32results about How to "Clear water phase" patented technology

The invention relates to a polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan type crude oil demulsifier and a preparation method thereof. The structure general formula of the demulsifier is as shown in the formula I, and the preparation method of the demulsifier comprises the followings: (1) chitosan is subjected to alkylation modification, so as to obtain alkylated chitosan; (2) the alkylated chitosan is subjected to carboxyalkylation modification, so as to obtain alkylated carboxyalkyl chitosan; (3) terminal hydroxyl of polyethylene glycol monomethyl ether is subjected to esterification modification, so as to obtain esterified polyethylene glycol monomethyl ether; and (4) the modified polyethylene glycol monomethyl ether and the alkylated carboxyalkyl chitosanare in reaction so as to obtain the polyethylene glycol monomethyl ether grafted alkylated carboxyalkyl chitosan. The chitosan type natural high-molecular compounds are used as raw materials, therefore, the crude oil demulsifier has the advantages of wide raw material sources, being natural, non-toxicity, good biocompatibility and being degradable. Carboxyalkyl, alkyl and polyether side chains areintroduced to chitosan molecular chains, and by controlling the positions and degree of substitution of the substituents, a series of efficient demulsifiers suitable for O / W type emulsion can be obtained.

The invention relates to a chitosan crude oil demulsifier and a preparation method thereof. A structure general formula of the demulsifier is as shown in formula I, and the preparation method thereofcomprises the following steps: 1) performing acylation modification on chitosan, to obtain N-acylated chitosan; 2) performing epoxidation modification on a terminal hydroxyl of methoxypolyethylene glycol, to obtain epoxidation methoxypolyethylene glycol; 3) enabling the modified methoxypolyethylene glycol to react with N-acylated chitosan, to obtain methoxypolyethylene glycol grafted N-acylated chitosan; and 4) performing carboxy alkylation modification on the methoxypolyethylene glycol grafted N-acylated chitosan, to obtain a target product of methoxypolyethylene glycol grafted N-acylated carboxy alkyl chitosan. The demulsifier is capable of using chitosan natural macromolecular compounds as raw materials, and has the advantages of wide source, nature, non-toxicity, good biocompatibility,degradation and the like. A carboxy alkyl, an acyl and a polyether side chain are introduced into a chitosan molecular chain, and through controlling a position and a substitution degree of each substituent group, a series of the efficient demulsifiers suitable for oil-in-water (O / W) emulsion is obtained.

The invention relates to a modified crude oil demulsifier and a preparation method thereof. The structural general formula of the demulsifier is shown as formula I; the preparation method comprises the following steps: 1) performing alkylation modification on chitosan to obtain alkylated chitosan; 2) performing carboxyl alkylation modification on the alkylated chitosan to obtain alkylated carboxylalkyl chitosan; 3) performing epoxidation modification on polyethylene glycol monomethyl ether to obtain epoxidation modified polyethylene glycol monomethyl ether; 4) enabling the modified polyethylene glycol monomethyl ether to react with the alkylated carboxyl alkyl chitosan to obtain polyethylene glycol monomethyl ether grafted alkylated carboxyl alkyl chitosan. With chitosan type natural high-molecular compounds as raw materials, the modified crude oil demulsifier provided by the invention has the advantages of wide source, natural property, no toxicity, high biocompatibility, degradability and the like. A series of efficient demulsifiers suitable for oil-in-water (O / W) type emulsion are obtained by introducing carboxyl alkyl, alkyl and polyether side chain to a chitosan molecular chain and controlling the position and substitution degree of each substituent.