Synthesis method of hydrate inhibitor polyvinyl caprolactam

Abstract

The invention discloses a method for commercial synthesis of hydrate inhibitor polyvinyl caprolactam, which includes the following steps of: A, reaction: distilling vinylcaprolactam and vinylimidazole under reduced pressure to remove the polymerization inhibitor, then putting the mixture into a 3-neck flash together with azo bibutyl imidazoline hydrochloride and absolute ethyl alcohol, introducing nitrogen for protection, stirring until the temperature rises to 65-80 DEG C, making the materials react for 7 hours and then stopping the reaction; and B post-processing: making the reaction solution directly pass through a spray dryer to obtain white solid powder. In a variety of patents of polymer synthesis methods, no spray dryer is mentioned, and compared with other post processing methods, the method of adopting the spray dryer for drying has the advantages that the operation is simplified and a basis for industrial production is achieved. Meanwhile, the inhibition of the hydrate inhibitor polyvinyl caprolactam obtained through the method barely changes, and the hydrate inhibitor polyvinyl caprolactam has good inhibition effect.

Description

Technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a method for synthesizing kinetic inhibitor polyvinyl caprolactam. Background technique [0002] Natural gas hydrate is an ice-like white solid substance formed by natural gas and water at low temperature and high pressure. Because its natural gas component is mostly methane, it is also called methane hydrate. Natural gas can be porous in pipelines, well bores and formations. The formation of hydrates in the medium is very harmful to oil and gas production, storage and transportation. At present, there are three types of natural gas hydrate crystal structures that have been discovered, which are customarily called type I, type II and type H structures. The water molecules that form hydrates are called hosts, and the other components that form hydrates are called guests. The host water molecules are connected by hydrogen bonds to form some polyhedral cages. Guest molecule...

AI Technical Summary

Problems solved by technology

[0007] Since the various inhibitors mentioned above belong to large foreign companies, and the products need to be imported, the cost is relatively high, resulting in slow promotion and application in my country.

[0008] The domestic research is to compound foreign inhibitors (such as Vcap) with other substances. The problem exists because it depends on foreign products, so the cost is very high, and it cannot be popularized and applied.