US3695995A - Oxygen-peracetic acid-chlorine dioxide pulp bleaching sequence - Google Patents
Oxygen-peracetic acid-chlorine dioxide pulp bleaching sequence Download PDFInfo
- Publication number
- US3695995A US3695995A US40404A US3695995DA US3695995A US 3695995 A US3695995 A US 3695995A US 40404 A US40404 A US 40404A US 3695995D A US3695995D A US 3695995DA US 3695995 A US3695995 A US 3695995A
- Authority
- US
- United States
- Prior art keywords
- pulp
- stage
- peracetic acid
- chlorine dioxide
- oxygen
- 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
- 238000004076 pulp bleaching Methods 0.000 title description 4
- -1 Oxygen-peracetic acid-chlorine dioxide Chemical compound 0.000 title description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 31
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 abstract description 29
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 abstract description 26
- 238000000034 method Methods 0.000 abstract description 22
- 238000004061 bleaching Methods 0.000 abstract description 15
- 239000004155 Chlorine dioxide Substances 0.000 abstract description 13
- 235000019398 chlorine dioxide Nutrition 0.000 abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 229920000875 Dissolving pulp Polymers 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000001012 protector Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- 235000011121 sodium hydroxide Nutrition 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 229920001131 Pulp (paper) Polymers 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000002655 kraft paper Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000006213 oxygenation reaction Methods 0.000 description 2
- 229920001021 polysulfide Polymers 0.000 description 2
- 239000005077 polysulfide Substances 0.000 description 2
- 150000008117 polysulfides Polymers 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000002020 sage Nutrition 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Definitions
- the present invention relates to a novel 2 or 3 stage sequence for the delignification and bleaching of chemical pulps.
- an unrefined, digested chemical pulp prepared by either the sulfate or sulfite process, and having a consistency of from about 3% to 35% and pref- 3,695,995 Patented Oct. 3, 1972 erably above 20%, based on the weight of the oven-dried pulp, is contacted or reacted with oxygen, at a temperature of from about 70 C. to about 140 C., preferably about 100 C., and a pressure of from about 60 psi.
- protector compound selected from the group consisting of polysulfides having the formula Na S wherein x is an integer from 1 to 4, and Na S O Throughout this application the use of the term protector compound shall mean either an oxidizing or reducing agent which is capable of preventing the degradation and depolymerization of the cellulosic portion of the pulp by reacting with the carbonyl end groups, to convert them into hydroxyl groups when Na S O a reducing agent is used, or carboxyl groups, when Na s an oxidizing agent is used.
- Na S is the preferred polysulfide.
- the concentration of Na S O or Na S should be at least about 0.2% and preferably from about 2% to about 10%, based on the weight of the oven-dry pulp. If concentrations in excess of 10% are employed, costs are increased and no additional benefits are obtained.
- the protectors contain only sodium and sulfur ions, both of which are present in sulfate or sulfite pulping systems, the efiiuent can be fed back into the chemical recovery system thereby preventing stream pollution which would otherwise occur if the efiiuent were emptied into the stream, as is conventionally done.
- pulps having a lignin content of 5% or above are employed, the addition of from about 1% to about 5% of sodium hydroxide to the reaction mixture can speed up the reaction rate. Also, if the concentration of Na S O or Na S is 2% or less, sodium hydroxide can be employed to good advantage.
- the partially bleached pulp of the first stage is subjected in the second stage to a bleach with peracetic acid.
- concentration of the peracetic acid can be from about 0.5% to about 2.0%, preferably 1.0%, based on the weight of the oven-dried pulp, and the pulp consistency can be from about 10% to about 20%, preferably between about 10% and about 15%.
- the reaction can be carried out at a temperature of from about 50 C. to about 90 C., with 70 C. being preferred.
- the initial or starting pH must be within the range of from about 8.0 to about 12.0, with a range of from about 8.0 to about 10.0 being preferred.
- the pH can be adjusted by adding Na CO and/or NaOH.
- the initial pH must be adjusted to 8.0 or above to optimize the bleaching results.
- the pulp after the first and second stages namely, oxygen (0) and peracetic acid (Pa), has a brightness of 60% or above and can be utilized as newsprint furnish.
- the pulp is treated in a third stage with chlorine dioxide.
- Either gaseous chloride dioxide or chlorine dioxide in solution can be employed.
- the consistency of the pulp can be from about 10% to about 20%, preferably between 10% and 15%, based on the weight of the oven-dried pulp.
- the concentration of the C10 can be from about 0.5% to about 2.0%, based on the weight of the oven-dried pulp.
- the reaction can be carried out at a temperature of from about 50 C. to about C., preferably 70 C., and at a starting pH be tween 5.0 and 6.0 for a period of from about 30 minutes to about minutes.
- the pulp consistency can be from about 10% to about 40%, with a consistency above 30% being preferred.
- the reaction time can be reduced to about to minutes and can take place at a temperature of from about 20 C. to above 5 90 C., with 70 C. being preferred.
- the semi-bleached pulp was then thoroughly washed with water and centrifuged. The brightness of the pulp was found to be 64% as measured in accordance with Tappi Standard Method T217.
- the semi-bleached pulp was thoroughly washed with water and centrifuged. The brightness of the pulp was found to be 66% as measured in accordance with Tappi Standard Method T217.
- EXAMPLE 2 A 100 grams sample of a hardwood pulp, which had been prepared in accordance with the kraft process and which had then been washed with deionized water, was bleached as follows. (The first stage was carried out in an electrically heated pressure reactor.)
- the plup was further bleached in accordance with stage 2 below.
- the O-Pa-D sequence of the present invention results in a fully bleached pulp of a brightness comparable to that obtained by a S-stage bleaching sequence and having a higher opacity.
- the physical properties are equiva- 5 lent to those obtained by a conventional bleaching sequence.
- a two-stage process for bleaching chemical pulps to a brightness of 60% or above which comprises:
- a three-stage process for bleaching chemical pulps to a brightness of 80% or above which comprises:
- chlorine dioxide in the third stage is chlorine dioxide in solution with a consistency of from about 10% to about 20%, based on the weight of the oven-dried pulp, and the temperature is about 70 C. for a period of from about 30 to about 120 minutes.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4040470A | 1970-05-25 | 1970-05-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3695995A true US3695995A (en) | 1972-10-03 |
Family
ID=21910799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US40404A Expired - Lifetime US3695995A (en) | 1970-05-25 | 1970-05-25 | Oxygen-peracetic acid-chlorine dioxide pulp bleaching sequence |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3695995A (fi) |
| JP (1) | JPS5510714B1 (fi) |
| CA (1) | CA939855A (fi) |
| DE (1) | DE2124325C3 (fi) |
| FI (1) | FI59432C (fi) |
| FR (1) | FR2095038A5 (fi) |
| SE (1) | SE375565C (fi) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080087390A1 (en) * | 2006-10-11 | 2008-04-17 | Fort James Corporation | Multi-step pulp bleaching |
| WO2012037024A2 (en) | 2010-09-16 | 2012-03-22 | Georgia-Pacific Consumer Products Lp | High brightness pulps from lignin rich waste papers |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT378016B (de) * | 1982-12-02 | 1985-06-10 | Ver Edelstahlwerke Ag | Verfahren zum entfaerben und/oder bleichen von zellulosematerial, insbesondere zellstoff, und vorrichtung zur durchfuehrung des verfahrens |
-
1970
- 1970-05-25 US US40404A patent/US3695995A/en not_active Expired - Lifetime
- 1970-12-11 CA CA100,406A patent/CA939855A/en not_active Expired
-
1971
- 1971-05-12 JP JP3187971A patent/JPS5510714B1/ja active Pending
- 1971-05-17 DE DE2124325A patent/DE2124325C3/de not_active Expired
- 1971-05-21 FI FI1406/71A patent/FI59432C/fi active
- 1971-05-24 SE SE7106636A patent/SE375565C/xx unknown
- 1971-05-25 FR FR7118899A patent/FR2095038A5/fr not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080087390A1 (en) * | 2006-10-11 | 2008-04-17 | Fort James Corporation | Multi-step pulp bleaching |
| WO2012037024A2 (en) | 2010-09-16 | 2012-03-22 | Georgia-Pacific Consumer Products Lp | High brightness pulps from lignin rich waste papers |
| US8845860B2 (en) | 2010-09-16 | 2014-09-30 | Georgia-Pacific Consumer Products Lp | High brightness pulps from lignin rich waste papers |
Also Published As
| Publication number | Publication date |
|---|---|
| SE375565C (sv) | 1984-07-16 |
| JPS5510714B1 (fi) | 1980-03-18 |
| FR2095038A5 (fi) | 1972-02-04 |
| DE2124325B2 (de) | 1979-09-27 |
| FI59432C (fi) | 1981-08-10 |
| FI59432B (fi) | 1981-04-30 |
| DE2124325A1 (de) | 1971-12-09 |
| SE375565B (fi) | 1975-04-21 |
| DE2124325C3 (de) | 1980-06-19 |
| CA939855A (en) | 1974-01-15 |
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