Method for producing acetylenes and syngas

摘要

The invention relates to a continuous method for producing acetylenes and syngas by partially oxidizing hydrocarbons with oxygen. A first feed stream (1) containing one or more hydrocarbons and a second feed stream (2) containing oxygen are —mixed in a ratio of the mass flows of the second feed stream (2) to the first feed stream (1) corresponding to an oxygen number of less than or equal to 0.31, said streams being heated separately from each other, —and fed to a combustion chamber (FR) via a burner block (BR), the partial oxidation of the hydrocarbons being carried out in said combustion chamber, —thereby obtaining a first cracked gas stream Ig. The invention is characterized in that —the first cracked gas stream Ig is precooled to a temperature ranging from 100 to 1000° C. in a prequench region (H), thereby obtaining a second cracked gas stream IIg, —50 to 90% of the solids contained in the second cracked gas stream IIg are separated therefrom in a solid-gas separating device (A), thereby obtaining a solid stream If and a third cracked gas stream IIIg, —the third cracked gas stream IIIg is cooled to 80 to 90° C. by injecting water in a total quench region (B), thereby obtaining a fourth cracked gas stream IVg and a first process water stream Iliq, —the fourth cracked gas stream IVg undergoes a fine separation of solids in one or more scrubbing devices (C, D), thereby obtaining one or more process water streams IIliq, IIIliq and a product gas stream VIg, —the process water streams Iliq, IIliq, IIIliq are merged into a combined process water stream IVliq, —the combined process water stream IVliq is partly recirculated, as stream Vliq, into the total quench region (B) and otherwise undergoes a cleaning process, as stream VIliq, by means of a partial evaporation process, thereby obtaining a cleaned process water stream VIIliq, —which is cooled by a recooling device (F), partially recycled, as stream VIIIliq, into the method, and otherwise discharged, as stream IXliq.

主权项

1. A continuous process for preparing acetylene and synthesis gas by partial oxidation of hydrocarbons with oxygen, comprising:
separately heating in preheaters a first input stream comprising one or more hydrocarbons and a second input stream comprising oxygen, mixing in a mixing unit the first and second input streams in a ratio of mass flow of the second to first input stream corresponding to an oxygen ratio of less than or equal to 0.31, wherein the oxygen ratio is the amount of oxygen present in the second input stream to the amount of oxygen which is needed stoichiometrically for full combustion of one or more hydrocarbons in the first input stream, supplying said mixture of the first and second streams via a burner block to a combustion chamber configured for partial oxidation of the one or more hydrocarbons, thus obtaining a first cracking gas stream Ig; cooling in a prequench said first cracking gas stream Ig by injecting an aqueous quench medium to a temperature of 100 to 1,000° C., thus obtaining a second cracking gas stream IIg; removing in a solid-gas separation apparatus 50 to 90% of the solids present in the second cracking gas stream IIg thus obtaining a solids stream If and a third cracking gas stream IIIg, cooling in a total quench the third cracking gas stream IIIg by injecting water to a temperature of 80 to 90° C. to obtain a fourth cracking gas stream IVg and a first process water stream Iliq, scrubbing in one or more scrubbing apparatuses the fourth cracking gas stream IVg to remove solids, thus obtaining process water streams IIliq, or IIliq and IIIliq, and a product gas stream VIg, combining process water streams Iliq, IIliq, IIIliq thus providing a combined process water stream IVliq, recycling the combined process water stream IVliq partly as stream Vliq into the total quench and partly as stream VIliq to cleaning by partial vaporization in a one-stage flash vessel that being vaporizes stream VIliq in a proportion of 0.01 to 10% by weight, based on the total weight thereof, to obtain a cleaned process water stream VIIliq, cooling with a re-cooling device cleaned process water stream VIIliq and partly recycling it as stream VIIIliq into one or more of the one or more scrubbing apparatuses, and partly discharging the rest as stream IXliq.