Composition for inhibition of asphalt-resin-paraffin precipitations

FIELD: oil industry.

SUBSTANCE: composition for prevention of asphalt-resin-paraffin precipitations on basis of liquid pyrolysis products, used in amount of 0.03-0.05 of oil mass, has following composition, %: dark oil polymer resin, received by oxidizing polymerization of heavy pyrolysis resin during blowing of air with flow 17-23 hour-1, temperature 145-155°C in presence of cobalt salts during 2-2.5 hours, 30-35, alkylaromatic hydrocarbons 65-70.

EFFECT: higher efficiency.

3 ex, 3 tbl

 

The invention is intended to prevent the formation of asphalt, resin and paraffin deposits in oil and can be used in oil and other industries associated with the production, transport and storage of oil.

At the present time to prevent the deposition of paraffin used a wide range of complex substances and compositions.

The known method which consists in introducing into the condensate residue of vacuum distillation of tar in an amount of 0.01 to 1.00 wt.%. As a positive point, it is noted that due to the good solubility of tar in the gas condensate and oil products at 15-25°it can be entered directly in the commodity flow without prior dissolution [A.S. No. 1364699, CL E 21 In 37/06, 1988].

The disadvantages of the method are the low efficiency of inhibition and technical complexity with the introduction of inhibiting the object of tar due to its high melting temperature.

One of the means to prevent deposition of paraffin is the composition of the tar, aromatic solvent nefras and VAT residue production of herbicide lenacil technical stage regeneration butanol, in the following ratio, wt.% [RF patent 2057778]:

- tar (15-30)

aromatic solvent nefras (40-70)

- to Bowie residues from the production of herbicide lenacil (15-30).

The disadvantage is the high concentration of the introduced additives from 0.2 to 0.6%.

The closest in technical essence is the use of a composition obtained from wastes of petrochemical industry. In the composition as a main component is used, the fraction of 130-220°formed in the form of distillate in obtaining petroleum resins by the method of thermopolymerization liquid pyrolysis products. As an additive in various embodiments, use or VAT residue of the distillation of liquid products of pyrolysis from the initial boiling point above 220°With or oxidized bitumen, or used motor oil [RF Patent 2092677]. The degree of inhibition of this composition is from 7 to 38%.

The present invention is improving the efficiency of preventing the formation of deposits during production, transport and storage of oil with simultaneous expansion of the resource base and range of inhibitors on the basis of wastes and by-products processing of various hydrocarbons.

The technical result is achieved in that the composition is a 30-35%solution of dark petroleum resin (TNPS) alkylaromatic hydrocarbons and is used in a quantity of 0.03 to 0.05% by inhibiting oil.

Dark petroleum resin (TNPS) are obtained by oxidative polymerization of heavy pyrolysis the resin (SCC), which is carried out using oxygen with a flow rate of 17-23 h-1at a temperature of 145 -155°in the presence of salts of metals of the iron subgroup, in particular resinate cobalt (0,05%), for 2 hours. Received petroleum resin have the following characteristics:

- appearance - solid dark brown or black amorphous substance;

- softening temperature - 64-65°C;

- iodine value - 48-52 g I2/100 g;

- solubility in toluene - full;

- elemental composition,%: (85,98), N (9,03), S (0,012), (0,61).

As the aromatic hydrocarbons can be used toluene, xylene and solvent.

This technical result is achieved by introducing into the oil depressant, representing 30-35%solution of TNPS in aromatic hydrocarbons and used in a quantity of 0.03 to 0.05% by inhibiting oil.

Quantitative assessment of sediment formation processes conducted at the facility, developed on the basis of a known method of "cold core", under the following test conditions: temperature of sample oil - 30°C, the temperature of a metal rod - 12°and the duration of a single experience - 60 minutes. Inhibitory ability of additives to prevent the formation of oil sludge on "cold core" was calculated by the formula:

where Sandthe degree of inhibition, %;

W0output sediment source of oil, g;

W1output sludge oil with additive, was

Example 1. On oil Archa deposits investigated the inhibiting properties of the additive (30 wt.%) on the basis of TNPS obtained in the presence of salts of cobalt and toluene (70 wt%).

The use of inhibitory additives based TNPS for oil Archa field prevents the formation of sludge at 66-68% in the concentration in the oil 0,03-0,05% (table 1).



Table 1
Inhibiting ability of the additive to the oil Archa field.
The concentration of the additives in the oil, %The amount of paraffin oil, g/100 g oilThe inhibiting ability, %
0,004,51 
0,031,5266,26
0,051,4168,76

Example 2. On oil Urmanskoye deposits investigated the inhibiting properties of the additive (35%) on the basis of TNPS obtained in the presence of cobalt salts and mixtures of isomers of xylene (65%).

The use of inhibitory additives based TNPS for oil Urmanskoye field prevents the process image is of the sediment at 62-67% in the concentration in the oil 0,03-0,05% (table 2).

Table 2
Inhibiting ability of the additive to the oil Urmanskoye field.
The concentration of the additives in the oil, %The amount of paraffin oil, g/100 g oilThe inhibiting ability, %
0,001,91 
0,030,7262,51
0,050,6267,41

Example 3. On oil South Taganskogo deposits investigated the inhibiting properties of the additive (31%) on the basis of TNPS obtained in the presence of cobalt salts and solvent (69%).

The use of inhibitory additives based TNPS for oil Urmanskoye field prevents the formation of sludge at 67-70% in the concentration in the oil 0,03-0,05% (table 3).



Table 3
Inhibiting ability of the additive to the oil of the South Taganskogo field.
The concentration of the additives in the oil, %The amount of paraffin oil, g/100 g oilThe inhibiting ability, %
0,005,91 
0,031,72 70,89
0,051,9567,0

Thus, the proposed additive is effective to prevent asphalt, resin and paraffin deposits in oil and can be used in oil and other industries associated with the production, transport and storage of oil. The availability and low cost source of liquid pyrolysis products, simplicity and safety of use of the polymerization initiators (air and salts of metals of variable valence), a wide range of individual aromatic hydrocarbons and their technical mixtures, as well as their full interoperability and compatibility with oils determine the availability and cheapness of the proposed inhibitory composition.

Composition for prevention of oil deposits on the basis of liquid pyrolysis products, characterized in that the composition is used in a quantity of 0.03 to 0.05% by weight of oil, has the following composition, %:

Dark petroleum resin,

obtained by oxidative polymerization

heavy pyrolysis resin by blowing

air flow 17-23 h-1temperature

145-155°in the presence of cobalt salts within

2-2,5 h 30 - 35

Alkylaromatic hydrocarbons 65 - 70



 

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3 ex, 4 tbl

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