JPS6272518A - Production of sodium sulfite - Google Patents
Production of sodium sulfiteInfo
- Publication number
- JPS6272518A JPS6272518A JP60210265A JP21026585A JPS6272518A JP S6272518 A JPS6272518 A JP S6272518A JP 60210265 A JP60210265 A JP 60210265A JP 21026585 A JP21026585 A JP 21026585A JP S6272518 A JPS6272518 A JP S6272518A
- Authority
- JP
- Japan
- Prior art keywords
- sodium sulfite
- aqueous solution
- gluconate
- na2so3
- flue gas
- 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.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、排煙中の亜硫酸ガ゛スと苛性ソーダから亜硫
酸ソーダを製造する方法、より詳細には。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing sodium sulfite from sulfite gas in flue gas and caustic soda.
湿式排煙脱硫による亜硫酸ソーダの製造方法で得られる
亜硫酸ソーダの品質を向上させる方法に関するものであ
る。The present invention relates to a method for improving the quality of sodium sulfite obtained by a method for producing sodium sulfite using wet flue gas desulfurization.
（従来の技術）
従来、金属精練１石油精製、ボイラー等で発生する排煙
中に含まれる亜硫酸ガスは、亜硫酸ソーダを製造する原
料として使用されている。すなわち、排煙中の亜硫酸ガ
スを苛性ソーダ水溶液に吸収させて１反応させ亜硫酸ソ
ーダを製造している。(Prior Art) Conventionally, sulfur dioxide gas contained in flue gas generated in metal smelting, petroleum refining, boilers, etc. has been used as a raw material for producing sodium sulfite. That is, sulfur dioxide gas in flue gas is absorbed into a caustic soda aqueous solution and subjected to one reaction to produce sodium sulfite.
このような湿式性排煙脱硫法は、使用する燃料のバラツ
キ、燃焼状態の変化、使用する苛性ソーダや水素に含ま
れる不純物などによって、生成する亜硫酸ソーダの品質
は変化する。In such a wet flue gas desulfurization method, the quality of the produced sodium sulfite varies depending on variations in the fuel used, changes in combustion conditions, and impurities contained in the caustic soda and hydrogen used.
とくに、亜硫酸ソーダの色が太き（変動し、商品価値を
著しく損うという問題を拘えている。In particular, the problem is that the color of sodium sulfite is thick (and fluctuates), which significantly reduces the product value.
（発明が解決しようとする問題点）
本発明の目的は、排煙中の亜硫酸ガスを原料として１着
色を抑えた亜硫酸ソーダの製造方法を提供することであ
る。(Problems to be Solved by the Invention) An object of the present invention is to provide a method for producing sodium sulfite using sulfur dioxide gas in flue gas as a raw material and suppressing one coloring.
（問題点を解決するための手段）
本発明者らは、上記目的を達成するため鋭意検討し１本
発明を完成するに到った。(Means for Solving the Problems) In order to achieve the above object, the present inventors have made extensive studies and have completed the present invention.
即ち１本発明は排煙中の亜硫酸ガスを苛性ソーダ水溶液
に吸収させ亜硫酸ソーダとして析出分離する湿式排煙脱
硫による亜硫酸ソーダの製造方法において、吸収から析
出分離の工程液中にグルコン酸塩を存在させることを特
徴とする亜硫酸ソーダの製造方法である。That is, 1. The present invention is a method for producing sodium sulfite by wet flue gas desulfurization, in which sulfur dioxide gas in flue gas is absorbed into a caustic soda aqueous solution and precipitated and separated as sodium sulfite, in which gluconate is present in the process liquid from absorption to precipitation separation. This is a method for producing sodium sulfite, which is characterized by the following.
湿式法排煙脱硫法による亜硫酸ソーダの製造法は、亜硫
酸ソーダ水溶液に亜硫酸ガスを含んだ高温の排煙を接触
させ吸収１反応せしめて、酸性亜硫酸ソーダにする工程
と次にこの酸性亜硫酸ソーダ水溶液を、苛性ソーダや炭
酸ソーダで中和して。The method for producing sodium sulfite using the wet flue gas desulfurization method involves the process of bringing an aqueous solution of sodium sulfite into contact with high-temperature flue gas containing sulfur dioxide gas and causing an absorption reaction to form acidic sodium sulfite. Neutralize with caustic soda or carbonated soda.
亜硫酸ソーダの結晶を析出させる工程、更に続いて、析
出した亜硫酸ソーダを分離乾燥して、亜硫酸ソーダを得
る工程からなる。The process consists of a step of precipitating sodium sulfite crystals, and then a step of separating and drying the precipitated sodium sulfite to obtain sodium sulfite.
分離工程で分離されたｒ液は、排煙中の亜硫酸ガスの吸
収に循環使用される。本発明の方法は。The r-liquid separated in the separation process is recycled and used to absorb sulfur dioxide gas in flue gas. The method of the present invention is.
このような亜硫酸ガスの吸収工程、中和析出工程。Such sulfur dioxide gas absorption process, neutralization precipitation process.
ｒ過工程を循環する水溶液にグルコン酸塩を存在させる
もので、特に中和析出工程でグルコン酸塩を存在させる
ものである。使用するグルコン酸塩としては、グルコン
酸カリウム、グルコン酸ナトリウム等のアルカリ金属塩
、グルコン酸マグネシウム、グルコン酸カルシウム等の
アルカリ土類金属塩等が望ましい。Gluconate is present in the aqueous solution circulating through the r-filtration step, and particularly gluconate is present in the neutralization precipitation step. The gluconate used is preferably an alkali metal salt such as potassium gluconate or sodium gluconate, or an alkaline earth metal salt such as magnesium gluconate or calcium gluconate.
又、これ等グルコン酸塩の添加量は、プロセス系内の液
中に１０ ｐｐｍ〜５０００ｐｐｍの濃度範囲、好まし
くは１１００ｐｐ〜１１０００ｐｐが適当である。１０
ｐｐｍ以下では、製品亜硫酸ソーダの着色のバラツキの
改良効果は得がたい、又５０００ｐｐｍ以上使用すると
亜硫酸ソーダ結晶の分離が困難である。グルコン酸塩の
添加は結晶のまま、系内に投入−しても良く、またグル
コン酸塩の水溶液の形で投入しても良い。グルコン酸塩
の投入は、工程液が循環使用されるならば、亜硫酸ガス
吸収工程、中和析出工程、結晶ｒ過工程のいずれの場所
で行っても良いが、中和析出工程では、グルコン酸塩が
有効濃度で存在することが必要である。The appropriate amount of these gluconate salts to be added is in the concentration range of 10 ppm to 5000 ppm, preferably 1100 ppm to 11000 ppm, in the liquid in the process system. 10
If it is less than ppm, it is difficult to improve the coloring variation of the sodium sulfite product, and if it is used in excess of 5,000 ppm, it is difficult to separate the sodium sulfite crystals. Gluconate may be added into the system in its crystal form, or may be added in the form of an aqueous solution of gluconate. Gluconate may be added at any point in the sulfur dioxide gas absorption step, neutralization precipitation step, or crystallization step if the process solution is used in circulation; however, in the neutralization precipitation step, gluconate It is necessary that the salt be present in an effective concentration.
（実施例） 以下、実施例により本発明を説明する。(Example) The present invention will be explained below with reference to Examples.
比較例−１ 苛性ソーダ水溶液を使用する湿式脱硫工場の。Comparative example-1 A wet desulfurization plant that uses aqueous caustic soda solution.
酸性亜硫酸ソーダ水溶液（ＮａＨ８Ｏ３８，３％（重量
％以下同じ）、Ｎａ２ＳＯ３１７％ 、 Ｎａ２ＳＯ４
１，９％ 。Acidic sodium sulfite aqueous solution (NaH8O38.3% (same weight %), Na2SO3 17%, Na2SO4
1.9%.
鉄分５．８ｐｐｍ（重量基準以下同じ）コクナジウム２
３０ｐｐｍ、ニッケル３．２１）ｐｍ） ５００りを、
攪拌機を備えた。容積１１のフラスコに装入した。この
内容物を攪拌しなから湯浴により９０℃に保った。続い
て、この酸性亜硫酸ソーダ水溶液中に４５チの苛性ソー
ダ水溶液を加えてｐＨ１２，３とし引き続き攪拌しなが
ら３時間かけて亜硫酸ソーダの結晶を析出させた。続い
て、この結晶を熱時ｒ過し、乾燥した。このようにして
得られた無水亜硫酸ソーダの粉末の黄色度Ｊｉｓ−に−
７０１３に従って測定した結果、黄色度は３３．６であ
った。又。Iron content 5.8ppm (same below weight standard) Cocunadium 2
30ppm, nickel 3.21)pm) 500ml,
Equipped with a stirrer. A flask with a volume of 11 was charged. The contents were kept at 90° C. in a water bath without stirring. Subsequently, 45 g of a caustic soda aqueous solution was added to this acidic sodium sulfite aqueous solution to adjust the pH to 12.3, and sodium sulfite crystals were precipitated over a period of 3 hours with continuous stirring. Subsequently, the crystals were heated and dried. The yellowness of the anhydrous sodium sulfite powder thus obtained is
As a result of measurement according to 7013, the yellowness was 33.6. or.
粉末の外観は、少し暗い茶色をしていた。The powder had a slightly dark brown appearance.
実施例−１ 比較例−１と同じ、酸性亜硫酸水溶液を用いて。Example-1 Using the same acidic sulfite aqueous solution as in Comparative Example-1.
同じ実験装置で、内温９０℃に保った後、グルコン酸カ
リウム２０チ水溶液を０．５ｇを加え、系内グルコン酸
カリウムの濃度を２００ ｐｐｍとした。続いて比較例
と同様にして、無水亜硫酸ソーダを得た。この亜硫酸ソ
ーダ結晶粉末の黄色度は、 １３．４であった。又粉末
の外観は淡黄色であった。In the same experimental apparatus, after maintaining the internal temperature at 90° C., 0.5 g of a 20% potassium gluconate aqueous solution was added to bring the concentration of potassium gluconate in the system to 200 ppm. Subsequently, anhydrous sodium sulfite was obtained in the same manner as in the comparative example. The yellowness of this sodium sulfite crystal powder was 13.4. The appearance of the powder was pale yellow.
実施例−２
グルコン酸ソーダ２０％水溶−９ｔ、２５９を加える以
外は、実施例１と同じ操作を行ない、外観は白色の、無
水亜硫酸ソーダ結晶の粉末を得た。Example 2 The same operation as in Example 1 was carried out except that 20% sodium gluconate aqueous solution -9t, 259 was added to obtain anhydrous sodium sulfite crystal powder having a white appearance.
この粉末の黄色度は、 １２．１であった。The yellowness of this powder was 12.1.
実施例−３ グルコン酸カルシウム０．３９を加える以外は。Example-3 Except adding 0.39 calcium gluconate.
実施例−１と同じ操作を行ない、外観白色の無水亜硫酸
ソーダを得た。The same operation as in Example 1 was performed to obtain anhydrous sodium sulfite having a white appearance.
得られた亜硫酸ソーダ結晶粉末の黄色度は、 １２．３
であった。The yellowness of the obtained sodium sulfite crystal powder is 12.3.
Met.
実施例−４
酸性亜硫酸ソーダ９．４％、亜硫酸ソーダ１８．２ ％
硫酸ソーダ１．１％を含む、水素イオン濃度ｐＨ６，７
緑色を示す排煙脱硫工場の酸性亜硫酸ソーダ水溶液１０
０ｍｊに、固形のグルコン酸ソーダ０．１ ｇを加えて
溶解させた。この水溶液に３５チの苛性ソーダ水溶液を
加えて、 ｐＨ１２，８とした。その後室温の条件下、
２０時間静置したところ、無色透明な結晶水を含んだ亜
硫酸ソーダが得られた。Example-4 Acidic sodium sulfite 9.4%, sodium sulfite 18.2%
Contains 1.1% sodium sulfate, hydrogen ion concentration pH 6,7
Acidic sodium sulfite aqueous solution from flue gas desulfurization plant showing green color 10
0.1 g of solid sodium gluconate was added to and dissolved in 0 mj. To this aqueous solution, 35 g of aqueous caustic soda solution was added to adjust the pH to 12.8. Then under room temperature conditions,
When the mixture was allowed to stand for 20 hours, colorless and transparent sodium sulfite containing water of crystallization was obtained.
比較例−２
グルコン酸ソーダを加えること以外は、実施例−４と同
じ実験により結晶水をもった。亜硫酸ソーダの結晶を得
た。この結晶は、茶色に着色しており、且つ、茶色の沈
澱物も付着していた。Comparative Example 2 Crystal water was prepared in the same experiment as in Example 4 except that sodium gluconate was added. Crystals of sodium sulfite were obtained. The crystals were colored brown, and brown precipitates were also attached.
以上の実施例および比較例が示すように、本発明の方法
は、亜硫酸ソーダ製造工程で着色防止に。As shown in the above Examples and Comparative Examples, the method of the present invention can be used to prevent coloring in the soda sulfite production process.
顕著な効果を発揮するものである。It has a remarkable effect.
（発明の効果）
湿式排煙脱硫方式による亜硫酸ソーダの製造プロセスに
おいては、使用する燃料中に含まれる。(Effects of the Invention) In the manufacturing process of sodium sulfite using the wet flue gas desulfurization method, it is contained in the fuel used.
無機物が、燃料の燃焼時に生成する排煙ガスに伴って、
脱硫プロセスの吸収工程へ持ち込まれる。Inorganic substances are produced in the flue gas produced during fuel combustion.
It is carried into the absorption stage of the desulfurization process.
従って亜硫酸ガスを吸収した酸性亜硫酸水溶液中には、
鉄、ニッケル、バナジウム、マグネシウム。Therefore, in the acidic sulfite aqueous solution that has absorbed sulfur dioxide gas,
Iron, nickel, vanadium, magnesium.
銅等の金属イオンが微量台まれている。この酸性亜硫酸
ソーダ溶液は中和工程で苛性ソーダ等のアルカリと反応
し、亜硫酸ノーダ液となるが不純物として含まれている
金属が、中和、塩基性に変化した時に、水酸化物等に変
化し、亜硫酸ソーダの結晶析出時に付着又は吸着により
亜硫酸ソーダ結晶中にとり込まれ、結晶亜硫酸ソーダの
純度を下げたり１着色するという現象を引き起すもので
ある。本発明に従かいグルコン酸塩を加えることによっ
て、中和工程で、不純物金属イオンは、グルコン酸塩に
よって水溶液に溶解可能な状態に保たれるので、亜硫酸
ソーダ結晶中にとり込まれることな（、亜硫酸ソーダの
純度低下もな（、白一色の結晶が得られる。Contains trace amounts of metal ions such as copper. This acidic sodium sulfite solution reacts with an alkali such as caustic soda during the neutralization process and becomes a sulfite sodium solution, but when the metals contained as impurities are neutralized and changed to basicity, they change to hydroxides, etc. When the sodium sulfite crystals are precipitated, they are incorporated into the sodium sulfite crystals by adhesion or adsorption, causing a phenomenon in which the purity of the crystalline sodium sulfite decreases or it becomes colored. By adding gluconate according to the invention, during the neutralization step, impurity metal ions are kept soluble in the aqueous solution by the gluconate and are therefore not incorporated into the sodium sulfite crystals ( There is no decrease in the purity of sodium sulfite (solid white crystals are obtained.
Claims (1)
亜硫酸ソーダとして析出分離する湿式排煙脱硫による亜
硫酸ソーダの製造方法において、吸収から析出分離の工
程液中にグルコン酸塩を存在させることを特徴とする亜
硫酸ソーダの製造方法1) A method for producing sodium sulfite by wet flue gas desulfurization, in which sulfur dioxide gas in flue gas is absorbed into a caustic soda aqueous solution and precipitated and separated as sodium sulfite, characterized by the presence of gluconate in the process liquid from absorption to precipitation separation. Method for producing sodium sulfite
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60210265A JPS6272518A (en) | 1985-09-25 | 1985-09-25 | Production of sodium sulfite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60210265A JPS6272518A (en) | 1985-09-25 | 1985-09-25 | Production of sodium sulfite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6272518A true JPS6272518A (en) | 1987-04-03 |
| JPH0449488B2 JPH0449488B2 (en) | 1992-08-11 |
Family
ID=16586523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60210265A Granted JPS6272518A (en) | 1985-09-25 | 1985-09-25 | Production of sodium sulfite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6272518A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214718A (en) * | 1992-02-07 | 1993-08-24 | Unyusho Daiyon Kowan Kensetsu Kyokucho | Control mechanism for wave |
| JP2015536822A (en) * | 2012-11-29 | 2015-12-24 | アルファ−ラヴァル・コーポレート・アーベー | Systems for cleaning exhaust gas, use of such systems, and multiple systems |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245585A (en) * | 1975-10-08 | 1977-04-11 | Sumitomo Chem Co Ltd | Method of stabilizing properties of crystal in flue gas desulfurizatio n process |
| JPS5247735A (en) * | 1975-10-14 | 1977-04-15 | Canon Inc | Material for receiving transferred image |
| JPS5322192A (en) * | 1976-08-13 | 1978-03-01 | Nisso Kinzoku Kk | Manufacturing process for higher purity sodium sulfite anhydride |
| JPS5347219A (en) * | 1976-10-12 | 1978-04-27 | Fujitsu Ltd | Orientating device for fault spot |
-
1985
- 1985-09-25 JP JP60210265A patent/JPS6272518A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245585A (en) * | 1975-10-08 | 1977-04-11 | Sumitomo Chem Co Ltd | Method of stabilizing properties of crystal in flue gas desulfurizatio n process |
| JPS5247735A (en) * | 1975-10-14 | 1977-04-15 | Canon Inc | Material for receiving transferred image |
| JPS5322192A (en) * | 1976-08-13 | 1978-03-01 | Nisso Kinzoku Kk | Manufacturing process for higher purity sodium sulfite anhydride |
| JPS5347219A (en) * | 1976-10-12 | 1978-04-27 | Fujitsu Ltd | Orientating device for fault spot |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05214718A (en) * | 1992-02-07 | 1993-08-24 | Unyusho Daiyon Kowan Kensetsu Kyokucho | Control mechanism for wave |
| JP2015536822A (en) * | 2012-11-29 | 2015-12-24 | アルファ−ラヴァル・コーポレート・アーベー | Systems for cleaning exhaust gas, use of such systems, and multiple systems |
| US9844752B2 (en) | 2012-11-29 | 2017-12-19 | Alfa Laval Corporate Ab | System, a use of such a system and a multi system for cleaning exhaust gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0449488B2 (en) | 1992-08-11 |
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