US106143A

US106143A - Improvement in the manufacture op paper pulp

Info

Publication number: US106143A
Authority: US
Publication date: 1870-08-09
Anticipated expiration: 1887-08-09

Description

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ASAHEL K. EATON, OF PIERMONTQNEW YORK.

Letters Patent No. 106,143,1lated August 9, 1870.

IMPROVEMENT IN THE ANUFACTURE or' PAPER PULP.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it kuon'n that I, ASAHEL K. EATON, of Piermont, in the county of Rockland and State of New York, have invented certain new and useful Improvementsin the Art of Manufacturing Paper Pulp from,

Straw, \Vood, and other Vegetable Fiber; and 1 do hereby declare thefollowing to be such a full, clear, and exact description thereof as will enable any one skilled in the art to which myinvention appertaius to \vorkor practice the same. i

In the manufacture of paper pulp after the process described in the patent heretofore granted to nie, and dated the 22d of March, 1864, it is necessary to reproduce the caustic, soda, or potash toinsure the desired profit as the oonnnercial result of the process, but the expense of apparatus and labor necessary to thereprmluction of the. soda or potash makes it desh-able to substitutein its place a solvent, the recovery whereof is urmecessary to insure at least as large a profit as an be obtained in the use of soda or potash as a solvent, even thoughthe whole of it contained in the refuse water he recovered, which is scarcely possiblc in the practical marmthctureof the pulp.

Now, 1 have discovered that the incrustiug matter of the, cellulose of the wood, straw, orother vegetable material suitable for paper pulp, can bedissolved readily, and with great economy, by the use of oxysulphide of calcium, a substaucept' such little cost that the refuse liquor can be thrown away without material loss to the maimfitoturcr.

In the practiceof this improvement, I first put the straw, wood,'.or other tibrous'sub stance out of which the pulp is to be made, in the water-tank, and raise it to the boiling point. I then take, to a ton of straw or wood, from two to five hundred pounds of lime, which ltirst makeinto a milk of lime. To this I add about twenty pounds of sulphur". I then throw the mixture into the tank of boiling water containing the straw or wood, leaving the-combination of the sulphur and lime to take place in the tank, thus saving the preparation of the sulphide beforehand, and continue the treatment as though a caustic soda were'uscd.

The result is apulp in all respects equal, if not superior, to that made by the use of caustic soda or pot-ash, and in evena morefiworable condition for bleachin The proportions given above may, of course, be somewhat varied, as will appear by those given, but, the lime should always be in chen'iical excess of the sulphur, that is, more than is necessary for the sul-. phur to combine with to form the sulphide of-calcinm, the ordinary quantity of water being used in all cases.

The rationale of the process seems to be as follows: The sulphide formed in the solution first dissolves the resinous and incrusting matter of the straw or wood, which it immediately gives up to the excess of lime, the sulphide being thus left in itsoriginal condition to act again and again.

In referring to the patent heretofore granted to me, I do not intend to limitthis improvement to the method described there, as this .sulphide can be substituted anthe caustic alkali in-all processes where the same is usedas :a solvent with beneficial and economical results; tlucos't oftreating tiber with alkali after the old process being from two to three centsper pound of pulp produced'tbr the alkaline treatment alone, while by the use of the sulphide the cost will be very much reduced, even by the old process; and, in connection with the process described in the patent above referred to, the cost is reduced to one-half cent or less per pound of pulp for this part of the process, Wbiclnitselhis a great advantage eoasideredmerely in the light of commerce.

Having now described the nature and extent of my improvementin the art of manufacturing paper pulp,

Iclailn as new herein, auddesire to secure by Lettors Patentv The use of oxysulphide otcalcinm as a solvent in the manufacture of paper pulp from straw, wood, or other vegetable substance suitable for that purpose.

A. K. EATON. Witnesses:

Anos Bnoam'ax, PETER D. Knxsv.