De-ashing of coal liquids with ceramic membrane microfiltration and diafiltration. Quarterly technical progress report, January 1--March 31, 1993
Removal of mineral matter from liquid hydrocarbons derived from the direct liquefaction of coal is required for product acceptability. This program is directed towards development of an improved process for de-ashing and recovery of coal-derived residual oil: the use of ceramic membranes for high-temperature microfiltration and disfiltration. Using laboratory-scale ceramic membrane modules, samples of a coal-derived residual oil containing ash will be processed by crossflow microfiltration, followed by solvent addition and refiltration (disfiltration). Recovery of de-ashed residual oil will be demonstrated. Data from this program will be used to develop a preliminary engineering design and cost estimate for a demonstration pilot plant incorporating full-scale membrane modules. In addition, estimates for production system capital and operating costs will be developed to assess process economic feasibility.The five program tasks include (1) ceramic membrane fabrication, (2) membrane test system assembly, (3) testing of the ceramic membranes, (4) design of a demonstration system using full scale membrane modules, and (5) development of estimates for microfiltration capital and operating costs and assessment of process economic feasibility. A subcontract is being sought with Exxon Research and Engineering (ER+E) to conduct microfiltration and diafiltration with CeraMem`s modules using a coal liquid made at Exxon`s liquefaction facility in Baton Rouge LA. To help plan the test program at Exxon and to anticipate how the CeraMem module many perform, CeraMem made mass balance calculations of a prototypical diafiltration process. These calculations predict that 80% to 90% of the residual oil can be recovered in an ash-free form even with modest ratios (2 to 4) of diafiltration solvent volume to residual oil volume. The calculations also say that no more than three diafiltration stages will likely be economical.
- Research Organization:
- CeraMem Corporation, Waltham, MA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-92PC92149
- OSTI ID:
- 10167920
- Report Number(s):
- DOE/PC/92149-T2; ON: DE93017791
- Resource Relation:
- Other Information: PBD: 1993
- Country of Publication:
- United States
- Language:
- English
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