Dehydrogenation process at reduced hydrogen to hydrocarbon ratios
OwnerChristopher DiGiulio, Manuela Serban +1inventors
InventorsChristopher DiGiulio, Manuela Serban, Clayton C. Sadler
Life of this patent
Estimating the term…
Abstract
Processes for dehydrogenation of a hydrocarbon feedstock are described. The process can be run at lower H2/HC ratios and lower RITs while maintaining coke production at the same level as operation at higher H2/HC ratios and higher RITs without decreasing the yield per pass. Acceptable levels of coke were achieved when operating the process at low hydrogen to hydrocarbon molar ratio in the range of 0.01 to 0.40 and reactor inlet temperatures in the range of 500°-645° C. The process uses a low coke catalyst.
Claims18
A process for dehydrogenation of a hydrocarbon feedstock, the process comprising:
- passing a feed stream comprising hydrogen and paraffins into a dehydrogenation zone comprising at least one reactor containing a dehydrogenation catalyst maintained at dehydrogenation conditions to produce a dehydrogenation zone product stream comprising hydrogen, paraffins, and olefins, wherein the dehydrogenation catalyst comprises a first component selected from the group consisting of Group VIII noble metals and mixtures thereof, a second component selected from the group consisting of alkali metals or alkaline-earth metals and mixtures thereof, and a third component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium and mixtures thereof;
- and a support to carry the first, second, and third components thereby forming a catalyst particle wherein the catalyst particle comprises a plurality of pores, wherein at least 15% of the pores have an average pore diameter between 200 to 350 Angstroms, wherein the catalyst particle has a median diameter between 1.6 mm and 2.5 mm, and an apparent bulk density between 0.6 and 0.3 g/cc;
- wherein the dehydrogenation conditions in the at least one reactor include a hydrogen to hydrocarbon molar ratio in a range of 0.01 to 0.40 and a reactor inlet temperature in a range of 500°-645° C.
A process for dehydrogenation of a hydrocarbon feedstock, the process comprising:
- passing a feed stream comprising hydrogen and paraffins into a dehydrogenation zone comprising at least one reactor containing a dehydrogenation catalyst maintained at dehydrogenation conditions to produce a dehydrogenation zone product stream comprising hydrogen, light ends, paraffins, and olefins, wherein the dehydrogenation catalyst comprises a first component selected from the group consisting of Group VIII noble metals and mixtures thereof, a second component selected from the group consisting of alkali metals or alkaline-earth metals and mixtures thereof, and a third component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium and mixtures thereof;
- and a support to carry the first, second, and third components thereby forming a catalyst particle wherein the catalyst particle comprises a plurality of pores, wherein at least 15% of the pores have an average pore diameter between 200 to 350 Angstroms, wherein the catalyst particle has a median diameter between 1.6 mm and 2.5 mm, and an apparent bulk density between 0.6 and 0.3 g/cc;
- wherein the dehydrogenation conditions in the at least one reactor include a hydrogen to hydrocarbon molar ratio, a reactor inlet temperature, and a coke index, wherein the hydrogen to hydrocarbon molar ratio is in a range of 0.01 to 0.4, wherein one dehydrogenation condition is adjusted based on the other two dehydrogenation conditions, and wherein the coke index is determined by measuring coking for a range of reactor inlet temperature and hydrogen to hydrocarbon molar ratio combinations and determining a correlation between the reactor inlet temperature and the hydrogen to hydrocarbon molar ratio.
Dependencies are inferred from the claim text.