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[siretb]

You have only the small numbers beacuse you have found only the first branch of the curve. Anilin and water are not completly miscible and in a certain range, soon in fact, two liquid layers will appear.
One liquid layer will be water rich (in fact almost pure water) and the other will be anilin rich.
As the two liquid phase behave as is they were alone, it means, that you will see a plateau, a flat line on your diagram where the overall x composition varies, but where the y composition remains constant. (horizontal flat line on a Mc Cabe & Thiele) . Up to a concentration where there is enough anilin to dissolve the water, where a unique liquid phase exists and then the y curve rises again.
This behavior is typical of systems with limited reciprocical solubility.

You need to find the other branch, unless you are interested only in one domain. If you strip, as you can see you will enrich the gas phase, and reach the point where the two layers separare. At this poin a decanter is used, you remove one layer and reflux the other.
You may construct the Mac Cabe & Thiele diagram as usual.