The method of obtaining the demulsifier

 

(57) Abstract:

The invention can be used in the preparation of oil and water emulsions for deep dehydration and desalting stable oil emulsions. The method of obtaining the demulsifier for dehydration of petroleum emulsions is that block copolymers of ethylene oxides and propylene average molecular weight of 4200.E. is subjected to condensation with the modifying agent, which is used or dibasic adipic acid or phthalic anhydride, in a molar ratio of block copolymers:the modifying agent is 1: (0.5 to 1.2). The condensation product is mixed with an organic solvent, which is used as a low molecular weight alcohol or aromatic hydrocarbon, or a mixture thereof, in the following ratio, wt.%: the condensation products of 30-60; solvent 40-70. As solvent a mixture of the following composition, wt.%: low molecular weight alcohol 10-90; aromatic hydrocarbon 10-90. The technical result - increasing the effectiveness of the demulsifier, resulting in the number of separated water from the emulsion oil - water reaches of 98.2% (degree of dehydration). 1 C.p. f-crystals, 1 table.

The invention from which varovanie and sustainable desalination of oil emulsions.

A method of obtaining the demulsifier by mixing anionic wetting SV-102 on the basis of sodium bis(2-ethylhexyl)succinycholine and neinogennye oil-soluble demulsifier, taken in a mass ratio of 1:(1,25-2,5) at the stage of preliminary discharge of produced water and (1,25-2,5):1 at the final stage of dehydration and desalting of crude oil (ed. mon. 1715824, CL 10 G 33/04, 1989).

However, obtained this way, the demulsifier is ineffective in breaking petroleum emulsions with high aggregate stability.

Closest to the claimed object is a method for demulsifying agent in the form of 50-55% aqueous-methanolic solution neinogennye of blockcopolymer ethylene oxide and propylene, which represents a copolymer of average molecular weight of 4200 containing 27-31 hydroxyethyl links and 48-55 groups of propylene oxide with the trade name "Laprol 4202-2B-30", manufactured according to THE 2226-039-05766801-95. The resulting demulsifier has a trademark "Reapon-4B" and produced according to TU 2226-005-10488057-94. The commodity form is a 50-55% solution of the copolymer in an organic solvent (patent 2091435, CL C 10 G 33/04, publ. 1997).

Disadvantages - received crawlto at improving the efficiency of demulsifier.

This is achieved in that in the method of obtaining the demulsifier for dehydration and desalting oil emulsion by dissolving blockcopolymer ethylene oxide and propylene, the latter is subjected to condensation with the modifying component, which is used as the anhydride of dibasic acid or very acid.

The obtained modified block copolymers of ethylene oxide and propylene (condensation product) is dissolved in an organic solvent in the following ratio, wt.%:

The product of condensation - 30 - 60

Solvent - 40 - 70

The organic solvent used low molecular weight alcohol or aromatic solvent, or a mixture in the following ratio, wt.%:

Alcohol - 10 - 90

The organic solvent is 10 to 90

The method is as follows.

The estimated amount of the base product is loaded into a reactor equipped with a stirrer and jacket heating. The reactor is heated to 80-150oWith, mainly to 1105oC. When operating the mixer portions loaded the estimated amount of the modifying component. The mixing is carried out for 3-20 hours engaged in a viscous liquid from light yellow to yellow color, dissolved in an organic solvent in the following ratio, wt.%:

The product of condensation - 30 - 60

Solvent - 40 - 70

As the base product use block copolymers of ethylene oxide or propylene average molecular weight of 4200 containing 25-33 hydroxyethyl links and 45-55 groups of propylene oxide, sold under the trade name "Laprol 4202-2B-30" on THE other 2226-039-05766801-95.

As the modifying component using phthalic anhydride according to GOST 6341-75 or adipic acid according to GOST 10558-80.

By the aforementioned technologies were obtained demulsifiers for examples 1-7, 8-14, 15-21.

Example 1. In laboratory conditions to prepare 10% solution of demulsifier in toluene or isopropyl alcohol. Samples of commercial emulsion with 60-80 wt.% oil content is poured into 50 ml of lagoons. The demulsifier is injected into the oil microspaces. Dose of emulsifier depends on the specified reagent consumption. Sump with oil and demulsifier is stirred in a laboratory shaker for 10 min with a stroke rate not less than 120 times per minute and placed in a water bath with a given temperature. The amount of separated water is determined after 0.5, 1, 2 and 4 hours.

Dewatered Sparta Dean-stark in accordance with GOST 2477-65 "Petroleum products. Method of quantitative determination of water".

The content components of demulsifier, their ratio, and the results are given in the table, and in examples 1-7 studies have been conducted on coal oil Sergius field "Bashneft" (watering 51%) at a temperature of sludge 8oIn examples 8-14 - Tournaisian oil Meleuz field "Bashneft" (watering 42%) at a temperature of sludge 9oIn examples 15-21 - a mixture of Devonian and Carboniferous oil made by Deposit in a ratio of 1:1, representing a stable emulsion, stabilized iron sulfide at a temperature of sludge 20oC.

In addition, each of the above types of oil was investigated demulsifier the prototype (see examples 7, 14, 21). The data are summarized in table.

As can be seen from the table obtained by the proposed method demulsifiers have a higher efficiency compared with the emulsion obtained by the method prototype. So, when using an emulsifier obtained by the proposed method, the number of separated water in the oil Sergius field is 72,6-97,1% (33,3-48,3% - in the prototype), oil Meleuzovskij is the totype).

1. The method of obtaining the demulsifier for dewatering oil emulsion based blockcopolymer oxides of ethylene and propylene and solvent, characterized in that the block copolymers average molecular weight of 4200. that is, is subjected to condensation with the modifying agent, which is used or dibasic adipic acid or phthalic anhydride, in a molar ratio of block copolymers: the modifying agent is 1: (0.5 to 1.2), and condensation product is mixed with an organic solvent, which is used as a low molecular weight alcohol or aromatic hydrocarbon or a mixture thereof, in the following ratio, wt. %:

The product of condensation - 30 - 60

Solvent - 40 - 70

2. The method according to p. 1, characterized in that the solvent used mixture of the following composition, wt. %:

Low molecular weight alcohol - 10 - 90

Aromatic hydrocarbon - 10 - 90

 

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FIELD: crude oil treatment.

SUBSTANCE: to oil emulsion is added surface-active demulsifying additive containing (i) aqueous solution of surfactant based on sodium salt of oxyethylated isononylphenol carboxymethylate expressed by general formula C9H19-C6H4-O-(-CH2-CH2O)nCOONa, where n=10-12, (ii) self-emulsifying organosilicon compound, and (iii) sodium or calcium chloride salt.

EFFECT: increased demulsifying power.

1 tbl, 13 ex

FIELD: composition for crude oil treatment in oil producing and oil refinery industry.

SUBSTANCE: claimed composition is obtained by mixing of four components. Oxyethylated isononylphenone sodium carboxymethylate of formula C9H19-C6H4-O-(-CH2-CH2O)nCOONa, where n = 12 is used as an active ingredient. Silicone is introduced in composition as self-emulsifying addition, and aqueous or aqueous-salt solution is used as solvent. Composition contains (mass %) oxyethylated isononylphenone sodium carboxymethylate 25-35; self-emulsifying silicone addition 0.01-1.0; calcium chloride 0-25; and as balance: water.

EFFECT: composition with high demulsifying action and reduced foaming formation in crude oil emulsion.

2 ex, 1 tbl

FIELD: crude oil treatment.

SUBSTANCE: invention is directed to treatment of crude oil before processing by destroying persistent oil-water emulsions, dehydration thereof, and desalting with various-purpose demulsifier. Preparation of the latter involves preliminary oxypropylenation of nitrogen-containing compound (etylenediamine, tetramethylenediamine, hexametylenediamine, or polyethylene-polyamine) on heating. Resulting mixture is subjected to further oxypropylenation and then oxyethylenation in presence of alkali catalyst on heating. Thus obtained demulsifier is finally dissolved in solvent at weight ratio (45-55):(55-45).

EFFECT: increased efficiency in destruction of oil-water emulsion and in removal of petroleum products from waste waters accompanied by good corrosion protection and anti-deposits effect.

2 cl, 3 tbl, 20 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to pre-processing treatment of crude oil, in particular to dehydration and desalting of oil before transferring it into collection and transportation system for paraffin-rich oils. Invention provides for preparation of efficient formulation , which contains 20-75% of glycerol-based ethylene oxide/propylene oxide block copolymer, 2-10% of nonionic surfactant ("Dossolvan"), additionally 4-20% of product obtained by reaction of above block copolymer with toluene diisocyanate, 0.5-2.5% of oxyethylated fatty acid-based amine ("Oksamin-15") or product of reaction thereof with phosphorus-containing compound ("Oksamin-F 15"), and solvent to 100%.

EFFECT: increased efficiency in protection of oil-field equipment against corrosion and asphaltene-tar-paraffin deposits and enabled and enabled simultaneous treatment of waste water to remove oil derivatives.

2 tbl, 16 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to pre-processing treatment of crude oil, in particular to dehydration and desalting of oil with the aid of surfactant additives. Composition of invention contains 15-17% glycerol-based ethylene oxide/propylene oxide block copolymer, 5-15% oxyethylated glycerol/toluene diisocyanate reaction product, additionally oxyethylated fatty acid-based amine ("Oksamin-15") or product of reaction thereof with phosphorus-containing compound ("Oksamin-F 15"), and solvent to 100%.

EFFECT: increased efficiency in protection of oil-field equipment against corrosion and asphaltene-tar-paraffin deposits and enabled and enabled simultaneous treatment of waste water.

2 tbl, 16 ex

FIELD: crude oil treatment.

SUBSTANCE: objective of invention is treatment of crude oil before processing, in particular dehydration, desalting of oil, destruction of water-oil emulsions, and improvement of rheological properties to facilitate transportation of oil through crude oil lines. Composition contains 25.0-55.0% of nonionic demulsifier, notably ethylene oxide/propylene oxide block copolymer based on monoethylene glycol with average molecular mass 4300, 5.0-75.0% of diethylene glycol production distillate (including 20.0-40.0% ethylene glycol methyl ether, 30.0-60.0% diethylene glycol methyl ether, 2.0-5.0% methanol, and 15.0-18.0% water), and solvent, preferably methanol (to 100%).

EFFECT: enhanced oil dehydration and desalting efficiency and improved rheological properties of oil.

1 dwg, 2 tbl

FIELD: crude oil treatment.

SUBSTANCE: polymer-containing trapped emulsion is pumped from earthen container into settler containing fresh industrial water to obtain emulsion-to-water volume ratio 1:2. Resulting mix is heated via circulation through heat-exchange to 70-80°C while simultaneously receiving demulsifier in amount 20-50% of its estimated amount and aqueous solution of active chlorine-releasing compound in amount corresponding to 0.2-0.4 kg active chlorine per 1 m3 trapped emulsion. Hot trapped emulsion is then pulped to section of dispersers disposed in tubes supplying fresh industrial water preheated to 40-50°C while simultaneously feeding the rest of demulsifier to pump pumping trapped emulsion observing emulsion-to-water volume ratio (1-2):9. Dispersing cycle is repeated at least twice while draining after each cycle separated water. Finally, inverted emulsion is settled to residual water content 1%.

EFFECT: increased emulsion destruction efficiency due to increased degree of oil dehydration and lowered concentration of suspended impurities.

2 ex

FIELD: chemical technology.

SUBSTANCE: invention relates to agents used in destruction of aqueous-petroleum emulsions and can be used in dehydrating petroleum in industrial units in petroleum preparing. The composition for destruction of aqueous-petroleum emulsions and treatment of sewage waters comprises dimethyl phosphite, nitrogen-containing compound, non-ionogenic surface-active substance, Phosphenox H-12, solvent and alkylbenzene sulfoacid in the following ratio of components, wt.-%: dimethyl phosphite, 0.01-2.0; nitrogen-containing compound, 0.2-2.0; non-ionogenic surface-active substance, 25.0-70.0; Phosphenox H-12, 1.0-15.0; alkylbenzene sulfoacid, 0.1-15.0, and solvent, the balance. Invention provides the development of effective de-emulsifying agent of aqueous-petroleum emulsion showing the complex effect for high-viscous oils.

EFFECT: improved and valuable properties of composition.

3 tbl, 20 ex

FIELD: crude oil treatment.

SUBSTANCE: oil emulsion is preliminarily separated from drainage water and, after addition of demulsifier, oil desalting process is carried out by washing moving emulsion under dispersing conditions with a washing fluid in at least two steps. Volume of washing fluid added in the first desalting step is larger than that in the second step by a factor of 2.0-2.5. Washing fluid is notably 3-10% aqueous sodium nitrate solution, which is preheated before addition to at least 45°C in both desalting steps. In the first step, oil is subjected to hot settling preferably for 2 h and, in the second step, 3 h. Demulsifier utilized is based on oil-soluble surfactants added in amounts 25 to 55 g/t.

EFFECT: reduced consumption of demulsifier at higher degree of desalting, in particular for oils with high level of chlorides.

7 cl, 2 ex

FIELD: petroleum extracting and petroleum processing industry.

SUBSTANCE: invention relates to preparing petroleum-soluble composite possessing high demulsifying effect. The composite is prepared by simple components mixing. As an active base the composite comprises sodium salt of oxyethylated isononylphenol carboxymethylate with the oxyethylation degree value 10-12. As a low-temperature solvent the composition comprises methanol-aldehyde fraction (waste in production of butyl alcohols) and water in the following ratio of components, wt.-%: oxyethylated isononylphenol carboxymethylate sodium salt, 45.0-55.0; methanol-aldehyde fraction, 43.5-50.0, and water, the balance, up to 100. Invention provides high demulsified capacity of the composition with low solidification point.

EFFECT: improved and valuable properties of composite.

2 ex

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