US1075795A - Method and apparatus for digesting wood and other fibrous materials. - Google Patents

Description

v J. C. W. STANLEY. MBfgHoD AND APPARATUS FOR DIGBSTING Woon AND OTHER PIBRoUs MATERIALS. APPLICATION FILED JAN.6, 1911. RENEWED MAR. 28, 1913.

l,?5,?95 Patented 001;.1A1913.

Il IE '111/ lli''inlm ii A 'ing drawing, in which the mensions and built of such ran srarns raar ortica,

JOHN CHARLES WILLIAM STANLEY, 0F SANTA CRUZ, CALIFORNIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TOXSTANLEY PAPER FIBRE COMPANY, 0E SAN 'FRANCISCQ CALIFORNIA, A CORPORATION -OF ARIZONA.

METHOD AND APPARATUS FOR DIGESTING WOOD AND OTHER FIBROUS MATERIALS.

Specification of Letters Patent.

Patented Oct. 141, 1913.

Application led January, 1911, Serial No. 601,207. Renewed March 28, 1913. Serial No. 757,482.

To-aZZ whom t may concern.'

Be it `known that l, JOHN CHARLES WIL- LIAM STANLEY, a subject of the King ofl England, residing at Santa Grauz, in the county of Santa Cruz and State of California, have invented new and useful lmprovements in Methods and Apparatus for Digesting Vood and other Fibrous Materials, of which the following is a specification.

This invention relates to a digester for the cooking of wood, straw, flax and other material for the manufacture vof pulp. Y The object of this invention is to provide a digester for cooking wood, straw, flax and other fibrous material in large quantities; and to provide a digester involving details of construction designed to facilitate the feedingY of the pulp into the digester; for efficiently and eifectually digesting the pulp and to facilitate its quick removal so as to produce a substantially continuous digestion of material to be rendered into pulp.

The invention consists of the parts and the construction and combination of parts, as hereinafter more fully described and claimed, having reference to the accompany-V figure is a vertical sectional view of the improved digester.

In the prese-nt embodiment of my invention I have shown the mainl body of the digester as comprising a vertically disposed cylinder which may be of any suitable dimaterial as to be able to carry a pressure of from 80 to 125 pounds, more or less, and which is provided y at its upper end with a truncated coneshaped dome 2 and a similarly shaped bottom 3, each of which members are provided with a steam tight door as 4 and 5. rThrough the upper one the material to be digested is charged into the digester after the same has been previously filled with a suitable solution of caustic soda, sulfate of soda, or other appropriate material. rlhe solution having been iirst heated in the digester to about the boiling point by the application of steam or other heated fluid which may be distributed through a vertical manifoldor pipe 6 from which extend a plurality of branches 7 connected by any appropriate device to the body A of the dsuitable valve 16,

gester. Each of the several branches 7 is provided with a valve 8 through which the admissionof fluid' from the pipe 6 may be admitted into the digester A.

For the purpose of insuring a thorough subjection of the material to be digested to the action of the solution in the digester there is centrally mounted therein a Vertical, perforated tube 9 which is connected by transverse or radially extending perforated pipes 10 to the connections 7 with the main supply pipe 6 of which there may be one provided on each side of the digester. To

4the lower end of the perforated pipe 9 1s connected a drain pipe 12 in which is mounted a control valve 13 which may be opened at the proper period to allow the fluid contents of the digester to drain therefrom into a condensing coil or other appropriate apparatus, as indicated at 14.

There is connected to the dome 2 of the digester a. supply pipe 15 adapted to convey air under pressure directly into the upper portionof the body A, the flow of the fluid through the pipe 15 being controlled by a and from the pipe 15 is led a connection 17 joining with the main steam pipe 6 at its upper end. A valve 18- is provided in a pipe v19 which joins with the steam pipe 6 to control the admission of steam to the distributer 6.

The digester is opera-ted in the following manner: -Vlood or other material to be treated, and which has been reduced to a predetermined size, is charged throughrthe top door 4 into the digester body A in sufficient quantities to be practically submerged in the solution previously 'supplied to the digester and which has been heated tol the boiling point by the admission of steam through the lower branches 7 connected to the distributer 6, thus allowing the heated fluid to be discharged .through the perforated pipes 9 and 10 into thezvolume of the solution in the digester. During the pei riod when the heating medium is`-being appliedl to the liquor in the digester those branches 7 which are above the level of the solution or liquor are closed at their valves 8 so that all the heating medium is directed into the lower portion of the digester, and at which time the valve 16 and the branch 17 connecting the air pipe 15 with the digester 6 is closed. The woodorother material to be digested is gradually filled in in 16 opened suilicient to allow a small quantity of compressed air to enter creating a pressure in the upper part of the digester slightly in excess of the steam pressure in the same which will result in the gradual Idischarge of t-he liquor in the perforating tube from which it` will drain from the digester through the condenser coil 14. The valve 13 is then closed again and the digester filled with compressed air to a pressure of about 100 pounds so as to thoroughly collect all of the fluid in the pulp in the lower portion of the drain pipe 9 when the valve 13 may be again opened to permit the collected fluid to discharge through the coil 14,

and this collecting operation may be` repeat-ed yuntil the contents of the digester is sufiiciently cool to permit the discharge of the pulp through the bottom door 5.

In order to facilitate the discharge of the cooked pulp from the digester and after the bottom door has been opened, air under suitable pressure may be admitted into the cone top 2, thus effectively forcing downwardly the material in the digester and discharging it from the bottom openingat the door 5.

Having thus described my invention, what I claim and desire to secure by Letters Patent is- 1. The process' herein described for the digestion of brous material, said process consisting in immersing the material in a disintegrating solution; admitting a heating agent yinto the interior of the mass Vand subjecting the mass to the action of the heating agent until the mass is cooked; then draining 0H and-'condensing said solution; then admitting compressed air into thelcontainer above said mass tofthereby create a ,pressureupon the mass in excess ing agent and to squeeze out of the mass the remaining surplus solution.

2. The process herein describedvfor the digestion pf fibrous material, said process consisting 1n immersing the materialin a disintegrating solution; admitting a heating agent into the interior of the mass and sub- ]ecting the mass to the action of the heating agent unt-il the mass is cooked; then vdraining ofi' and condensing said solution; then of that of the heat-` admission of compressed air above the mass l being treated.

4. rllhe f rocess herein described for the digestion o fibrous material, said process consisting in immersing thev material in a disintegrating solution; admitting a heating agent into the interior of the mass and subjecting the mass to the action of the heating agent until the mass is cooked; then draining off and condensing said solution; and finally rapidly discharging the mass from the container by means-of air-pressure admitted on top ofsaid mass.

5. In apparatus of the character described,

a container, a perforated vertical pipe centrally placed therein and other perforated pipes branching from the first pipe,means by which-steamv may be supplied .to said pipes and into the'body of the mass being treated, and a condenser connecting with the lower part of the vertical pipe and into submerged is drained.

6. In apparatus of the character described a container, a perforated vertical pipe cen# trally placed therein and other perforated pipes branching from the first pipe, means by which steam may be supplied to said vpipes and into the body of the mass being which the solutionA in which'the mass isY treated, and a condenser connecting with the lower part of the vertical pipe and into which' the solution in which the mass'is submerged is drained, and a compressed air pipe leading into the upper part of the container.

7. In apparatus of the character described,

1 15 perforated pipes branching from the first pipe, meansl a container, a perforated vertical pipe centrally placed therein and other by which steam' may be supplied to said pipes and into the body of the mass being treated, and a condenser connecting withthe lower part of thev vertical. pipe and into which the solution in which the mass is submerged is drained, said container having a.

bottom discharge, .and a pipe-leading compressed air into the upper part of the container and adapted to exert a pressure on the mass of material to rapidly deliver the same through said bottom discharge.

8. The processI which consists in cooking the material to of digesting wood pulp be digested in a closed vessel in the presence In testimony whereof have hereunto set of a suitable disintegrating solution by permy hand in the presence of two subscribing 1o colating steam through the mass, then turn- Witnesses. ing 0E the steam and discharging the liquor from the vessel by Huid pressure, then e001- JOHN CHARLES WILLIAM STANLEY' ing the Wood puip so drained inthe vessel Witnesses:

by compressed alr, and finally discharging UDEN E. SMITH,

the cooled pulp. J. F. GALLAGHER.

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