SU1723099A1 - Method of oil dehydration - Google Patents

Abstract

The invention relates to refining, in particular to the dehydration of oil. The purpose of the invention is to increase the degree of dehydration of the latter. To do this, the oil is treated with a demulsifier containing wt.%: Ethoxylated alkylphenol (based on the reaction products of propylene trimers with 10-12 mol of ethylene oxide per one hydroxyl group) 60-65; butanol 30 - 35; diammonium phosphate 0.07 - 0.1; water to 100. In this case, the content of water and chloride salts in the oil is reduced by 3 times (the residual amount of water is 0.2% and salts 70-80 mg / l), 2 tab.

Description

The invention relates to the preparation of oil and can be used in the preparation of oil in the fields and oil processing plants.

Methods are known for the dehydration of oil using a deemulgator reagent for non-ionic surfactants, such as disolvan 4411, 4490, X-2647 demulsifier, proxamine 385, proxanol 186, proxenamine HP-71, proxamin amin HP-76, diproxamin 157- 65m, SNPH-41, reap.

Methods of oil dehydration are also known with the use of separol WF-41 as a demulsifier.

However, the known methods are characterized by an insufficiently high degree of oil dehydration, as well as the high cost and toxicity of de-emulsifier reagents.

Closest to the present invention is a method of dehydrating oil by treating it with a demulsifying agent - hydroxyethyl alkylphenol.

The disadvantage of this method is the low degree of oil dehydration.

The purpose of the invention is to increase the degree of oil dehydration.

The goal is achieved by the fact that according to the method, the dehydration of oil is carried out by treating it with a demulsifier containing 60 to 65% by weight of oxyethylated alkylphenol based on propylene trimers containing 10-12 mol of ethylene oxide per hydroxyl group; 30 - 35

VI

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oh oh

wt.% butanol, 0.07 - 0.1 wt.% diammonium phosphate and water (up to 100 wt.%).

The ethoxylated alkylphenols based on propylene make-ups according to TU 38.103625-87 are a technical mixture of polyglycol ethers of monoalkylphenols of the following composition: RC6H40 (C2H20) n H,

where R is a branched alkyl radical with the number of carbon atoms 9 (isononyl);

n is the number of moles of ethylene oxide equal to 10 or 12 per hydroxyl group.

Oxyethylated alkylphenols based on propylene trimers comply with the standards listed in Table. one.

Example. 200. ml of Teren-Uzyuk field oil with a water content of 25 wt.% Heated to oil treatment temperature (50 ° C) is subjected to dehydration.

In a series of comparative experiments (12) and (13), either separol WF- 41, or ethoxylated alkylphenol based on propylene trimers, or ethoxylated n-secondary nonylphenol are introduced into the heated emulsion with stirring

C9H19C6H4 (C2H40) 32H.

In a series of experiments according to the invention (experiments 1–5, 7, and 8), compounds containing the following components are tested for demulsifying ability: ethoxylated alkylphenol based on propylene trimers with 10–12 mol of ethylene oxide on the hydroxyl group AF and water, different ratios.

The amount of separated water is measured every 30, 60, 120 minutes. The content of the remaining water in the oil is determined according to GOST 2477-65.

The effectiveness of the reagent is evaluated according to the degree of oil dehydration and technological properties (in the viscosity-temperature) according to GOST 9965-76.

The results of the dehydration of oil in the presence of known reagents and a demulsifier according to the proposed method, as well as the formulation of the demulsifiers according to the proposed method are given in table. 2

From the data given in table. 2, it is believed that the highest degree of dehydration is achieved when treating oil with a composition containing the components in the following ratio, wt%:

Ethoxylated

alkylphenol based

propylene trimers AF 60-65

Butanol30 - 35

Diammonium Phosphate (DAP) 0.07-0.1 Water Else

An increase in the content of AF in the demulsifier over 65% leads to an increase in viscosity, which impairs the technological properties of the reagent. A decrease in the content of AF less than 60% impairs the demulsifying activity of the reagent.

The optimum DAP content in the mixture is 0.07-0.1%. Increasing and lowering the content of DAP in the mixture does not significantly affect the dewatering process and the quality of the oil.

With a decrease in the content of butanol in the composition of the demulsifier less than 30% (test 6), the technological properties of the reagent deteriorate (the viscosity increases).

From the data table. 2, it can be seen that along with the decrease in water, the content of chloride salts in oil decreases by a factor of 3.

Industrial testing of the proposed method for the dehydration of oil from the Tereny-Uzyuk field of oil and gas production department Kulsaryneft PO Tengizneftegaz using the demulsifier according to the invention has been carried out. 8 wt.% Water. When dehydrating the same oil imported (made in Germany) by the demulsifier, separol WF-41 at the same reagent consumption in oil remains 1.2-2.4 mas,% of water.

The proposed method of oil dehydration can be used at present in oil preparation processes at oil producing enterprises without altering the existing technological schemes and equipment.

Claims (1)

Claims An oil dehydration method by treating it with an oxyethylated alkylphenol based demulsifier, characterized in that, in order to increase the degree of dehydration, an emulsifying agent containing alkylphenol based on propylene trimers ethoxylated with 10 to 12 moles of ethylene oxide per hydroxyl group is used. and additionally containing butanol, diammonium phosphate and water in the following ratio of components in the demulsifier, wt.%: Polyoxyethylene alkylphenol, described above 60-65 Butanol 30-35 Diammonium phosphate 0.07-0.1 WaterUnder 100 Table 1 Indicator Appearance at 25 C The cloud point of an aqueous solution with a mass concentration of 10 g / dm3, ° C. The reaction medium (pH) of an aqueous solution with a mass concentration of 10 g / dm3 Hydroxyl number, mg KOH / g Mass fraction of water,% Mass fraction of active ingredient, Norm Analysis method According to paragraph 5.2, TU 38.103625-87 Pop 5.4, TU 38.103625-87 Not below 83 According to GOST 225675-77 Pop 5.5, TU 38.103625-87 GOST 14870-77, sect. 2 TU 38.103625-87 table 2