Organic compounds -- part of the class 532-570 series – Organic compounds – Silicon containing
Patent
1985-12-09
1987-09-08
Shaver, Paul F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Silicon containing
556465, 556488, 556485, 526242, 526249, 528 25, C07F 708, C07F 718
Patent
active
046925376
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A well-known waste product of the phosphate fertilizer industry is silicon tetrafluoride. Silicon tetrafluoride in this context is a gaseous by-product of common phosphate rock and acid reactions that are used to produce soil fertilizers. The most common phosphate rock used as a source mineral for production of soil fertilizers contains, on a dry weight basis, appreciable portions of fluoroapatite Ca.sub.10 F.sub.2 (PO.sub.4).sub.6 and silica SiO.sub.2. Upon reaction with acids such as phosphoric or sulfuric acid, silicon tetrafluoride is released: .fwdarw.CaH.sub.4 (PO.sub.4).sub.2 +Ca(SO.sub.4).H.sub.2)+SiF.sub.4
The silicon tetrafluoride released is generally accompanied by hydrogen fluoride, water vapor, gaseous oxides of sulfur and nitrogen. As noted in Table 1, the major U.S. deposits of phosphate rock contain SiO.sub.2 and F and the average yield of fluorine is about 230 lbs per ton of fertilizer produced.
TABLE 1 __________________________________________________________________________
REPRESENTATIVE ANALYSES OF COMMERCIAL PHOSPHATE ROCKS
Organic
Location and Type
P.sub.2 O.sub.6
CaO
MgO
AL.sub.202
Fe.sub.202
SiO.sub.2
SO.sub.2
F Cl CO.sub.2
carbon
Na.sub.2 O
K.sub.2 O
H.sub.2
__________________________________________________________________________
O.sup.a
United States
Florida
land pebble, high grade
35.5
48.8
0.04
0.9 0.7 6.4
2.4
4.0
0.01
1.7
0.3 0.07
0.09
1.8
land pebble, furnace grade
30.5
46.0
0.4
1.5 1.9 8.7
2.6
3.7
0.01
4.0
0.5 0.1 0.1
2.0
hard rock, high grade
35.3
50.2
0.03
1.2 0.9 4.3
0.1
3.8
0.005
2.8
0.3 0.4 0.3
2.0
hard rock, waste pond
23.0
28.5
0.4
14.8
2.9 19.8
0.01
2.1
0.005
1.4
0.3 0.1 0.4
7.0
Tennessee
brown rock, high grade
34.4
49.2
0.02
1.2 2.5 5.9
0.7
3.8
0.01
2.0
0.2 0.2 0.3
1.4
brown rock, furnace grade
21.2
29.1
0.6
10.0
6.2 25.6
0.4
2.2 1.2
0.3 0.3 0.4
2.5
Western States
phosphoria rock, high grade
32.2
46.0
0.2
1.0 0.8 7.5
1.7
3.4
0.02
2.1
1.8 0.5 0.4
2.5
phosphoria rock, low grade
19.0
23.3
1.4
5.9 4.0 27.4
1.9
1.8 4.0
5.0 1.5 1.0
3.5
__________________________________________________________________________
Table 2 shows the resulting fluorine yields for various annual consumption rates.
TABLE 2 ______________________________________
FLUORINE SUPPLIES FROM
PHOSPHATE ROCK MINERALS
Average Estimated
Estimated Fertilizer Fluorine
Reserves Production Release
Location (Long Tons)
Long Tons/Yr.
Long Tons/Yr.
______________________________________
United States
14 .times. 10.sup.9
20 .times. 10.sup.6
600,000
North Africa
25 .times. 10.sup.9
13 .times. 10.sup.6
390,000
U.S.S.R. 8 .times. 10.sup.9
9 .times. 10.sup.6
270,000
Oceania 0.2 .times. 10.sup.9
2.3 .times. 10.sup.6
69,000
Brazil 0.6 .times. 10.sup.9
0.6 .times. 10.sup.6
18,000
U.A.R. 0.2 .times. 10.sup.9
0.6 .times. 10.sup.6
18,000
All Other 0.7 .times. 10.sup.9
4.5 .times. 10.sup.6
135,000
TOTALS 48.7 .times. 10.sup.9
50 .times. 10.sup.6
1.5 .times. 10.sup.6
______________________________________
Another emerging source of fluorine is in the recovery of oil from shale or dolamite reserves. Fluorine available in petrorock minerals is considered a bothersome interferace to oil recovery operations. The present invention contemplates using the hydrocarbon and fluorine constituents of petrorock minerals to form useful precursors for th production of architectural polymers. The present invention also contemplates apparatus used in the production of such architectural polymers.
The subject invention concerns recovery of the fluorine and conversion to new and useful polymers and feedstocks by novel coal or petrorock gasification process and apparatus. This inven
REFERENCES:
patent: 2539638 (1951-01-01), Schilling
patent: 2675307 (1954-01-01), Klugh
patent: 2682512 (1952-06-01), Agre
patent: 2800494 (1957-07-01), Haluska
patent: 2802851 (1957-08-01), Moore
patent: 2962357 (1960-11-01), Williams
patent: 3453079 (1969-07-01), Langer
patent: 3661519 (1972-05-01), Driscoll
"Angewandte Chemie Int. Ed.", 5, No. 12, (1966), pp. 1023-1027.
Tarbutton, "Ind. Eng. Chem.", 50, (1958), pp. 1525-1528.
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