RU2367682C1 - Mixture for deep dehydration and desalination of water-oil emulsions - Google Patents

Abstract

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to a mixture for deep dehydration and desalination of a water-oil emulsion, which contains a block copolymer of ethylene and propylene oxides and a solvent. The ethylene block copolymer and propylene oxides are in form of polyether, obtained from polymerisation of propylene oxide with glycerin or glycol with subsequent copolymerisation with ethylene oxide, with molecular weight of 4000-6000, and additionally polyoxypropylene polyol with molecular weight of 50000-300000. The solvent used is either C₁-C₃ alcohol or an aromatic hydrocarbon with the following ratio of components, wt %: polyether 5-50; polyoxypropylene polyol 3-40; solvent - the rest.

EFFECT: mixture has high demulsifying activity in a wide temperature range.

4 ex, 2 tbl

Description

The invention relates to the field of preparation and processing of oil, and in particular to means for deep dehydration and desalination of oil-water emulsions, and can be used for dehydration of oil.

A well-known demulsifier based on a mixture of two block copolymers - hydroxyethylated and hydroxypropylated propylene glycol or ethylene glycol and hydroxypropylated and hydroxyethylated alcohol (Standing production schedule for production of Reapon-4 V, TU 6-5554-91).

Known demulsifier, including a block copolymer of propylene and ethylene oxides based on glycols, obtained in the presence of an alkaline catalyst when heated (RF Patent No. 2078095, C10G 33/04, 1997)

A known demulsifier comprising a block copolymer of ethylene and propylene oxides based on glycerol with the number of units of ethylene oxide 1-40 and propylene oxide 60-140, with a molecular weight of 4000-10000 cu, which are obtained in a known manner by reaction in the presence of an alkaline catalyst and when heated (US Patent No. 3699051, MKI B01 17/04, 1974; N. Schenfeld "Surfactants based on ethylene oxide", Moscow, Chemistry, 1982, 752 S.)

Known demulsifiers exhibit good demulsifying efficacy, but are used at high temperatures and for a long settling time.

The closest in chemical essence is a demulsifier for the destruction of water-oil emulsions containing block copolymers obtained by oxyalkylation of ethylene diamine with ethylene oxide and propylene oxide in the presence of an alkaline catalyst when heated (AS USSR No. 171065, C10G 33/04, 1965), having commercial the name "Diproxamine-157." Diproxamine-157 is used in the form of a 65% methanol solution and has the trade name "Diproxamine 157-65M" (TU 6-14-19-675-86). The demulsifier Diproxamine-157 was adopted by us as a prototype, since it is obtained by sequential polymerization of ethylene diamine first with ethylene oxide and only then with propylene oxide, unlike most industrial block copolymers.

The task of the invention is the development of a demulsifier that contributes to the destruction of highly watered oil emulsions at low temperatures (0-15 ° C) and deep dehydration and desalination of oils in preparation (20-60 ° C).

The problem is solved in that the composition for deep dehydration and desalting of water-oil emulsions containing a block copolymer of ethylene and propylene oxides and a solvent contains a polyether obtained as a block copolymer of ethylene and propylene oxides obtained by polymerization of propylene oxide with glycerol or glycol, followed by copolymerization with , with a molecular weight of 4000-6000, and additionally polyoxypropylene polyol, with a molecular weight of 50000-300000, in the following ratio of components, wt.%:

simple polyester 5-50; polyoxypropylene polyol 3-40; solvent rest.

In a variant of the composition according to claim 1 further comprises an aminoxyalkylate in the following ratio of components, wt.%:

simple polyester 5-50; polyoxypropylene polyol 3-40; aminoxyalkylate 0.5-20; solvent rest.

As polyethers can be used, for example, polymers of ethylene and propylene oxides based on glycols and glycerol, or mixtures thereof:

Polyester 4202-2B-30 (TU 2226-039-05766801-95) is a simple polyester obtained by polymerization of propylene oxide and glycol, followed by block copolymerization with ethylene oxide.

Laprol 5003-2B10 (TU 2226-023-104V8057-95) is a simple polyester obtained by polymerization of propylene oxide and glycerol, followed by block copolymerization with ethylene oxide.

Laprol 5003-2-15 (TU 2226-006-10488057-94) is a block copolymer obtained by alcoholate polymerization of propylene and ethylene oxides with glycerol.

Laprol 6003-2B-18 (TU 2226-020-10488057-94) is a simple polyester obtained by alcoholate polymerization of glycerol with propylene oxide followed by block copolymerization with ethylene oxide.

Laprol 4503 is a polyether obtained by alcoholate polymerization of propylene oxide with glycerol, molecular weight 4500.

As a solvent, alcohols can be used, for example, methyl (GOST 2222-95), ethyl (GOST 18300-87), isopropyl (GOST 9805-84), or mixtures thereof with water; aromatic solvents: toluene (GOST 5789-78), ethylene benzene fraction (TU 6-01-10-37-78), butyl benzene fraction (TU-2411-034-05757601-94), nefras AR 120/200 (TU 38-101809 -90) and Nefras AR 130/150 (GOST 10214-78), xylene fraction (GOST 9410-78 for xylene); ethylene glycol monoethyl ether (TU 6-09-3222-79), diethylene glycol monoethyl ether (TU 6-01-575783-6-89), ethylene glycol monobutyl ether or mixtures thereof and mixtures with water.

As the polyoxypropylene polyol, polyoxypropylene polyols with a molecular weight of 50,000-300,000 based on ethylene glycol, diethylene glycol, propylene glycol, glycerin, sorbitol, sucrose (maltose, lactose, sucrose) are used.

To obtain polyoxypropylene polyol, glycol, polyglycol, sorbitol, or sugars (maltose, lactose, sucrose) are used as the starting system, and under conditions of alkaline catalysis, hydroxypropylation is carried out at a temperature of 90-100 ° C, the initial adduct obtained with a molecular weight of 1000-5000 depending on from the source, subsequently hydroxypropylated with the addition of a catalyst at a temperature of 60-80 ° C until the propylene oxide is fully activated and a molecular weight of 50000-300000 is obtained.

The interaction products are highly viscous liquids and glasses from colorless to brown, miscible with organic solvents in any proportions, slightly dispersed in water.

The composition contains Dissolvan 5022-1 as an aminoxyalkylate (Passport from Clariant Germany).

Compositions for the destruction of water-oil emulsions are prepared by simple mixing of the components at a temperature of 20-40 ° C.

Example 1

To 37.5 g of Laprol 4202-2B-30SCH, 12.5 g of ethylene glycol-based polyoxypropylene polyol with a molecular weight of 50,000 and 50 g of methyl alcohol are added. Mix thoroughly at a temperature of 20-40 ° C until smooth.

Examples 2 and 3 are prepared analogously to example 1.

Example 4

To 35 g of Laprol 6003-2B-18 add 10 g of ethylene glycol-based polyoxypropylene polyol with a molecular weight of 50,000, 5 g of aminoxyalkylate and 50 g of methyl alcohol. Mix thoroughly at a temperature of 30-40 ° C until smooth.

Preparation of the remaining samples is carried out analogously to example 1 and 4 (see table 1).

The resulting compositions are liquids from light yellow to light brown in color.

The demulsifying activity of the reagents was tested on a real Devonian oil emulsion of 75% water cut taken from the Romashkinskoye field. The determination of the residual water content in oil was carried out in accordance with GOST 14870-77 by the Dean-Stark method. The test results are presented in table 2.

As can be seen from the data presented in table 2, the proposed composition has a high demulsifying activity in a wide temperature range.

Table 2. p / p Examples from Tab. 1 and comparison reagent Dynamics of water sludge,% Residual water,% 60 min, 5 ° C 120 min, 10 ° C 180 min, 30 ° C 240 min, 40 ° C one. one 53 86 94 99 0.06 2. four 58 88 95 98 0.18 3. 9 46 76 91 98 0.12 four. 12 56 84 93 99 0.06 5. fifteen 48 78 95 98 0.21 6. 17 46 77 94 99 0.06 7. 23 44 73 96 99 0.09 8. 25 45 76 94 98 0.12 9. 29th 55 86 92 98 0.18 10. 33 56 87 91 98 0.21 eleven. 35 56 86 93 99 0.06 12. 37 54 83 94 99 0.09 13. 41 49 80 96 98 0.12 fourteen. 43 35 89 98 99 0.09 fifteen. 45 fifty 81 94 99 0.06 16. 49 51 83 88 98 0.15 17. 52 53 84 86 99 0.06 eighteen. 58 45 55 98 99 0.06 19. 60 61 89 84 98 0.60 twenty. Diproxamine-157 38 48 70 89 11.60

Claims (2)

1. Composition for deep dehydration and desalting of an oil-water emulsion, including a block copolymer of ethylene and propylene oxides, a solvent, characterized in that as a block copolymer of ethylene and propylene oxides it contains a simple polyether obtained by polymerization of propylene oxide with glycerol or glycol during subsequent copolymerization with with a molecular weight of 4000-6000 and an additional polyoxypropylene polyol having a molecular weight of 50000-300000, and as the solvent composition comprises an alcohol or c ₁ -C _3, or aromatic hydrocarbon minutes at the following component ratio, wt.%:
simple polyester 5-50 polyoxypropylene polyol 3-40 solvent rest 2. The composition according to claim 1, characterized in that it further comprises an aminoxyalkylate in the following ratio of components, wt.%:
simple polyester 5-50 polyoxypropylene polyol 3-40 aminoxyalkylate 0.5-20 solvent rest