초록

Process for the production of styrene which comprises:

대표청구항 ▼

[ We claim:] [1.] A process for the production of styrene which comprises:a) feeding to an alkylation unit a stream of benzene and a stream of recycled product containing ethylene;b) mixing the stream at the outlet of the alkylation unit, containing ethylbenzene, with a stream containing ethane;c) f

[ We claim:] [1.] A process for the production of styrene which comprises:a) feeding to an alkylation unit a stream of benzene and a stream of recycled product containing ethylene;b) mixing the stream at the outlet of the alkylation unit, containing ethylbenzene, with a stream containing ethane;c) feeding the mixture thus obtained to a dehydrogenation unit containing a dehydrogenation catalyst capable of contemporaneously dehydrogenating ethane and ethylbenzene to give a product containing ethylene and styrene respectively;d) feeding the product leaving the dehydrogenation unit to a separation section to produce a stream containing styrene and a stream containing ethylene;e) recycling the stream containing ethylene to the alkylation unit,wherein the dehydrogenation catalyst comprises gallium and platinum supported on alumina modified with silica, and in the following amounts:i) 0.1-34% by weight, of Ga.sub.2 O.sub.3 ;ii) 1-99 ppm by weight of platinum;iii) 0.05-5% by weight of an alkaline and/or earth-alkaline oxide;iv) 0.08-3% by weight of silica;the remainder being alumina, wherein said alumina is in delta or theta phase or in a mixture of delta+theta, theta+alpha or delta+theta+alpha phases, modified with silica, and wherein the catalyst has a surface area of less than 100 m.sup.2 /g, determined by means of the BET method.