Certains contenus de cette application ne sont pas disponibles pour le moment.
Si cette situation persiste, veuillez nous contacter àObservations et contact
1. (WO2018063881) PROCÉDÉS ET APPAREILS POUR LA PRODUCTION DE PRODUITS AROMATIQUES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. An apparatus for producing para-xylene, wherein the apparatus comprises:

a) an isomerization unit to provide an isomerized stream;

b) an isomerate stripper column in communication with the isomerization unit to provide an isomerate stripper overhead stream comprising C6- hydrocarbons in an isomerate overhead line and an isomerate stripper bottoms stream in an isomerate bottoms line;

c) a dividing wall naphthene splitter column in communication with the isomerate bottoms line to provide an overhead naphthene splitter stream comprising the C8 naphthenes and C7 aromatic hydrocarbons in a naphthene splitter overhead line and a naphthene splitter sidedraw stream comprising C8 aromatic isomers in a naphthene splitter sidedraw line; and

d) an extractive distillation column in communication with the naphthene splitter overhead line to provide a recycle feedstream comprising the C8 naphthenes in a recycle line and an extract stream comprising the C7 aromatic hydrocarbons in an extract line.

2. The apparatus of claim 1, wherein the dividing wall naphthene splitter column comprises a dividing wall having an upper end and a lower end that divides the naphthene splitter column into a feed section and a product section.

3. The apparatus of claim 2, wherein the dividing wall naphthene splitter column comprises one or more vapor-liquid contacting stages.

4. The apparatus of claim 3, wherein the lower end of the dividing wall extends to a last stage of the one or more vapor-liquid contacting stages.

5. The apparatus of claim 2, wherein the feed section of the dividing wall naphthene splitter column is in downstream communication with the isomerate bottoms line.

6. A process for the production of para-xylene, wherein the process comprises: a) introducing a raffinate product stream comprising C8 aromatic isomers to an isomerization unit to provide an isomerized stream, wherein the isomerized stream is produced in the presence of an ethylbenzene (EB) isomerization catalyst;

b) passing the isomerized stream to an isomerate stripper column to provide an isomerate stripper overhead stream comprising C6. hydrocarbons and an isomerate stripper bottoms stream;

c) passing the isomerate stripper bottoms stream to a dividing wall naphthene splitter column to provide an overhead naphthene splitter stream comprising the C8 naphthenes and C7 aromatic hydrocarbons and a naphthene splitter sidedraw stream comprising C8 aromatic isomers and less than 1 wt% of C9+ alkylaromatic hydrocarbons;

d) passing the overhead naphthene splitter stream to an extractive distillation column to provide a recycle feedstream comprising the C8 naphthenes and an extract stream comprising the C7 aromatic hydrocarbons; and

e) passing the recycle feedstream to the isomerization unit.

7. The process of claim 6, wherein the naphthene splitter sidedraw stream comprises less than 0.7 wt% of C9+ alkylaromatic hydrocarbons.

8. The process of claim 6, wherein the dividing wall naphthene splitter column comprises a dividing wall having an upper end and a lower end that divides the naphthene splitter column into a feed section and a product section.

9. The process of claim 8, wherein the dividing wall naphthene splitter column comprises one or more vapor-liquid contacting stages.

10. The process of claim 9, wherein the lower end of the dividing wall extends to a last stage of the one or more vapor-liquid contacting stages.