RU1781286C - Method for dehydration and desalting of petroleum - Google Patents

Abstract

SUMMARY OF THE INVENTION: An oil is treated with a demulsifier containing hydroxyethylated alkyl phenol based on propylene trimers 0.08-0.09%, ethylene glycol 0.01-0.02% and water up to 100%. 7 tab.

Description

The invention relates to oil refining and can be used both in oilfield processing plants and in refineries in the process of deep dehydration and desalting of oil.

Known methods for dehydrating and desalting oil using nonionic surfactants such as disolvan 4411, separol WF-41, proxamine 385-506, reapon 4c as demulsifiers demulsifiers.

The closest analogue is the method of oil dehydration by treating it with a demulsifier composition, wt.%: Ethoxylated alkylphenol based on propylene trimers 60-65

Butanol30-35

Diammonium phosphate 0.07-0.1 Water Up to 100

The disadvantages of the known methods include the insufficiently high degree of dehydration and desalting of oil, the toxicity of demulsifying agents due to

they contain an average of 50% highly toxic methanol; the need to purchase imported demulsifiers for currency.

The purpose of the invention is to increase the degree of dehydration and desalination of oil. The goal is achieved in that as a demulsifier use the composition, wt.%:

Ethylated alkyl phenol based on propylene trimers 0.08-0.09 Ethylene glycol 01.01-0.02 Water Up to 100 Ethylated alkyl phenols based on propylene trimers according to TU 38-103625-87 is a technical mixture of polyglycol ether-monoalkyl phenols of the following composition:

. НСбН40 (С2Н40) „Н,

where R is a branched alkyl radical with

carbon number 9 (isononyl);

p is the number of moles of ethylene oxide equal to 10 or 12. accounted for by the hydroxyl group.

(L

WITH

Oxyethylated alkyl phenols based on propylene make-up artists comply with the standards specified in table. 1.

A comparative analysis with known technical solutions allows us to conclude that the claimed method differs from the known ones by the introduction in a certain amount of new, previously unused reagent for dehydration and desalting of oil.

Thus, the claimed solution meets the criteria of the invention of novelty.

Comparison of the claimed method with the known technical solutions in the art did not allow them to identify features that match the features of the claimed method, which allows us to conclude that the criterion meets significant differences.

Experimental confirmation of the claimed decision was carried out by comparing the results of the prototype and the claimed decision

Examples. The effectiveness of the inventive composition is tested on oil from the Karazhanba field with a water content of 38% containing 2573 mg / l of chloride salts, and oil from the Teren-Uzyuk field with a water content of 25% containing 2704 ml / l of chloride salts.

Dehydration and desalination are subjected to 200 g of the corresponding oil, heated to a predetermined temperature of heat treatment of oil 60 ° C

In the case of the prototype, a demulsifier of the composition, wt.%, Is introduced into the heated emulsion with stirring:

Hydroxyethylated al- with kilphenol based on propylene trimers (A) 60-65

Butanol (B) 30-35

Diammoyiophosphate (D) 0.07-0.1

Water (B) Up to 100

In the case of the claimed method, compositions with different content of components — ethoxylated alkyl phenol based on trimers of propylene, ethylene glycol and water — are tested for demulsifying ability. In addition, for comparison, control tests were carried out to demulsify the oil directly with either only hydroxyethylated alkylene phenol based on propylene trimers or ethylene glycol.

The amount of nonionic surfactant in the case of the prototype is taken at the rate of 60 g per 1 ton of oil. To allow comparison of the results in the case of the claimed method and

in control experiments, the amount of reagent (a mixture of hydroxyethylated alkyl phenol based on trimers of propylene and ethylene glycol or each of these substances separately) is taken in all experiments as 60 g of reagent per 1 tonne of nefgi.

The amount of separated water is measured every 30, 60.90 and 120 minutes. The residual water content of oil is determined

according to GOST 2477-65. The content of chloride salts after settling for 2 hours is determined according to GOST 21534-76.

The data obtained on the oil of the Karazhanbass field are given in table.

2-4, The data obtained at the Terend Uzuk field nefgi are shown in Table 2. 5-7.

From the data given in table. 2- it follows that the effectiveness of dehydration

and desalting during the processing of oil by the prototype is superior to the efficiency of dehydration and desalting of oil directly only or with ethoxylated alkyl phenol based on trimers

propylene, or ethylene glycol. However, at certain ratios, the efficiency of dehydration and desalting of oil with a mixture of ethoxylated alkyl phenol based on propylene trimers

ethylene glycol changes in the direction of increasing the dehydrating and desalting effect (increasing the degree of dehydration and desalting), exceeding the known ones. Moreover, the greatest degree of dehydration and desalination is achieved by treating the oil with a composition. wt.%:

Oxmethylated alkyl phenol based on propylene trimers (A) 0.08-0.09 Ethylene glycol (E) 0.01-0.02

Water (B) Up to 100

The best dehydrating and desalting activity of the proposed structure for

Compared with the known, the synergistic effect of the action of ethoxylated alkyl phenol based on trimers

propylene, ethylene glycol and water, taken x

the indicated ratios x.

Claims (1)

The proposed method of dehydration and desalting of oil can be used at present in oil preparation processes at oil fields and oil refineries without changing existing schemes and equipment. SUMMARY OF THE INVENTION A method for dehydrating and desalting oil by treating it with a demulsifier containing hydroxyethylated zlkylphenol based on propylene trimers. alcohol and water, characterized in that, in order to increase the degree of dehydration and desalting, use a demulsifier containing ethylene glycol as alcohol, in the following ratio of components in the demulsifier, wt.%: Hydroxyethylated alkylphenol based on propylene trimers 0.08-0.09 Ethylene Glycol 0.01-0.02 Water. Up to 100. Index Transparent, oil nista colorless to light yellow 83 7 ± 1 75 ± 3 0.5 99 Table 1 Analysis method According to paragraph 5.2 of TU 38-103625-87 According to paragraph 5.4 of TU 38-103625-87 According to GOST 225675-77 According to clause 5.5 TU 38-103625-87 GOST 14870-77 Sec. 2 According to paragraph 5.7 of TU 38-103625-87 table 2 Table 3 Table 4 Table 5 Table 6 Table 7