Solution polymerization method

A polymerization method and solution technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of long initiator induction period, long time, and inability to obtain ultra-high molecular weight acrylamide polymers, etc., and achieve shortened polymerization Reaction time, effect of eliminating polymerization inhibition

Active Publication Date: 2014-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

The method has the characteristics of simple operation, safety and economy; but the above-mentioned traditional acrylamide polymer preparation method cannot obtain ultra-high molecular weight acrylamide polymer, and the induction period of the initiator in the above-mentioned method is relatively long, and the entire acrylamide polymerization The preparation process takes a long time
The reasons are: (1) Acrylamide, AMPS, etc. as monomer raw materials inevitably introduce a small amount of high-valent metal ions, polymerization inhibitors and other substances in the production process, which are not conducive to obtaining ultra-high molecular weight acrylamides. polymer; (2) The existing nitrogen filling and deoxygenation operation cannot sufficiently remove dissolved oxygen
In addition, the use of polymerizable surfactant monomers (such as methacryloyloxyethyl dimethyl benzyl ammonium chloride, (2-acrylamido) ethyl tetradecyl dimethyl bromide, etc. ammonium chloride) to modify acrylamide polymers, so that the modified acrylamide polymers can achieve better oil displacement has become a research hotspot, but nitrogen filling will make the aqueous solution containing surfactant monomers with polymerization ability A large number of bubbles are generated, therefore, the traditional nitrogen filling and deoxygenation operation cannot solve the deoxygenation problem in this type of polymerization system

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Effect test

Embodiment 1

[0041] (1) 150g acrylamide (AM), 150g 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 29g sodium hydroxide solid are mixed with 700g water under stirring, the aqueous solution obtained after mixing is cooled to 0 ℃, use mass concentration 20% by weight sodium hydroxide solution to adjust the pH value of the aqueous solution to 8.2, then add 0.07g EDTA disodium salt, 0.07g urea, 0.01g V50, 1mL mass concentration of 1% by weight to the aqueous solution Tetramethylethylenediamine solution, using the oxi3210 type dissolved oxygen meter (the same below) of German WTW company to measure the concentration of dissolved oxygen in the aqueous solution is 14.5ppm.

[0042] (2) Move the aqueous solution obtained in step (1) into a Dewar flask with a capacity of 1.5 L and add a thermocouple for recording the reaction temperature, keep the temperature of the aqueous solution at 0 ° C, and connect the aqueous solution with 0.09 g of solid under electromagnetic stirring Sodium sulfite was m...

Embodiment 2

[0051] (1) 225g of acrylamide (AM), 75g of acrylic acid (AAc), 40g of sodium hydroxide and 700g of water are mixed under stirring, the aqueous solution obtained after mixing is cooled to 10°C, and a sodium hydroxide solution with a mass concentration of 20% by weight is used Adjust the pH value of the aqueous solution to 9, then add 0.01g EDTA disodium salt, 0.02g azobisisopropylimidazoline, 1mL tetramethylethylenediamine solution with a mass concentration of 1% by weight to the aqueous solution, and use the solution The oxygen meter measures the concentration of dissolved oxygen in the aqueous solution to be 11.2ppm.

[0052] (2) Move the aqueous solution obtained in step (1) into a Dewar flask with a capacity of 1.5L and add a thermocouple for recording the reaction temperature, keep the aqueous solution temperature at 10°C, and connect the aqueous solution with 0.12g solid under electromagnetic stirring Sodium sulfite was mixed, and 0.2 ml of potassium persulfate solution w...

Embodiment 3

[0054] (1) 202g of acrylamide (AM), 98g of (2-acrylamido) ethyl tetradecyl dimethyl ammonium bromide and 700g of water were mixed under stirring, and the aqueous solution obtained after mixing was cooled to 5°C, Use mass concentration 20% by weight sodium hydroxide solution to adjust the pH value of the aqueous solution to 8, then add 0.01g EDTA disodium salt, 0.02g azobisisopropylimidazoline, 1mL mass concentration 1% by weight of Tetramethylethylenediamine solution, using a dissolved oxygen meter to measure the concentration of dissolved oxygen in the aqueous solution is 12.6ppm.

[0055] (2) Move the aqueous solution obtained in step (1) into a Dewar flask with a capacity of 1.5L and add a thermocouple for recording the reaction temperature, keep the aqueous solution temperature at 5°C, and dilute the aqueous solution with 0.05g solid under electromagnetic stirring Sodium sulfite was mixed, and after 1.5 minutes, 0.15 ml of potassium persulfate solution with a mass concentr...

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Abstract

The invention provides a solution polymerization method. The solution polymerization method comprises the following steps that an aqueous solution containing monomers and sodium hydrosulfite contact under oxidation reaction conditions; and after contact, the mixture is mixed with a persulfate under the conditions of acrylamide low-temperature polymerization, wherein the monomers comprise 75 to 100 mol% of acrylamide and a mole ratio of oxygen dissolved in the aqueous solution to sodium hydrosulfite is 1: (0.4 to 2). The solution polymerization method can avoid a process of nitrogen-filling oxygen-removal of an aqueous solution containing monomers, eliminate an inhibition effect produced by oxygen dissolved in the aqueous solution on monomer polymerization, realize preparation of an acrylamide polymer having ultra-high molecular weight, and greatly reduce polymerization time of acrylamide polymer preparation.

Description

technical field [0001] The present invention relates to a solution polymerization method. Background technique [0002] Acrylamide polymer is currently the main oil-displacing polymer used in tertiary oil recovery in oilfields. It has a good oil-displacement effect on type I oil reservoirs with low temperature and can greatly improve oil recovery. However, for Type II and III oil reservoirs with high temperature and salinity, in order to prepare ultra-high molecular weight acrylamide polymers in the prior art solution polymerization method, it is necessary to first purify acrylamide and other monomers to obtain the viscosity average molecular weight About 20-30 million acrylamide homopolymers (the viscosity-average molecular weight of unpurified acrylamide homopolymers is only 6-10 million), this acrylamide polymer is used as an oil displacement agent in high salinity and high The oil displacement effect cannot be obtained at high temperature; there are also studies using 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/56C08F4/40C08F2/10C08F220/58C08F220/56C09K8/588
Inventor 祝纶宇吴江勇王建宇
Owner CHINA PETROLEUM & CHEM CORP
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