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Automatic silver recovery from hypo
EASTMAN
136 THE
LOWER
KODAK
FATTY
ConfPANY
ACIDS
By E. R. Taylor
[J. F. I.
NOTES.
OF COCONUT
OIL.
and H. T. Clarke.
A SYSTEI\IATIC fractionation of about 130 kg. of methyl esters of coconut oil acids has been carried out. The lower fatty acids have been found in the following percentages : Per cent.
Methyl caproate .... . ....... ...... .... Methyl caprylate . . ... .. ......... Methyl caprate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Methyl Melethyl Higher
0.47 8.0 5.7
laurate . . . . . . . . . . . . . . . . . . . . . . . . 45.2 myristate ..,......,.................. 16.5 esters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.4
These results give definite information as to the quantitative distribution of the various lower acids in the original oil. The following acids have been isolated from the esters: Caproic acid, caprylic acid, capric acid, lauric acid, and myristic acid. AUTOMATIC
SILVER
RECOVERY
By K. C. D. Hickman
FROM
HYPO.”
and D. E. Hyndman.
OF THE many methods of treatment adequately described by Crabtree and Ross, those using zinc dust or sodium sulphide are the most popular. The hypo solution is permitted to accumulate until the tank is full, reagents are added, and the desilvered hypo allowed to flow to waste after settling over night. The scheme described in the present paper uses the conventional sodium sulphide method but performs the operation continWaste hypo is allowed to drop into a uously and automatically. measuring vessel fitted with an automatic syphon which flushes at During the flushing operation waste a predetermined head. developer and sodium sulphide are sucked in and the mixture From here the solution and discharged into a reaction vessel. precipitate trickle slowly doMn a funnel to a settling tank. The precipitate collects as a thick brown sludge below the funnel and is drawn off into a bucket with a perforated bottom covered with absorbent cotton. The clear, desilvered hypo flows to waste from the toll. 3 Communication published in J. .lwcr-. BCommunication published
No. 311 from the Kodak Chrul. SOL., 49, 2829, 19%‘. No. 328 from the Kodak
in Brit. .I. Phof.,
74,
683, 1927.
Research
Laboratories
and
Research
Laboratories
and
136 THE
LOWER
KODAK
FATTY
ConfPANY
ACIDS
By E. R. Taylor
[J. F. I.
NOTES.
OF COCONUT
OIL.
and H. T. Clarke.
A SYSTEI\IATIC fractionation of about 130 kg. of methyl esters of coconut oil acids has been carried out. The lower fatty acids have been found in the following percentages : Per cent.
Methyl caproate .... . ....... ...... .... Methyl caprylate . . ... .. ......... Methyl caprate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Methyl Melethyl Higher
0.47 8.0 5.7
laurate . . . . . . . . . . . . . . . . . . . . . . . . 45.2 myristate ..,......,.................. 16.5 esters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.4
These results give definite information as to the quantitative distribution of the various lower acids in the original oil. The following acids have been isolated from the esters: Caproic acid, caprylic acid, capric acid, lauric acid, and myristic acid. AUTOMATIC
SILVER
RECOVERY
By K. C. D. Hickman
FROM
HYPO.”
and D. E. Hyndman.
OF THE many methods of treatment adequately described by Crabtree and Ross, those using zinc dust or sodium sulphide are the most popular. The hypo solution is permitted to accumulate until the tank is full, reagents are added, and the desilvered hypo allowed to flow to waste after settling over night. The scheme described in the present paper uses the conventional sodium sulphide method but performs the operation continWaste hypo is allowed to drop into a uously and automatically. measuring vessel fitted with an automatic syphon which flushes at During the flushing operation waste a predetermined head. developer and sodium sulphide are sucked in and the mixture From here the solution and discharged into a reaction vessel. precipitate trickle slowly doMn a funnel to a settling tank. The precipitate collects as a thick brown sludge below the funnel and is drawn off into a bucket with a perforated bottom covered with absorbent cotton. The clear, desilvered hypo flows to waste from the toll. 3 Communication published in J. .lwcr-. BCommunication published
No. 311 from the Kodak Chrul. SOL., 49, 2829, 19%‘. No. 328 from the Kodak
in Brit. .I. Phof.,
74,
683, 1927.
Research
Laboratories
and
Research
Laboratories
and