Karrick Process Dossier (Third Capture): Low-Temperature Carbonization at the source archive

What this source is

This is a source dossier on low-temperature carbonization (LTC) of coal, organized around the Karrick process and its namesake, Lewis Cass Karrick. The source identity (karrick3/karrick3.htm, folder context "dossier 10 — Low-temperature carbonization") places it as the third Karrick page in the source archive collection.

Two earlier Karrick captures are already represented in this wiki:

• Karrick Process and Low-Temperature Carbonization: A source Dossier (Provisional Record) — the first Karrick dossier, ingested as a provisional record.
• Karrick Process Dossier (Second Ingestion): Low-Temperature Carbonization at the source archive — the second Karrick dossier.

This page is therefore a third capture of overlapping material. Its value to the wiki is not a new narrative — the general Karrick story is already covered twice — but the possibility that it carries additional quantitative tables or retort diagrams not present in the earlier captures. The image filenames referenced by the dossier (tabl9.jpg, tabl1317.jpg, kltccogen.jpg, nturifleco.jpg, nturetortrifleco.jpg, kltc-rtrt.jpg, iec151.jpg) point in that direction: numbered tables and apparatus diagrams.

Relationship to the prior captures

The three Karrick pages should be read as variants of one dossier, not as three independent sources. Nothing in the available metadata indicates that this capture introduces a new inventor, a new patent, or a new organization beyond what the earlier two already established. The relevant entities and concepts — Lewis Cass Karrick, US Bureau of Mines, karrick-process, Low-Temperature Carbonization (LTC), Destructive Distillation, Coal Liquefaction, Semi-Coke, Coal Tar — all already have pages.

The practical consequence is that this article is deliberately short. Inflating it with a restatement of the Karrick narrative would duplicate material already published under the two earlier source pages without adding evidence.

Claimed mechanism and products

The dossier's subject matter is the standard LTC account:

• Coal is heated to a temperature range below that of normal coking — conventionally described as roughly 450–700 °C — driving off volatile matter.
• The thermal decomposition proceeds in the absence of oxygen, i.e. as Destructive Distillation.
• The process yields three product streams: a solid residue (Semi-Coke), a condensable liquid fraction (Coal Tar), and a combustible gas.
• The Karrick variant is claimed to produce a liquid fuel fraction usable as a petroleum substitute, alongside the semi-coke and gas co-products — the claim category covered by Coal Liquefaction.

These are the dossier's assertions. They are not independently verified by this wiki, and the source is an archive compilation rather than a laboratory report.

Apparatus and diagrams

The image filenames indicate that the dossier illustrates retort hardware rather than only describing it:

• nturifleco.jpg and nturetortrifleco.jpg — depict the NTU (Nevada-Texas-Utah) retorts at the US Bureau of Mines Oil-Shale Demonstration Plant, Rifle, Colorado, per the source caption.
• kltc-rtrt.jpg — appears to depict a retort associated with the KLTC abbreviation.
• kltccogen.jpg — appears to be a co-generation or combined-output diagram tied to the same abbreviation.
• iec151.jpg — an additional figure, purpose not determinable from the filename alone.

The abbreviation KLTCC appears in two of these filenames. The available metadata does not define it, and this wiki does not guess at its expansion. If the dossier text defines KLTCC or the NTU retort with enough substance, a dedicated page for the retort design would be justified; on the present evidence it is not.

Tables and quantitative data

The filenames tabl9.jpg and tabl1317.jpg correspond to numbered tables in the source: Table IX is captioned "Bureau of Mines Crude Shale Oil Analysis of Oil Produced by NTU Retort at Rifle CO" and Table XIII covers "Effect of Boiling Range on Hydrocarbon Group Distribution of Distillates from NTU Shale Oil." Table III is an atmospheric distillation operation on NTU shale oil. These are Bureau of Mines analyses of NTU shale oil, not Karrick coal-LTC yields, and the source does not reproduce their numeric contents in text.

Evidence status and limitations

• Provenance is partly identified. The dossier's tables are captioned as Bureau of Mines analyses of NTU shale oil from the Rifle, CO demonstration plant, and the retort photographs are credited to Industrial and Engineering Chemistry (January 1951). The promotional framing ("Surprise! We Can Make Oil From Coal Cheaper Than The Oil Wells Can Pump It Out") comes from Newsreal #2, June 1977, by Harlan Trott.
• No independent verification. Nothing in this capture constitutes a replication, an energy balance, or a third-party audit of the claimed yields.
• Third-capture duplication. The substantive overlap with the two prior Karrick source pages is high. Readers seeking the full narrative should start with the earlier captures.
• Patent and archive material is not proof. Where the dossier reproduces patent text or historical report text, the caution in Patent as Evidence applies: a filing or a publication records a claim, not a demonstrated result.

Open questions

1. Is this third capture materially different from the prior two, or a variant of the same page? The low but nonzero capture-problem probability attached to the ingest suggests this is worth confirming.
2. Should the three Karrick source pages be consolidated into one canonical article with a note recording multiple captures, to avoid wiki bloat?
3. Do tabl9.jpg and tabl1317.jpg contain data absent from the earlier captures? If so, they should be transcribed and Karrick Claims vs. Evidence: The Dossier's Assertions and the Absence of Test Data revisited.

Related work

• karrick-process — the named process this dossier documents.
• Low-Temperature Carbonization (LTC) — the general technique.
• Lewis Cass Karrick — the inventor and Bureau of Mines engineer.
• US Bureau of Mines — the institutional context.
• Karrick Claims vs. Evidence: The Dossier's Assertions and the Absence of Test Data — the existing claims-versus-evidence assessment, unchanged by this capture on present evidence.
• the source archive — the archive that published the dossier.