SU777051A1 - Composition for dehydrating and desalinization of oil - Google Patents

Description

one

The invention relates to the field of oil preparation and can be used both in field oil treatment plants and in oil refineries in the process of deep dewatering and desalting of oil.

Formulations for the dehydration and desalting of petroleum are known, including an aqueous solution of polyacrylamide (PAA) or mixtures containing a surfactant, sodium silicate, partially hydrolyzed polyacrylamide, and water 1.

However, these compositions do not have a sufficiently high efficiency, and the preparation of an aqueous solution of an AAA of the desired concentration is not a technological procedure in field conditions, especially in winter. To prepare an aqueous solution of PAA, a high-speed mixer with cutting knives is required.

A known composition for the dehydration and desalting of oil, containing the following components, wt. %:

Surface active demulgator0, 03-0.10

Liquid glass0,008-0,128

Polyethylene polyamino polydicarboxylic acid, 003-0.048

Water Else 2.

However, this composition has insufficient efficiency, and the manufacture of polyethylene polyamino polycarbonic acid requires expensive and scarce

5 product - molonic acid.

The aim of the invention is to increase the effectiveness of the applied compositions for deep dewatering and desalting of oil.

10 This goal is achieved by the fact that in a composition for dehydration and desalting of oil, including a surface-active demulsifier, water glass, a polyethylenepolyamine derivative n,

15 as a derivative of polyethylene polyamine contains polyethylene polyamino-N sulfonopionic acid of the formula

| 2-SI2-CH2-K-d

20

 dHg

1100 (5- (iH-JOsH

where n 5-21

25

in the following ratio of components

weight. %:

Surface active

0.03 -0.07

demulsifier 0,008-0,128 Liquid glass

thirty

Polyethylenepolyamino-Nulfopropionic acid0,003-0,048

Water the rest.

Any reagents, both water soluble and oil soluble, can be used as a surfactant demulsifier. The best effect is provided by substances like copolymers, for example, disolvan-4411 and separaol-25. Metasilicate and sodium di-trisilicate can be used as liquid glass. The preferred module ranges from 1 to 3. In the desalting process, the aqueous solution is mixed with the oil. It can dry out by dispensing the proposed composition into the pipeline, in settling tanks with a stirrer, or by passing the oil through a combination of the above composition in tanks. Desalting the proposed composition can be subjected to both crude oil and mixtures of different grades of oils that have undergone primary oil preparation at field gathering points.

Example 1. Desalting is subjected to a viscous, highly paraffinic oil from the Sultangulovskoye-Zaglinskoye field, which has been dehydrated at an oil preparation unit and contains 916 mg / l of chloride salts and water, 0.21 wt. %

Prepare an aqueous solution of the following composition, wt. %:

Disolvan-44110,05

Liquid glass0,064

Oil treatment composition at optimum concentrations

Disolvan-4411, liquid glass, polyethylene polyamino polydicarboxylic acid, water

Disolvan-4411, liquid glass, polyethylene polyamino-M-sulfopropionic acid, water

Prepare an aqueous solution of the following composition, wt. %:

Separol-250,05

Liquid glass0,064

PolyethylenepolyamicHO-N-sulfopropionic acid 0.024 WaterOstal

For comparison, under the same conditions and on the same oil, the efficiency

PolyethylenepolyaminoN-sulfopropionic acid 0,024

Water the rest.

An oil of the same temperature was injected into the solution of the composition heated to 60 ° C and the mixture was stirred in a mixer at 500 rpm for 15 minutes (Un: VK 9 s: 10). After settling under isothermal conditions, an average sample is taken and the analysis of the content of chloride salts (LAS-1) is carried out. For comparison, the effectiveness of the prototype is tested under the same conditions and on the same oil with the following ratios of ingredients, weight. %:

Disolvan-44110,05

Liquid glass0,064

Polyethylenepolyamino polycarbonic acid0.024

Water the rest.

The data obtained are given in table. 1. From the above data it can be seen that the oil obtained after treatment with the proposed composition contains a much smaller amount of chloride salts than in the case of processing the oil with a known composition. The content of chloride salts in the oil, compared with the initial sample, which also passes dehydration by the proposed composition, is reduced by a factor of 54.

Example 2. Desalting is subjected to high-viscous, highly paraffinic oil, which has suppressed dehydration at the oil treatment station and contains 916 mg / l of chloride salts and water, 0.21 wt. %

Table 1

Residual

composition of chloride salts, mg / l

27

17

known composition with slashes x ingredients, weight.

Separol-25 Liquid glass Polyethylenepolyamino polycarboxylic acid Water

Oil treatment is carried out according to the method of example 1.

The results are shown in Table. 2

Composition for treatment at optimum concentrations

Separol-25, liquid glass, polyethylene polyamino polydicarboxylic acid, water

Separol-25, liquid glass, polyethylene polyamino-M-sulfopropionic acid, water

The data show that the oil obtained after processing the proposed composition according to example 2, contains chloride salts 28 times less compared to the original sample.

table 2

Residual

content

composition of chloride salts, mg / l

52 33

The examples at extreme values of the concentrations of the components of the composition with indication of the results are summarized in Table. 3 and 4: in table. 3 shows the data on the known composition, in table. 4 - on the proposed.

Table 3

Polyethylene polyamino - N-sulfopropionic acid was synthesized by the Manpich reaction from polyethylene polyamine (PEPA). According to passport data, PEPA contains elementary links 5-12. The narrower fractions of PEPA, p. 5, 6, 7, ..., 12, are not produced in view of the laboriousness of the process.

Under laboratory conditions, vacuum distillation yielded narrower PEPA subfractions with a degree of polymerization / g 5-4-6,, 94-10, 11h-12. From received Table 4

Compounds used in the present formulation were synthesized. In addition, similar products were obtained from the field product PEPA

the degree of polymerization p-1n-5.

In tab. 5 shows the results of the dehydration and desalting of oil using polyethylene polyamino-L-sulfopropionic acid with various degrees

Claims (2)

polymerization at the top, bottom and optimal ratios of the ingredients of the composition. From the data given in table. 5 it follows that the use of a polymer with a degree of polymerization of p 1n-5 is not advisable due to its low efficiency. The results obtained using the broad fraction are not significantly different from those obtained using narrower subfractions. For this reason, it is assumed that the optimum degree of polymerisation of the polymer is p-5-H-12 using products of a wide fraction. The use of the proposed composition for the dehydration and desalting of oil provides, in comparison with the existing composition, the following advantages: a) allows the technology of oil preparation to carry out deep desalination operations and a higher quality; b) a more affordable polyethylene polyamino M sulfoiropionic acid product is used in the present composition; c) the residual content of chloride salts in the oil is reduced. DETAILED DESCRIPTION Composition for dehydration and desalting of oil, including a surface-active demulsifier, liquid glass, a polyethylenepolyamine derivative and water, o and that, in order to increase the effectiveness of the composition, as a polyethylenepolyamine derivative, the composition contains polyethylenepolyamino-N-sulfopropionic acid of the formula C-CH2-CH2-KJ NH2 HOOCJ- where n 5-12, with the following ratio of components, weight. %: Surface-active demulsifier 0.03 -0.07 Liquid glass 0.008-0.128 Polyethylenepolyamino-Nsulfopropionic acid0.003-0.048 WaterOstal. Sources of information taken into account in the examination 1. State and prospects for the development of technology and technology for the collection, preparation of oil, gas and water in the industry, Moscow, VNIIOENG, 1975, p. 52, 65. 2. USSR author's certificate for application number 2547711/04, cl. C 10G 33/04, 1977 (prototype).