Solvent-refined coal process

Inspection of Products from the Solvent-Refined Coal Process (See Also Table 19.6) 

In the SRC II process, however, the slurry stream is divided into two streams one that is recycled to provide liquid for the coal-slurry mixing and one that is fractionated for recovery of the primary products of the process. The SRC II process has the option of producing various proportions of solid and liquid products (Table 19.6). 

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Solvent Refined Coal Process. Work ia the mid-1960s by the Speacer Chemical Co. (9) and dating the 1970s by the Gulf Chemical Corp. led to two solvent refined coal (SRC) processiag schemes SRC-I for productioa of low ash soHd boiler fuels and SRC-II for distillates, eg, "syn-cmde."... 

Hooks, H.W. Boykin, R.G., Solvent Refined Coal Process Quarterly Technical Progress Report for the period January-March 1978, from Catalytic Inc. to EPRI and DOE, July 1978. 

The development of three-phase reactor technologies in the 1970 s saw renewed interest in the synthetic fuel area due to the energy crisis of 1973. Several processes were developed for direct coal liquefaction using both slurry bubble column reactors (Exxon Donor Solvent process and Solvent Refined Coal process) and three-phase fluidized bed reactors (H-Coal process). These processes were again shelved in the early 1980 s due to the low price of petroleum crudes. 

Solvent-Refined Coal Process. In the 1920s the anthracene oil fraction recovered from pyrolysis, or coking, of coal was utilized to extract 35—40% of bituminous coals at low pressures for the purpose of manufacturing low cost newspaper inks (113). Tetralin was found to have higher solvent power for coals, and the I. G. Farben Pott-Broche process (114) was developed, wherein a mixture of cresol and tetralin was used to dissolve ca 75% of brown coals at 13.8 MPa (2000 psi) and 427°C. The extract was filtered, and the filtrate vacuum distilled. The overhead was distilled a second time at atmospheric pressure to separate solvent, which was recycled to extraction, and a heavier liquid, which was sent to hydrogenation. The bottoms product from vacuum distillation, or solvent-extracted coal, was carbonized to produce electrode carbon. Filter cake from the filters was coked in rotary kilns for tar and oil recovery. A variety of liquid products were obtained from the solvent extraction-hydrogenation system (113). A similar process was employed in Japan during Wodd War II to produce electrode coke, asphalt (qv), and carbonized fuel briquettes (115). 

A Solvent-Refined Coal Process for Clean Utility Fuel... 

The schematic of the recent process technology for the Pittsburgh and Midway Solvent Refined Coal process is shovm in Figure 1. The salient aspects of the process technology as they aflFect economics are (a) delivery of the product as a solid fuel product or as a hot liquid (b) byproducts—light liquid hydrocarbon, sulfur, and electrical power (c)... 

The SRC (solvent refined coal) process of Pittsburgh Midway Coal Mining Gulf Oil) is an advanced version of the Pott-Broche extraction process. The purpose of the SRC method is to desulfurize coal to yield a solid, low-sulfur fuel. 

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