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CIOS Item 30 File No. XXXII-98

Target 30/4.12

Wintershall A. G. Lutzkendorf Mucheln

Lubricating Oil Manufacture

Specifications on gasolines and diesel oils manufactured at Lutzkendorf.

The personnel interviewed at the plant on May 11, 1945, included Dr. Schneeberger, manager of the entire plant, Dr. Neumann, in charge of lubricating oil manufacture, and Dr. Bllig, in charge of the chemical and engine testing laboratory.

The plant is of conventional design and includes installations for atmospheric crude distillation, vacuum distillation of the atmospheric residue, propane deasphalting and deresining, phenol extraction and propane dewaxing, as well as conventional acid treating and clay contacting. The crude throughput was about 60,000 bbls./month.

A mixture of Hanover and Austrian crude was processed mostly, but more recently Austrian crude only was used. Typical data on two Austrian crudes are shown in Table I. The atmspheric distillation gave the following yields for overhead, three side-streams and bottoms, respectively:

Product % by volume of crude Bbls./Month
Gasoline 10.6 6,350
Kerosine 20.0 12,000
Spindle Oil 16.7 10,000
Light Neutral dist. (about 130 SSU / 100F) 3.0 1,800
Residue 43.6 26,200
Loss 6.1 3,650
Vacuum distillation of the atmospheric residue yielded the following distillates:

vols. of phenol yielding about 41% by wt. of raffinate (calcd. on vacuum reside charged). The raffinate was propane dewaxed and clay treated with an ultimate yield of automotive bright stock of about 28% by wt. of the vacuum residue. In case that aviation bright stock was required, the raffinate from the phenol extraction was freed from phenol and again phenol extraction was freed from phenol and again phenol treated (total volume of phenol used in both stages: 500) yielding a raffinate which represented about 28% of the vacuum residue. The final yield of aviation bright stock after propane dewaxing and clay treating was approximately 18.5% by wt. of the vacuum residues. The inspection data for the two grades of bright stock are given in Table 5.

Propane deasphalting was carried out in a two-stage unit comprising 4 horizontal contractors and precipitated asphalts and resins were removed separately. Both of these products were destructively hydrogenated. The yield of deasphalted oil averaged 50% on charge.

Phenol extraction was carried out ina Kellogg unit built in 1938. It has a conventional tower type unit with performated trays and water injection was employed to improve the selectivity of the solvent.

When automotive bright stocks were processed, the normal solvent watio was 150%, the tower top temperature 90C. and the temperature gradient 10C. Aviation bright stocks on the other hand are solvent extracted twice, first under the above conditions and then re-extracted with 500% of phenol at 110 - 120C.

Dewaxing was carried out in a Dorr rotary pressure filter using discontinuous cooling. The charge stock was cooled from 86F to -40F. in one hour. The design filtration rate was 7.5 gals. per cu. ft. per hour was obtained.

The working pressure was 150-200mm. Hg. guage. The double dilution technique was not employed and there was no repulping of the wax. The oil content of the finished wax averages 20%.

Lubricating Oil Specifications:

Motor Oils

Three grades were produced having viscosities at 50C. of 8, 10 and 12F. and a max. pole height of 2.24.

Aero Oils

The following specification was adhered to:

S. G. @ 20C. 0.90
Conradson Carbon Residue max. 0.5
Viscosity @ 50C. 17E.
Viscosity @ 100C. 2.5E.
Pole Height max 2.0
Pour Point -17C. max.
(no Oxidation Test)

It was stated that when production started at this refinery a 100 ton batch of aero oil to this specification was prepared and, after engine builders had carried out acceptance tests with satisfactory results, regular production began and continued without interruption.

Gasolines     Typical Data - March 1942

Hydro Fischer-Tropsch
Sp. Gr. @ 20C. 0.749 0.700
I.B.P., C 41 40
5% 60 58
20% 79 74
50% 98 99
73% 113 127
90% 138 165
95% 150 183
F.B.P., C 154 192
Octane No. - Clear 73.5 56.5
V.P. atm. 0.66 0.32

Hydro gasoline was formerly of 180C. end point, but this was reduced to 150 - 155C. when the Hydro Gas Oil pour point specification was limited to -40C. max. Fischer Tropsch gasoline end point was later reduced for a similar reason, in this case the diesel oil cut being 160-320C. of -12C. pour point. Fischer Tropsch Gasoline of 160C. end point had a clear Octane Number of ca. 60.

No aviation gasoline was produced at Lutzkendorf.

Diesel Oils

Fischer Tropsch hydro gas oils were dispatched separately from Lutzkendorf to various WIFO blending stations, while a blend of petroleum kerosine and atmospheric spindle oil was used internally in tractors and by local transport organizations.

Typical inspection data for the first two materials during March 1942 are as follows:

Gas Oil
Gas Oil
Sp. Gr. @ 20C. 0.865 0.743
I.B.P., C 179 173
20% 200 180
50% 224 195
70% 254 205
90% 298 224
F.B.P., C. 329 256
Cloud Point, C. -25 -38
Pour Point, C. -41 -40
Filtration rate, secs. 38.4 2.6
@-28C. @-39C.
Cetane Number 35.6 68.2

Hydro diesel oil specification called for a max. pour point of -40C. and a Cetane Number of 40 - 45.

Engine Testing

In the engine testing laboratory the following engines were installed:

I.G. Prufmotor,
C.F.R. Motor Method Engine,
and Deutz Diesel Engine.

These were employed for routine Octane Number and Cetane Number determinations.

Mersol Manufacture

It was stated that a Fischer Tropsch fraction b.p. 320 to 340C. was dispatched for Mersol manufacture, and that material boiling above 340C. containing 10% was was sent to Witten for fatty acid manufacture/