RU2564329C1 - Composition for preventing inorganic deposits - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition contains the following components, in wt %: oxyethylidenediphosphonic acid - 5.0-25.0, 2-phosphonobutane-1,2,4-tricarboxylic acid- 5.0-25.0, monoethanolamine or mixture of monoethanolamine and ammonium hydroxide - 5.0-20.0, methyl alcohol - 10-45, low-boiling hydrocarbon fraction from production of polycarbonates - mixture of lower alcohols - 20.0-45.0, water - the balance.

EFFECT: composition is effective for inhibiting complex composition scales and is corrosion-protective.

1 tbl, 21 ex

Description

The invention relates to compositions for preventing inorganic deposits and can be used in the oil and heat industry to prevent scaling in water systems.

A known composition for preventing inorganic deposits, including hydroxyethylidene diphosphonic acid, alkanolamine, ethylene glycol and water (RF patent No. 2122981, MKI C02F 5/14, 1998). This composition prevents carbonate deposits. The disadvantage of this composition is the high corrosion rate with respect to the metal of oilfield equipment (0.471 g / m ² h at 20 ° C).

A known composition for preventing inorganic deposits, including a phosphonic component, a water-soluble polymer, an amine component, a corrosion inhibitor, a hydroxyl-containing compound and water (RF patent No. 2447197, IPC C23F 11/10, C09K 8/54, 2012). The known composition prevents the precipitation of calcium salts and is not intended to inhibit a wide range of inorganic deposits, including barium salts, strontium.

Closest to the proposed composition is a composition for preventing inorganic deposits, including hydroxyethylidene diphosphonic acid, monoethanolamine or a mixture of monoethanolamine with ammonium hydroxide, methyl alcohol and water (RF patent No. 2417955, MKI, C02F 5/14, 2011). This composition has a low corrosion rate, but does not have a sufficient degree of corrosion protection.

The objective of the present invention is to provide an effective composition to prevent a wide range of inorganic deposits with protective anticorrosive action.

The problem is solved in such a way that the composition for preventing inorganic deposits, including hydroxyethylidene diphosphonic acid, monoethanolamine or a mixture of monoethanolamine and ammonium hydroxide, methyl alcohol and water, additionally contains 2-phosphonobutane-1,2,4-tricarboxylic acid and a hydrocarbon fraction of low-boiling polycarbonate production a mixture of lower alcohols, in the following ratio of components, in wt.%:

Hydroxyethylidene diphosphonic acid 5.0-25.0 2-phosphonobutane - 1,2,4-tricarboxylic acid 5.0-25.0 Monoethanolamine or mixture monoethanolamine and ammonium hydroxide 5.0-20.0 Methyl alcohol 10-45 Low-boiling hydrocarbon fraction

polycarbonates (UVPC) -

mixture of lower alcohols 20.0-45.0 Water rest

To prepare the proposed composition using the following chemical products:

Oxyethylidene diphosphonic acid (OEDP) is a well-known product manufactured in accordance with TU 2439-350-05763458-2003

Monoethanolamine (IEA) according to TU 2423-159-00203335-2004

Ammonium hydroxide according to GOST 24147-80

Methyl alcohol (MS) according to GOST 2222-95

2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) product manufactured by Shandong Taihe Water Treatment CO, LTD

The low-boiling hydrocarbon fraction of the production of polycarbonates (UVNpc) is a mixture of lower alcohols, produced according to the technical requirements of 07/12/2010 according to the technical passport of OJSC Kazanorgsintez.

The composition is obtained by mixing the starting components at a certain ratio within the claimed limits. We give examples of specific performance.

Example No. 1 (prototype)

Example No. 2 (proposed)

To 5.0 g of HEDP, 25.0 g of PBTC, 20 g of monoethanolamine, 18 g of methanol, 20.0 g of UVPC, 12.0 g of water are added. The mixture is stirred until a homogeneous product.

Examples No. 3-21 are performed analogously to example No. 2, changing the quantitative ratio of the components.

The composition of the samples are shown in table 1.

The resulting compositions are homogeneous liquids with a pour point of from minus 50 to minus 60 ° C, a density of from 0.800 to 1.200 g / cm ³ , which have a high inhibitory effect against inorganic salts of complex composition, including calcium carbonates and sulfates, barium sulfates and strontium, and protective inhibitory effect against corrosion.

The effectiveness of the composition for the prevention of inorganic deposits is confirmed by laboratory tests, when dosing samples in the declared ranges of the content of the components of the proposed composition (table 1) in mineralized water (total mineralization 57.36 g / dm ³ ) at a concentration of each composition from 30 to 100 mg / dm ³ . The effectiveness of the inhibition of scaling is determined by the method of residual concentration of precipitating cations.

Tests for evaluating the protective effect of the composition against corrosion are carried out by the gravimetric method at a temperature of 20 ° C on samples made of carbon steel st. 3. The degree of corrosion protection (Z),%, is calculated by the formula: Z = [(Vo-Vx) / Vo] × 100,

where Vo is the corrosion rate of the metal in the aquatic environment in the absence of the claimed composition, mm / year;

Vx is the rate of metal corrosion in an aqueous medium in the presence of the claimed composition, mm / year.

Data on the test results are shown in table 1.

The proposed composition for inhibiting scaling, due to the claimed ratio of the components, provides a protective anti-corrosion effect while maintaining high efficiency inhibition of scaling.

From table 1 it follows that the proposed composition is more effective compared to the prototype in terms of the effectiveness of inhibition of scaling of complex composition and the degree of protection against corrosion.

Claims (1)

Composition for preventing inorganic deposits containing hydroxyethylidene diphosphonic acid, monoethanolamine or a mixture of monoethanolamine and ammonium hydroxide, methyl alcohol and water, characterized in that it additionally contains 2-phosphonobutane-1,2,4-tricarboxylic acid and a hydrocarbon fraction of low-boiling polycarbonate production - mixture lower alcohols, in the following ratio of components, wt.%:
hydroxyethylidene diphosphonic acid 5.0-25.0 2-phosphonobutane-1,2,4-tricarboxylic acid 5.0-25.0 monoethanolamine or mixture monoethanolamine and ammonium hydroxide 5.0-20.0 methyl alcohol 10-45 low-boiling hydrocarbon fraction polycarbonates - a mixture of lower alcohols 20.0-45.0 water rest.