Process for preparing ethene
AssigneePetroleo Brasileiro S.A. - Petrobras
InventorsHelcio V Valladares Barrocas, Joao B. de Castro M. da Silva, Ruy Coutinho de Assis
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Abstract
The object of the present invention is the preparation of ethene in the presence of catalysts using adiabatic reactors at high temperature. Such adiabatic reactors may be used in parallel or be disposed in series or arranged in parallel series assemblies or only a single reactor may be used. The process of the invention allows the use of ethyl alcohol diluted with a sensible heat carrying fluid as feeding material. Said sensible heat carrying fluid is introduced into the reactor simultaneously with the feed, supplying the heat necessary for the performance of the reaction.
Claims12
Process for preparing ethene by dehydrating ethyl alcohol in the presence of catalyst, characterized in that ethyl alcohol is heated by indirect heat exchange, up to a temperature in the range from 180.degree.-600.degree. C., introducing thus heated ethyl alcohol into one or more adiabatic reactors containing in its interior a catalyst fixed bed, said adiabatic reactor being maintained in a pressure range between 0.2 and 20 kg/cm.sup.2 absolute, and said fixed catalyst bed being maintained at a temperature comprised within the range from 600.degree. C. on the top to 180.degree. C. in the bottom, by means of a sensible heat carrying stream heated up to a temperature up to 800.degree. C., the weight ratio between the sensible heat carrying fluid stream and the stream of ethyl alcohol varies within a 0.2:1 to 20:1 range, and the ratio between the amounts of ethyl alcohol and the catalyst is comprised within a range from 10 to 0.01 g/h of ethyl alcohol per gram of catalyst;
- removing the effluent from said adiabatic reactor and sending the same to the purification step.
In a process for preparing ethene by the dehydration of ethanol, the improvement which comprises providing the required heat for the reaction directly to the reaction by means of simultaneously introducing the ethanol feed and a heat-carrying fluid into at least one adiabatic reactor containing a fixed bed catalyst.
Dependencies are inferred from the claim text.