Cracking And Fractional Distillation Flashcards
What process is used to split mixtures with different boiling point
Fractional distillation
What process is used to split the fractions In crude oil
Fractional distillation
What are the 2 types of cracking
Thermal and catalytic cracking
What is required for thermal cracking
700-1200K and pressures up to 7000KPa
One disadvantage of thermal cracking
High cost due to temperature and pressure
What is required for catalytic cracking
Approx 720K,Low pressure (>atmospheric) and a zeolite catalyst
What is a zeolite catalyst
Silicon dioxide and aluminium oxide aka aluminosilicates
What structure are zeolite catalysts
Honeycomb for great surface area
What are the main products of catalytic cracking
Branched alkanes,cycloalkanes and aromatic compounds
What Needs to happen to products of catalytic cracking
They need to be fractionally distilled to separate them again
What are the reasons for cracking
It helps fulfil the demand of some of the fractions of crude oil that are in high demand. It also creates feedstocks for industry
Why do some chainlengths of alkanes have greater BP than others
Due to intermolecular forces between molecules (the longer the stronger)
