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Hyperbranched polyvinylpyrrolidone natural gas hydrate inhibitor with inner salt structure, preparation method and application thereof

A technology of polyvinylpyrrolidone and vinylpyrrolidone, which is applied in the field of natural gas hydrate inhibitors and its preparation, to achieve the effects of stable product performance, low use concentration, and high inhibitory performance

Active Publication Date: 2020-07-10
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in offshore oil and gas fields where the temperature and pressure conditions are suitable for the formation of hydrates, the economic losses caused by the formation are as high as hundreds of millions of yuan

Method used

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  • Hyperbranched polyvinylpyrrolidone natural gas hydrate inhibitor with inner salt structure, preparation method and application thereof
  • Hyperbranched polyvinylpyrrolidone natural gas hydrate inhibitor with inner salt structure, preparation method and application thereof
  • Hyperbranched polyvinylpyrrolidone natural gas hydrate inhibitor with inner salt structure, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1. Preparation of Inner Salt Structure Hyperbranched Polyvinylpyrrolidone Natural Gas Hydrate Inhibitor

[0069] (1) Preparation of monomers containing zwitterions: 12g of 4-vinylpyridine and 10g of 1,3-propane sultone under the action of 2g of hydrochloric acid, the reaction temperature is 80°C, and the reaction time is 8 hours to prepare VPPS by ring-opening polymerization (Formula I);

[0070] (2) Dissolve 71g NVP (vinylpyrrolidone) and 134gVPPS in 400g H 2 O, mechanical stirring, passing condensed water, passing N 2 ; warm up to 45°C, inject CeCl 3 30mg, react for 1.5 hours;

[0071] (3) Inject 5.4mg HPG and add 30mg CeCl 3 , reacted for 1.5 hours, and kept at 45°C;

[0072] (4) Add 2g NVP and 1gVPPS, add 2g of fluorocarbon amphiphilic surfactant, and react for 1.5 hours;

[0073] (5) Place the reactor in an oven at 80° C. for 4 hours.

[0074] (6) Take out the reactor, add 16.0 g NaOH therein, pass condensed water, stir mechanically, and hydrolyze at...

Embodiment 2

[0079] Example 2. Preparation of Inner Salt Structure Hyperbranched Polyvinylpyrrolidone Natural Gas Hydrate Inhibitor

[0080] (1) Preparation of zwitterionic monomers: 14g of vinylpyridine and 14g of 1,3-propane sultone were reacted with 4g of hydrochloric acid, the reaction temperature was 90°C, and the reaction time was 6 hours to prepare VPPS through ring-opening polymerization;

[0081] (2) Dissolve 68gNVP and 128gVPPS in 390g H 2 O, mechanical stirring, passing condensed water, passing N 2 ; warm up to 50°C, inject CeCl 3 40mg, react for 2 hours;

[0082] (3) Inject 5.0mg HPG and add 40mg CeCl 3 , reacted for 2 hours, and kept at 50°C;

[0083] (4) Add 3g NVP and 1.5g VPPS, add 3g of fluorocarbon amphiphilic surfactant, and react for 2 hours;

[0084] (5) Place the reactor in an oven at 90° C. for 6 hours.

[0085] (6) Take out the reactor, add 16.8g NaOH therein, pass condensed water, stir mechanically, and hydrolyze at 120° C. for 4 hours.

[0086] The evaluati...

Embodiment 3

[0089] Example 3. Preparation of Inner Salt Structure Hyperbranched Polyvinylpyrrolidone Natural Gas Hydrate Inhibitor

[0090] (1) Preparation of zwitterionic monomers: 16g of vinylpyridine and 14g of 1,3-propane sultone were reacted with 4g of hydrochloric acid, the reaction temperature was 90°C, and the reaction time was 7 hours to prepare VPPS through ring-opening polymerization;

[0091] (2) Dissolve 72g NVP and 136g VPPS in 400g H 2 O, mechanical stirring, passing condensed water, passing N 2 ; warm up to 48°C, inject CeCl 3 35mg, react for 2 hours;

[0092] (3) Inject 6.0mg HPG and add 35mg CeCl 3 , reacted for 1.5 hours, and kept at 48°C;

[0093] (4) Add 2.5gNVP1.25gVPPS, add 2.5g of fluorocarbon amphiphilic surfactant, and react for 1.5 hours;

[0094] (5) Place the reactor in an oven at 85° C. for 5 hours.

[0095] (6) Take out the reactor, add 17g NaOH therein, pass condensed water, stir mechanically, and hydrolyze at 130° C. for 3 hours.

[0096] The evalua...

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Abstract

The invention discloses a hyperbranched polyvinylpyrrolidone natural gas hydrate inhibitor with an inner salt structure, a preparation method and application thereof. The preparation method comprisesthe following steps: (1) under the action of hydrochloric acid, carrying out ring-opening reaction on 4-vinylpyridine and 1, 3-propane sultone to obtain a monomer containing zwitterions, (2) dissolving vinylpyrrolidone and the monomer containing zwitterions in water, and adding a cerium salt for a reaction; (3) adding hydroxyl-terminated polyether ester polyol and a cerium salt into the reaction system of step (2), and further carrying out reaction; (4) further adding vinylpyrrolidone and a fluorocarbon amphiphilic surfactant into the reaction system of step (3), and further carrying out reaction; and (5) drying the reaction system in the step (4), and carrying out alkaline hydrolysis. The product disclosed by the invention is stable in performance, can be used as a natural gas hydrate inhibitor and can obviously delay the induction time.

Description

technical field [0001] The invention relates to a hyperbranched polyvinylpyrrolidone natural gas hydrate inhibitor with an inner salt structure, a preparation method and application thereof, and belongs to the technical field of natural gas hydrate inhibitors and its preparation. Background technique [0002] Hydrate formation can cause blockage of natural gas, oil production equipment and gathering pipelines. Especially in offshore oil and gas fields where the temperature and pressure conditions are suitable for the formation of hydrates, the economic losses caused by the formation are as high as hundreds of millions of yuan. Therefore, how to prevent the formation of hydrates has always been the difficulty and focus of the oil and gas industry. [0003] At present, there are two control methods in the world: kinetic control method and thermodynamic suppression method, among which the most widely used method is thermodynamic suppression method, which is characterized by de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/06C08F226/10C08F4/40C09K8/524F17D1/16
CPCC08F226/06C08F4/40C09K8/524F17D1/16C08F226/10
Inventor 吕鑫李清平梁守成葛阳陈冠中王君傲姚海元李丽霞
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD