# US 11,078,367 B2 · Hydrophobic surface modified aluminas and method for making thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,367 B2 - Document ID: US11078367B2 - Status: Granted - Kind: B2 - Application number: 16/608,483 - Filed: 2018-06-12 - Published: 2020-02-20 - Granted: 2021-08-03 - Earliest claimed: 2017-06-15 - Assignees: Sasol (USA) Corporation - Applicants: Sasol (USA) Corporation - Inventors: Maria Roberta Rabaioli; Anthony Mai; Ryan Loscutova - Web page: https://patentgrep.com/patent/US11078367B2 ## CPC - C01F 7/021: After-treatment of oxides or hydroxides - C09C 1/407: {Aluminium oxides or hydroxides} - C01F 7/30: Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds - C09C 3/08: Treatment with low-molecular-weight {non-polymer} organic compounds {(C09C3/006, C09C3/048 take precedence)} - C01P 2002/60: Compounds characterised by their crystallite size - C01P 2002/82: by IR- or Raman-data - C01P 2004/03: obtained by SEM - C01P 2004/20: extending in two dimensions, e.g. plate-like - C01P 2004/38: cube-like - C01P 2004/54: Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension - C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer - C01P 2006/12: Surface area - C01P 2006/14: Pore volume - C01P 2006/80: Compositional purity - C01P 2006/82: water content - C01P 2006/90: Other properties not specified above - C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00}) - C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS} - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS ## Abstract A method of producing a hydrophobic porous alumina by: i) providing a slurry comprising an alumina compound, the slurry having a pH equal to or greater than 7; ii) adding an organic composition comprising carboxylic acids with alkyl hydrocarbon chains having a carbon length less than 14 to the slurry to form an acidic modified slurry; the acidic modified slurry having a pH of between 3 and less than 7; iii) hydrothermally aging the acidic modified slurry to form a hydrothermally aged slurry; and iv) drying the hydrothermally aged slurry. ## Claims ### Claim 1 A method of producing a hydrophobic porous alumina comprising the steps of: i) providing a slurry comprising an alumina compound, the slurry having a pH equal to or greater than 7; ii) adding an organic composition comprising carboxylic acids with alkyl hydrocarbon chains having a carbon length less than 10, to the slurry to form an acidic modified slurry; the acidic modified slurry having a pH of between 3 and less than 7; iii) hydrothermally aging the acidic modified slurry to form a hydrothermally aged slurry; and iv) drying the hydrothermally aged slurry. ### Claim 2 (depends on 1) The method of claim 1 wherein the alumina compound includes aluminum oxide hydroxide (AlOOH), boehmite or pseudoboehmite. ### Claim 3 (depends on 1) The method of claim 1 wherein the organic composition comprises carboxylic acids with alkyl hydrocarbon chains having a carbon length of 9. ### Claim 4 (depends on 1) The method of claim 1 wherein the organic composition comprises carboxylic acids with alkyl hydrocarbon chains having a carbon length of 8 or less than 8. ### Claim 5 (depends on 1) The method of claim 1 in which the acid modified slurry has a pH of between 3.5 and 5.5. ### Claim 6 (depends on 1) The method of claim 1 wherein, the organic composition content relative to the content of alumina compound in the acidic modified slurry is between 0.5 and 10% wt. ### Claim 7 (depends on 1) A porous hydrophobic alumina prepared according to the method of claim 1. ### Claim 8 (depends on 1) A composition including a porous hydrophobic alumina prepared according to the method of claim 1 and a substrate. ### Claim 9 (depends on 8) The composition of claim 8 wherein the substrate includes polymers, crosslinked polymers, nylon resins, and acrylic resins e.g. polymethylmethlacrylate (PMMA), polystyrenes, styrene acrylate resins, polyester resins, waxes, polyethylene, polypropylene, polycarbonate, polyurethane, polyethylene terephthalate, rubber, epoxy resins, silicone, cellulose, fabric, polytetrafluoroethylene, silica glass particles, metal oxides, ceramics and carbon substrates. ### Claim 10 A porous hydrophobic alumina including the following characteristics: i) an aspect ratio of between 1.80 and 5.0; ii) an average pore value between 0.55 cc/g and 2.0 cc/g; iii) a specific surface area of between 30_m2/g and 300 m2/g; and iv) an organic composition content between 0.5 and 10 wt. % relative to the content of alumina.