US1717800A - Robert a - Google Patents
Robert a Download PDFInfo
- Publication number
- US1717800A US1717800A US1717800DA US1717800A US 1717800 A US1717800 A US 1717800A US 1717800D A US1717800D A US 1717800DA US 1717800 A US1717800 A US 1717800A
- Authority
- US
- United States
- Prior art keywords
- cane
- sulfate
- making
- liquor
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 description 59
- 241000209134 Arundinaria Species 0.000 description 25
- 238000000034 method Methods 0.000 description 15
- 229910052936 alkali metal sulfate Inorganic materials 0.000 description 11
- 239000000835 fiber Substances 0.000 description 11
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 10
- 229910000368 zinc sulfate Inorganic materials 0.000 description 10
- 229960001763 zinc sulfate Drugs 0.000 description 10
- 238000010411 cooking Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000001079 digestive effect Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 244000007853 Sarothamnus scoparius Species 0.000 description 4
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 4
- 229910052939 potassium sulfate Inorganic materials 0.000 description 4
- 235000011151 potassium sulphates Nutrition 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 3
- 244000099850 Arundinaria gigantea Species 0.000 description 2
- 235000007085 Arundinaria gigantea Nutrition 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 244000082204 Phyllostachys viridis Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 235000010446 mineral oil Nutrition 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 241000044443 Lasiacis Species 0.000 description 1
- 244000299461 Theobroma cacao Species 0.000 description 1
- 235000009470 Theobroma cacao Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- -1 alkali metal salt Chemical class 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010685 fatty oil Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 229940046892 lead acetate Drugs 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000002641 tar oil Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/006—Pulping cellulose-containing materials with compounds not otherwise provided for
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01C—CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES
- D01C1/00—Treatment of vegetable material
- D01C1/02—Treatment of vegetable material by chemical methods to obtain bast fibres
Definitions
- the present invention relates to the treatment of cane material, under which term is included various kinds of cane brake growth, such as Machrospermw arumda'ria, Mac/trosperma team, and various kinds of bamboo.
- the invention embraces converting cane material of this character into various fibrous materials by treatment with a digestive solution, and subsequently working up the material in any suitable manner, de-
- the cane material may be treated either in a green or dry condition, and may be treated either in short or long lengths depending upon the particular prodnot which is desired, and the size and length of the material under treatment.
- the cane which may be cut up into suitable lengths and may be tied up into bundles if desired, is placed into a solution preferably consisting of 1 part of zinc sulfate, 1 part of potassium sulfate, 2 parts of sodium sulfate.
- the said mixture being employed in amount equal to about 1 to 2 ounces of the mixture to each gallon of water.
- This forms a digestive solution of about I to 1 70 strength, which is very much less concentrated than the usual digestive solutions heretofore generally used by others in making pulp.
- the large cane cut into suitable lengths is placed into a digester (preferably in the form of bundles), the digester being packed as full as possible with the bundles of material.
- the digester is then filled with the liquor above referred to, which may be cold or warm or even hot, and the cover is then placed on the digester in an air tight manner.
- the material is then cooked by heating the liquor in any suitable manner, for example, by blowing in steam. The length of time and temperature of the cooking operation, will determine the degree to which the cane material will be modified by the cooking operation.
- the liquor will be heated up to a pressure of, for example, 75 pounds, this pressure being maintained for 15 or 20 minutes, after which the liquid may be allowed to cool sufiiciently to bring the pressure back to about atmospheric, after which the cooked material may be removed from the hot liquor.
- a pressure of, for example, 75 pounds this pressure being maintained for 15 or 20 minutes, after which the liquid may be allowed to cool sufiiciently to bring the pressure back to about atmospheric, after which the cooked material may be removed from the hot liquor.
- the cane material may be heated in the solution up to a pressure of 140 pounds,'which pressure may be maintained for 1% to 3 hours. It is to be understood that these pressures and temperature are given for the purpose of illustration and not as limiting the invention thereto.
- the digester with the solution and cooked material can then be allowed to cool off somewhat, say until the pressure has dropped to about atmospheric and the temperature has dropped to somewhat below the boiling point, after which the liquor can be drawn off from the digester or the bundles of material can be taken out of the digester leaving the liquor therein.
- the bundles of cooked material may be soaked in water at ordinary temperature or hot water for hour or so to remove any adhering chemicals.
- pulp from the cooked ma terial it can first be run through rollers lengthwise of the grain, which willv cause the same to be broken-up into fiber bundles, which can then be run through a pulper and then through a Jordan engine.
- the material may then be made into sheets in the usual manner.
- an ordinary beater engine can be used, if desired, this ordinarily not being necessary.
- a paper is produced in this manner which is of a brownish color and is very strong, being stronger than many of the varieties of kraft paper.
- an oleaginous material such as an emulsion of oil (e. g.
- mineral oil and soap, as a lubricant.
- This serves as a conditioning material, and the oil employed may be mineral oil, fatty oil, or tar oil.
- the material is then run through rolls, which may be of hard material such as iron, or wood, or of soft yielding material such as rubber. If the rolls are made of hard ma terial they should not be pressed together too hard, since the strength of the fiber is liable to be injured if too much pressure is used. If desired a device similar to an ordinary laundry clothes-wringcr may be used in this operation. In case wooden or iron rolls are used it may be advisable to combine the oiling operation with the pressing operation, by allowing the bottom roll to dip into an oily material or an emulsion of an oily material.
- the rolled material can then run through a picker and a carding device and then may be used as a substitute for coir or cocoa fiber for making mats and matting or for making the coarse fabrics above referred to. Any of the waste from this operation may, if desired, be run through a pulper and can thereafter be used for making paper.
- the cooked material may be washed and treated with an oily material as above referred to after which it can be passed through rolls in the manner above referred to.
- the material can then be brushed or carded for removing tow as a by-product, which tow can be worked up into fabrics, rope or pulp as above described.
- the cooked material preferably after oiling, can be passed lengthwise through cutters'spaced to produce the desired thiclmess.
- the fiber either in the form of pulp, textile fiber or broom fiber or finished'products containing these, may, if desired, be dyed by treatment with cotton dyes and alum, or other mordant.
- Fiber made for brooms and brushes and Another suitable mixture for making the material water-resistant is one consisting of lead acetate solution and a solution of cop peras each containing gum or dextrin the two solutions being mixed together.
- this material may be put into the digester without being cut into lengths, simply being bundled into largebundles to completely fill the digester or being made into small bundles which are then packed into the digester. These bundles are then cooked and on being runv through rollers, the material breaks up at the joints or nodes, leaving the fiber material for further treatment.
- the'cane may be cut into sections, cutting out the joints, or nodes, then making bundles of substantially uniform lengths of the cane material, preferably splitting up the same into several pieces.
- the nodes or joints which are thereby cut out can be cooked separately for the making of pulp so that it is not necessary to waste any of this material.
- the digestive liquor above referred to is capable of being modified to some extent.
- the proportions of the materials as given above are those which have been found to give very satisfactory results.
- the proportions of the materials as given above are those which have been found to give very satisfactory results.
- the particular preferred cooking liquor above referred to is especially advantageous in that it can be used over several times in the cooking of successive batches of the cane and it not necessary tov throw away the liquor and to make up fresh liquor after each cooking operation. T have repeatedly used the same liquor in more than a dozen successive cooks with satisfactory results. The cooked material may take out a small quantity.
- the water in which the cooked material is soaked can be used in making up fresh quantities of liquor or can be used for making up any loss of liquor from the above solution.
- Further quantities of the sulfates referred to can be added from time to time. to prevent the liquid from becoming unduly weakened by absorption.
- Theliquid pressed out from the cooked material during the pressing operation above. referred to likewise can be used for making up additional. cooking liquid.
- a proces of treating cane material of the character set forth which comprises digesting the same in a solutiorrcontaining an alkali metal sulfate and Zinc sulfate.
- a process of treating cane material of the character set forth which comprises digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, and. carrying the pressure up to at least 7 pounds, for not less than minutes.
- a process of treating cane material of the character set forth which comprises. digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, and carrying the pressure up to. at least 100, pounds for not less than minutes.
- a process of treating cane material of the character set forth which comprises digesting the same in a solution containing an fit alkali metal sulfate and zinc sulfate, and carrying the pressure up to about 140 pounds for about 90 to 180 minutes.
- a process of treating cane material of the character set forth which comprises digesting the same in a solution containing sodium sulfate, potassium sulfate and zinc sulfate.
- a process of treating cane material of the character set forth which colnprises digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, and thereafter running the cooked -material through pressure rolls.
- a process of treating cane material of the character set forth which comprises digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, running the cooled material through pressure rolls and applying an oleaginous material thereto, the last-mentioned two steps being in any desired order.
- a process of treating cane material of the character set forth which comprises digesting the same in a solution containing a plurality of alkali metal sulfate solutions.
- a process of treating cane material which comprises digesting the same in a sulfate solution containing a alkali metal sulfate under pressure above atmospheric, and thereafter crushing said material.
- a process which comprises digesting cane material with a solution containin a plurality of sulfates including zinc sul ate and thereafter reducing the size of the pieces by mechanical treatment.
- a process which comprises digesting cane material in a solution containing zinc sulfate and an alkali metal sulfate, such solution containing substantially less than 5% of dissolved salts.
- a process which comprises digesting cane material in a solution containing zinc sulfate and an alkali metal sulfate, such solution containing about 1 to 2% of said salts, and being free from other strong added chemicals.
- a process of treating cane material which comprises digesting the same in a solution containing an alkali metal salt and a soluble salt of another metal, such solution being of about 1% to 2% strength, and repeatedly using the same digesting solution with a plurality of batches of the said cane material.
- a process of treating cellulosic and capitaous material which comprises digesting the same in a sulfate solution containing an alkali metal sulfate and a soluble earth metal sulfate, together amounting to not over 2%, such salts being the principal dissolved active constituents of such solution, such digestion being conducted under superatmospheric pressure, and repeatedly using the same digestive solution with a plurality of batches of the said cellulosic and ligneous material.
Description
Patented June 18, 1929.
UNITED STATES ROBERT A. MARE, F NORFOLK, VIRGINIA.
PROCESS OF TREATING CANE MATERIAL.
No Drawing.
The present invention relates to the treatment of cane material, under which term is included various kinds of cane brake growth, such as Machrospermw arumda'ria, Mac/trosperma team, and various kinds of bamboo.
The invention embraces converting cane material of this character into various fibrous materials by treatment with a digestive solution, and subsequently working up the material in any suitable manner, de-
pending upon the final product which it is desired to obtain. The cane material may be treated either in a green or dry condition, and may be treated either in short or long lengths depending upon the particular prodnot which is desired, and the size and length of the material under treatment.
The cane, which may be cut up into suitable lengths and may be tied up into bundles if desired, is placed into a solution preferably consisting of 1 part of zinc sulfate, 1 part of potassium sulfate, 2 parts of sodium sulfate. The said mixture being employed in amount equal to about 1 to 2 ounces of the mixture to each gallon of water. This forms a digestive solution of about I to 1 70 strength, which is very much less concentrated than the usual digestive solutions heretofore generally used by others in making pulp. In the preferred form of carrying out the process, the large cane cut into suitable lengths is placed into a digester (preferably in the form of bundles), the digester being packed as full as possible with the bundles of material. The digester is then filled with the liquor above referred to, which may be cold or warm or even hot, and the cover is then placed on the digester in an air tight manner. The material is then cooked by heating the liquor in any suitable manner, for example, by blowing in steam. The length of time and temperature of the cooking operation, will determine the degree to which the cane material will be modified by the cooking operation.
For making fiber materials for stiff brushes and the like, the liquor will be heated up to a pressure of, for example, 75 pounds, this pressure being maintained for 15 or 20 minutes, after which the liquid may be allowed to cool sufiiciently to bring the pressure back to about atmospheric, after which the cooked material may be removed from the hot liquor. For making materials for spinning fibers, burlap, gunny cloth,
Application filed October 17, 1922. Serial No. 595,215.
rope, twine and cordage, it is advisable to hold a pressure of about 100 pounds for 30 minutes or so. For making finer cloth, a pressure of 100 pounds, maintained for 30 to 40 minutes generally gives good results.
For making pulp for use in the manufacture of paper, plastic materials, such as artificial lumber or the like, the cane material may be heated in the solution up to a pressure of 140 pounds,'which pressure may be maintained for 1% to 3 hours. It is to be understood that these pressures and temperature are given for the purpose of illustration and not as limiting the invention thereto. In all of the cases above mentioned, the digester with the solution and cooked material can then be allowed to cool off somewhat, say until the pressure has dropped to about atmospheric and the temperature has dropped to somewhat below the boiling point, after which the liquor can be drawn off from the digester or the bundles of material can be taken out of the digester leaving the liquor therein. The bundles of cooked material may be soaked in water at ordinary temperature or hot water for hour or so to remove any adhering chemicals. For making pulp from the cooked ma terial, it can first be run through rollers lengthwise of the grain, which willv cause the same to be broken-up into fiber bundles, which can then be run through a pulper and then through a Jordan engine. The material may then be made into sheets in the usual manner. In place of using the Jordan, an ordinary beater engine can be used, if desired, this ordinarily not being necessary. A paper is produced in this manner which is of a brownish color and is very strong, being stronger than many of the varieties of kraft paper. For making spinning fibers, ropes, unny cloth and the like, it is advisable to add, directly after cooking and washing, an oleaginous material, such as an emulsion of oil (e. g. mineral oil) and soap, as a lubricant. This serves as a conditioning material, and the oil employed may be mineral oil, fatty oil, or tar oil. The material is then run through rolls, which may be of hard material such as iron, or wood, or of soft yielding material such as rubber. If the rolls are made of hard ma terial they should not be pressed together too hard, since the strength of the fiber is liable to be injured if too much pressure is used. If desired a device similar to an ordinary laundry clothes-wringcr may be used in this operation. In case wooden or iron rolls are used it may be advisable to combine the oiling operation with the pressing operation, by allowing the bottom roll to dip into an oily material or an emulsion of an oily material. The rolled material can then run through a picker and a carding device and then may be used as a substitute for coir or cocoa fiber for making mats and matting or for making the coarse fabrics above referred to. Any of the waste from this operation may, if desired, be run through a pulper and can thereafter be used for making paper.
F or working up the material above referred to for making brush or broom fiber, the cooked material may be washed and treated with an oily material as above referred to after which it can be passed through rolls in the manner above referred to. The material can then be brushed or carded for removing tow as a by-product, which tow can be worked up into fabrics, rope or pulp as above described.
' VV'hen it is desired to produce very coarse bristles such as are used for brooms for street sweeping and the like, the cooked material, preferably after oiling, can be passed lengthwise through cutters'spaced to produce the desired thiclmess.
The fiber either in the form of pulp, textile fiber or broom fiber or finished'products containing these, may, if desired, be dyed by treatment with cotton dyes and alum, or other mordant.
Fiber made for brooms and brushes and Another suitable mixture for making the material water-resistant is one consisting of lead acetate solution and a solution of cop peras each containing gum or dextrin the two solutions being mixed together.
It is important to note that when using the small cane, particularly tecta, this material may be put into the digester without being cut into lengths, simply being bundled into largebundles to completely fill the digester or being made into small bundles which are then packed into the digester. These bundles are then cooked and on being runv through rollers, the material breaks up at the joints or nodes, leaving the fiber material for further treatment.
In treating large cane and bamboo for making fiber, the'cane may be cut into sections, cutting out the joints, or nodes, then making bundles of substantially uniform lengths of the cane material, preferably splitting up the same into several pieces. The nodes or joints which are thereby cut out can be cooked separately for the making of pulp so that it is not necessary to waste any of this material.
The digestive liquor above referred to is capable of being modified to some extent. The proportions of the materials as given above are those which have been found to give very satisfactory results. However,
good results can be secured even when omitting the potassium sulfate and in a few cases good results have been secured when using a solution of sodium sulfate and potassium sulfate in about the ratio above referred to, this being used in the amount of about 2 ounces per gallon of liquor. The particular preferred cooking liquor above referred to is especially advantageous in that it can be used over several times in the cooking of successive batches of the cane and it not necessary tov throw away the liquor and to make up fresh liquor after each cooking operation. T have repeatedly used the same liquor in more than a dozen successive cooks with satisfactory results. The cooked material may take out a small quantity. of the sulfates, and a portion of the water in the cooking liquor may be lost by evaporation owingto the high temperature used. The water in which the cooked material is soaked (and it may be noted that the time of soaking above given is merely by u ay of example) can be used in making up fresh quantities of liquor or can be used for making up any loss of liquor from the above solution. Further quantities of the sulfates referred to can be added from time to time. to prevent the liquid from becoming unduly weakened by absorption. Theliquid pressed out from the cooked material during the pressing operation above. referred to likewise can be used for making up additional. cooking liquid.
1' claim: v
1. A proces of treating cane material of the character set forth which comprises digesting the same in a solutiorrcontaining an alkali metal sulfate and Zinc sulfate.
2. A process of treating cane material of the character set forth which comprises digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, and. carrying the pressure up to at least 7 pounds, for not less than minutes.
3. A process of treating cane material of the character set forth which comprises. digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, and carrying the pressure up to. at least 100, pounds for not less than minutes.
4. A process of treating cane material of the character set forth which comprises digesting the same in a solution containing an fit alkali metal sulfate and zinc sulfate, and carrying the pressure up to about 140 pounds for about 90 to 180 minutes.
5. A process of treating cane material of the character set forth which comprises digesting the same in a solution containing sodium sulfate, potassium sulfate and zinc sulfate.
6. A process of treating cane material of the character set forth which colnprises digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, and thereafter running the cooked -material through pressure rolls.
7. A process of treating cane material of the character set forth which comprises digesting the same in a solution containing an alkali metal sulfate and zinc sulfate, running the cooled material through pressure rolls and applying an oleaginous material thereto, the last-mentioned two steps being in any desired order.
8. A process of treating cane material of the character set forth which comprises digesting the same in a solution containing a plurality of alkali metal sulfate solutions.
9. A process of treating cane material which comprises digesting the same in a sulfate solution containing a alkali metal sulfate under pressure above atmospheric, and thereafter crushing said material.
10. A process which comprises digesting cane material with a solution containin a plurality of sulfates including zinc sul ate and thereafter reducing the size of the pieces by mechanical treatment.
11. A process which comprises digesting cane material in a solution containing zinc sulfate and an alkali metal sulfate, such solution containing substantially less than 5% of dissolved salts.
12. A process which comprises digesting cane material in a solution containing zinc sulfate and an alkali metal sulfate, such solution containing about 1 to 2% of said salts, and being free from other strong added chemicals.
13. A process of treating cane material which comprises digesting the same in a solution containing an alkali metal salt and a soluble salt of another metal, such solution being of about 1% to 2% strength, and repeatedly using the same digesting solution with a plurality of batches of the said cane material.
14. A process of treating cellulosic and ligneous material which comprises digesting the same in a sulfate solution containing an alkali metal sulfate and a soluble earth metal sulfate, together amounting to not over 2%, such salts being the principal dissolved active constituents of such solution, such digestion being conducted under superatmospheric pressure, and repeatedly using the same digestive solution with a plurality of batches of the said cellulosic and ligneous material.
In testimony whereof I afiiX my signature.
ROBERT A. MARR.
Publications (1)
Publication Number | Publication Date |
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US1717800A true US1717800A (en) | 1929-06-18 |
Family
ID=3418276
Family Applications (1)
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US1717800D Expired - Lifetime US1717800A (en) | Robert a |
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