How AND UNDER WHAT CONDITIONS DOES SULPHURIC ACID REACT WITH BENZENE AND ETHYLENE? Give equation , the condition s under which benzene can be converted to styrene and acetophenone. H=1 ;C= 12.
H2SO4 + C6H6 <=> C6H5-SO3H + H2O heat.catalyst.
Similarly, fuming sulphuric acid absorbs ethylene at room temperature to form ethyl hydrogen sulphate, with much evolution of heat.
H2SO4 + H2C=CH2 <=> H3C-CH2-SO4H
Another developing route to styrene is via benzene and ethane. This process is being developed by Snamprogetti S.p.A. and Dow. Ethane, along with ethylbenzene, is fed to a dehydrogenation reactor with a catalyst capable of simultaneously producing styrene and ethylene. The dehydrogenation effluent is cooled and separated and the ethylene stream is recycled to the alkylation unit. The process attempts to overcome previous shortcomings in earlier attempts to develop production of styrene from ethane and benzene, such as inefficient recovery of aromatics, production of high levels of heavies and tars, and inefficient separation of hydrogen and ethane. Development of the process is ongoing.
C6H6 + C2H6 --> C6H5-C2H5
C6H5-C2H5 ---> C6H5CH=CH2 + H2
By Friedel crafts acylation, ie treating benzene with any CH3COX, where X is a halide (AlCl3 t)
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