JPS6366960B2 - - Google Patents
Info
- Publication number
- JPS6366960B2 JPS6366960B2 JP593581A JP593581A JPS6366960B2 JP S6366960 B2 JPS6366960 B2 JP S6366960B2 JP 593581 A JP593581 A JP 593581A JP 593581 A JP593581 A JP 593581A JP S6366960 B2 JPS6366960 B2 JP S6366960B2
- Authority
- JP
- Japan
- Prior art keywords
- sodium
- pulp
- chlorides
- cooking
- liquor
- 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
Links
- 238000000034 method Methods 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 13
- 150000001805 chlorine compounds Chemical class 0.000 claims description 10
- 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 claims description 6
- 241001062472 Stokellia anisodon Species 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 2
- 239000002655 kraft paper Substances 0.000 claims 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 24
- 239000011780 sodium chloride Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229910001868 water Inorganic materials 0.000 description 11
- 238000010411 cooking Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000005406 washing Methods 0.000 description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 7
- 238000004061 bleaching Methods 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 238000009993 causticizing Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000007844 bleaching agent Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 239000001103 potassium chloride Substances 0.000 description 3
- 235000011164 potassium chloride Nutrition 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 239000004155 Chlorine dioxide Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 235000019398 chlorine dioxide Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- PVYJZLYGTZKPJE-UHFFFAOYSA-N streptonigrin Chemical compound C=1C=C2C(=O)C(OC)=C(N)C(=O)C2=NC=1C(C=1N)=NC(C(O)=O)=C(C)C=1C1=CC=C(OC)C(OC)=C1O PVYJZLYGTZKPJE-UHFFFAOYSA-N 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241001274216 Naso Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910001902 chlorine oxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- -1 sodium chloride Chemical class 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paper (AREA)
Description
【発明の詳細な説明】
本願に係る発明はナトリウムベースパルプ製造
工程中の薬液回収系統から塩化物を除去する方法
に関する。ナトリウムベースパルプ製造工程に於
て薬液回収系統中を循環する蒸解液中には塩化物
が含有され、これが薬液回収系統中の各機器の酸
性腐蝕の原因となり、従来より種々の塩化物回収
方法が試みられた。然しながら、いづれも除去が
不充分であり、又設備費が高価となり操業がむづ
かしく、実用的でない。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing chloride from a chemical recovery system during a sodium-based pulp manufacturing process. In the sodium-based pulp manufacturing process, the cooking liquor that circulates through the chemical recovery system contains chlorides, which causes acidic corrosion of various equipment in the chemical recovery system. Attempted. However, in either case, removal is insufficient, equipment costs are high, and operation is difficult and impractical.
本発明は、かかる問題を解決する新規なる塩化
物除去方法を提案することを目的としている。以
下本発明の詳細は添付図面を参照にして説明され
る。 The purpose of the present invention is to propose a new chloride removal method that solves this problem. The details of the invention will be explained below with reference to the accompanying drawings.
第２図は、従来のナトリウムベースパルプ製造
工程中の薬液回収系統のフローシートである。図
に於て、チツプを蒸解してパルプを生成する為、
蒸解工程１にチツプが装入されこれに薬液回収系
統より再循環される白液を加えて蒸解し、チツプ
中の繊維からニグリンが分離され、パルプを製造
し、パルプは漂白工程から回収される洗浄液によ
り、洗浄工程２で洗浄され、漂白工程９に送られ
て、ここで水・アルカリ・塩素、二酸化塩素が添
加されて漂白され、晒パルプとして系外に取出さ
れる。 FIG. 2 is a flow sheet of a chemical recovery system during a conventional sodium-based pulp manufacturing process. In the figure, in order to produce pulp by cooking chips,
Chips are charged into the cooking process 1, and white liquor recirculated from the chemical recovery system is added to the chips for cooking. Nigrin is separated from the fibers in the chips to produce pulp, and the pulp is recovered from the bleaching process. It is washed with a washing liquid in the washing step 2, sent to the bleaching step 9, where water, alkali, chlorine, and chlorine dioxide are added to bleach it, and it is taken out of the system as bleached pulp.
一方、洗浄工程２から排出されるパルプ以外の
物質は洗浄水等で希釈されて黒液３となり、濃縮
された後、回収ボイラー４で燃焼され、ボイラー
より発生した蒸気の熱はプロセスで使用される。
回収ボイラー４より排出される高温溶融状態のス
メルト（溶融塩）は後述の苛性化装置６より余剰
となつて発生する弱液によつて水溶解槽５にて希
釈水溶解され緑液となつて苛性化装置６へ送られ
る。苛性化装置６に於て緑液中の炭酸ナトリウム
に石灰泥に水を添加し焼成して生成した生石灰添
加して水酸化ナトリウムを生成する。 On the other hand, substances other than pulp discharged from the washing process 2 are diluted with washing water etc. to become black liquor 3, which is concentrated and then combusted in a recovery boiler 4, and the heat of the steam generated from the boiler is used in the process. Ru.
The high-temperature molten smelt (molten salt) discharged from the recovery boiler 4 is diluted and dissolved in water in the water dissolution tank 5 by a weak liquid generated as surplus from the causticizing device 6, which will be described later, to become green liquor. It is sent to the causticizing device 6. In the causticizing device 6, quicklime produced by adding water to lime mud and calcining the sodium carbonate in the green liquor is added to produce sodium hydroxide.
NaCO3＋CaO＋H2O→2NaOH＋CaCO3
該苛性化装置により生成した液には水及び硫化
ナトリウムの他に、塩化ナトリウム（NaCl）及
塩化カリウム（KCl）を含有しており、塩化ナト
リウムは、塩化ナトリウム除去工程７にて、これ
を濃縮し、結晶させて除去し、水酸化ナトリウム
及び硫化ナトリウムその他は白液として再び蒸解
工程１に蒸解液として使用される。塩化ナトリウ
ム除去工程７より除去された塩化ナトリウムは二
酸化塩発生工程８へ送られ、ここで塩素酸ナトリ
ウム（NaClO3）と硫酸が添加されて二酸化塩素
を生成し、
４NaClO3＋NaCl＋H2SO4→ClO2＋１／２Cl2＋
NaSO4＋H2O）
漂白工程９に於てパルプの漂白剤の１つとして
使用される。かかる従来の薬液回収系統に於て、
塩化ナトリウム除去工程以前の工程に於て当然、
塩化ナトリウム又は塩化カリウム等の塩化物が循
環しており、これが各工程機器の酸性腐蝕の原因
となり、又塩化ナトリウム除去工程７に於て濃縮
結晶化の為、多量の水分の蒸発が必要であり、多
量のエネルギーが必要となり装置も複雑となる欠
点がある。 NaCO 3 + CaO + H 2 O → 2NaOH + CaCO 3The liquid produced by the causticizing equipment contains sodium chloride (NaCl) and potassium chloride (KCl) in addition to water and sodium sulfide. In step 7, this is concentrated, crystallized and removed, and the sodium hydroxide, sodium sulfide, and others are used as white liquor in the cooking step 1 again as a cooking liquor. The sodium chloride removed from the sodium chloride removal step 7 is sent to the salt dioxide generation step 8, where sodium chlorate (NaClO 3 ) and sulfuric acid are added to generate chlorine dioxide, 4NaClO 3 +NaCl+H 2 SO 4 →ClO 2 + 1/2 Cl 2 + NaSO 4 + H 2 O) Used as one of the pulp bleaching agents in bleaching step 9. In such a conventional chemical liquid recovery system,
Naturally, in the process before the sodium chloride removal process,
Chlorides such as sodium chloride or potassium chloride are circulating, which causes acidic corrosion of each process equipment, and in the sodium chloride removal process 7, it is necessary to evaporate a large amount of water due to concentration and crystallization. However, there are disadvantages in that a large amount of energy is required and the equipment is complicated.
本発明はかかる従来の回収法の欠点を解決する
もので電解槽を設けて早期の段階で該塩化物を除
去するもので塩化物による工程機器の酸性腐蝕を
防止すると共に装置を簡略化することを目的とし
ている。本発明の１実施例を示す第１図に於て、
チツプが蒸解工程１に装入され、これに白液を加
えて蒸解され、生成されたパルプが洗浄工程２に
て漂白工程より回収される洗浄液によつて洗浄さ
れ、漂白工程９に送られ、ここで漂白された晒パ
ルプとして取出され、洗浄工程より排出されるパ
ルプ以外の物質は黒液として濃縮後、排出ボイラ
ー４に送られ、燃焼され、燃焼カスはスメルトと
して排出される迄の工程は従来例と異らない。然
し、本発明に於ては水溶解槽５に前置して、電解
装置１０を設け、スメルトを溶融塩の状態で電気
分解を行ない、スメルト中に溶融する塩化ナトリ
ウム及び塩化カリウムを塩素ガス及びナトリウム
とカリウムに分解し、塩素ガスを除去し、これを
前述の漂白工程に於ける漂白剤として使用する。
該電解装置にて塩化物を除去されたスメルトは水
溶解槽５にて弱液により稀釈され、緑液となつて
苛性化装置６へ送られ、ここで炭酸ナトリウムに
石灰泥に水を添加して焼成して生成した生石灰を
添加して苛性ソーダーを生成し直ちに白液として
蒸解工程１の蒸解液として使用する。 The present invention solves the drawbacks of such conventional recovery methods, and removes the chlorides at an early stage by providing an electrolytic bath, thereby preventing acid corrosion of process equipment caused by chlorides and simplifying the equipment. It is an object. In FIG. 1 showing one embodiment of the present invention,
Chips are charged into a cooking process 1, white liquor is added thereto and cooked, and the produced pulp is washed in a washing process 2 with the washing liquid recovered from the bleaching process, and sent to a bleaching process 9. Here, the bleached bleached pulp is taken out, and the substances other than the pulp discharged from the washing process are concentrated as black liquor, then sent to the discharge boiler 4 and burned, and the combustion residue is discharged as smelt. No different from the conventional example. However, in the present invention, an electrolytic device 10 is provided in front of the water dissolution tank 5, and the smelt is electrolyzed in the state of molten salt, and the sodium chloride and potassium chloride melted in the smelt are converted into chlorine gas and It is decomposed into sodium and potassium, removing chlorine gas, which is used as a bleaching agent in the bleaching process described above.
The smelt from which chlorides have been removed in the electrolytic device is diluted with a weak liquid in the water dissolving tank 5, turned into green liquor, and sent to the causticizing device 6, where water is added to sodium carbonate, lime mud, and so on. The quicklime produced by baking is added to produce caustic soda, which is immediately used as white liquor as the cooking liquor in the cooking step 1.
本発明法に於ては塩化物は既に電解装置１０に
於て脱塩されているので緑液中には塩化ナトリウ
ム等の塩化物は含有されておらず従来のものの如
き多量のエネルギーを要する複雑なる塩化ナトリ
ウム除去工程は必要とせず経済的であるのみなら
ず、機器の酸性腐蝕の心配もない。従来より該工
業界に於て薬液回収工程での塩化物による酸性腐
蝕は最も解決を要望される課題であつた。本発明
はかかる問題を完全に解決する優れた長所を有し
ている。 In the method of the present invention, the chlorides have already been desalted in the electrolyzer 10, so the green liquor does not contain chlorides such as sodium chloride, and the process is not complicated and requires a large amount of energy as in the conventional method. Not only is it economical as it does not require a sodium chloride removal process, but there is no need to worry about acid corrosion of the equipment. Acidic corrosion caused by chlorides in the chemical recovery process has traditionally been a problem most desired to be solved in the industry. The present invention has the great advantage of completely solving this problem.
第１図は本願発明の１実施例を示す線図、第２
図は従来のナトリウムベースパルプ製造工程中の
薬液回収系統のフローシートである。
尚、図中の主要部の符号は次の通りである。１
…蒸解工程、２…洗浄工程、３…黒液、４…回収
ボイラー、５…水溶解槽、６…苛性化装置、７…
塩化ナトリウム除去、８…二酸化塩発生工程、９
…漂白工程、１０…電解装置。
Figure 1 is a diagram showing one embodiment of the present invention, Figure 2 is a diagram showing one embodiment of the present invention;
The figure is a flow sheet of the chemical recovery system during the conventional sodium-based pulp manufacturing process. Incidentally, the symbols of the main parts in the figure are as follows. 1
...Cooking process, 2...Washing process, 3...Black liquor, 4...Recovery boiler, 5...Water dissolution tank, 6...Causticizing device, 7...
Sodium chloride removal, 8...Salt dioxide generation step, 9
...Bleaching process, 10...Electrolysis device.
Claims (1)
ーより排出される高温溶融状態のスメルトを電解
槽中に導入し、電気分解を行ない、溶融する塩化
物から塩素ガスを分解し、該塩素ガスを系外に分
離除去することを特徴とするナトリウムベースパ
ルプ製造工程の塩化物除去法。1. In the kraft pulp manufacturing process, high-temperature molten smelt discharged from a recovery boiler is introduced into an electrolytic tank, electrolysis is performed, chlorine gas is decomposed from the molten chloride, and the chlorine gas is removed from the system. A method for removing chlorides in a sodium-based pulp manufacturing process, which is characterized by separating and removing chlorides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP593581A JPS57121693A (en) | 1981-01-20 | 1981-01-20 | Removal of chloride in sodium base pulp making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP593581A JPS57121693A (en) | 1981-01-20 | 1981-01-20 | Removal of chloride in sodium base pulp making process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57121693A JPS57121693A (en) | 1982-07-29 |
| JPS6366960B2 true JPS6366960B2 (en) | 1988-12-22 |
Family
ID=11624749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP593581A Granted JPS57121693A (en) | 1981-01-20 | 1981-01-20 | Removal of chloride in sodium base pulp making process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57121693A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378813U (en) * | 1986-11-11 | 1988-05-25 | ||
| JPH0316549U (en) * | 1989-06-30 | 1991-02-19 |
-
1981
- 1981-01-20 JP JP593581A patent/JPS57121693A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378813U (en) * | 1986-11-11 | 1988-05-25 | ||
| JPH0316549U (en) * | 1989-06-30 | 1991-02-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57121693A (en) | 1982-07-29 |
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