公开(公告)号：US10010866B1

公开(公告)日：2018-07-03

申请号：US15709330

申请日：2017-09-19

Applicant: KING SAUD UNIVERSITY

Inventor： Usman Ali Rana ,  Arfat Anis ,  Ayman Nafady ,  Saeed M. Al-Zahrani

IPC: B01J21/18 ,  C10B53/02 ,  B01J37/08 ,  B01J27/14 ,  B01J37/04 ,  B01J27/24

CPC classification number: B01J21/18 ,  B01J27/14 ,  B01J27/228 ,  B01J27/24 ,  B01J35/002 ,  B01J35/1014 ,  B01J35/1019 ,  B01J35/1061 ,  B01J37/04 ,  B01J37/084 ,  C01B32/00 ,  C01B32/05 ,  C01P2002/70 ,  C10B53/02 ,  Y02E50/14

Abstract: The nitrogen and phosphorus co-doped crystalline carbon materials are prepared by a template-free method that includes pyrolizing a precursor mixture including a carbon source, a nitrogen source, and a phosphorus source. The method involves mixing known amounts of the precursor components, dissolving the precursor mixture in deionized water, distilling solvent from the aqueous mixture, and vacuum drying the residue to a dry solid mixture. The mixture is then carbonized by pyrolysis at 900° C. in an argon atmosphere to obtain a nitrogen and phosphorus co-doped crystalline carbon material. The principles of the method are illustrated by a precursor mixture of sucrose, urea, and ammonium dihydrogen phosphate (NH4H2PO4). The amount of ammonium salt in the precursor mixture plays a key role in controlling the crystallinity, morphology, and composition of the N/P co-doped crystalline carbon material.

公开(公告)号：US11638923B1

公开(公告)日：2023-05-02

申请号：US17016978

申请日：2020-09-10

Applicant: KING SAUD UNIVERSITY

Inventor： Saeed Mohammed Al-Zahrani ,  Arfat Anis ,  Ranjan Kumar Dwari

IPC: B03D1/006 ,  B03D1/016 ,  C01B25/12 ,  B03D1/008 ,  B03D1/012 ,  B03D1/02 ,  B03D1/014

Abstract: The flotation reagents from acidic olive oil are made by transesterification of acidic olive oil. Acidic olive oil is olive oil having an acid value high enough to render it unsuitable for consumption, typically greater than 3.3% and/or between 3.3-7%. Transesterification of the olive oil with methanol converts fatty acids in the olive oil to an ester fraction and a glycerol fraction. The ester fraction may be sulfonated and used as the collector in a reverse flotation process, selectively removing the carbonate gangue from phosphate-carbonate rock in the froth, leaving phosphates in the sink. The glycerol fraction may be used without modification as the collector in the reverse flotation process. Both fractions are highly selective for carbonates, substantially reducing loss of phosphates in the froth.