Hydrate kinetics inhibitor

Patent metadata

Field	Value
Publication number	US-11919978-B2
Application number	US-201817257318-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Dec 14, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A hydrate kinetic inhibitor, which is prepared by a polymerization of mercaptoethanol and N-vinylcaprolactam, is hydroxyl terminated poly(N-vinylcaprolactam) having a structure of formula (I) below, wherein n=10 to 1000. The inhibitor is a novel hydrate kinetic inhibitor, which has low effective concentration and high cloud point, and is effective when the degree of supercooling is relatively high.

First claim

We claim:

1. A method for producing a hydrate kinetic inhibitor, wherein the hydrate kinetic inhibitor is hydroxyl terminated poly(N-vinylcaprolactam) having a structure of formula (I), and n=10 to 1000,

the method comprising:
sequentially adding a chain initiator, a N-vinylcaprolactam, a mercaptoethanol, and a isopropanol into the reactor, wherein the molar ratio of the mercaptoethanol to the N-vinylcaprolactam is 1:20, the chain initiator is azobisisobutyronitrile, a molar ratio of the azobisisobutyronitrile to the N-vinylcaprolactam is 0.01:1, and a solid-to-liquid ratio of the N-vinylcaprolactam to the isopropanol is 1:15 g/mL, and stirring until dissolved; sealing the reactor using a rubber plug, and performing three cycles of vacuumizing and introducing nitrogen; reacting under the nitrogen atmosphere at 85° C. for 24 hours to obtain the reaction solution; drying the reaction solution by the rotary evaporation at 50° C., and cooling to the room temperature to obtain the crude product; dissolving the crude product in tetrahydrofuran and precipitating using n-hexane to obtain a precipitate; washing the precipitate with anhydrous ether, and sieving and drying to obtain the hydrate kinetic inhibitor.

Assignees

• Guangzhou Inst Energy Conversion Cas

Inventors

• Liang Deqing
• Wan Li

Classifications

• C08F126/06 Primary

  by a heterocyclic ring containing nitrogen · CPC title

• C08F8/34

  Introducing sulfur atoms or sulfur-containing groups · CPC title

• C08K5/315

  Compounds containing carbon-to-nitrogen triple bonds · CPC title

• C09K8/524

  organic depositions, e.g. paraffins or asphaltenes · CPC title

• C08F2810/40

  taking place solely at one end or both ends of the polymer backbone, i.e. not in the side or lateral chains · CPC title