Flocculant modification method

FIELD: chemistry.

SUBSTANCE: polyacrylamide-based flocculant modification method includes using microwave radiation directed on the starting crystalline polyacrylamide product. The microwave radiation has the following properties: frequency 2.45 GHz, power 700 W, duration of irradiating crystals of the starting flocculant 5-7 s.

EFFECT: method creates conditions for further interaction of macromolecules with each other and increase in molecular weight thereof, which improves the process.

1 tbl, 2 ex

 

The invention relates to the chemistry of polymers, namely the method of production of high-molecular compounds based on polyacrylamide (PAA) with high molecular mass needed to accelerate the deposition of the solid phase and increase the level of treatment, suspensions, using solid-phase modification of the original product.

A method of obtaining flocculant based on PAA as the modifying agent used, the reaction product of epichlorohydrin and a mixture of salts of higher fatty acids With16-C20[1].

The disadvantage of this technical solution is that this mixture is atomized in the solution of the grafted copolymer PAA with carboxymethylcellulose, interaction takes place at a sufficiently high temperature 60-80°C and is relatively small, the efficiency of the flocculant.

Closest to the claimed technical solution is the modification of PAA in solution using physico-chemical effects of microwave irradiation (MWI). This information source is selected as the prototype [2].

The disadvantage of this technical solution is carrying out modifications in solutions. This creates great technological difficulties in large-scale industrial production (mining, pulp and paper, mining and other the IDA industry).

The task, which directed the claimed invention is a method of direct solid-phase modification with the use of MIM, the original crystalline product - PAA, which creates conditions for an additional interaction of PAA macromolecules with each other and increase their molecular weight.

This task is solved by a direct solid-phase modification using MIM. According to modern scientific views directed solid-phase degradation of polymers, consists of two stages:

1 is a partial destruction of the individual macromolecules in the solid phase;

2 - subsequent Assembly of new structures or new polymerization when they are dissolved in an effective solvent.

Feature MIM: frequency of 2.45 GHz, power of 700 W, the duration of irradiation of the crystals original flocculant 5-7 C.

The experiment is carried out with the original powder product (flocculant), which before the dissolution was subjected to purposeful effect MIM with a frequency of 2.45 GHz for 5-7 with microwave power of 700 W, which creates conditions for an additional interaction of macromolecules with each other and increase their molecular weight.

According to theoretical studies it is known that the processes of polymerization in the solid phase can be divided into slow and fast. Slow polymerization of proishodit with a high value of activation energy. It starts with the occurrence of stresses and defects in the crystal lattice with the change of interatomic distances, obtaining radicals (impact MIM). To complete this reaction requires the elimination of defects when received rearrangement of atoms and join in the reaction of the resulting radicals. The lifetime of the radicals in the solid phase is large - up to several months. By electron microscopy proved that rapid polymerization (the second part of the process of destruction) occurs with explosive speed, with the addition of the solid phase suitable for the dissolution of the solid phase of the solvent (dissolving)that is explained by the higher mobility of parts of the crystal lattice and previously arisen radicals. Such techniques physical modification of polymers allow you to create new classes of high-molecular compounds and in a wide range to change their properties and applications [4].

Example 1 (the original PAA). Exact sample was prepared with a 0.5%aqueous solution of PAA volume of 100 ml of powder flocculant brand Magnafloc-919 English company Ciba and carried out the measurement of kinematic viscosity using a glass viscometer with subsequent determination by known methods characteristic viscosity and calculation of the molecular weight of PAA by the equation Mark-Houwink [3].

Primer (the prototype). Exact sample was prepared with a 0.5%aqueous solution of PAA volume of 100 ml of powder flocculant brand Magnafloc-919 English company Ciba, which was subjected to MWI for 5 s at microwave power of 100 watts. It was further conducted measurement of kinematic viscosity using a glass viscometer with subsequent determination by known methods characteristic viscosity and calculation of the molecular weight of PAA by the equation Mark-Houwink.

Examples 3-5 (the proposed method). Preparing a 0.5%aqueous solution of PAA brand Magnafloc-919 English company Ciba. Crystals are the source of flocculant (PAA) before dissolution was subjected to MWI with a frequency of 2.45 GHz for 5-7 with microwave power of 700 watts. It was further conducted measurement of kinematic viscosity with subsequent determination of the characteristic viscosity and calculation of the molecular weight of PAA by the equation Mark-Houwink. The test results presented in the table.

From experimental data it follows that the molecular weight of the original PAA in the implementation of the proposed technical solution increases 1.6 times.

LITERATURE

1. USSR author's certificate No. 1595850, CL C08F 220/56, 02F 1/56, publ. 1990, bull. No. 36.

2. RF patent №2330814 ÁL 3 SL 5/14, 3 ÁL SL 5/10 / Ulrich E.V., Shevchenko T.V., Yakovchenko M.A., Allenco VP, Chu the Cove A.S., publ. 10.082008, bull. No. 22 (prototype).

3. Shevchenko, T.V. studies of the physico-chemical properties of modified polyelectrolytes based on polyacrylamide / Twichell, Maakotka, Everrich // Chemical industry today. - 2004. No. 10. - P.27-31.

4. Shevchenko,T. the Influence of wave exposure on the modification process and physical-chemical properties of the modified flocculants / Twichell, Austempered, Evelina, Launcherone // Chemical industry today. - 2008. No. 5. - C.11-15.

Modification of flocculant based on polyacrylamide, namely, that the original crystalline product polyacrylamide is subjected to microwave radiation with a frequency of 2.45 GHz, with an output of 700 W, the duration of irradiation of the crystals original flocculant 5-7 C.



 

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