WO1991009154A1 - Desoxydant pour chaudiere et procede d'extraction de l'oxygene dissous dans l'eau d'une chaudiere - Google Patents
Desoxydant pour chaudiere et procede d'extraction de l'oxygene dissous dans l'eau d'une chaudiere Download PDFInfo
- Publication number
- WO1991009154A1 WO1991009154A1 PCT/JP1990/001609 JP9001609W WO9109154A1 WO 1991009154 A1 WO1991009154 A1 WO 1991009154A1 JP 9001609 W JP9001609 W JP 9001609W WO 9109154 A1 WO9109154 A1 WO 9109154A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- starch
- boiler
- weight
- water
- oxygen
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/173—Macromolecular compounds
Definitions
- the present invention relates to a deoxidizer for boilers and a method for removing dissolved oxygen from boiler water, which is particularly safe for the human body and does not cause a decrease in concentration in a dissolving tank.
- the present invention relates to a deoxidizer for boilers, that is, an agent for removing dissolved oxygen in boiler water and a method for removing dissolved oxygen in boiler water using the same.
- oxygen scavengers Conventionally, hydrazine has been most frequently used as an oxygen scavenger. Since hydrazine is a reaction product of oxygen and nitrogen and water, hydrazine has advantages such as no increase in dissolved solids in boiler water and concentration control. However, it is not used in systems that use live steam due to concerns about adverse effects on the human body.
- sodium sulfite a food additive-approved product
- sodium sulfite is a highly safe oxygen absorber, but its concentration in the dissolution tank is too high due to the rapid reaction with oxygen. It has the disadvantage of causing a decrease and, conversely, promoting corrosion in the boiler can.
- aqueous oxygen scavenger composition in which 0.005 to 20 parts of dextrin is added to 100 parts of an alkali metal sulfite is proposed (Japanese Patent Application Laid-Open No. 57-7 / 1983). 225)), but dextrin is formulated to increase the stability of sulfite, and the deoxygenation effect is exhibited by sulfite.
- Starch is used as a corrosion inhibitor for boilers, but is not known as an oxygen scavenger. Naturally, natural starch has the disadvantage that it has a high viscosity and is not easy to handle.
- DE Dextrose Equivalent, Dextrose Equivalent
- the starch is measured by acid digestion, enzymatic digestion, oxidative digestion, etc., and the reducing sugar is measured as glucose.
- the ratio to DE is increased, and the starch is soluble in cold water. If the starch obtained in this way is added to boiler water as a deoxidizer as it is, the power consumption of the boiler water is greatly reduced. Therefore, there is a problem that it is necessary to use an alkaline agent together.
- the composition described in Japanese Patent Application Laid-Open No. 57-72225 has the following disadvantages.Since the oxygen scavenger as the main agent is an aluminum sulfite metal salt, corrosion in the boiler can be caused. The problem has been solved.
- An object of the present invention is to provide a boiler deoxidizer and a method for removing dissolved oxygen in boiler water, which have a remarkably low consumption.
- the oxygen scavenger for boilers of the present invention contains a starch derivative obtained by introducing 0.01 to 5% by weight, in terms of S or N, of a nitrogen-containing group into a starch having a DE of 1% or more. And '.
- Dissolved oxygen removal method of boiler water of the present invention '1% or more starch, I O ⁇ or a nitrogen-containing group' DE force 5 made by introducing 0.0 1-5% by weight S, or N in terms It is characterized in that a starch derivative is added to a boiler water system.
- the starch derivative according to the present invention has an excellent deoxygenating function and is water-soluble, so it is easy to handle. In addition, it is nontoxic and highly safe. In addition, the concentration does not decrease in the dissolving tank (drug injection tank). In addition, the boiler water system does not cause a decrease in the P-al force.
- the starch derivative according to the present invention does not consume the alkalinity, but the y- or nitrogen-containing groups introduced into the hydroxyl groups of the starch inhibit the consumption of the sodium hydroxide in water. It is presumed that it is suppressed as much as possible.
- starch derivatives used in the deoxidizer for boilers of the present invention include natural starch such as corn starch, potato starch, sweet potato starch, tapio starch, and the like.
- modified starch such as esterified starch, oxidized starch, and etherified starch can be used.
- the starch derivative used in the present invention may be either cold water soluble or heat soluble, and is not particularly limited. However, cold water soluble starch derivatives are preferred for handling.
- cold-water-soluble starch derivative those obtained by making the above-mentioned raw material starch soluble in cold water by an acid solution method, an enzymatic decomposition method, an oxidative decomposition method or the like can be used.
- Starch derivatives of the present invention the DE force s 1% or more t, also forces favored and to Ru in particular 2-3 0% der.
- D E When D E is less than 1%, the amount required for deoxidation becomes extremely large. On the other hand, even if DE exceeds 30%, it can be used as the starch of the present invention. However, when it is mixed with Alcali, it becomes extremely high temperature and needs to be cooled.
- the starch derivative according to the present invention is further obtained by introducing 0.01 to 5% by weight of S or N into a hydroxyl group of such a starch in terms of S or N.
- the zirconium-containing group may be an acid sulfite such as sodium acid sulfite or potassium acid sulfite.
- the nitrogen-containing groups include hydrazine, methyl hydrazine, and methyl hydrazine.
- Hydrogen derivatives such as hydrazine, ammonia, hydroxyamine, methylamine, cyclohexylamine, ethylethanol ' ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- the ratio of these di- or nitrogen-containing groups may be from 0.01 to 5% by weight, preferably from 0.5 to 3% by weight, of the starch derivative obtained by S or N conversion. It is preferably 1 to 3.% by weight. If the content of the zeolite or nitrogen-containing group is out of the above range, the consumption of P alkalinity increases during use, which is not preferable. There is no particular limitation on the method for introducing the above-mentioned iodinated or nitrogen-containing group into the hydroxyl group of the starch, and an ordinary synthesis reaction of a processed starch is appropriately used.
- a starch is mixed with a zeolite or a nitrogen-containing compound, that is, a compound capable of introducing a zeolite or a nitrogen-containing group into a starch, and the mixture is mixed at room temperature to about 59 ° C. Stir for 5 to 72 hours.
- a zeolite or a nitrogen-containing compound that is, a compound capable of introducing a zeolite or a nitrogen-containing group into a starch
- reaction product contains a partially unreacted raw material compound, which can be used as it is.
- product after purifying it by an ordinary method.
- the oxygen absorber for boilers of the present invention can contain such a starch derivative in an amount of 1 to 100% by weight. .
- the oxygen scavenger for boiler of the present invention as a PH adjusting agents or softeners, N a 0 H, N a 2 C 0 3, metal salt of-phosphate, for example-phosphate 3 Na
- a PH adjusting agents or softeners N a 0 H, N a 2 C 0 3, metal salt of-phosphate, for example-phosphate 3 Na
- other drugs such as um, tricalcium phosphate, sodium hexametharate, phosphoric acid, sulfuric acid, ammonia, hydrazine, etc. May be. It may be used in combination with these drugs at the time of use. In this case, the use ratio is not particularly limited, and the above-mentioned drug can be used in a wide range of 1 to 99% by weight based on the starch derivative.
- the above-mentioned starch is used.
- the ice-melt solution dissolved so that the concentration of the derivative becomes 0.01 to 50% by weight is added to the target water system such as makeup water using a quantitative pump.
- the amount of addition should be an amount that eliminates dissolved enzymes in the make-up water. The amount to be added can be determined by a simple test.
- the same processing as in Reference Example 1 was carried out except that the temperature was kept at 90 ° C for 180 minutes.
- the cold water soluble starch obtained has a DE of 23.0% and
- the cold water soluble starch obtained in Reference Example 1 was mixed with 0.16 parts by weight of NaHS03 to react.
- the S-atomic content of the product starch was 0.05%.
- the cold water-soluble starch obtained in Reference Example 1 was treated in the same manner as in Example 3 except that 10 parts by weight of a 60% aqueous solution of hydrazine was used.
- the ⁇ -atom content of the resulting starch was 1.94%.
- Example 5 100 parts by weight of the cold-water-soluble starch obtained in Reference Example 1 was dissolved in 92 parts by weight of water, and Na0H2.9 parts and getyl aminoethyl chloride hydrochloride 5.0 parts. Nine parts by weight were added and reacted at 45 ° C for 3 hours. The N-atom content of the obtained product starch was 0.43%.
- Example 4 The same treatment as in Example 4 was performed except that 0.3% by weight of a 60% aqueous hydrazine solution was used. The N-atom content of the obtained product starch was 0.05%.
- Example 6 The same treatment as in Example 6 was carried out except that 0.05% by weight of a 60% aqueous hydrazine solution was used. The N-atom content of the obtained product starch was 0.01%.
- Example 10 The cold water soluble starch obtained in Reference Example 2 was mixed with 2.6.7 parts by weight of NaHS0a and reacted. The S-atom content of the obtained product starch was 0.82%.
- Example 10 The cold water soluble starch obtained in Reference Example 2 was mixed with 2.6.7 parts by weight of NaHS0a and reacted. The S-atom content of the obtained product starch was 0.82%.
- the cold water-soluble starch obtained in Reference Example 3 was treated in the same manner as in Example 9 except that 14 parts by weight of a 60% aqueous solution of hydrazine was used.
- the N-atom content of the obtained product starch was 2.8%. .
- a 6 pound capacity, continuous water supply type autoclave (steam generator (10% blower)) is maintained at a pressure of 10 kgcm 2 , with a feed rate of 13 £ Zhr and Water quality soft water was supplied.
- the chemicals of Examples 1 to 7 were added to the water supply pipe by using a fixed-quantity pump at 3 O mg Z £, respectively, and the boiler water was concentrated 10 times.
- the pH was set to 11.3.
- Steam was sampled from the pipe immediately after the steam outlet, and the amount of dissolved oxygen in the steam was measured using a dissolved oxygen electrode. ..
- the degree of P-alkali in the can water was measured.
- the measurement conditions were as follows: temperature: 175-L80. C, pressure IQ kg Z cm 2 .
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002046878A CA2046878C (en) | 1989-12-20 | 1990-12-11 | Oxygen scavenger for a boiler water system and a method of removing dissolved oxygen in a boiler water system |
EP91900367A EP0458981B1 (en) | 1989-12-20 | 1990-12-11 | Deoxidizer for boiler and method of removing dissolved oxygen from boiler water |
DE69028297T DE69028297T2 (de) | 1989-12-20 | 1990-12-11 | Desoxidationsmittel für kessel und verfahren zum entfernen von gelöstem sauerstoff aus kesselwasser |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1/330380 | 1989-12-20 | ||
JP1330380A JPH03191076A (ja) | 1989-12-20 | 1989-12-20 | ボイラ用脱酸素剤 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991009154A1 true WO1991009154A1 (fr) | 1991-06-27 |
Family
ID=18231956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1990/001609 WO1991009154A1 (fr) | 1989-12-20 | 1990-12-11 | Desoxydant pour chaudiere et procede d'extraction de l'oxygene dissous dans l'eau d'une chaudiere |
Country Status (7)
Country | Link |
---|---|
US (1) | US5264179A (ja) |
EP (1) | EP0458981B1 (ja) |
JP (1) | JPH03191076A (ja) |
KR (1) | KR0154113B1 (ja) |
CA (1) | CA2046878C (ja) |
DE (1) | DE69028297T2 (ja) |
WO (1) | WO1991009154A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3172744B2 (ja) * | 1992-12-25 | 2001-06-04 | 栗田工業株式会社 | ボイラ用薬剤 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56133470A (en) * | 1980-03-21 | 1981-10-19 | Katayama Chem Works Co Ltd | Corrosion preventing method for metals in system using calcium chloride brine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3562103A (en) * | 1967-12-28 | 1971-02-09 | Staley Mfg Co A E | Process of making paper containing quaternary ammonium starch ethers containing anionic covalent phosphorus and paper made therefrom |
JPS5426250A (en) * | 1977-07-30 | 1979-02-27 | Osaka Eyazooru Kougiyou Kk | Rusttpreventing method for waterrcontaining airsol products made of metal container |
JPS54118390A (en) * | 1978-03-08 | 1979-09-13 | Hitachi Ltd | Ozone removing solution |
JPS56133469A (en) * | 1980-03-21 | 1981-10-19 | Katayama Chem Works Co Ltd | Corrosion preventing method for metals in system using calcium chloride brine |
JPS577225A (en) * | 1980-06-13 | 1982-01-14 | Katayama Chem Works Co Ltd | Stable aqueous deoxigenating agent |
US4464528A (en) * | 1982-12-16 | 1984-08-07 | The Dow Chemical Company | Process for making cationic starch |
JPS6153375A (ja) * | 1984-08-22 | 1986-03-17 | Mitsubishi Gas Chem Co Inc | 澱粉のりの製法 |
JPH0285383A (ja) * | 1988-09-21 | 1990-03-26 | Kurita Water Ind Ltd | ボイラ薬剤 |
-
1989
- 1989-12-20 JP JP1330380A patent/JPH03191076A/ja active Granted
-
1990
- 1990-12-11 CA CA002046878A patent/CA2046878C/en not_active Expired - Fee Related
- 1990-12-11 WO PCT/JP1990/001609 patent/WO1991009154A1/ja active IP Right Grant
- 1990-12-11 US US07/743,348 patent/US5264179A/en not_active Expired - Fee Related
- 1990-12-11 KR KR1019910700933A patent/KR0154113B1/ko not_active IP Right Cessation
- 1990-12-11 EP EP91900367A patent/EP0458981B1/en not_active Expired - Lifetime
- 1990-12-11 DE DE69028297T patent/DE69028297T2/de not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56133470A (en) * | 1980-03-21 | 1981-10-19 | Katayama Chem Works Co Ltd | Corrosion preventing method for metals in system using calcium chloride brine |
Also Published As
Publication number | Publication date |
---|---|
KR920701522A (ko) | 1992-08-11 |
CA2046878C (en) | 2000-07-25 |
US5264179A (en) | 1993-11-23 |
KR0154113B1 (ko) | 1998-11-16 |
EP0458981A1 (en) | 1991-12-04 |
EP0458981B1 (en) | 1996-08-28 |
DE69028297T2 (de) | 1997-03-06 |
EP0458981A4 (en) | 1993-02-03 |
JPH03191076A (ja) | 1991-08-21 |
CA2046878A1 (en) | 1991-06-21 |
JPH0512435B2 (ja) | 1993-02-18 |
DE69028297D1 (de) | 1996-10-02 |
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