DD298806A5 - DEMULGATOR FOR THE CLEAVING OF PETROLEUM ELEMENTS BASED ON OLIGOESTERS OF AMINOPOLYETHERALCOCOOLS WITH DICARBONE ACIDS - Google Patents

Abstract

The invention relates to a demulsifier for the separation of Erdoelemulsionen, which is effective at temperatures below 60C and allows a high initial gap speed. The demulsifier consists of a statistical mixture of oligoesters of aminopolyether alcohols with dicarboxylic acids. {Demulsifier; Erdoelemulsion; Demulsification; Dicarbonsaeureoligoester; Aminopolyetheralkohol; Demulsification temperature; Emulsion splitting speed; Demulgatorgemisch}

Description

Field of application of the invention

The invention relates to demulsifiers for the cleavage of petroleum emulsions based on oligoesters of aminopolyether alcohols with dicarboxylic acids for the cleavage of petroleum emulsions.

Characteristic of bekannton state of the art

In the extraction of oil from underground deposits, petroleum emulsions are promoted to a considerable extent. By natural emulsifiers contained in petroleum, e.g. Naphthenates and other surfactant compounds stabilize these emulsions. Metal sulfides and clays or other finely divided mineral constituents present in petroleum also stabilize these emulsions.

For a technical processing of the petroleum, the splitting of these primary promoted emulsions is necessary. In slitting plants, the emulsions are split in the temperature range of 20 "C-85 ^o C with the addition of 10-300 ppm of surfactants, demuigators The separated substantially salt- and water-free crude oil is then supplied as so-called commercial petroleum for processing in the refineries.

It is in the nature of the matter that the stabilization of the petroleum emulsions takes place in the most varied ways according to the geological conditions of the petroleum deposit and the chemical composition of the petroleum. Accordingly, various demulitators are necessary for working up the petroleum, since a special demulsifier does not effectively split each petroleum emulsion.

In particular, the nonionic surfactants have been proven for this purpose.

Oxyethylene-oxypropylene block copolymers, mixtures of water-soluble and -insoluble polyalkylene glycols which have been reacted with aliphatic or aromatisechen diisocyanates, are known from DE-PS 1127082 and DE-PS 1495827. U.S. Patent Nos. 3,206,214 and 3,202,615 refer to common reaction products of oxyethylene-oxypropylene block copolymers or alkylphenol resin oxalkylates with dicarboxylic acids or their anhydrides, such as diglycolic acid and maleic anhydride. Oxalkylates of N, N "-tetra- (5-oxypropylpropyol) -N '- (2-oxypropyl) -diethylenetriamine are described in DD-PS 151175. In DD-PS 229136 a method for dewatering and desalination of petroleum under The use of oligomers of alpha-methylstyrenediol or its polyglycol ethers is described Diurethanes of the general formula

R ₁ : aromatic, aliphatic or cycloaliphatic radical having at least 6C atoms a: 10 to 40 oxypropylene units

b: 5 to 45 oxyethylene units

b / a: 0.3 to 1.9

R ₂ : 4 to 12 C atoms

mean are described in DD-PS 231948 as an effective demulsifiers at 3O ⁰ C. In DE-PS 2 434545 mixtures of alkoxylated phenolic resins, glycol esters, polyols, polyalkylene glycols, alkyl / arylsulfonates, oxalky profiled amines or short-chain dicarboxylic acids and high molecular weight polyols with alkyl ether sulfates are mentioned as emulsion breaker. Polyimines of various structures are mentioned as demulsifiers, for example in DE-PS 3404538, DE-PS 2227 546 and DE-PS 2719978. According to DE-PS 3404538 a polyimine of the structure

H - {- CH ₂ -CH _z -NH -) .- {- CH ₂ -CH _r -N-) _b -H

X = - (- CHj-CHj-NH-lc-H

a and b are independently 0 to 600, a + b = 50 to 600

c = 0 to 60

is with an alkylating agent of structure A-Z-A

Z = direct bond or C _n Hj _n -

A = -CH ₂ -Y

Y = Cl, Br, J, OH, sulphonyloxy radical

is reacted and used the reaction product for the separation of oil waste water steam-flooded oil deposits. In a large number of patents, alkoxylated formaldehyde resins, their mixtures or their subsequent reaction products with diisocyanates are described as effective demulsifiers (DE-PS 2445873, DE-PS 3223629, DE-PS 3223691, DE-PS 1642825). The demulsifiers according to the prior art adhere to the disadvantages that they either insufficiently split at temperatures below 6O ⁰ C, they can be produced only after elaborate syntheses or the economy of their production is reduced by low space / time yields.

Object of the invention

The aim of the invention is to provide oligoesters of aminopolyether alcohols with dicarboxylic acids for the cleavage of petroleum emulsions which do not have the disadvantages of the demulsifiers according to the prior art.

Explaining the nature of the invention

The invention has for its object to develop demulsifiers for the cleavage of petroleum emulsions from the basis of oligoesters of aminopolyether alcohols with dicarboxylic acids, which split at temperatures below 6O ⁰ C petroleum emulsions and have a high initial cracking speed.

According to the invention the object is achieved in that the demulsifier of a random mixture of compounds of structure I.

R ₁ -QR ₂

R2

Q = N-CH ₂ CH ₂ -N-CH ₂ CH ₂ -N

^R 2

Ri = - (C ₃ H _e O-) _y - (C ₂ H 4 O-) _x - (- CO-R-COO- (C j H 4 O-) _x - {C ₃ H _e O-) _y -Q-) _I - HR * = (C ₃ H _e O-) _v - (C ₂ H ₄ O-) _x -H

χ = 6 to 20

y = 3 to 25

ζ = on a statistical average 2

R = -CH = CH-, phenylene radical

is, which is optionally present in solution.

Products of this composition are effective demulsifiers, which cause the destruction of the crude oil emulsions even at split temperatures of 20 ° C. It is a particular advantage of these oligomeric demulsifiers that they split the crude oil emulsions after a short reaction time. Another advantage is that the more oleophilic products do not favor the solubilization of Frdöl in salt water separated from the emulsion and thus an environmentally friendly technology is easier to implement.

embodiments

The demulsifying power of the described demulsifiers according to the invention was tested on artificial remulsions of chemically untreated crude oil and salt water. The salt water content of the remulsions can be found in the example given. The demulsifiers were used as 1% solutions in xylene / isopropanol (3: 1). The practical implementation was analogous to the bottle test. The following demulsifiers were tested:

No. Composition of the compounds of structure I

1 χ = 10, y = 10, r = 20, s =

2 x = 6, y = 5, r = 15, s =

3 χ = 18, y = 22, r = 25, s =

4 χ = 12, y = 16, r = 18, s =

5 χ = 14, y = 12, r = 21, s =

To better explain the demulsifiers according to the invention were some polyether alcohols of the type Il ^R l ^R 2

R ₃ R ₄

R, to R ₆ = - (- χ = 6 to 20

y = 3 to 25 and which are an initial component of the demulsifiers, additionally included in the tests:

6 χ = 6, y =

7 χ = 18, y =

8 χ = 12, y = 16

Investigations carried out: split test A

Petroleum No.6.35VoI .-% Saltwater content, Demulsifier concentration 60ppm, Fissure temperature 20 ° C Product-No .: Fractional result in%

10 min 0, bh 1h

39 55 82 45 64 81 42 71 88 38 58 71 46 63 90 0 0 1 0 0 2 0 1 3

Claims (1)

Demulsifier for cleaving petroleum emulsions based on oligoesters of aminopolyether alcohols with dicarboxylic acids, characterized in that it consists of a random mixture of compounds of structure I R ₁ -QR ₂ R2 R ₂ Q = N-CH ₂ CH ₂ -N-CH ₂ CH ₂ -N ^ ^R 2 R ₁ = (C ₃ H6O-) _y - (C ₂ H4O-) _x - (- CO-R-COO- (C ₂ H4O-) _x - (C ₃ H ₆ O-) _y -Q-) _z - HR ₂ = (C ₃ H ₆ O-) _y - (C ₂ H ₄ O-) _x -H χ = 6 to 20 y = 3 to 25 ζ = on a statistical average 2 R = -CH = CH-, phenylon radical
is
consists.