Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
  • C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • C08G81/021—Block or graft polymers containing only sequences of polymers of C08C or C08F
• • 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
  • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
  • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material

Definitions

• the present invention relates to modified polyelectrolytes which are useful as flocculents 1n separation processes, to processes for preparing the modified polyelectrolytes, flocculent compositions Incorporating the modified polyelectrolytes and to separation methods employing the modified
• the modified polyelectrolytes of the Invention perform better than the prior art polyelectrolytes in that they are capable of achieving the same level of flocculation at lower concentrations and are capable of retaining a higher percentage of super fines.
• Practical synthetic organic flocculants are water soluble polymeric substances with weight average molecular weights ranging from about 1000 to greater than 5 million (reported values as high as 20 million).
• Polyelectrolytes used as flocculants include polymers and copolymers made from a number of monomers including maleic anhydride, maleic add, acrylic acid, acrylamlde, acrylonitrile, methacrylic acid, vinyl sulfonlc acid, p-styrene sulfonic acid, styrene, vinyl methyl ether, metaphosphorlc add, vinylamine, ethyleneimine, vinyl pyri di ne and 4-vinyl-N- dodecylpyrldinium chloride.
• a modified polyelectrolyte characterized in that a polyelectrolyte is reacted with a copolymer of at least two ethylenically unsaturated monomers, at least one of which contains anhydride groups.
• a process for manufacturing a modified polyelectrolyte comprises reacting a polyelectrolyte with a copolymer of at least 2 ethylenically unsaturated monomers, at least one of which contains add anhydride groups.
• the reaction can be initiated by heat and/or by an inorganic accelarator such as a metallic base.
• a suitable accelerator is potassium carbonate.
• polyelectrolytes suitable for use in this invention are extremely numerous and diversified. No unsuitable commercially available or laboratory synthesized polyelectrolyte has been found. Common trade names defining such polyelectrolytes include: SANYOFLOC; ALFLOC; SUPERFLOC;
• the polyelectrolytes which can be modified according to the invention have molecular weights in the range 2x10 4 to 1x10 8 , especially 1x10 5 to 7x10 6 daltons.
• polyelectrolytes are reacted have molecular weights in the range 1x10 4 to
• a known polyelectrolyte flocculant is reacted with a copolymer of methyl vinyl ether and maleic anhydride.
• a third embodiment of the invention provides a further modified polyelectrolyte characterized in that the modified polymer according to the first embodiment of the invention is further modified by reaction with vinyl pyrrolidone or polyvinyl pyrrolidone followed by further reaction with the copolymer.
• a fourth embodiment of the invention provides a process for manufacturing a further modified polyelectrolyte which process comprises terminating the process according to the second embodiment of the invention by reducing the temperature, dispersing the reaction mixture with v inyl
• the further reaction can also be Initiated by heat and/or by an Inorganic accelerator.
• a fifth embodiment of the invention provides a flocculating composition
• a flocculating composition comprising a modified polyelectrolyte or a further modified polyelectrolyte according to the invention in association with the usual carriers and diluent employed in conventional flocculating compositions.
• a sixth embodiment of the invention provides a method of flocculation which method comprises adding to a material to be flocculated a modified polyelectrolyte, a further modified electrolyte and/or a flocculating composition according to the invention.
• Polymer solids at an amount of between 0 and 200%, preferably 10%. by weight (on the basis of polyelectrolyte solids) may effectively be employed in this invention.
• reaction is carried out by simple mixing or
• reaction times and reaction temperatures will depend on the nature of the polyelectrolyte and the copolymer but generally the reaction can be carried out at temperature of between 0° and 120oC for a time of between 5 minutes to 4 hours. It is preferred that the polyelectrolyte and copolymer be selected such that the reaction can be carried out at a temperature of between 40° and 80oC for a time of up to 50 minutes. Preferably, the reaction is carried out in solution.
• the reaction is stopped, preferably by reducing the temperature to below 30oC, vinyl pyrrol idone or polyvinyl pyrrolidone is added, the mixture is agitated or stirred to disperse the vinyl pyrrolidone or polyvinyl pyrrolidone and the mixture is reheated to restart the reaction. If there is an excess of copolymer, the vinyl pyrrolidone or polyvinyl pyrrolidone is added, the mixture is agitated or stirred to disperse the vinyl pyrrolidone or polyvinyl pyrrolidone and the mixture is reheated to restart the reaction. If there is an excess of copolymer, the vinyl
• polyvinyl pyrrolidone reacts with the anhydride moiety of either reacted or unreacted copolymer resulting in a mixture of further modified polyelectrolyte and modified copolymer.
• the ratio of vinyl pyrrolidone or polyvinyl pyrrolidone to copolymer is in the range 1:1 to 1:10 by weight, more
• the amounts of poly(methyl vinyl ether/maleic anhydride) were varied between 0 to 100% of the solids of base polyelectrolytes.
• polymer solids (based on polyelectrolyte solids) with molecular weight of poly(methyl vinyl ether/maleic anhydride) at 67,000 daltons.
• Example 2 is based on the above percentage and molecular weight.
• the base polymer number refers to Table 1.
• Example 1 The polymers prepared in Example 1 were evaluated for efficiency by comparison with the polyelectrolytes from which they were derived. In all cases the performance of the new materials was superior to that of the polyelectrolytes from which they were derived. Comparisons conducted at mine sites were advantageously done by selecting a polyelectrolyte with correct charge density for the materials being separated and comparing these with modified polyelectrolytes comprising the same base
• a Latex polymer of the following characteristics was prepared.
• This polymer was cooled to below 30oC then further reacted with 1.5% by weight poly(methyl vinyl ether/maleic anhydride) with a mw 80,000
• the reaction was carried out by dispersing the powder through the latex and placing into a water bath at 50oC for 50 minutes. On cooling the flocculent latex was packaged.
• a solution polymer of the following characteristics was cooked.
• This polymer was reacted with 0.5% polymer (methyl vinyl ether/maleic anhydride) with a mw of 67000 daltons(ex GAF).
• the reaction was carried out by dispersing the powder through the solution and placing into a water bath at 60°C for 4 hours. The resultant mixture was cooled to below 30oC and 1.0% of polyvinyl pyroll idone was dispersed into the mixture. The mixture was replaced into the water bath for 2 hours. On cooling the flocculent solution was packaged.
• a latex polymer of the following characteristics was prepared. Organic solids 28.5% pH(1%) 8.0
• Ratio Acrylamide:Acrylic Acid 34 23 nominal mw 12x10 6
• This polymer was cooled to below 30°C then further reacted with 2.5% by weight of poly(methyl vinyl ether/maleic anhydride) mw 67,000 (daltons) dispersed in twice Its weight of 1n aromatic solvent.
• This mixture was cooled to below 30oC and 0.5% of polyvinyl pyrrolidone was dispersed in the mixture. The mixture was replaced Into the water bath for 30 min. On cooling the flocculent latex was packaged.
• a solution polymer of the following characteristics was prepared.
• This polymer was reacted with 0.57. poly(methyl vinyl ether/mlleic anhydride) with a mw 80,000 daltons.
• the reaction was carried out by dispersing the powder through the solution and placing Into a water bath at 60°C for 4 hours. The resultant mixture was cooled to below 30°C and 0.1% of polyvinyl pyrrolidone was dispersed in the mixture. The mixture was replaced into the water bath for 2 hours. On cooling the flocculent solution was packaged.
• a solution polymer of the following characteristics was prepared.
• This base polymer was reacted with 0.5% w/w poly(methyl vinyl ether/ maleic anhydride) with a mw of 67,000 daltons.
• the reaction was carried out by dispersing the powder through the solution and placing into a sealed container in a water bath for 4 hours at 60°C.
• the resultant mixture was cooled to below 30C and 0.1% of polyvinyl pyrrolidone was dispersed in the mixture.
• the mixture was replaced into the water bath for.2 hours. On cooling the flocculent solution was packaged.
• a solution polymer of the following characteristics was prepared.
• This base polymer was reacted with 0.57. poly(methyl vinyl ether/maleic anhydride) with a mw of 67,000 daltons.
• the reaction was carried out by dispersing the powder through the solution and placing it into a sealed container in a water bath for 4 hours at 60oC.
• the resultant mixture was cooled to below 30oC and 0.1% of polyvinyl pyrrolidone was dispersed in the mixture.
• the mixture was replaced Into the water bath for 2 hours. On cooling the flocculent solution was packaged.
• the present invention provides modified polyelectrolytes which are useful as flocculents and find use in separation processes from fields as diverse as water treatment, oil refining, metal finishing, food processing, paper milling, mineral processing and manufacturing processes.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Water Supply & Treatment (AREA)
• Engineering & Computer Science (AREA)
• Hydrology & Water Resources (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)

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• 1989
  • 1989-12-04 MY MYPI89001693A patent/MY105082A/en unknown
  • 1989-12-04 EP EP19900900031 patent/EP0400129A4/en not_active Withdrawn
  • 1989-12-04 CA CA002004549A patent/CA2004549A1/en not_active Abandoned
  • 1989-12-04 JP JP2500110A patent/JPH03503295A/ja not_active Withdrawn
  • 1989-12-04 WO PCT/AU1989/000523 patent/WO1990006336A1/en not_active Application Discontinuation
  • 1989-12-05 CN CN89109764.3A patent/CN1043298A/zh active Pending
  • 1989-12-05 IN IN1142DE1989 patent/IN176443B/en unknown
  • 1989-12-05 IL IL92554A patent/IL92554A0/xx not_active IP Right Cessation
• 1990
  • 1990-08-03 DK DK186090A patent/DK186090A/da not_active Application Discontinuation
• 1995
  • 1995-03-17 CN CN95100572.3A patent/CN1112906A/zh active Pending

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