Layered oligomerization catalyst system
AssigneeUop LLC
InventorsRobert R. Frame, Den-Yang Jan, Hayim Abrevaya
Life of this patent
Estimating the term…
Abstract
A process is disclosed for the oligomerization of light olefins to higher olefins. The process uses a catalyst that has an inert core and a thin layer of molecular sieve applied to the inert core. The molecular sieve is a crystalline silicoaluminate or metalloaluminophosphate and provides the acid sites for the oligomerization reactions. The thin layer provides for more selective control and limits the amount of oligomerization for liquid phase oligomerization processes.
Claims29
A process for oligomerizing a feedstream comprising light olefins comprising:
- contacting the feedstream with a catalyst at oligomerization conditions to yield a higher olefin product, the catalyst comprising a layered structure characterized by an inner core comprising an inert material, and an outer layer bonded to the inner core and comprising a crystalline silicoaluminate or metalloaluminophosphate molecular sieve characterized by a 3-dimensional framework structure and having a chemical composition on an anhydrous basis expressed by an empirical formula of:
- (ELxAlYPz)O2,
- where EL is an element selected from the group consisting of silicon, magnesium, zinc, iron, cobalt, nickel, manganese, chromium and mixtures thereof;
- “x” is the mole fraction of EL and has a value of at least 0.005;
- “y” is the mole fraction of Al and has a value of at least 0.01;
- “z” is the mole fraction of P and has a value from 0 to about 0.6;
- EL is silicon when z=0;
- and x+y+z=1, where the outer layer is bonded to the inner core using a bonding agent selected from the group consisting of polyvinyl alcohol, hydroxyl propyl cellulose, methyl cellulose, and carboxy methyl cellulose the molecular sieve having been washed at washing conditions with a strong acid having a pKa of less than about 2.0.
A process for oligomerizing a feedstream comprising light olefins comprising:
- contacting the feedstream with a catalyst at oligomerization conditions to yield a higher olefin product, the catalyst comprising a layered structure characterized by an inner core comprising an inert material, and an outer layer bonded to the inner core and comprising a crystalline silicon aluminophosphate molecular sieve and having a chemical composition on an anhydrous basis expressed by an empirical formula of:
- (SixAlyPz)O2
- where “x” is the mole fraction of Si and has a value of at least 0.005;
- “y” is the mole fraction of Al and has a value of at least 0.01;
- “z” is the mole fraction of P and has a value from greater than 0 to about 0.6;
- where the outer layer is bonded to the inner core using a bonding agent selected from the group consisting of polyvinyl alcohol, hydroxy propyl cellulose, methyl cellulose, methyl cellulose, and carboxy methyl cellulose the molecular sieve having been washed at washing conditions with a strong acid having a pKa, of less than about 2.0.
Dependencies are inferred from the claim text.