Back to results
US 6,652,832 B2Granted
Synthesis of ZSM-12
AssigneeExxonMobil Oil Corporation
InventorAndrzej Mariusz Malek
Life of this patent
Estimating the term…
Abstract
This invention provides a process for the synthesis of ZSM-12 using the N,N-dimethylhexamethyleneimine cation as a directing agent. The process enables ZSM-12 to be produced at silica/alumina molar ratios below 50 with little or no co-production of impurity phases. Small crystal forms of ZSM-12 can also be produced using the process of the invention.
Claims9
A process for synthesizing the crystalline material ZSM-12 which comprises the steps of:
- (i) preparing a mixture capable of forming said material, said mixture comprising sources of alkali or alkaline earth metal (M), an oxide of trivalent element (X), an oxide of tetravalent element (Y), hydroxyl (OH−) ions, water and N,N-dimethylhexamethyleneimine cations (R), wherein said mixture has a composition, in terms of mole ratios, within the following ranges:
- YO2/X2O3 = at least 30 H2O/YO2 = 30-70 OH−/YO2 = 0.15-0.45 M/YO2 = 0.15-0.45 R/YO2 = 0.20-0.55,
- (ii) maintaining said mixture under sufficient conditions until crystals of said material are formed;
- and
- (iii) recovering said crystalline material from step (ii).
2 more elements
Dependencies are inferred from the claim text.