Toluene free preparation of SMAO: heating with TMA to improve activity
AssigneeExxonMobil Chemical Patents Inc.
InventorsFrancis C. Rix, Lubin Luo, Ky Ka Le
Life of this patent
Estimating the term…
Abstract
A method including: contacting a support material including absorbed water with trimethylaluminum (TMA) in an aliphatic hydrocarbon; removing the aliphatic hydrocarbon by distillation at a pressure greater than or equal to 0.5 atm; heating, at a temperature ranging from about 25° C. to about 200° C., a reaction product of the support material and the TMA in a presence of TMA, wherein the TMA includes TMA in an amount of about 2-10 mmol TMA per gram of the support material in excess of an amount that reacts with the support material absorbed with water; and removing excess TMA.
Claims13
A method comprising:
- contacting a support material including absorbed water with trimethylaluminum (TMA) in an aliphatic hydrocarbon;
- removing the aliphatic hydrocarbon by distillation at a pressure greater than or equal to 0.5 atm;
- heating, at a temperature ranging from about 25° C. to about 200° C., a reaction product of the support material and the TMA in a presence of TMA, wherein the TMA includes TMA in an amount of about 2-10 mmol TMA per gram of the support material in excess of an amount that reacts with the support material absorbed with water;
- impregnating the support material with about 2-10 mmol water per gram of the support material;
- and
- removing excess TMA.
A method comprising:
- contacting a support material including absorbed water with trimethylaluminum (TMA) in an aliphatic hydrocarbon;
- removing the aliphatic hydrocarbon by distillation at a pressure greater than or equal to 0.5 atm;
- heating, at a temperature ranging from about 25° C. to about 200° C., a reaction product of the support material and the TMA in a presence of TMA, wherein the TMA includes TMA in an amount of about 2-10 mmol TMA per gram of the support material in excess of an amount that reacts with the support material absorbed with water;
- and
- removing excess TMA, wherein the contacting is performed at a temperature less than or equal to −5° C. with the support material being a silica, dehydrated at greater than or equal to 600° C., that includes 2-6 mmol absorbed water per gram silica, and wherein the heating is performed at a temperature ranging from about 70° C. to 90° C., with an excess amount of the TMA of about 7 mmol per gram silica.
Dependencies are inferred from the claim text.