Process for the separation of light olefins from paraffins
AssigneeSnamprogetti S.p.A.
InventorsCarmen Pirovano, Domenico Sanfilippo, Francesco Saviano, Laura Piovesan
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Abstract
Process for the separation of light olefins from paraffins contained in mixtures, optionally also containing hydrogen, comprising bringing said mixtures into contact with an aqueous solution of one or more compounds of silver, preferably silver nitrate, and one or more ferric compounds, preferably ferric nitrate.
Claims13
A process for the separation of light olefins from paraffins contained in mixtures containing hydrogen, comprising bringing said mixtures into contact with an aqueous solution of one or more silver compounds and one or more ferric compounds.
A process for the separation of light olefins from paraffins contained in mixtures also containing hydrogen and/or other inert products which comprises the following steps:
- subjecting the mixture to a separation by absorption in a suitable hydrocarbon absorbent in order to separate the hydrogen and/or other inert products from the hydrocarbons contained therein;
- subjecting the mixture separated from the hydrogen and/or other inert products to a liquid/liquid extraction using a suitable extracting agent thereby obtaining a stream containing paraffins and the hydrocarbon absorbent and a stream containing the light olefins and extracting agent;
- subjecting the stream containing paraffins and hydrocarbon absorbent to regeneration in order to obtain a stream containing mainly said hydrocarbon absorbent, which is recycled to the separation step, and a stream containing mainly paraffins;
- subjecting the stream containing light olefins and the extracting agent to regeneration in order to obtain a stream containing mainly the extracting agent, which is recycled to the liquid-liquid extraction step, and a stream mainly containing light olefins.
A process for the separation of light olefins from paraffins contained in mixtures also containing hydrogen and/or other inert products, which comprises the following steps:
- subjecting the mixture of light olefins and paraffins, after being at least partially liquefied, to an absorption in an absorption column by means of a paraffin absorbent identical to the paraffins contained in the mixture and in a greater quantity than said paraffins, thereby obtaining, at the head of the absorption column, inert products and/or hydrogen and, at the bottom of the absorption column, a stream containing olefins and paraffins also comprising the paraffin absorbent;
- subjecting the bottom stream to a liquid-liquid extraction in an extraction column using a suitable extracting agent, obtaining at the head of the extraction column, a stream mainly containing paraffins comprising the paraffin absorbent and, at the bottom of the extraction column, a stream mainly containing olefins and the extracting agent;
- subjecting the stream containing olefins and the extracting agent to stripping whereby the olefins are separated from the extracting agent, which is recycled to the liquid-liquid extraction step.
Dependencies are inferred from the claim text.