Introduction of Ammonium chloride

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jingsong
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Introduction of Ammonium chloride

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Styrene, an organic compound with the chemical formula C6H5CH=CH2, is also known as vinyl benzene. This derivative of benzene is a colorless oily liquid that evaporates easily and has a sweet smell, although high concentrations confer a less pleasant odor.
Laboratory synthesis of styrene entails the decarboxylation of cinnamic acid. Styrene was first prepared by this method. Styrene also can be produced from toluene and methanol, which are cheaper raw materials than those in the conventional process. It is reported that an approximately 9:1 mixture of styrene and ethylbenzene is obtained, with a total styrene yield of over 60%.
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. Web Page NameWeb Page Name
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