Solution polymerization method

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

Active Publication Date: 2013-01-23
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 of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 29g of solid sodium hydroxide and 700g of water were mixed under stirring, and the aqueous solution obtained after mixing was cooled to 0° C., using 20% ​​by weight sodium hydroxide solution to adjust the pH value of the aqueous solution to 8.2, and then adding 0.07g of EDTA disodium salt, 0.07g of urea, 0.01g of V50, 1 mL of 1% by weight of EDTA to the aqueous solution. For the tetramethylethylenediamine solution, the dissolved oxygen concentration in the aqueous solution was measured using an oxi3210 type dissolved oxygen meter (the same below) from WTW, Germany, and it was 14.5 ppm.

[0042] (2) The aqueous solution obtained in step (1) was transferred into a Dewar flask with a capacity of 1.5 L, and a thermocouple for recording the reaction temperature was added. Sodium sulfite was mixed, and 0.2 ml of ammonium persulfate solution with a mass concentration of 1% by weight was adde...

Embodiment 2

[0051] (1) Mix 225 g of acrylamide (AM), 75 g of acrylic acid (AAc), 40 g of sodium hydroxide with 700 g of water under stirring, cool the aqueous solution obtained after mixing to 10 ° C, and use a 20 wt % sodium hydroxide solution with a mass concentration The pH value of the aqueous solution was adjusted to 9, and then 0.01 g of EDTA disodium salt, 0.02 g of azodiisopropyl imidazoline, and 1 mL of a 1 wt % tetramethylethylenediamine solution were added to the aqueous solution. The concentration of dissolved oxygen in the aqueous solution measured by an oxygen meter was 11.2 ppm.

[0052] (2) The aqueous solution obtained in step (1) was transferred into a Dewar flask with a capacity of 1.5 L, and a thermocouple for recording the reaction temperature was added. Sodium sulfite was mixed, and 0.2 ml of potassium persulfate solution with a mass concentration of 1 wt % was added to the aqueous solution (the temperature of the aqueous solution was 10° C. at this time, and the con...

Embodiment 3

[0054] (1) 202g of acrylamide (AM), 98g of (2-acrylamido)ethyltetradecyldimethylammonium bromide and 700g of water were mixed under stirring, and the aqueous solution obtained after mixing was cooled to 5°C, The pH value of the aqueous solution was adjusted to 8 using a 20% by weight sodium hydroxide solution, and then 0.01g of EDTA disodium salt, 0.02g of azodiisopropyl imidazoline, 1mL of 1% by weight of EDTA were added to the aqueous solution. The concentration of dissolved oxygen in the aqueous solution of the tetramethylethylenediamine solution was 12.6 ppm as measured by a dissolved oxygen meter.

[0055] (2) Transfer 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 5°C, and connect the aqueous solution with 0.05 g of solid under electromagnetic stirring. Sodium sulfite was mixed, and 0.15 ml of potassium persulfate solution ...

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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 the main oil displacement polymer currently used for tertiary oil recovery in oilfields. However, for Class 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 purify monomers such as acrylamide before obtaining the viscosity average molecular weight. Acrylamide homopolymer of about 20-30 million (the viscosity-average molecular weight of unpurified acrylamide homopolymer is only 6-10 million), the acrylamide polymer is used as oil displacement agent in high salinity and high The oil displacement effect cannot be obtained at high temperature; there are also studies using 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and acrylamide copolymerization to obtain a polymer with a certain increa...

Claims

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Application Information

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Patent Type & Authority Applications(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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