Jul 21, 2017 By far the greatest proportion of the vapour is steam, which sometimes occurs almost to the exclusion of other gaseous products. Such, at least, is the usual and probably correct view, though it is opposed by A. Brun, who regards the volcanic vapours as chiefly composed of chlorides with steam in only subordinate amount. Steam cracking of naphtha over six different catalysts consisting of mixtures of alumina and metal oxides, such as CaO, TiO2, SrO, MgO, Cr2O3, and MnO, has been tested, and the results are compared with those for a ceramic packed bed reactor.
Simple Steam Cracker Yield help needed based on feed qualities
Simple Steam Cracker Yield help needed based on feed qualities
Hi,
I am currently undertaking a project of understanding and modelling an Ethylene cracker (with either an LPG or naphtha feedstock).
I've found data that has given me simple mass balances based on generic yield data for both naphtha (typical Europe/US?)and ethane (typical Middle East?) feeds.
I've a few problems as I progress:
1) Whilst i've a mass balance across a steam cracker using a naphtha feed this does not take in to account the naphtha feed quality. I've heard of companies using online analysis and software such as SPYRO to optimise their cracking. This is way beyond the level my project needs - are there some simple equations I can use that take naphtha qualities (I am guessing PIONA, distillation curve and density) and skew the product yields accordingly?
2) Some steam crackers use LPG instead of naphtha. Is this pure ethane, propane or butane, or mixes of these? Do steam crackers running LPG hold individual stocks of these and blend as required for whatever yield they are aiming for? Assuming steam crackers take different qualities of LPG are there again simple equations that would help me skew the yield of the cracker based on certain feed qualities?
Sorry this is a big meaty question but i've seen there are a few steam cracker process engineers floating around on here and can't find these questions asked previously.
Many thanks in advance,
Matt
I am currently undertaking a project of understanding and modelling an Ethylene cracker (with either an LPG or naphtha feedstock).
I've found data that has given me simple mass balances based on generic yield data for both naphtha (typical Europe/US?)and ethane (typical Middle East?) feeds.
I've a few problems as I progress:
1) Whilst i've a mass balance across a steam cracker using a naphtha feed this does not take in to account the naphtha feed quality. I've heard of companies using online analysis and software such as SPYRO to optimise their cracking. This is way beyond the level my project needs - are there some simple equations I can use that take naphtha qualities (I am guessing PIONA, distillation curve and density) and skew the product yields accordingly?
2) Some steam crackers use LPG instead of naphtha. Is this pure ethane, propane or butane, or mixes of these? Do steam crackers running LPG hold individual stocks of these and blend as required for whatever yield they are aiming for? Assuming steam crackers take different qualities of LPG are there again simple equations that would help me skew the yield of the cracker based on certain feed qualities?
Sorry this is a big meaty question but i've seen there are a few steam cracker process engineers floating around on here and can't find these questions asked previously.
Many thanks in advance,
Matt