Coal liquefaction process

Patent · 01 January 1978

OSTI ID:863215

Maa, Peter S ^[1]

---

1. Baytown, TX

A process for liquefying a particulate coal feed to produce useful petroleum-like liquid products which comprises contacting; in a series of two or more coal liquefaction zones, or stages, graded with respect to temperature, an admixture of a polar compound; or compounds, a hydrogen donor solvent and particulate coal, the total effluent being passed in each instance from a low temperature zone, or stage to the next succeeding higher temperature zone, or stage, of the series. The temperature within the initial zone, or stage, of the series is maintained about 70.degree. F and 750.degree. F and the temperature within the final zone, or stage, is maintained between about 750.degree. F and 950.degree. F. The residence time within the first zone, or stage, ranges, generally, from about 20 to about 150 minutes and residence time within each of the remaining zones, or stages, of the series ranges, generally, from about 10 minutes to about 70 minutes. Further steps of the process include: separating the product from the liquefaction zone into fractions inclusive of a liquid solvent fraction; hydrotreating said liquid solvent fraction in a hydrogenation zone; and recycling the hydrogenated liquid solvent mixture to said coal liquefaction zones.

• Assignee: Exxon Research & Engineering Co. (Linden, NJ)
• Patent Number(s): US 4123347
• OSTI ID: 863215
• Country of Publication: United States
• Language: English

Related Subjects

/208/
10
150
20
70
750
950
admixture
coal
coal feed
coal liquefaction
compound
compounds
comprises
comprises contacting
contacting
degree
donor
donor solvent
effluent
feed
final
final zone
fraction
fractions
graded
hydrogen
hydrogen donor
hydrogenated
hydrogenation
hydrogenation zone
hydrotreating
inclusive
initial
instance
liquefaction
liquefaction process
liquefaction zone
liquefying
liquid
liquid product
liquid products
liquid solvent
maintained
minutes
mixture
particulate
particulate coal
passed
petroleum-like
polar
process
produce
produce useful
product
products
ranges
recycling
remaining
residence
residence time
respect
separating
series
solvent
solvent mixture
stage
stages
steps
succeeding
temperature
temperature zone
time
total
useful
zone
zones