Counaclogen:
There are a lot of points we can takeit from this search:
1- The first steam cracker constraction was in 1920 in which capacity was a few thoyusand tons per year.t Today canit beis able to build a two-miillion tons per year.
2- The steam cracking process uses a low value feed such as :(naphtha ,ethane, vacuum distillates, gas condensate ) (IFB School) but it produces a high value product likes olefins (ethylene, propylene ,butadiene ,butane ,gasoline ,toluene, xylene ,....,)
3- sStream cracker's hasve four main zones: hot zone, compression zone, cold zone, and selective hydrogenation zone.
4- The furnace is the main equipment in a steam cracker, which is the area of cracking and that costs around 35% ofrom the total cost.
5- We can use kKuff cCondensate as feedstock of steam craker's. tThat yield will be 33% ethylene, 17 propylene, ,6% butadiene, 5% other cC4s, 19%gasoline and 3% fuel oil.
6- When we use kKuff cCondensate as feedstock of a steam cracker that productes almost similar to a naphtha feed.
7- There are requirements and conditions: The temperature should be between 800-850 oc or more than that, due to haveing more coke. Reaction Retention time is limited to several tenths of second to reduce formation of heavy aromatic products and coke. The pressure should be low around 2-3 bar abs.
This is to prevent hydrocarbon species from combining among themselves to fromthe hydrocarbon and coke. The steam dilution should be 0.6 ton of steam for one ton of feedstock.
8- There are three common recovery section schemes of typical steam cracker plant: fFront -end demethanizers, front -end. Demethanizer and front –end depropanizer.
9- All petrochemical products prices depend ofn the supply and demand balance and economic situation.
10- In thea high severity scenario the total cost to produce one ton of ethylene is 284$ and in another low severity condition the total cost to produce one ton of ethylene is 162$. That is due to the high quantity of by-product.
11- The low severity scenario payback period is 9 years better than high severity scenario pay back period which 12 years.