Patent application number | Description | Published |
20130066032 | PROCESS FOR PREPARING ETHYLENE AND/OR PROPYLENE - 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-olefin-enriched hydrocarbon stream with a molecular sieve-comprising catalyst and retrieving an olefinic product. | 03-14-2013 |
20130096352 | PROCESS FOR CONVERTING AN ALKYL TERT-ALKYL ETHER INTO AN ALKANOL AND AN ISO-ALKANE - The invention relates to a process for converting an alkyl tert-alkyl ether into an alkanol and an iso-alkane wherein the alkyl tert-alkyl ether is contacted with a hydrocracking catalyst in the presence of hydrogen under hydrocracking process conditions. | 04-18-2013 |
20130172627 | PROCESS FOR PREPARING LOWER OLEFINS - The invention is a process for preparing lower olefins comprising: a) steam cracking a paraffinic feedstock to obtain a cracker effluent comprising olefins and saturated and unsaturated C4 hydrocarbons; b) contacting an oxygenate feedstock with a molecular sieve-comprising catalyst, at a temperature in the range of from 350 to 1000° C. to obtain an oxygenate conversion effluent comprising olefins and saturated and unsaturated C4 hydrocarbons; c) subjecting the cracker effluent and the oxygenate conversion effluent to one or more separation steps such that an olefin product stream comprising ethylene and/or propylene, and a stream comprising saturated and unsaturated C4 hydrocarbons are obtained; and d) subjecting part of the stream comprising C4 hydrocarbons from both the cracker effluent and the oxygenate conversion effluent to extractive distillation to obtain a stream enriched in unsaturated C4 hydrocarbons and a stream enriched in saturated C4 hydrocarbons. | 07-04-2013 |
20130172644 | PROCESS FOR PREPARING LOWER OLEFINS FROM AN OXYGENATE - The invention relates to a process for preparing lower olefins from an oxygenate, the process comprising: subjecting C4 hydrocarbons obtained in an oxygenate-to-olefins conversion step to extractive distillation to an etherification step to convert isobutene into an alkyl tertiary butyl ether to obtain an isobutene-depleted C4 hydrocarbon stream and alkyl tertiary-butyl ether; | 07-04-2013 |
20130172645 | PROCESS FOR PREPARING LOWER OLEFINS FROM AN OXYGENATE - The invention relates to a process for preparing lower olefins from an oxygenate, the process comprising subjecting C4 hydrocarbons obtained in an oxygenate-to-olefins conversion step to extractive distillation to obtain a stream enriched in unsaturated C4 hydrocarbons comprising isobutene and n-butenes, and a stream enriched in saturated C4 hydrocarbons; converting the isobutene in the stream enriched in unsaturated C4 hydrocarbons into an alkyl tertiary butyl ether to obtain an isobutene-depleted unsaturated C4 hydrocarbon stream and alkyl tertiary-butyl ether; and recycling at least part of the isobutene-depleted unsaturated C4 hydrocarbon stream and/or at least part of the alkyl tertiary-butyl ether, optionally after conversion into tertiary butanol and/or isobutene, to the oxygenate-to-olefins conversion step. | 07-04-2013 |
20130237713 | PROCESS FOR PREPARING ETHYLENE AND PROPYLENE - 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 to retrieve 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 subjected to an etherification process with wherein at least part of the iso-olefins are converted with methanol and/or ethanol to an tert-alkyl ether and an etherification product stream is retrieved and separated into an ether-enriched stream and an iso-olefin-depleted C4+ hydrocarbon stream. Part of the iso-olefin-depleted C4+ hydrocarbon stream from the process to purge part of the paraffinic C4+ hydrocarbons while another part of the iso-olefin-depleted C4+ hydrocarbon stream is recycled. The tert-alkyl ether in the ether-enriched stream is converted to ethylene and/or propylene by contacting at least part of the ether-enriched stream with a molecular sieve-comprising catalyst. | 09-12-2013 |
20130237715 | PROCESS FOR PREPARING ETHYLENE AND PROPYLENE - The present invention provides a process for preparing ethylene and/or propylene, comprising the steps of:
| 09-12-2013 |
20130245292 | PROCESS FOR PREPARING ETHYLENE AND/OR PROPYLENE AND AN ISO-OLEFIN-DEPLETED OLEFINIC PRODUCT - The present invention provides a process for preparing ethylene and/or propylene and an iso-olefin-depleted olefinic product, comprising the steps of:
| 09-19-2013 |
20130245294 | METHOD FOR START-UP OF AN OXYGENATE-TO-OLEFIN PROCESS - The present invention provides a method for start-up of an Oxygenate-to-Olefins process, which process comprises the steps:
| 09-19-2013 |
20150112107 | OXYGENATE-TO-OLEFINS PROCESS AND AN APPARATUS THEREFOR - The present invention relates to a process for the preparation of an olefinic product, such as one or both of ethylene and propylene, from an oxygenate feedstock, such as methanol, and an apparatus therefore, said process comprising: treating an effluent stream with a carbonyl compound absorbent stream comprising an aqueous solution of bisulphite having a pH in the range of from 4 to 8, to provide an olefinic product stream comprising olefin and a loaded carbonyl compound absorbent stream comprising an aqueous solution of at least one carbonyl adduct comprising one or both of C2+ aldehyde adduct and ketone adduct and optionally unreacted bisulphite, said liquid absorbent stream and loaded carbonyl compound absorbent stream in a carbonyl compound absorbent circuit separate from the effluent separation circuit. | 04-23-2015 |