Exxon Catalytic Coal-Gasification Process development program. Quarterly technical progress report, July-September 1979

Technical Report · Sat Dec 01 04:00:00 EST 1979

OSTI ID:6165009

Euker, Jr, C A

Catalyst recovery studies indicate that Ca(OH)/sub 2/ digestion in dilute KOH (0.1 M) solutions may be as effective as in concentrated solutions (1.0 M). The lack of adequate mixing of char, lime, and process solution prior to digestion was found to increase the amount of inactive potassium silicates in the recovered catalyst solution. This result may be due to agglomeration of lime prior to digestion, preventing the full utilization of the calcium in the lime for the digestion reaction. Experiments have shown that soluble potassium can be extracted from flocculant treated chars. Furthermore, flocculant pretreatment was found to increase sedimentation and filtration rates by a factor of 2 to 5 depending on process conditions of temperature, pH, and weight percent solids in the slurry. A combination of a cationic and an anionic flocculant gave even better filtration and sedimentation rates and liquid clarity than the use of either one of them alone. Guidelines and recommendations for the safe operation of the PD gasifier were formulated and carried out. The gasification section of the PD was operated at 500 psia and 1200/sup 0/F using nitrogen and steam as the fluidizing gases for short periods of up to 15 hours while the feed and withdrawal systems were debugged. Aferwards, a sustained operation of 165 hours at conditions of 1200 to 1250/sup 0/F and 500 psia was completed. Feed rates were 150 lbs/h steam, 3500 SCFH total nitrogen, and 90 lbs/h catalyzed Illinois coal. Material balances were in the 95 to 98% range. A study to optimize the Methane Recovery Section of the CCG process has been initiated. Work continued on catalyst recovery system screening studies to evaluate the economic impacts of alternative processing approaches and solid-liquid separation techniques.

• Research Organization: Exxon Research and Engineering Co., Baytown, TX (USA)
• DOE Contract Number: AC01-78ET13005
• OSTI ID: 6165009
• Report Number(s): DOE/ET/13005-T11; FE-2777-13; ON: DE82002982
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
BENCH-SCALE EXPERIMENTS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CATALYSTS
COAL GASIFICATION
DATA
EXPERIMENTAL DATA
EXXON GASIFICATION PROCESS
FILTRATION
FUNCTIONAL MODELS
GASIFICATION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
METHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
PROCESS DEVELOPMENT UNITS
RECOVERY
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES