Effects of coal rank on the chemical composition and toxicological activity of coal liquefaction materials

Wright, Cherylyn W.; Dauble, Dennis D.

doi:10.2172/5759508

Cited by 4 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result was consistent with previous studies which have established a general relationship between coal liquefaction sample water solubility and acute toxicological response of D. magna (Dauble et al 1983;Later 1985;Wright eta!. 1985;and Wright and Dauble 1986). When toxicity was based on mg/L TC in solution, similar toxic levels were noted for both the light and heavy distillate products.…”

Section: Aquatic Toxicitysupporting

confidence: 92%

“…PAH and NPAC compositions were not consistently higher or lower for the Wyodak coal-derived samples versus the lllinois No.6 coal-derived samples (see Later 1985). Previous analyses of EDS and H-Coal products derived from both bituminous and sub-bituminous coals indicated the bituminous coal-derived products had higher PAH, NPAC, and hydroxy-PAH content and lower AH content than did the sub-bituminous coal-derived products (Wright and Dauble 1986). The ITSL materials showed some of the same characteristics.…”

Section: Ritslmentioning

confidence: 86%

“…These results were not consistent with previously reported results from the testing of H-Coal products derived from different ranks of coal. Lower levels of mutagenic activity were noted to be associated with the products derived from sub-bituminous coal compared to the products derived from a bituminous coal by Wright and Dauble (1986). This inconsistency may be related to the overall low levels of mutagenic activity expressed by ITSL products compared to the H-Coal products.…”

Section: Toxicological Iesiing Microbial Muta~enjcitymentioning

confidence: 92%

“…6 coal (see Later 1985). Coal liquefaction products from the same process derived from sub-bituminous coals have been noted to be of lower molecular weight ranges than products derived from bituminous coals by Wright and Dauble (1986). • Summary Chemical analyses of the RITSL and CCRITSL product and internal process stream samples indicated there were little differences between the products based on a close-coupled to non-close-coupled pilot plant configuration.…”

Section: Low-voltaee Probe-inlet Mass Spectrometzymentioning

confidence: 99%

See 3 more Smart Citations

Reconfigured, close-coupled reconfigured, and Wyodak coal integrated two-stage coal liquefaction process materials from the Wilsonville facility: Chemical and toxicological evaluation

Wright¹

1987

Self Cite

View full text Add to dashboard Cite

The chemical composition and toxicological activity of the coal liquefaction products and internal process stream materials from the reconfigured, integrated two-stage liquefaction (RITSL) process, the close-coupled, reconfigured, integrated two-stage liquefaction (CCRITSL) process, and the integrated two-stage liquefaction (ITSL) process using a sub-bituminous Wyodak coal as a feedstock have been evaluated as part of an effort to define the potential health effects of advanced coal liquefaction technology. All coal-derived liquids were produced at the Advanced Coal Liquefaction Research and Development Facility in Wilsonville, AL. The RITSL proce~s configuration consisted of a first-stage thermal liquefaction unit followed by a secondstage hydrotreater unit with critical solvent deashing after the second-stage. The CCRITSL process was operated the same way as the RITSL process, except that no cooling down or heating up of products occurred prior to the second-stage in the close-coupled mode. Critical solvent deashing was prior to the second-stage hydrotreater reactor in the ITSL process. Chemical analyses were performed using the following methods: proton nuclear magnetic resonance spectroscopy, adsorption column chromatography, high resolution gas chromatography, gas chromatography/mass spectrometry, and low-voltage probe-inlet mass spectrometry. Toxicological activity was determined using the standard histidine reversion microbial mutagenicity assay, an initiation/promotion mouse skin tumorigenicity assay, and a static bioassay with the freshwater invertebrate Daphnia magna. Chemical analyses and mutagenicity testing of the RITSL and CCRITSL product and internal process stream coal liquids indicated there were generally no significant differences between the samples from the close-coupled versus the non-close-coupled configuration. There was, however, slight evidence of retrograde reactions occurring in the RITSL process as compared to the CCRITSL process probably due to the cooling down step in the former versus the latter process. The first-stage products of both processes had compositions generally higher in nitrogen-containing polycyclic aromatic compounds (NPAC) and hydroxy-substituted polycyclic aromatic hydrocarbons (hydroxy-PAR) and had compositions generally lower in aliphatic hydrocarbons (AH) and hydroaromatic hydrocarbons than did the second~stage products. These results corresponded to slightly increased mutagenic responses in the first-stage products versus the second-stage products. Increased tumorigenic response was also noted for the hydrotreater feed (a first-stage internal process stream coal liquid) versus the second-stage heavy distillate product. The coal liquids of higher boiling ranges (particularly the bottoms products) had increased NP AC and hydroxy-P AH contents with correspondingly decreased AH contents as compared to the lower boiling range materials from the same process. Vll The RITSL, CCRITSL, and ITSL (Wyodak) coal liquids all had the same major individual components present i...

show abstract

Section: Aquatic Toxicitysupporting

confidence: 92%

Section: Ritslmentioning

confidence: 86%

Section: Toxicological Iesiing Microbial Muta~enjcitymentioning

confidence: 92%

Section: Low-voltaee Probe-inlet Mass Spectrometzymentioning

confidence: 99%

See 2 more Smart Citations

Reconfigured, close-coupled reconfigured, and Wyodak coal integrated two-stage coal liquefaction process materials from the Wilsonville facility: Chemical and toxicological evaluation

Wright¹

1987

Self Cite

View full text Add to dashboard Cite

show abstract

“…The solvent refined coal (SRC)-I and -II processes, which were developed successively, show the higher yield of light products that are better suited as substitutes for petroleum-derived fuels by the two-stage catalytic process . The effect of coal rank on the product distribution was studied for the Exxon donor solvent (EDS) process recycle solvent and for H-coal heavy fuel oil (Tables and ) . Aliphatic hydrocarbons (AlHs) were the major products in the EDS recycle solvents of three coals: 61% for subbituminous Wyodak coal and Texas lignite, and 46% for bituminous Illinois No.…”

Section: Chemical Composition Of the Coal Liquefaction Productsmentioning

confidence: 99%