperature in the range of from 350 to 1000° C. to obtain a olefinic product comprising ethylene and propylene.

Abstract: The present invention provides a process for preparing ethylene and/or propylene, comprising the steps of contacting a stream comprising C4+ olefins with a zeolite-comprising catalyst at a temperature in the range of from 350 to 1000° C. and retrieving an olefinic product stream comprising: ethylene and/or propylene, and a C4+ hydrocarbon fraction, comprising paraffins, normal olefins and iso-olefins; The C4+ hydrocarbon fraction is recycled while part of the fraction is purged. The part of the C4+ hydrocarbon with is purged is treated to extract C4+ isoolefins as tert-alkyl ethers. At least part of tert-alkyl ethers are converted to further ethylene and propylene.

Abstract: The present invention provides a process for preparing ethylene and/or propylene, comprising the steps of providing a hydrocarbon stream, comprising C4+ normal olefins and C4+ iso-olefins; converting C4+ isoolefins to tert-alkyl ether and separating the ethers from the hydrocarbon stream; isomersing the C4+ normal olefins to iso-olefins and converting C4+ isoolefins to tert-alkyl ether and separating the ethers from the hydrocarbon stream; converting the obtained tert-alkyl ether to ethylene and propylene by contacting the tert-alkyl ether with a molecular sieve-comprising catalyst and retrieving an olefinic product.

Abstract: The present invention provides a process for preparing ethylene and/or propylene and an iso-olefin-depleted C4 olefinic product, comprising the steps of: a) providing a C4 hydrocarbon stream, comprising normal olefins and iso-olefins; b) subjecting the C4 hydrocarbon stream to an etherification process with methanol and/or ethanol wherein at least part of the iso-olefins are converted with methanol and/or ethanol to an tert-alkyl ether, and retrieving an etherification product stream; c) separating at least part of the etherification product stream into at least an ether-enriched stream and a first iso-olefin-depleted C4 olefinic product; d) converting at least part of the tert-alkyl ether in the ether-enriched stream to ethylene and/or propylene by contacting least part of the ether-enriched stream with a molecular sieve-comprising catalyst at a temperature in the range of from 350 to 1000° C. and retrieving a second olefinic product comprising ethylene and/or propylene.

Abstract: The present invention provides a process for preparing ethylene and/or propylene, comprising providing a hydrocarbon stream, comprising C4+ normal and C4+ iso-olefins; subjecting the hydrocarbon stream to an etherification process wherein the iso-olefins are converted with alcohol to an tert-alkyl ether, and retrieving a first etherification product stream; separating the first etherification product stream into a first ether-enriched stream and an iso-olefin-depleted hydrocarbon stream; converting the normal olefins in the iso-olefin-depleted hydrocarbon stream to ethylene and/or propylene with a molecular sieve-comprising catalyst and retrieving an olefinic product; decomposing the tert-alkyl ether in the ether-enriched stream into alcohol and an iso-olefin; isomerising the obtained iso-olefins to normal-olefins and retrieving an normal-olefin-enriched hydrocarbon stream; and converting the normal olefins in the normal-olefin-enriched hydrocarbon stream to ethylene and/or propylene by contacting the normal-