Method for producing a dealuminized catalyst support
View Patent ↗What is claimed is a dealuminated catalyst carrier, a process for producing a catalyst carrier with reduced aluminum content based on naturally occurring lattice-layer silicates, such as, for example, montmorillonite, as well as a process for the hydration reaction of C 2 - or C 3 -olefins in which said catalyst carrier with reduced aluminium content is used. For acid-catalysed hydration reaction the catalyst carrier is impregnated with phosphoric acid. The improvements according to the invention of the hydration reaction compared to conventional processes include the fact that no aluminium is leached out of the carrier in the presence of the phosphoric acid. As a result no more blockage of the succeeding apparatus due to aluminium phosphate is expected.
1. A method of producing a phosphoric impregnated catalyst/catalyst carrier containing less than 0.3% by weight aluminum comprising impregnating a lattice-layer silicate with an acid, hydrothermally treating the acid-impregnated lattice-layer silicate at a temperature of between 160 and 300° C. and a partial water vapor pressure of between 4 and 80 bar abs , and washing the hydrothermally treated, acid-impregnated, lattice-layer silicate with a wash solution selected from the group consisting of acidic solutions, basic solutions, and neutral solutions, wherein as part of the method, the lattice layer silicate is impregnated with phosphoric acid.
2. The process according to claim 1 wherein said neutral solution is water.
3. The process according to any one of claim 1 or 2 wherein said washing takes place at a temperature of between 20 and 100° C.
4. The process according to claim 3 wherein said washing takes place at a temperature of between 70 and 90° C.
5. The process according to any one of claim 1 or 2 wherein said washing solution comprises hydrochloric acid.
6. The process according to any one of claim 1 or 2 wherein the washed, hydrothermally treated, acid-impregnated, lattice-layer silicate is rinsed with water.
7. The process according to any one of claim 1 or 2 wherein said washing solution comprises water containing up to 30 parts of concentrated hydrochloric acid.
8. The process according to claim 6 wherein said rinsing is conducted until the rinsing water is neutral.
9. The process according to any one of claim 1 or 2 wherein said lattice-layer silicate is purified by burning off adhering organic carbon-containing compounds at a temperature of between 300 and 1000° C. prior to any of the steps set forth in claim 1 .
10. The process according to any one of claim 1 or 2 wherein said hydrothermal treatment is conducted at a temperature of between 220 and 260° C. and a partial water vapor pressure of between 16 and 25 bar abs .