Preparation method of nano polyaluminum iron silicate-graft modified starch hybrid flocculant

Abstract

The invention discloses a preparation method of a namometer PAFSI-graft modified starch hybrid flocculent. The preparation method is characterized by comprises the steps that 20 parts of Na2SiO3 and 350 parts of deionized water are added to a reaction bottle, the pH value ranges from 2 to 5, the room temperature reaction is performed for 2-3 h, and activated silicic acid is prepared; a certain amount of AlCl3 and FeCl3 ethylene glycol solution is added slowly in 20 parts of activated silicic acid for reaction, 1-5 parts of CTAC (cetanecyl trimethyl ammonium chloride) is added after cooling, curing is performed, and namometer PAFSI is prepared; 20 parts of starch and 20-400 parts of deionized water are added to the reaction bottle, N2 is fed, the starch is cooled to 30 DEG C after gelatinized for 0.5-1 h under stirring and at the temperature of 65 DEG C to 90 DEG C, 0.5-6.0 parts of CTAC is added, 2-10 parts of nanometer PAFSI is added, the pH value ranges from 5 to 7, 0.05-0.5 part of potassium persulfate and 0.02-0.3 part of sodium sulphite are added at the temperature of 30 DEG C to 55 DEG C, 3-10 parts of cationic monomers and 2-10 parts of macromonomers are added slowly, N2 is fed, the reaction is performed for 4-8 h, and the namometer PAFSI-graft modified starch hybrid flocculent is prepared.

Description

1. Technical field [0001] The invention relates to a preparation method of a nano polyaluminum iron silicate-graft modified starch hybrid flocculant, which can be used for oil and gas field fracturing flowback fluid, oil and gas field produced water, printing and dyeing, papermaking, textile, steel, The water treatment of brewing, petrochemical, metallurgical and food waste water belongs to the fields of environmental engineering, inorganic chemistry, polymer materials and oilfield chemistry. 2. Background technology [0002] In the treatment of industrial wastewater and domestic sewage, coagulation is one of the essential and important processes. Its purpose is to remove insoluble suspended solids, colloidal particles and organic matter in water, and flocculants play a key role in coagulation technology. Inorganic polymer polyaluminum chloride (PAC) and polyferric sulfate (PFS) are commonly used flocculants, but PFS is easy to cause color pollution, so PAC is used in the la...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the currently commonly used cationic acrylamide copolymer flocculants are difficult to degrade and have weak coagulation ability for high-salt wastewater; cationic modified starch flocculants have low molecular weight and high dosage, and the coagulation performance needs to be improved urgently , the removal effect of dissolved organic matter is poor, and the COD in the effluent is relatively high. It provides a nano-polyaluminum silicate that can be used for coagulation treatment of oil and gas extraction wastewater, industrial wastewater and urban domestic sewage without secondary pollution. The preparation method of iron-graft modified starch hybrid flocculant PAFSI-SMVB is characterized in that Na 2 SiO 3 , FeCl 3 and AlCl 3 Nano-polyaluminum-iron-silicate PAFSI was prepared with ethylene glycol as the raw material; the nano-PAFSI particles were hybridized with starch, and cationic monomers and macromonomers were grafted onto the hybridized starch through aqueous solution copolymerization. On the starch macromolecular chain, a nano-polyaluminum iron silicate-graft modified starch hybrid flocculant PAFSI-SMVB was prepared, in which the cationic monomer was dimethyl diallyl ammonium chloride, ethyl methacrylate At least one of trimethyl ammonium chloride, ethyl acrylate trimethyl ammonium chloride and 2-acrylamido-2-methylpropyl trimethyl ammonium chloride, the macromonomer is 4-ethylene benzyl alkylphenol polyoxyethylene ether CH 2 =CH-C 6 h 4 -CH 2 (OCH 2 CH 2 ) n -O-C 6 h 4 -C m h 2m+1 , n=16~100, m=1~9 and allyl alkylphenol polyoxyethylene ether CH 2 =CH-CH 2 (OCH 2 CH 2 ) n -O-C 6 h 4 -C m h 2m+1 , n=16~100, m=at least one of 1~9

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