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596results about "Dewatering/demulsification with chemical means" patented technology

Preparation method for chitosan natural polymer modified crude oil desalting demulsifier

ActiveCN106188552ALimited demulsibilityIntensify the degree of emulsificationDewatering/demulsification with chemical meansQuaternary ammonium cationNon toxicity
The invention relates to a preparation method for a chitosan natural polymer modified crude oil desalting demulsifier. The method comprises the following steps: 1) modifying polyethylene glycol monomethyl ether by halogenating; 2) preparing glycidyl dimethyl alkyl ammonium chloride; 3) preparing quaternized carboxy alkyl chitosan; 4) causing the modified polyethylene glycol monomethyl ether to react with the quaternized carboxy alkyl chitosan, thereby obtaining a target product, polyethylene glycol monomethyl ether grafted quaternized carboxy alkyl chitosan. According to the invention, the chitosan natural high-molecular compound is taken as the raw material and has the advantages of wide resource, naturality, non-toxicity, sustainability, excellent biological compatibility of products, degradability, and the like. The demulsifier prepared according to the invention has excellent demulsification dewatering effect; the molecule of the demulsifier contains a large amount of carboxy alkyl groups and quaternary ammonium salt groups and the electronegative ions, including metal cation, naphthene acid radicals, and surfaces are electronegative grains and have strong combining capacity, so that the demulsifier has the capacities of demulsifying while removing oil-soluble salt.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Preparation method of polyether-grafted chitosan derivative crude oil desalting demulsifier

The invention relates to a preparation method of a polyether-grafted chitosan derivative crude oil desalting demulsifier. The preparation method comprises the following specific steps: firstly, performing formylation modification on polyethylene glycol monoethylether; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternarization carboxyalkyl chitosan; fourthly, enabling formylation modified polyethylene glycol monoethylether to react with carboxy alkyl chitosan to obtain the polyether-grafted chitosan derivative crude oil desalting demulsifier. The polyether-grafted chitosan derivative crude oil desalting demulsifier disclosed by the invention is prepared by taking chitosannatural polymeric compounds as raw materials, and has the advantages of wide sources, naturalness, no toxicity, sustainability, good biocompatibility of a product, degradability and the like. The prepared demulsifier is good in demulsifying and dehydrating effect; meanwhile, a demulsifying molecule contains a large amount of carboxyalkyl groups and quaternary ammonium salt groups which have strong combining capacity to metal cation, ions with negative electricity such as naphthenic acid radicals as well as particles of which the surfaces are electronegative, so the polyether-grafted chitosan derivative crude oil desalting demulsifier has capacity of removing oil-soluble salts while demulsifying.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Preparation method of efficient crude oil desalting demulsifier

The invention relates to a preparation method of an efficient crude oil desalting demulsifier. The preparation method comprises the following specific steps: (1) performing isocyanic acid esterification modification on methoxy polyethylene glycol; (2) preparing glycidyl dimethyl alkylammonium chloride; (3) preparing quaternized carboxyalkyl chitosan; (4) modifying the methoxy polyethylene glycol and the quaternized carboxyalkyl chitosan for reaction to obtain a target product, namely, methoxy polyethylene glycol-grafted quaternized carboxyalkyl chitosan. By taking chitosan type natural macromolecular compounds as raw materials, the efficient crude oil desalting demulsifier has many advantages of wide availability, nature, nontoxicity, sustainability, high biocompatibility, degradability and the like. The prepared demulsifier is good in demulsifying and dehydration effect; meanwhile, molecules of the demulsifier contain a large quantity of carboxy alkyl groups and quaternary ammonium salt groups, so that the demulsifier is extremely high in combination capacity for negatively charged ions such as metal cations and naphthenic acid radicals, and particles with electronegativity on the surfaces, and can remove oil-soluble salt during dehumidification.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Method for preparing comb-shaped polymer crude oil desalting demulsifier

ActiveCN106117562ALimited demulsibilityIntensify the degree of emulsificationDewatering/demulsification with chemical meansHydrocarbon oils treatmentPolymer scienceQuaternary ammonium cation
The invention relates to a method for preparing comb-shaped polymer crude oil desalting demulsifier. The method comprises the following steps: (1) performing acrylatioed modification on methoxy polyethylene glycol; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternized carboxyalkyl chitosan; (4) reacting modified methoxy polyethylene glycol with quaternized carboxyalkyl chitosan to obtain the target product demulsifier. The demulsifier is prepared by using chitosan naturalpolymer compounds as raw materials, and has the advantages of wide source, nature, no toxicity, sustainability, good product biocompatibility, degradability and the like. The prepared demulsifier has good demulsification and dehydration effect since the molecular structure is a comb-shaped polymer formed by simultaneously grafting a plurality of linear branched chains on a main chain, and has a strong binding capability on metal cations, naphthenate radicals and other negatively charged ions and particles which are electronegative on surfaces since a great amount of carboxyalkyl groups and quaternary ammonium salt groups on the molecules. Therefore, the demulsifier has capabilities of demulsifying and removing oil-soluble salt.
Owner:WUHAN HYPERBRANCHED POLYMER RESINS SCI& TECH CO LTD

Preparation method of ethidene diamine type polyether demulsifying agent

The invention discloses a preparation method of ethidene diamine type polyether demulsifying agent. The ethidene diamine type polyethers demulsifying agent is prepared by that ethidene diamine serving as a raw material is subjected to crosslinking modification after reacting with ethylene oxide and epoxypropane. The preparation method comprises the following steps: in the presence of base catalyst, causing the ethidene diamine serving as an initiator to react with propylene oxide and ethylene oxide to prepare polyethers demulsifying agent A by two stages; then, in the presence of catalyst, carrying out selfcrosslinking reaction on the polyethers demulsifying agent A by utilizing polycarboxylic acid, thus preparing a product B; and finally, carrying out selfcrosslinking reaction on the polyethers demulsifying agent A and the product B by toluene diisocynate in the solvent, thus preparing the final product of the ethidene diamine type polyethers demulsifying agent. The demulsifying agent prepared by the preparation method has the advantages of higher relative molecular weight, ideal dehydration effect, good broad spectrum and small use amount, and is suitable for demulsifying and dehydrating crude oil in oil fields, and the removed water has good quality.
Owner:JURONG NINGWU CHEM

Aged effluent oil treatment technology used for oil fields and oil refineries

The invention discloses an aged effluent oil treatment technology used for oil fields and oil refineries, which comprises the following steps of: tempering the effluent oil: adding hot water, an emulsion breaker and a cleaning agent in a modulating pot, stirring and heating, standing in the pot, and lifting and pumping from the bottom part to a solid-liquid separation sledge material filter; performing solid-liquid separation: heating the filtered oil water mixture and small particle solid impurities by using a material heater, entering the inlet of a horizontal spiral centrifuge, meanwhile, successively adding a flocculent according to flow, discharging aged oil solid impurity wastes from the solid outlet of the horizontal spiral centrifuge, collecting the separated out solid oil water mixture by a buffer pot, and lifting and pumping to an oil-water separation sledge material inlet by an oil water lifting pump; and performing oil-water separation: finally heating the oil water mixture in an oil water separating pot, standing, settling, entering the separated out crude oil in an oil chamber, and automatically pumping to a crude oil external transportation process by a purified oil lifting pump. By adoption of the treatment technology, the technical problem of difficulty in treating various aged effluent oils which are generated in production process of oil fields and are difficult to treat is likely to be solved.
Owner:北京惠博普能源技术有限责任公司

Method for treating ageing oil of viscous oil

ActiveCN102041038AExact decomposition surfaceDecomposition is achieved accuratelyDewatering/demulsification with chemical meansRotary centrifugesPhenolPetroleum engineering
The invention relates to a method for treating ageing oil of viscous oil, which provides a demulsifier for ageing oil of viscous oil, comprising the following raw materials in weight percent: 0.5-1% phenol, 1.5-2% styrene, 0.5-1% ethyleneamine, 0.5-1% formaldehyde, 0.5-1% catalyst, 40-50% ethylene oxide and 40-50% epoxypropane. The invention further provides a three-phase decanter centrifuger, comprising a differential mechanism, a spiral propeller, a rotary drum, a housing, an engine base, a motor and a feed pipe. The invention further provides a method for treating ageing oil of viscous oil, comprising the following steps of: using the demulsifier to perform demulsification treatment to the ageing oil of the viscous oil, then inputting the ageing oil of the viscous oil after the demulsification treatment in the three-phase decanter centrifuger to centrifuging and separating so as to respectively obtain fatlute, sewage and the oil. The ageing oil, especially the ageing oil of the viscous oil, is treated by adopting the demulsifier to combine with the centrifuging method; the demulsification and dehydration problem of the ageing oil of viscous oil in the oil field is solved, and the requirement of the field production can be satisfied.
Owner:PETROCHINA CO LTD +1
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