In an olefins plant, propylene is generated by the same pyrolysis and purification process as ethylene.
Propylene was invented in 1950 by Fontana and is characterized by disorderly structure with an elevated molecular weight.
Ethane-feed crackers can be less complex than propane- and heavier-feed crackers due to the production of fewer by-products. That is, the ethane cracker produces 80% ethylene with the other two principal by-products being hydrogen and methane. Generally, the C3 and heavier products are not produced in sufficient quantities to justify product recovery. On larger scale ethane crackers, the recovery of propylene is typically justified; however, all other by-products are sent to fuel. This can significantly simplify the recovery section of the cracker.
Butene via Ethylene Dimerization - Chemical Engineering
In this integration, n-butene from dimerization is reacted over a metathesis catalyst with ethylene to form two molecules of propylene, as shown in the block flow diagram, in Figure 1.
2,6-xylenol, 576-26-1 - The Good Scents Company
N2 - A metathesis process was developed to efficiently convert low-value olefin streams produced as by-products in olefin production processes into higher value products (ethylene, propylene, and high molecular weight linear olefins). Pilot plant results indicated that a reactive distillation process will produce high yields of the desired products while minimizing the process energy input. Bench scale experiments were conducted to supplement the metathesis reaction knowledge base and to develop an optimum catalyst regeneration methodology. The results from both experimental units served as the framework for an AspenPlus® simulation.
Propylene Production via Metathesis by Intratec …
As downstream product demand shifts, the product mix from the petrochemical complex will need to also shift. As the amount of ethylene produced from ethane and propane increases, the co-current production of propylene will drop. This drop, coupled with a higher growth rate for propylene derivatives, will increase the demand for on-purpose propylene production. This on-purpose demand will be met in part by technologies licensed by Lummus, including OCT and Ethylene Dimerization (discussed above), as well as CATOFIN® propane dehydrogenation and MTO. (The latter produces a propylene-to-ethylene ratio of between 1.0 and 1.2.)
This alternative path to the traditional steam cracking or f..
For instance, the dimerization unit may be integrated with a metathesis unit, to produce polymer-grade propylene, a commodity chemical with a high added value.
Technology Ecnomics: Propylene Production via ..
Propylene is second only to ethylene as an important raw material for producing other organic chemicals and, like ethylene, it has virtually no use “as-is”.