Investigation of Associated Structure of Upper Freeport Coal by Solvent Swelling

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products

“…31,32 In good swelling solvents such as NMP and pyridine, coal is capable of swelling to over twice of its original volume, while still retaining its original shape. 33 Good extraction solvents are usually good swelling solvents. Thus, n-methyl pyrrolidone (NMP) and carbon disulfide (CS 2 ) are expected to be good swelling solvents.…”

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products

“…Research by Takanohashi differed in that it concluded coal was a large aggregate, and Takanohashi proposed different mechanisms for describing coal dissolution. 15 Thus, Takanohashi's research suggested that coal is solubilized without breaking covalent bonds.…”

“…21,22 In good swelling solvents such as NMP and pyridine, coal is capable of swelling to over twice of its original volume, while still retaining its original shape. 23 Good extraction solvents are usually good swelling solvents. Thus, n-methyl pyrrolidone (NMP) and carbon disulfide (CS 2 ) are expected to be good swelling solvents.…”

“…24 The ability of a solvent to swell coal is a strong function of the electron donating ability of the solvents. 25 Painter and Shenoy proposed that the swelling of coal takes place by a process of chain disinterspersion. 26 It is postulated that the covalent bonds in the coal matrix act as chains that are stretched by solvents.…”

“…Current models for coal dissolution postulate that the soluble portions of coal occupy the pore space of coal and extraction more or less leaves the existing macro molecular network intact. 39 An aggregated structure of coal would imply a model where the coal structure is irrefragably lost upon dissolution.…”