Improved process for the dehydrogenation of alkyl-aromatic hydrocarbons for the production of vinyl-aromatic monomers
A technology for vinyl aromatics and aromatics, applied in the field of dehydrogenation of ethylbenzene to prepare styrene
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[0056] For example the preparation method of styrene, the carrying out of dehydrogenation reaction is for example as follows, adopts fixed-bed catalyst, by introducing the mixture of ethylbenzene steam and steam in the first reactor, wherein the molar ratio of water / ethylbenzene is 5-15, Preference is given to 6-12, in which partial conversion of ethylbenzene takes place. After controlling the temperature at the target value by means of a heat exchanger, the reaction mixture leaves the first reactor and is introduced into the second reactor. The reaction mixture, at least 50% converted from ethylbenzene, is cooled and condensed before being sent to the purification zone. If desired, a third reactor may be included at the outlet of the second reactor to increase the conversion of ethylbenzene to above 70%.
[0057] The gas from the dehydrogenation reactor, exiting at a temperature of 450-650°C, preferably 550-610°C, is cooled by a series of heat exchangers, the recovered heat ...
Embodiment
[0062] The examples provided are based on a comparison with industrial data for a styrene production plant, which has the advantage of an improved condensing unit, condensing in the shell (referred to as an improved unit), compared to a conventional unit, where the condensing is in the It is carried out in the tube of two series-connected devices, the first cooled with air and the second with water (called the reference device).
[0063] Device conditions are described below.
[0064] The plant includes an ethylbenzene preparation section into which ethylene and benzene are introduced in an AlCl-based 3 In the presence of a catalyst, the reaction pressure is about 0.5MPa, and the reaction temperature is 150°C. The effluent from this reaction section is directed to the separation zone where the separation is based on AlCl 3 catalyst, the stream then enters a distillation section containing 3 multilayered columns. In the first distillation column, the pressure is about 0.6MPa...
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