US39828A - Improved process of recovering wool from mixed fabrics - Google Patents

Description

' ation of many troubles.

, UNITED STATES PATENT OEEIcE.

JOHN GEo. PEEZEL, oE'nEw YORK, N. Y.

IMPROVED PROCESS OF RECOVERIN G WOOL FROM MIXED FABRI CS.

Specification forming part of Letters Patent No. 39,828; dated September 8, 1863; antcdatcd April 3, 1863.

by means of chloride of zinc or analogous chlorides, either alone or with the aid of diluted sulphuric acid, whereby the wool re-' mains, without being injured, as a new and use; ful article of manufacture.

I am aware that sulphuric acid has been used to render the mentioned effect-an application which is in accordance with the wellknown chemical fact that sulphuric acid has the property of dissolving or decomposing'cotton, forming dextrine and sugar, 85c. but as this acid is of a Very powerful chemical character, great care must be observed in using the same for the purpose mentioned. It is a matter of course that the wool cannot resist a continued action of sulphuric acid, and particularly not a raising of temperature by the presence of this powerful agent. Nevertheless this process has till yet been observed, but at the same time under a continu- The nature of the process and the destroying agent used explains fully why difficulties are experienced which hardly are to be avoided.

To overcome these" difficulties is the object of my invention-namely, in the use of. chloride of zinc or chloride of calcium or other analogous chlorides. These substances possess the same property as sulphuric acid. They destroy cotton by raising the temperature to about 100 Centigrade without injurhe wool under the same circumstances. The goods may remain in this liquid substance, hereinafter described, for twenty-four hours without destroying the wool, &c. It is possible, and under some circumstances practicable, to bring the goods in concentrated boiling solution of the before-named substances for fifteen minutes, 820., and the res'ult will be as is required. It is otherwise very easily understood why these substances are more convenient for the workmen than sulphuric acid,

the fatty matter, in a manner as may be learned from anygood book of chemical technology, (see Knapps Hand-Book of Technology,) as may be convenient to work with, and let it remain in this state for a while-say half an hour.- The goods are then taken out and wrung in order to removethe surplus liquid. This may be done in a shorter time and by saving of labor by means of a centrifugal macase when the cotton texture becomes ruined by feeble rubbing, whereby the cotton is removed in form of dust. A little practice will enable everybody to judge about the time. After this the goods must be well washed, dried, and brought in a rubbing (Walf) machine, where the destroyed cotton is separated and removed from the wool, 8tc. They are at last brought through different machines as they are used in woolen manufacture, in order to obtain a nice article of commerce.

In some respects-as in order to shorten the destroying process-it may be practicable to use chloride of zinc with the aid of diluted sulphuric acid. In this case it is only necessary to bring the goods, after they have passed the zinc solution, in a mixture of water and sulphuric. acid of about 15 Baum for about fifteen minutes, 8w.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The solution of chloride of zinc or analogous chlorides, either alone or with the aid of diluted sulphuric acid, in a manner as described, and for the purpose set forth.

. JOHN GEORGE PEEZEL.

Witnesses:

CHAS. F. SoNNEEoRN, FR. RUSCHHAUPT.