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Polymers flocculating agents

The carboxylated units, ionized, decrease adsorption on subterranean substrates (23), ia proportion to the number of units, an important parameter ia petroleum recovery processes. In waste treatment processes cationic acrylamide comonomer units are often used (31) to iacrease adsorption and thereby flocculation of soHds ia wastewater (see Acrylamide POLYMERS Flocculating agents). The favorable and characteristics of acrylamide facilitate the... [Pg.317]

Anionic and nonionic polyacrylamides effectively remove suspended soHds such as silt and clay from potable water. SuppHers provide special grades which meet EPA/FDA regulations for residual acrylamides. A recent pubHcation (102) states that hydrolyzed polyacrylamides with narrow interchain charge distributions provide better performance in flocculation of clay. These polymers were prepared by alkaline hydrolysis. (See Flocculating agents.)... [Pg.143]

In the area of municipal and iadustrial wastewater treatment, the principal environmental issue is the toxicity of residual flocculating agents ia the effluent. Laboratory studies have shown that cationic polymers are toxic to fish because of the iateraction of these polymers with giU. membranes. Nonionic and anionic polymers show no toxicity (82,83). Other studies have shown that ia natural systems the suspended inorganic matter and humic substances substantially reduce the toxicity of added cationic polymer, and the polymers have been used successfully ia fish hatcheries (84—86). Based on these results, the EPA has added a protocol for testing these polymers for toxicity toward fish ia the presence of humic acids (87). The addition of anionic polymers to effluent streams containing cationic polymers to reduce their toxicity has been mentioned ia the patent Hterature (83). [Pg.37]

Some polymers from styrene derivatives seem to meet specific market demands and to have the potential to become commercially significant materials. For example, monomeric chlorostyrene is useful in glass-reinforced polyester recipes because it polymerizes several times as fast as styrene (61). Poly(sodium styrenesulfonate) [9003-59-2] a versatile water-soluble polymer, is used in water-poUution control and as a general flocculant (see Water, INDUSTRIAL WATER TREATMENT FLOCCULATING AGENTs) (63,64). Poly(vinylhenzyl ammonium chloride) [70304-37-9] h.a.s been useful as an electroconductive resin (see Electrically conductive polya rs) (65). [Pg.507]

Pretreatment Chemicals Even though the suspended solids concentration of the slurry to be tested may be correct, it is frequently necessary to modify the sluriy in order to provide an acceptable filtration rate, washing rate, or final cake moisture content. The most common treatment, and one which may provide improvement in all three of these categories, is the addition of flocculating agents, either inorganic chemicals or natural or synthetic polymers. The main task at this point is to determine which is the most effective chemical and the quantity of chemical which should be used. [Pg.1694]

To reduce or avoid agglomeration removal of certain impurities such as charged polymers could be effective - once identified, while to enhance agglomeration certain additives could be used as are commonly employed as flocculating agents to enhance solid-liquid separation in the water industry for example. These effects have to be determined empirically with care, however, since they can be pH and supersaturation dependent. [Pg.188]

The controlled flocculation method may be used in conjunction with the addition of a polymeric material to form a structured vehicle. After the formation of the floes, an aqueous solution of polymeric material, usually negatively charged, such as carboxy-methylcellulose or carbopol, is added. The concentration employed depends on the consistency desired for the suspension, which also relates to the size and density of the dispersed phase. Care must be taken to ensure the absence of any incompatibility between the flocculating agent and the polymer used for the formation of the structured vehicle. [Pg.262]

Allylic hydroperoxides, 13 435 Allylic organoboranes, 13 661-662 Allylic polymers, as flocculating agents, 11 631... [Pg.36]

Organic polymeric flocculating agents, mechanisms of, 77 632-633 Organic polymeric thin films, quasi phase matching in, 7 7 451 Organic polymers... [Pg.654]

Poly(ethylene oxide) (PEO), 10 665, 673-674 13 540, 542-543, 731. See also Ethylene oxide polymers association reactions of, 10 682 behavior in solution, 10 685 commercial block copolymers, 7 648t crystallinity of, 10 690 as a flocculating agent, 11 630-631 low molecular weight, 14 259 oxidation of, 10 682 in paper manufacture, IS 117 preparation of, 20 462 Polyethylene oxide chains, in cationic surfactants, 24 147... [Pg.731]

Aziridine is an intermediate and monomer in the preparation of cationic polymers, such as polyaziridine (polyethyleneimine). These polymers are used to improve wet strength of paper, in fuel-oil and lubricant refining, as flocculating agents and in protective coatings, in textile finishing and for adhesives, polymer stabilizers, and surfactants (Lewis, 1993 Scherr et al., 1995). [Pg.338]

Acrylic acid [79-10-7] - [AIR POLLUTION] (Vol 1) - [ALDEHYDES] (Vol 1) - [ALLYL ALCOHOL AND MONOALLYL DERIVATIVES] (Vol 2) - [MALEIC ANHYDRIDE, MALEIC ACID AND FUMARIC ACID] (Vol 15) - [POLYESTERS, UNSATURATED] (Vol 19) - [FLOCCULATING AGENTS] (Vol 11) - [CARBOXYLICACIDS - SURVEY] (Vol 5) -from acetylene [ACETYLENE-DERIVED CHEMICALS] (Vol 1) -from acrolein [ACROLEIN AND DERIVATIVES] (Vol 1) -acrylic esters from [ACRYLIC ESTER P OLYMERS - SURVEY] (Vol 1) -from carbon monoxide [CARBON MONOXIDE] (Vol 5) -C-21 dicarboxylic acids from piCARBOXYLIC ACIDS] (Vol 8) -decomposition product [MAT. ETC ANHYDRIDE, MALEIC ACID AND FUMARIC ACID] (Vol 15) -economic data [CARBOXYLIC ACIDS - ECONOMIC ASPECTS] (Vol 5) -ethylene copolymers [IONOMERS] (Vol 14) -in floor polishes [POLISHES] (Vol 19) -in manufacture of ion-exchange resins [ION EXCHANGE] (V ol 14) -in methacrylate copolymers [METHACRYLIC POLYMERS] (Vol 16) -in papermaking [PAPERMAKING ADDITIVES] (Vol 18)... [Pg.12]

Flocculation - [ACRYLAMIDE POLYMERS] (Vol 1) - [FLOCCULATING AGENTS] (Vol 11) - [SEDIMENTATION] (Vol 21) -dye water effluent treatment [DYES, ENVIRONMENTAL CHEMISTRY] (Vol 8) -of emulsions [EMULSIONS] (Vol 9) -minerals processing [MINERALS RECOVERY AND PROCESSING] (Vol 16) -PEO in [POLYETHERS - ETHYLENE OXIDE POLYMERS] (Vol 19) -useofethyleneimines [IMINES,CYCLIC] (Voll4) -useofSCFs [SUPERCRITICALFLUIDS] (Vol 23) -water treatment for steam prdn [STEAM] (Vol 22)... [Pg.407]

Mineral processing - [ACRYLAMIDE POLYMERS] (Vol 1) -flocculants m [FLOCCULATING AGENTS] (Vol 11)... [Pg.636]

See other pages where Polymers flocculating agents is mentioned: [Pg.13]    [Pg.514]    [Pg.389]    [Pg.32]    [Pg.35]    [Pg.36]    [Pg.37]    [Pg.37]    [Pg.27]    [Pg.413]    [Pg.17]    [Pg.88]    [Pg.490]    [Pg.101]    [Pg.405]    [Pg.82]    [Pg.281]    [Pg.192]    [Pg.50]    [Pg.205]    [Pg.436]    [Pg.615]    [Pg.30]    [Pg.412]    [Pg.490]    [Pg.157]    [Pg.101]    [Pg.202]    [Pg.290]    [Pg.305]    [Pg.344]    [Pg.514]    [Pg.662]    [Pg.725]    [Pg.653]    [Pg.653]   
See also in sourсe #XX -- [ Pg.259 , Pg.260 ]



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