WO2013126683A1 - Réduction d'un dépôt d'aluminosilicate dans le procédé bayer - Google Patents

Réduction d'un dépôt d'aluminosilicate dans le procédé bayer Download PDF

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Publication number
WO2013126683A1
WO2013126683A1 PCT/US2013/027299 US2013027299W WO2013126683A1 WO 2013126683 A1 WO2013126683 A1 WO 2013126683A1 US 2013027299 W US2013027299 W US 2013027299W WO 2013126683 A1 WO2013126683 A1 WO 2013126683A1
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Prior art keywords
component
small molecule
group
bayer process
scale
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PCT/US2013/027299
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English (en)
Inventor
Everett C. Phillips
Timothy La
Kailas B. Sawant
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Nalco Company
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Priority claimed from US13/403,282 external-priority patent/US9487408B2/en
Application filed by Nalco Company filed Critical Nalco Company
Priority to BR112014016795-8A priority Critical patent/BR112014016795B1/pt
Priority to AU2013222328A priority patent/AU2013222328B2/en
Priority to CA2860803A priority patent/CA2860803C/fr
Publication of WO2013126683A1 publication Critical patent/WO2013126683A1/fr
Priority to AU2017248578A priority patent/AU2017248578B2/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/0834—Compounds having one or more O-Si linkage
    • C07F7/0836—Compounds with one or more Si-OH or Si-O-metal linkage
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
    • C07F7/1804—Compounds having Si-O-C linkages

Definitions

  • This invention relates to compositions of matter and methods of using them to treat scale in various industrial process streams, in particular certain silane based small molecules that have been found to be particularly effective in treating aluminosilicate scale in a Bayer process stream.
  • the Bayer process is used to manufacture alumina from Bauxite ore.
  • the process uses caustic solution to extract soluble alumina values from the bauxite. After dissolution of the alumina values from the bauxite and removal of insoluble waste material from the process stream the soluble alumina is precipitated as solid alumina trihydrate. The remaining caustic solution known as "liquor” and/or “spent liquor” is then recycled back to earlier stages in the process and is used to treat fresh bauxite. It thus forms a fluid circuit. For purposes of this application, this description defines the term "liquor.” The recycling of liquor within the fluid circuit however has its own complexities.
  • Bauxite often contains silica in various forms and amounts. Some of the silica is unreactive so it does not dissolve and remains as solid material within the Bayer circuit. Other forms of silica (for example clays) are reactive and dissolve in caustic when added into Bayer process liquors, thus increasing the silica concentration in the liquor. As liquor flows repeatedly through the circuit of the Bayer process, the concentration of silica in the liquor further increases, eventually to a point where it reacts with aluminum and soda to form insoluble aluminosilicate particles. Aluminosilicate solid is observed in at least two forms, sodalite and cancrinite. These and other forms of aluminosilicate are commonly referred to, and for the purposes of this application define, the terms "desilication product" or "DSP.”
  • DSP can have a formula of 3(Na 2 O Al 2 0 3 -2Si0 2 -2 H 2 0) ⁇ 2NaX where X represents
  • DSP has an inverse solubility (precipitation increases at higher temperatures) and it can precipitate as fine scales of hard insoluble crystalline solids, its accumulation in Bayer process equipment is problematic. As DSP accumulates in Bayer process pipes, vessels, heat transfer equipment, and other process equipment, it forms flow bottlenecks and obstructions and can adversely affect liquor throughput. In addition because of its thermal conductivity properties, DSP scale on heat exchanger surfaces reduce the efficiency of heat exchangers.
  • Bayer process operators manage the buildup of silica concentration in the liquor is to deliberately precipitate DSP as free crystals rather than as scale.
  • a "desilication" step in the Bayer process is used to reduce the concentration of silica in solution by precipitation of silica as DSP, as a free precipitate. While such desilication reduces the overall silica concentration within the liquor, total elimination of all silica from solution is impractical and changing process conditions within various parts of the circuit (for example within heat exchangers) can lead to changes in the solubility of DSP, resulting in consequent precipitation as scale.
  • At least one embodiment is directed towards a method of reducing DSP in a Bayer process comprising the step of adding to the Bayer process stream an aluminosilicate scale inhibiting amount of a mixture of products as defined above.
  • Polymer means a chemical compound comprising essentially repeating structural units each containing two or more atoms. While many polymers have large molecular weights of greater than 500, some polymers such as polyethylene can have molecular weights of less than 500. Polymer includes copolymers and homo polymers.
  • Small molecule means a chemical compound comprising essentially non-repeating structural units. Because an oligomer (with more than 10 repeating units) and a polymer are essentially comprised of repeating structural units, they are not small molecules. Small molecules can have molecular weights above and below 500. The terms “small molecule” and “polymer” are mutually exclusive.
  • foulant means a material deposit that accumulates on equipment during the operation of a manufacturing and/or chemical process which may be unwanted and which may impair the cost and/or efficiency of the process.
  • DSP is a type of foulant.
  • Amin means a molecule containing one or more nitrogen atoms and having at least one secondary amine or primary amine group.
  • monoamines such as dodecylamine, diamines such as hexanediamine, triamines such as diethylene triamine, and tetraethylene pentamine are all amines, as well as hexamine diamine.
  • Alkyloxy means having the structure of OX where X is a hydrocarbon and O is oxygen.
  • the oxygen is bonded both to the X group as well as to a silicon atom of the small molecule.
  • the alkyloxy group consists of a methyl group bonded to the oxygen atom.
  • the alkyloxy group consists of an ethyl group bonded to the oxygen atom.
  • the alkyloxy group consists of a propyl group bonded to the oxygen atom.
  • the alkyloxy group consists of a butyl group bonded to the oxygen atom.
  • X is C 5
  • the alkyloxy group consists of a pentyl group bonded to the oxygen atom.
  • X is C 6 the alkyloxy group consists of a hexyl group bonded to the oxygen atom.
  • “Monoalkyloxy” means that attached to a silicon atom is one alkyloxy group.
  • Dialkyloxy means that attached to a silicon atom are two alkyloxy groups.
  • Trialkyloxy means that attached to a silicon atom are three alkyloxy groups.
  • Synthetic Liquor or “Synthetic Spent Liquor” is a laboratory created liquid used for experimentation whose composition in respect to alumina, soda, and caustic corresponds with the liquor produced by recycling through the Bayer process.
  • Bayer Liquor is actual liquor that has run through a Bayer process in an industrial facility.
  • Alkylamine means entities where hydrogen bonds of ammonia are substituted with alkyl groups.
  • Alkylene means an unsaturated, aliphatic hydrocarbon with one or more carbon- carbon double bonds.
  • bauxite ore passes through a grinding stage and alumina, together with some impurities including silica, are dissolved in added liquor.
  • the mixture then typically passes through a desilication stage where silica is deliberately precipitated as DSP to reduce the amount of silica in solution.
  • the slurry is passed on to a digestion stage where any remaining reactive silica dissolves, thus again increasing the concentration of silica in solution which may subsequently form more DSP as the process temperature increases.
  • the liquor is later separated from undissolved solids, and alumina is recovered by precipitation as gibbsite.
  • the spent liquor completes its circuit as it passes through a heat exchanger and back into the grinding stage.
  • DSP scale accumulates throughout the Bayer process but particularly at the digestion stage and most particularly at or near the heat exchanger, where the recycled liquor passes through.
  • an effective concentration of a silane-based small molecule product is added to some point or stage in the liquor circuit of the Bayer process, which minimizes or prevents the accumulation of DSP on vessels or equipment along the liquor circuit.
  • the small molecule comprises the reaction product between an amine and at least one amine-reactive silane
  • the silicon of the silane can be monoalkyloxy, dialkyloxy, trialkyloxy or trihydroxy.
  • aluminosilicate scale inhibiting amount of a composition comprising at least one small molecule, the at least one small molecule comprising of at least three components, one being an Ri component, one being an R 2 component and one being an R 3 component, the components within the small molecule arranged according to the general formula: wherein the small molecule may be at least one of: carbonates, bicarbonates, carbamates, ureas, amides and salts thereof and:
  • Ri is selected from the group consisting of: H, alkyl, amine, alkylamine, structure (A) and structure (B);
  • R 2 is independently selected from the group consisting of: H, alkyl, amine, alkylamine, G and E,
  • G being one item selected from the group consisting of: 3- glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltrialkoxysilane, 3- glycidoxypropylalkyldialkoxysilane,3-glycidoxypropyldialkylmonoalkoxysilane, 3- isocyanatopropyltrialkoxysilane, 3-isocyanatopropylalkyldialkoxysilane, 3- isocyanatopropyldialkylmonoalkoxysilane, 3-chloropropyltrialkoxysilane, 3- chloropropylalkyldialkoxysilane, and 3-chloropropyldialkylmonoalkoxysilane;
  • E being 2-ethylhexyl glycidyl ether, n-butyl glycidyl ether, t-butyl glycidyl ether, C 3 -C 22 glycidyl ether, C 3 -C 22 isocyanate, C 3 -C 22 chloride, C 3 -C 22 bromide, C 3 -C 22 iodide, C 3 -C 22 sulfate ester, C 3 -C 22 phenolglycidyl ether, and any combination thereof,
  • R 3 is independently selected from the group consisting of: H, alkyl, aminealkylamine, G and E and
  • n is an integer from 2 to 6.
  • the Ri is independently selected from the group consisting of: monoisopropanol amine, ethylene diamine, diethylene triamine, tetraethylene pentamine, isophoronediamine, xylenediamine, bis(aminomethyl)cyclohexane, hexanediamine, C,C,C- trimethylhexanediamine, methylene bis(aminocyclohexane), saturated fatty amines, unsaturated fatty amines such as oleylamine and soyamine, N-fatty-l,3-propanediamine such as
  • cocoalkylpropanediamine cocoalkylpropanediamine, oleylpropanediamine, dodecylpropanediamine, hydrogenized tallow alkylpropanediamine, and tallow alkylpropanediamine and any combination thereof.
  • the small molecule is selected from the group consisting of: (X) (XI), (XII), (XIII), (XIV), (XV), (XVI), (XVII), (XVIII), and (XIX):
  • the small molecule is selected from the group consisting of: (XX), (XXI), and (XXII):
  • the small molecule is selected from the group consisting of: (XXIII), (XXIV), (XXV), (XXVI), (XXVII), (XVIII), and (XIX):
  • the small molecule is selected from the group consisting of: (XXVIII), (XXIX), (XXX), (XXXI), (XXXII) and combinations thereof:
  • the small molecule is selected from the group consisting of: (XXXIII), (XXXIV), (XXXV), (XXXVI), (XXXVII), (XXXVIII), (XXXIX), (XL), (XLI), and (XLII):
  • the small molecule is selected from the group consisting of: (XLIII), (XLIV), (XLV), (XLVI), (XLVII), (XLVIII), (XLIX), (L), (LI), and (LII):
  • the small molecule is selected from the group consisting of: (LIII), (LIV), and (LV):
  • the small molecule is selected from the group consisting of: (LVI), (LVII), (LVIII), (LIX), (LX), (LI), and (LII):
  • the small molecule is selected from the group consisting of: (LXI), (LXII), (LXIII), (LXIV) and (LXV):
  • the small molecule is selected from the group consisting of: (LXVI), (LXVII), (LXVIII), (LXIX), (LXX) and (LXXI):
  • the small molecule is selected from the group consisting of: (LXXII), (LXXIII), (LXXIV) and (LXXV):
  • the small molecule is selected from the group consisting of: (LXXVI), (LXXVII), (LXXVIII) and (LXXIX):
  • the small molecule is selected from the group consisting of: (LXXX), (LXXXI), (LXXXII) and (LXXXIII):
  • the small molecule is selected from the group consisting of: (LXXXIV), (LXXXV), (LXXXVI) and (LXXXVII):
  • the small molecule is selected from the group consisting of: (LXXXVIII), (LXXXIX) and (XC):
  • the small molecule is selected from the group consisting of: (XCI), (XCII), (XCIII), (XCIV) and (XCV):
  • the small molecule is selected from the group consisting of: (XCVI), (XCVII) and (XCVIII):
  • the small molecule is selected from the group consisting of: (XCIX), (C), (CI) and (CII):
  • the small molecule is selected from the group consisting of: (CIII), (CIV), (CV) and (CVI):
  • the small molecule is selected from the group consisting of: (CVII), (CVIII), (CIX) and (CX):
  • the small molecule is selected from the group consisting of: (CXI), (CXII), (CXIII) and (CXIV):
  • the small molecule is selected from the group consisting of: (CXV), (CXVI) and (CXVII):
  • the small molecule is selected from the group consisting of: (CXVIII), (CXIX), (CXX) , (CXXI) and (CXXII):
  • the small molecule is selected from the group consisting of: (CXXIII), (CXXIV) and (CXXV):
  • the small molecule is selected from the group consisting of: (CXXVI), (CXXVII), (CXXVIII) and (CXXIX):
  • the small molecule is selected from the group consisting of: (CXXX), (CXXXI), (CXXXII) and (CXXXIII):
  • the small molecule is selected from the group consisting of: (CXXXIV), (CXXXV), (CXXXVI) and (CXXXVII):
  • the small molecule is selected from the group consisting of: (CXXXVIII), (CXXXIX), (CXL) and (CXLI):
  • the small molecule is selected from the group consisting of: (CXLII), (CXLIII) and (CXLIV):
  • the small molecule is selected from the group consisting of: (CXLV), (CXLVI), (CXLVII) and (CXLVIII):
  • the small molecule is selected from the group consisting of: (CXLIX), (CL), (CLI) and (CLII):
  • the small molecule is selected from the group consisting of: (CLIIII), (CLIV), (CLV) and (CLVI):
  • the small molecule is selected from the group consisting of: (CLVII), (CLVIII), (CLIX) and (CLX):
  • the small molecule is selected from the group consisting of: (CLXI), (CLXII), and (CLXIII):
  • the small molecule is present in a solution in an amount ranging from about 0.01 to about 100 wt%.
  • the composition may further comprise one item selected from the list consisting of: amines, activators, antifoaming agents, co-absorbents, corrosion inhibitors, coloring agents, and any combination thereof.
  • the composition may comprise a solvent, the solvent is selected from the group consisting of: water, alcohols, polyols, other industrial solvents, organic solvents, and any combination thereof.
  • the components may be isolated from the reaction in the form of a solid, precipitate, salt and/or crystalline material in pH's ranging from 0 to 14.
  • Max HT Sodalite Scale Inhibitor Plant Experience and Impact on the Process, by Donald Spitzer et. al., Page 57, Light Metals 2008, (2008).
  • a first advantage is that the smaller molecular weight of the product means that there are a larger number of active, inhibiting moieties available around the DSP seed crystal sites at the DSP formation stage.
  • a second advantage is that the lower molecular weight allows for an increased rate of diffusion of the inhibitor, which in turn favors fast attachment of the inhibitor molecules onto DSP seed crystals.
  • a third advantage is that the lower molecular weight avoids high product viscosity and so makes handling and injection into the Bayer process stream more convenient and effective.
  • the invention further relates to the synthesis of new small molecule chemical entities that show surprisingly improved performance for the inhibition of DSP scale in Bayer liquor compared to those previously disclosed.
  • the extension of the diamine structure by increasing the number of reactive nitrogen groups to between 3 to 5 with spacing by one, two or three alkylene groups ⁇ e.g., ethylene or propylene) as indicated by the general structure below, has resulted in remarkably improved rates of adsorption of the inhibitor onto DSP seed surfaces as well as DSP scale inhibition performance over earlier compositions, for example those based on hexane diamine, ethylene diamine and l-amino-2-propanol.
  • N ⁇ -aminoethy ⁇ ethane-l ⁇ -diamine commonly known as diethylenetriamine, (DETA)
  • N ⁇ Q-aminopropy ⁇ propane-l ⁇ -diamine commonly known as
  • TEPA tetraethylenepentamine
  • the preferred synthesis for the formation of these new A:G:E chemical entities involves the reaction of the amine with component G first (in an amount ranging between 1.0-2.5 mole ratio to amine) followed by the reaction with component E (in an amount ranging between 0.5- 2.0 mole ratio to amine) in a semi-batch method.
  • a preferred A:G:E compositions range, in general, having mole ratios of between:
  • the A:G:E complexes or adducts have low molecular weights ( ⁇ 1000 g/mole) compared to the silane substituted highly polymeric structures based on polyacrylate acrylamide copolymers or polyethyleninimine polymers disclosed in the prior art, and, more specifically including the chemistries disclosed as examples in the Cytec patent application WO/045677 Al involving silane substituted polyamines or amine mixtures that have been extensively cross-linked using epichlorohydrin.
  • the small molecule silane containing A:G:E complexes (or adducts) have a unique structure compared to the 0.5 mole % silane substituted polymers disclosed in the prior art.
  • the preferred order of addition of the component G followed by the component E leads to a more preferred spatial arrangement or distribution of the silane group with respect to the more hydrophobic E group in the small molecule, compared to a totally random distribution of G and E that would be anticipated from in a true batch reaction.
  • these small molecules can be isolated as the unhydrolized alkoxysilane, protected with methyl or ethyl ether groups. These compounds can be sold and transported to the customer site as a dry granular product instead of as a caustic solution (liquid). This can provide the following benefits over exiting scale inhibitors:
  • These compounds can be hydrolyized on-site at a 0.01-50 % concentration, more preferably between 0.01 - 25 % and most preferably between 0.1 - 10 % concentration in a caustic solution containing between 5-100 gpL sodium hydroxide and more preferably between 5 - 50 g/L and most preferably in a caustic solution containing between 5-25 gpL sodium hydroxide, or they can be hydrolyzed directly in-situ in the Bayer process, in either case, hydrolysis of the alkyl ether on the silane occurs to form the - corresponding hydroxysilane compound(s) with -Si-(OH) 3 groups which are readily soluble in the caustic and Bayer solutions.
  • a further improvement in scale inhibition performance is achieved using A:G:E compositions synthesized as described above and further treating the resulting mixture of compounds with a very small amount of an di-oxirane coupling agent, available from CVC Thermoset Specialties, having a general structure of:
  • Ethylene glycol di glycidyl ether (EGDGE)
  • compositions range, in general, having mole ratios of between:
  • R independently represents H, alkyl, alkylamine, inorganic and organic species such as salts, ethers, anhydrides etc. in the possible mixture of small molecules that are formed in these reactions.
  • these small molecules can be isolated as the unhydrolized alkoxysilane, protected with methyl or ethyl ether groups. These compounds can be sold and transported to the customer site as a dry granular product instead of as a caustic liquid solution. This can provide the following benefits over exiting scale inhibitors:
  • These compounds can be hydrolyzed on-site at a 0.01-50.0% concentration, more preferably between 0.01 - 25 % and most preferably between 0.1 - 10% concentration in a caustic solution containing between 5-100 gpL sodium hydroxide and more preferably between 5 - 50 g/L and most preferably in a caustic solution containing between 5-25 g/L sodium hydroxide , or they can be hydrolyzed directly in-situ in the Bayer process, in either case, hydrolysis of the alkyl ether on the silane occurs to form the now soluble hydroxysilane compound(s) with -Si-(OH) 3 groups.
  • A e.g., hexane diamine
  • G e.g. 3- glycidoxypropyltrimethoxysilane
  • E e.g. ethyl hexyl glycidyl ether
  • A e.g., hexane diamine
  • G e.g. 3- glycidoxypropyltrimethoxysilane
  • E e.g. ethyl hexyl glycidyl ether
  • the reaction becomes self-sustaining and depending on the scale of the reaction, can reach temperatures as high as 125 to 180 C.
  • the reaction is complete after 1 to 2 hours and then the mixture is allowed to cool down.
  • this un-hydrolyzed product mixture can be isolated as a liquid or gel or a solid in a suitable manner.
  • the reaction product mixture can be hydrolyzed, via a number of methods, to prepare a solution of the hydrolyzed product mixture in water.
  • the hydrolysis of the alkoxysilane groups in the component G results in the formation of the corresponding alcohol (e.g methanol, ethanol etc., depending on the akloxysilane used in the synthesis).
  • At least one embodiment involves the use of a continuous or semi-batch synthesis method which provides several advantages over the batch process commonly used.
  • Use of a semi-batch process or continuous or separate or slow sequential or individual or combined feed of the E and G epoxides into the reaction mixture allows better control of the reaction temperature thereby reducing the amount of methanol that is generated and isolated during the reaction. Furthermore the reaction mixture has a lower viscosity and accounts for fewer undesired side reactions (see Table 1).
  • a small amount of sodium silicate (0.25 - 1.5 g/L as Si0 2 ) is added to a Bayer refinery spent liquor at room temperature to raise the silica concentration in the liquor.
  • Table 2 shows the relative DSP Scale Inhibition for several A:G:E synthesized mixtures using the synthesis reaction disclosed earlier, with various amine constituents as the core.
  • Table 4 shows the % decrease in net DSP scale for the 1.0 : 2.0 : 0.8 mole ratio TEPA:G:E chemistry (sample C) and corresponding coupled adduct with 0.25 mole ratio EGDGE (sample D) and over the 1.0 : 1.0 : 0.8 mole ratio HDA:G:E C compositions (sample 1) disclosed previously.
  • Table 5 shows how the adsorption rate of the new 1.0:2.0:0.8 mole ratio TEPA:G:E composition (sample C) applied at a constant dose over various contact times with DSP seed crystals is significantly faster than that found for the previously disclosed 1.0:1.0:0.8 mole ratio
  • HMDA:G:E scale inhibitor
  • Table 6 shows the continuous reduction in net DSP scale formation as a function of the dosage applied of the small molecule sample C from 0 to 80 ppm as product. Complete scale inhibition was found at dosages above 80 ppm.
  • Table 4 provided some data for the improved performance of the coupled adduct sample D over sample C.
  • Table 7 shows how the performance for the coupled adducts, as given in Table 3, having 1 to 2 mole ratio of alkoxysilane groups (G) provides better scale inhibition than the uncoupled TEPA:G:E chemistries and 1.0:1.0:0.8 HMDA:G:E
  • the results from Table 7 indicate that the preferred composition is 2 moles equivalents of alkoxysilane groups G based on the amine compared to 1 mole equivalent of alkoxysilane group G for either the uncoupled or coupled small molecules, for example compare the results for sample C with sample A and sample D with sample B.
  • alkoxysilane groups G to greater than two, e.g., three, mole equivalents does not lead to a further enhancement in the DSP scale inhibition performance in contrast to what might be expected. In fact the addition of three equivalents leads to a lower performance than for compounds with only one equivalent of alkoxysilane group G.
  • Table 8 shows that the new 1.0:2.0:0.8:0.25 mole ratio TEPA:G:E:EGDGE composition (sample D) adsorbs significantly faster to the surface of a DSP seed crystal compared to the 1.0:1.0:0.8 mole ratio HDA:G:E) composition (sample 1).
  • Table 9 shows the continuous reduction and complete elimination of DSP scale formation as a function of the applied dosage of the sample D from 0 to 80 ppm as product. Further supporting the improvement over the uncoupled composition complete scale inhibition was found at dosages between 50-60 ppm compared to 80 ppm for sample C (see Table 4).
  • Tables 10 and 11 provided additional examples of improved performance of the coupled A:G:E adducts over uncoupled A:G:E compositions, for example compare the results for samples E, F, H and J against the corresponding uncoupled samples C, I, G, and sample 1 (from table 3).

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Abstract

L'invention concerne un procédé d'inhibition de l'accumulation de dépôt de DSP dans le circuit de liqueur d'un équipement du procédé Bayer. Le procédé comprend l'addition d'une ou plusieurs petites molécules à base de silane particulaire au circuit de fluide de liqueur. Ces inhibiteurs de dépôt réduisent la formation de dépôt de DSP et par là augmentent le débit de fluide de sortie, augmentent le laps de temps pendant lequel l'équipement du procédé Bayer peut être opérationnel et réduisent le besoin de lavages acides coûteux et dangereux de l'équipement du procédé Bayer. Par conséquent, l'invention permet une réduction significative du coût total du fonctionnement d'un procédé Bayer.
PCT/US2013/027299 2012-02-23 2013-02-22 Réduction d'un dépôt d'aluminosilicate dans le procédé bayer WO2013126683A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR112014016795-8A BR112014016795B1 (pt) 2012-02-23 2013-02-22 método para redução de incrustação contendo aliminosilicato em um processo bayer
AU2013222328A AU2013222328B2 (en) 2012-02-23 2013-02-22 Reducing aluminosilicate scale in the Bayer process
CA2860803A CA2860803C (fr) 2012-02-23 2013-02-22 Reduction d'un depot d'aluminosilicate dans le procede bayer
AU2017248578A AU2017248578B2 (en) 2012-02-23 2017-10-23 Reducing aluminosilicate scale in the Bayer process

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US13/403,282 2012-02-23
US13/403,282 US9487408B2 (en) 2009-09-25 2012-02-23 Reducing aluminosilicate scale in the bayer process

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015100196A1 (fr) 2013-12-24 2015-07-02 Cytec Industries Inc. Procédé de réduction de la calamine dans le procédé bayer
US10190003B2 (en) 2014-10-21 2019-01-29 Cytec Industries Inc. Degradation-resistant scale inhibitors
WO2023148365A1 (fr) * 2022-02-07 2023-08-10 Its Water Group Sa Composition pour réduire la quantité de dépôts d'hydroaluminosilicate de sodium et méthode d'obtention de la composition

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US5314626A (en) * 1991-12-23 1994-05-24 Nalco Chemical Company Method for the alteration of siliceous materials from Bayer process liquids
WO2000076922A2 (fr) * 1999-06-16 2000-12-21 Hercules Incorporated Procedes empechant le tartre de se deposer au moyen de compositions inorganiques et compositions appropriees
US6309615B1 (en) * 1996-11-20 2001-10-30 Comalco Aluminum Limited Process for removing reactive silica from a bayer process feedstock
US20040011744A1 (en) * 2002-07-22 2004-01-22 Spitzer Donald P. Method of preventing or reducing aluminosilicate scale in a bayer process

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BR112014016795A8 (pt) 2017-07-04
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CA2860803A1 (fr) 2013-08-29
AU2017248578A1 (en) 2017-11-09
AU2013222328B2 (en) 2017-11-09
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BR112014016795A2 (pt) 2017-06-13
AU2013222328A1 (en) 2014-07-10

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