EP1068279A1 - PROCEDE PERMETTANT D'AUGMENTER LE pH DANS LES SOLS ACIDES - Google Patents

PROCEDE PERMETTANT D'AUGMENTER LE pH DANS LES SOLS ACIDES

Info

Publication number
EP1068279A1
EP1068279A1 EP99915700A EP99915700A EP1068279A1 EP 1068279 A1 EP1068279 A1 EP 1068279A1 EP 99915700 A EP99915700 A EP 99915700A EP 99915700 A EP99915700 A EP 99915700A EP 1068279 A1 EP1068279 A1 EP 1068279A1
Authority
EP
European Patent Office
Prior art keywords
meth
poly
acrylates
soil
acidic
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.)
Withdrawn
Application number
EP99915700A
Other languages
German (de)
English (en)
Inventor
Aloys HÜTTERMANN
Moitoba Zomorrodi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stockhausen GmbH and Co KG
Original Assignee
Stockhausen GmbH and Co KG
Chemische Fabrik Stockhausen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stockhausen GmbH and Co KG, Chemische Fabrik Stockhausen GmbH filed Critical Stockhausen GmbH and Co KG
Publication of EP1068279A1 publication Critical patent/EP1068279A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • C09K17/16—Soil-conditioning materials or soil-stabilising materials containing organic compounds only applied in a physical form other than a solution or a grout, e.g. as platelets or granules
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • C09K17/18—Prepolymers; Macromolecular compounds
    • C09K17/20—Vinyl polymers
    • C09K17/22—Polyacrylates; Polymethacrylates

Definitions

  • the present invention relates to a method for increasing the pH in acidic soils, in particular in soils with a pH in the aluminum buffer range, that is to say less than 5 than 4.2.
  • the aluminum buffer range is the pH range in which at higher pH values than oxide resp. Hydroxide, i.e. Non-ionic aluminum, which comes from the weathering of the clay minerals, changes into cationic solution.
  • Soil slurries in pure water have a pH about 0.6 units higher than a slurry in CaCl 2 solution. This is due to the fact that in such soils the exchange sites at the clay-humus complex are mostly occupied with protons and cationic acids and the pH of the
  • Soil solution sets only very slowly, ie, the balance between the clay-humus complexes of the soil and the soil solution takes place very slowly (see: "Soil Ecology", Georg Thieme Verlag Stuttgart 1997, p. 125). Becomes one Soil slurry KC1 or CaCl 2 added, the counterions on the exchange complex are released immediately and the pH value is reduced accordingly.
  • the acidic soils are treated with the crosslinked poly (meth) acrylates, e.g. B. by
  • the bottom is excavated to a depth of approximately 50 cm, preferably 30 cm and in particular approximately 40 cm, and mixed with the poly (meth) acrylates.
  • Suitable poly (meth) acrylates to be used according to the invention are all crosslinked, carboxylate-containing poly (meth) acrylates which form hydrogels.
  • carboxylate-containing poly (meth) acrylates particularly suitable as the carboxylate-containing poly (meth) acrylates to be used according to the invention are those which are primarily and preferably composed of the monomers acrylic acid, acrylamide, methacrylic acid and methacrylamide, but also other water-soluble monomers, such as acrylonitrile, methacrylonitrile, N, N -Dimethylacrylamide,
  • Vinylpyridine and other water-soluble polymerizable acids and their salts in particular maleic, fumaric, itaconic, vinylsulfonic or acrylamidomethylpropanesulfonic acid; also hydroxyl-containing esters of polymerizable acids, especially the hydroxyethyl and hydroxypropyl esters of acrylic and methacrylic acid; further amino group-containing and ammonium group-containing esters and amides of polymerizable acids such as the dialkylamino esters, in particular the dimethyl and diethylamino alkyl esters of acrylic and methacrylic acid, and also the trimethyl and trimethyl ammonium alkyl esters and the corresponding amides.
  • the poly (meth) acrylates to be used according to the invention can
  • REPLACEMENT BUTT (RULE 26) to be formed exclusively from the abovementioned monomers containing carboxylate groups or else to be combined in a copolymer with the monomers bearing no carboxylate groups.
  • the proportion of carboxylate monomers in the copolymers is 90 to 10 mol%, preferably 60 to 30 mol%.
  • water-insoluble monomers can be copolymerized with the above monomers, such as vinyl esters and the esters of acrylic and / or methacrylic acid with Cj-Cjo alcohols, styrene and alkylated styrenes.
  • the proportion of water-soluble monomers is 80 to 100% by weight, based on the total of the monomers.
  • the water-insoluble (hydrophobic) monomers generally make up 0 to 20% by weight of the monomers.
  • the acidic monomer components can be neutralized before the polymerization, the degree of neutralization preferably being between 10 and 95 mol%, in particular between 50 5 and 90 mol%, and in particular between 70 and 95 mol%.
  • Suitable bases for the neutralization are all common inorganic and organic compounds, in particular sodium hydroxide solution, potassium hydroxide solution and ammonia (ammonium hydroxide) are preferred.
  • Crosslinking monomers include, for example, bi- or polyfunctional monomers, e.g. Amides such as methylene bisacryl or methacrylamide or ethylene bisacrylamide, furthermore 5 allyl compounds such as allyl (meth) acrylate, preferably alkoxylated allyl (meth) acrylate
  • Methylene or ethylene bis (meth) acrylamide, N-methylolacrylamides and triallylamine are preferably used.
  • the proportion of the crosslinking comonomers is from 0.01 to 2.5% by weight, preferably from 0.01 to 1.0% by weight and particularly preferably from 0.01 to 0.1% by weight, based on the total of Monomers.
  • the carboxylate group-containing polymers to be used according to the invention can contain water-soluble polymers as the graft base, with amounts of up to 30% by weight being preferred. These include partially or fully saponified polyvinyl alcohols, starch 0 or starch derivatives, lignin or lignin derivatives, cellulose or cellulose derivatives, polyacrylic acids, polyglycols or mixtures thereof.
  • the polymers to be used according to the invention are post-crosslinked.
  • post-crosslinking which leads to a significant improvement in gel stability, the liquid absorption under pressure and the absorption speed
  • Ethylene glycol diglycidyl ether is preferably used as the post-crosslinking agent.
  • the post-crosslinking agent is used in an amount of 0.01 to 10 percent by weight, preferably 0.1-5 percent by weight, particularly preferably 0.1-1 percent by weight, based on the polymer to be post-crosslinked. 0
  • the poly (meth) acrylates to be used according to the invention can be prepared by customary processes, preferably in aqueous solution, batchwise in a polymerization vessel or continuously, for example on an endless belt.
  • REPLACEMENT BUTT (RULE 26) Polymerization is triggered using conventional initiators or redox systems which trigger free-radical polymerization. In the case of a practically adiabatic course of the polymerization, with an appropriate initial concentration of 15 to 50% by weight of the monomers, an aqueous polymer gel is formed. By choosing the initial monomer concentration and the corresponding low starting temperature in the temperature range from 0 to 50 ° C., preferably from 5 to 25 ° C., the polymerization can be carried out in such a way that the maximum temperature in the resulting aqueous polymer gel is easy to control. After the polymerization has ended, the polymer gel is mechanically comminuted, dried, ground and optionally subjected to surface crosslinking. 0
  • the suspension polymerization process is also suitable for the production of the poly (meth) acrylates, in which the discrete polymer particles are already formed during the polymerization.
  • Suitable mixing units for applying the post-crosslinking agent are e.g. Patterson-Kelley mixers, DRAIS turbulence mixers, Lödige mixers, Ruberg mixers, screw mixers, plate mixers and fluidized bed mixers, as well as continuously operating vertical mixers, in which the powder is mixed at a fast frequency using rotating knives (Schugi mixer).
  • the postcrosslinking reaction is heated to temperatures of 80 to 250 ° C., preferably to 135 to 250 ° C. and particularly preferably to 150 to 200 ° C.
  • the optimal duration of the reheating can easily be determined 5 for the individual types of crosslinker with a few tests. It is limited by the point at which the desired property profile of the superabsorber is destroyed again as a result of heat damage. For example, the crosslinking times for temperatures of 180 ° C are usually less than 30 minutes.
  • the poly (meth) acrylates can also contain processing and conditioning aids such as potassium stearate, polyglycol, silicas, bentonites.
  • the residual monomer content of the poly (meth) acrylates to be used according to the invention is low and is less than 1000 ppm, preferably less than 500 ppm and particularly preferably
  • REPLACEMENT BUTT (RULE 26) less than 250 ppm.
  • the residual content of ecotoxicologically questionable monomers such as acrylamide is preferably below 250 ppm.
  • the absorption capacity of the poly (meth) acrylates to be used according to the invention for water 5 and aqueous solutions can vary within wide limits and is affected by
  • Poly (meth) acrylates are preferably used which absorb more than 30 g / g, more than 50 g / g and particularly preferably more than 65 g / g polymer of a synthetic soil solution with a conductivity of 2.5 ⁇ S.
  • the synthetic soil solution 0 contains 0.71 g NaCl, 0.065 g NaN 3 , 1.676 g KCl, 0.353 NH 4 C1, 3.363 g MgCl 2 6H 2 O, 10.5 g CaCl 2 2H 2 O and 0.019 g FeCl per 10 1 water 3 6H 2 O.
  • Poly (meth) acrylate copolymers which have been prepared using comonomers which are free from carboxylate groups, in particular acrylamide, have a higher long-term stability of the absorption against frequently changing wet and dry phases during use. 0
  • the soluble proportions of the poly (meth) acrylates to be used according to the invention are usually below 20% by weight, preferably below 15% by weight and very particularly preferably below 10% by weight.
  • the particle size distribution of the polymers to be used can vary depending on the application, usually in the range of 0.2 to 3 mm.
  • the poly (meth) acrylates can be loaded with active substances which they release into the environment again in the course of the use according to the invention.
  • active ingredients include fertilizers, herbicides and pesticides.
  • the pH of acidic soils in general can be raised by up to one unit.
  • Soil pH value without KCl with KCl clay soil
  • the plants were then subjected to water stress treatment, i.e. No longer watered until the needles turned gray and fell off.
  • the protective colloid Stockosorb was effective even under very difficult soil drying conditions, in which the concentration of ions in the nutrient solution increases by at least one order of magnitude. Substantially fewer aluminum ions were found in the plants treated with Stockosorb and instead significantly higher concentrations of the divalent nutrient ions Ca and Mg.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Cultivation Of Plants (AREA)

Abstract

L'invention concerne un procédé permettant d'augmenter le pH dans les sols acides, qui consiste à traiter lesdits sols avec des polyacrylates ou des polyméthacrylates réticulés.
EP99915700A 1998-03-26 1999-03-24 PROCEDE PERMETTANT D'AUGMENTER LE pH DANS LES SOLS ACIDES Withdrawn EP1068279A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19813423 1998-03-26
DE19813423 1998-03-26
PCT/EP1999/002009 WO1999048998A1 (fr) 1998-03-26 1999-03-24 PROCEDE PERMETTANT D'AUGMENTER LE pH DANS LES SOLS ACIDES

Publications (1)

Publication Number Publication Date
EP1068279A1 true EP1068279A1 (fr) 2001-01-17

Family

ID=7862466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99915700A Withdrawn EP1068279A1 (fr) 1998-03-26 1999-03-24 PROCEDE PERMETTANT D'AUGMENTER LE pH DANS LES SOLS ACIDES

Country Status (3)

Country Link
US (1) US6484441B1 (fr)
EP (1) EP1068279A1 (fr)
WO (1) WO1999048998A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PE20030419A1 (es) * 2001-10-10 2003-05-31 Middleway Entpr Ltd Compuesto hidroabsorbente para acondicionar suelos para uso agricola, forestal y paisajistico
CA2661202C (fr) * 2006-09-12 2011-11-29 Soane Energy Llc Tensioactifs ajustables pour des applications de recuperation de petrole
DE102006058065A1 (de) 2006-12-07 2008-06-19 Basf Se Bewässerungsverfahren und -system für hydrogelhaltige Böden
WO2009061930A1 (fr) * 2007-11-09 2009-05-14 Soane Energy, Llc Systèmes et procédés pour le traitement de sables pétrolifères
DE102008049745A1 (de) 2008-09-30 2010-04-01 Basf Se Verringerung der Evapotranspiration von Pflanzen unter Wasserstress durch Superabsorber
DE102008049742A1 (de) 2008-09-30 2010-04-01 Basf Se Förderung des Wurzelwachstums von Pflanzen durch Superabsorber
DE102008049743A1 (de) 2008-09-30 2010-04-01 Basf Se Förderung des oberirdischen Wachstums von Pflanzen durch Superabsorber
WO2013044266A1 (fr) 2011-09-23 2013-03-28 Zynnovation Llc Recyclage de couches jetables et applications

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713253A (en) * 1972-01-24 1973-01-30 U Urban Treatment of soil
BE793650A (fr) * 1972-11-06 1973-07-03 Union Carbide Corp Polymeres particulaires meubles, insolubles et gonflables et procede pour les preparer
NZ201482A (en) * 1981-08-07 1984-12-14 Unilever Plc Cross-linked acrylamide/acrylic acid salt copolymer compositions for use as a plant growing media additive
JPS61195186A (ja) * 1985-02-25 1986-08-29 Kimura:Kk 無機質の混合土壌改良剤の製造法
GB8800578D0 (en) * 1988-01-12 1988-02-10 Fernandes P J F Improvements relating to plant growth media
JPH04161484A (ja) * 1990-10-26 1992-06-04 Mitsubishi Materials Corp 土壌改良材
US5514191A (en) * 1994-04-05 1996-05-07 Deerpoint Industries, Inc. Polymeric media amendment for growing mushrooms
US5645730A (en) * 1995-02-21 1997-07-08 Envirocorp Services & Technology, Inc. Acid wastewater treatement
JP2923227B2 (ja) * 1995-03-16 1999-07-26 東興建設株式会社 強酸性土壌の法面緑化工法
US5679364A (en) * 1995-06-07 1997-10-21 Lee County Mosquito Control District Compositions and methods for reducing the amount of contaminants in aquatic and terrestrial environments
US5707912A (en) * 1996-03-18 1998-01-13 Thiele Kaolin Company Process for the treatment of clay materials to provide slurries having improved rheological properties

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9948998A1 *

Also Published As

Publication number Publication date
US6484441B1 (en) 2002-11-26
WO1999048998A1 (fr) 1999-09-30

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