US3378500A - Process for breaking down foam - Google Patents
Process for breaking down foam Download PDFInfo
- Publication number
- US3378500A US3378500A US507646A US50764665A US3378500A US 3378500 A US3378500 A US 3378500A US 507646 A US507646 A US 507646A US 50764665 A US50764665 A US 50764665A US 3378500 A US3378500 A US 3378500A
- Authority
- US
- United States
- Prior art keywords
- foam
- acid
- breaking down
- pulp
- down foam
- 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
- 239000006260 foam Substances 0.000 title description 19
- 238000000034 method Methods 0.000 title description 19
- 239000002253 acid Substances 0.000 description 14
- 239000002657 fibrous material Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 150000007522 mineralic acids Chemical class 0.000 description 4
- 238000005187 foaming Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 229940044609 sulfur dioxide Drugs 0.000 description 2
- 235000010269 sulphur dioxide Nutrition 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229960003010 sodium sulfate Drugs 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
Definitions
- This invention relates to a process in the technique of producing pulp from cellulosic fibrous material by an aqueous alkaline process.
- a pulp as e.g. when using the sodaor sulfate method or the alkaline sulfite method, intense foaming occurs, particularly when the pulp produced has a Roe-number above 4, eg when oxidizing the residual liquor and when washing the pulp, due to the soaps having been formed from resinous and fatty substances in the wood.
- the conventional soda and sulfate methods of producing pulp from cellulos-ic fibrous material are treated in greater detail in Othmers Encyclopedia of Chemical Technology (1953), Vol. 11 particularly pages 263-266 and details of the alkaline sulfite method may be found in US. Patent No. 3,046,182 to Tomlinson et al.
- the foam so formed will be broken down if it is allowed to stand sufficiently long a period of time, and this breaking down may also be accelerated by means of mechanical devices.
- this breaking down may also be accelerated by means of mechanical devices.
- This invention is directed to a process in which such disadvantages are eliminated and this invention comprises separating the foam and bringing the foam as separated in contact with an inorganic acid.
- This acid is preferably a strong acid, as e.g. a mineral acid, particularly sulfuric 3,378,500 Patented Apr. 16, 1968 acid or hydrochloric acid. If desired, it can also be a gas, e.g. sulfurdioxide.
- the expression inorganic acid is also intended to mean so called acid salts, as e.g. acid sodiumsulfate, which salts can be considered as a neutral salt plus acid.
- the acid can be used in concentrated or diluted form the diluents preferably being aqueous, as e.g. usually water.
- the acid can be sprayed to the foam from a pipe or supplied to the foam in a finely divided form (e.g. an atomized form) in another manner known per se when the foam has been separated from the foaming material, i.e. the residual liquor.
- the acid can be mixed with the foam in an ejector. It is also possible to mix the foam with the acid in a packed column so that the foam also in this case is treated separately.
- said acid is selected from the group consisting of sulfuric acid and hydrochloric acid.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Description
United States Patent 3,378,500 PRDCESS FOR BREAKING DOWN FOAM Carl Robert Sahlberg, 1 Ingentingsgatan, Solna, Sweden No Drawing. Filed Nov. 15, 1965, Ser. No. 507,646 Claims priority, application Sweden, Nov. 16, 1964, 13,807/ 64 5 Claims. (Cl. 252-321) ABSTRACT OF THE DISCLOSURE In the production of pulp from cellulcsic fibrous material by conventional aqueous alkaline methods, the process of breaking down foam which comprises separating same and bringing it into contact with an inorganic acid in liquid or gaseous form.
This invention relates to a process in the technique of producing pulp from cellulosic fibrous material by an aqueous alkaline process. When producing such a pulp, as e.g. when using the sodaor sulfate method or the alkaline sulfite method, intense foaming occurs, particularly when the pulp produced has a Roe-number above 4, eg when oxidizing the residual liquor and when washing the pulp, due to the soaps having been formed from resinous and fatty substances in the wood. The conventional soda and sulfate methods of producing pulp from cellulos-ic fibrous material are treated in greater detail in Othmers Encyclopedia of Chemical Technology (1953), Vol. 11 particularly pages 263-266 and details of the alkaline sulfite method may be found in US. Patent No. 3,046,182 to Tomlinson et al.
The foam so formed will be broken down if it is allowed to stand sufficiently long a period of time, and this breaking down may also be accelerated by means of mechanical devices. When the foam has obtained a certain stability and the amount of foam is great, there is nevertheless no possibility to break down all the foam with those mechanical devices.
This invention is directed to a process in which such disadvantages are eliminated and this invention comprises separating the foam and bringing the foam as separated in contact with an inorganic acid. This acid is preferably a strong acid, as e.g. a mineral acid, particularly sulfuric 3,378,500 Patented Apr. 16, 1968 acid or hydrochloric acid. If desired, it can also be a gas, e.g. sulfurdioxide. The expression inorganic acid is also intended to mean so called acid salts, as e.g. acid sodiumsulfate, which salts can be considered as a neutral salt plus acid. The acid can be used in concentrated or diluted form the diluents preferably being aqueous, as e.g. usually water.
The mechanism when using this process seems to be that the soap being present in the foam is broken down so that free resinous and fatty acids are formed the ability to foam being lost.
The acid can be sprayed to the foam from a pipe or supplied to the foam in a finely divided form (e.g. an atomized form) in another manner known per se when the foam has been separated from the foaming material, i.e. the residual liquor. Alternatively, the acid can be mixed with the foam in an ejector. It is also possible to mix the foam with the acid in a packed column so that the foam also in this case is treated separately.
What I claim is:
1. In a process for producing pulp from cellulosic fibrous material by an aqueous alkaline process in which intense foaming occurs due to the formation of soaps from resinous and fatty substances in said cellulosic fibrous material, the method which comprises separating said foam and contacting same with an inorganic acid in an amount suflicient to break down the foam to form free resinous and fatty acids.
2. The process according to claim 1 wherein said acid is supplied in form of a gas.
3. The process according to claim 2 wherein said gas is sulfur dioxide.
4. The process according to claim 1 wherein said acid is supplied in form of a dilute solution.
5. The process according to claim 4 wherein said acid is selected from the group consisting of sulfuric acid and hydrochloric acid.
References (Jited UNITED STATES PATENTS 2,317,139 4/ 1943 Frantz 25-2-321 2,622,107 12/1952 Mattson 252-321 X 2,668,150 2/1954 Luvisi 252-321 LEON D. ROSDOL, Primary Examiner.
R. D. LOVERING, Examiner.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE13807/64A SE300354B (en) | 1964-11-16 | 1964-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3378500A true US3378500A (en) | 1968-04-16 |
Family
ID=20298024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US507646A Expired - Lifetime US3378500A (en) | 1964-11-16 | 1965-11-15 | Process for breaking down foam |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3378500A (en) |
| SE (1) | SE300354B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2317139A (en) * | 1939-07-20 | 1943-04-20 | Colorado Fuel & Iron Corp | Froth breaking |
| US2622107A (en) * | 1950-10-28 | 1952-12-16 | Ethyl Corp | Manufacture of alkyl chlorides |
| US2668150A (en) * | 1951-03-26 | 1954-02-02 | Nat Aluminate Corp | Antifoam compositions and method of foam inhibition |
-
1964
- 1964-11-16 SE SE13807/64A patent/SE300354B/xx unknown
-
1965
- 1965-11-15 US US507646A patent/US3378500A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2317139A (en) * | 1939-07-20 | 1943-04-20 | Colorado Fuel & Iron Corp | Froth breaking |
| US2622107A (en) * | 1950-10-28 | 1952-12-16 | Ethyl Corp | Manufacture of alkyl chlorides |
| US2668150A (en) * | 1951-03-26 | 1954-02-02 | Nat Aluminate Corp | Antifoam compositions and method of foam inhibition |
Also Published As
| Publication number | Publication date |
|---|---|
| SE300354B (en) | 1968-04-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4400237A (en) | Process for bleaching cellulose with organic peracid | |
| US3901869A (en) | Acidification of tall oil soap | |
| GB1308994A (en) | Dissolving pulp and process for the production thereof | |
| UA79867C2 (en) | Method for chlorine dioxide obtaining | |
| GB1153039A (en) | A Method and apparatus for the Production of Hot Water | |
| NO852472L (en) | PROCEDURE FOR DELIGNIFICATION AND WHITING OF CHEMICAL MASSES. | |
| US3975505A (en) | Production of chlorine dioxide | |
| US3843473A (en) | Impregnation of cellulosic pulp under superatmospheric pressure with waste alkaline oxygan gas bleaching liquor followed by oxygen-alkali bleaching | |
| KR930021600A (en) | Method for preparing carboxylic ester | |
| US3378500A (en) | Process for breaking down foam | |
| EP0827528B1 (en) | Neutralization of tall oil soap | |
| US3485856A (en) | Process for the production of light colored surface active esters of sulfo-fatty acids and salts thereof | |
| NO885408L (en) | PROCEDURE FOR THE MANUFACTURE OF SOLID OR PASFORMED PRODUCTS. | |
| US1298553A (en) | Bleaching process. | |
| US2772138A (en) | Continuous bleaching process | |
| JPS6261716B2 (en) | ||
| FI933831A (en) | Method for acidifying a salt with a large overdose of NaHSO3 solution | |
| US1836563A (en) | Method for foam abatement and chemical recovery | |
| US2511043A (en) | Process in neutralizing capillary active sulfonated products | |
| US2766276A (en) | Neutralization of sulfonic acids | |
| US3937632A (en) | Method for brightening and whitening clays utilizing sodium borohydride | |
| JPS583074B2 (en) | Palpuno Kasan Kabutsu Hiyou Hakuhou | |
| US1868151A (en) | Process for preparing solid or half-solid solutions of alkaline hypochlorites | |
| US2866683A (en) | Manufacture of chlorine dioxide from an alkali metal chlorate and an alkali metal bisulfite | |
| SU1065395A1 (en) | Process for preparing foaming agent for fire extinguishing purposes |