PROCESS OF ASH REMOVAL FROM COAL TO AVOID LARGE QUANTITIES OF HYDROGEN FLUORIDE ON-SITE

• Main Authors: ERIC STEPHEN KAUFMAN, DRAPER SAM DAVID, NEWKIRK MICHAEL DAVID, CHANDRASHEKHAR GANPATRAO SONWANE
• Format: Patent
• Language: English
• Published: 14.04.2011
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMISTRY; COMPOUNDS THEREOF; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; INORGANIC CHEMISTRY; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; NON-METALLIC ELEMENTS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

PROBLEM TO BE SOLVED: To provide a method and system for removing fly ash by treating coal with hydrogen fluoride and thereafter, regenerating substantially all of the hydrogen fluoride used during the process (thereby significantly reducing the amount of HF on site). SOLUTION: An exemplary method includes: a step of charging at least one reaction vessel (107, 108, 109) with coal (110, 111, 112) containing fly ash; a step of feeding hydrogen fluoride into the reaction vessel to form a first reaction mixture of soluble reaction products, insoluble fluoride compounds, and initial clean coal; a step of separating out the first soluble and the first insoluble reaction products; a step of feeding nitric acid into the same reaction vessel to react with any remaining fly ash component and separating out those second reaction products; and a step of regenerating substantially all of the hydrogen fluoride used in the first fluoride reaction. COPYRIGHT: (C)2011,JPO&INPIT