The method of producing salt water corrosion inhibitor

 

(57) Abstract:

The invention relates to methods for inhibitor salt corrosion. The proposed method lies in the interaction of chloroalkanes received by hydrochloridebuy fraction of higher fatty alcohols, Ethylenediamine in water when heated, and a hydrocarbon chain chloroalkanes contains 12 to 14 carbon atoms, and the process is conducted at a temperature of 150-160oAnd pressure 0,55-0,65 MPa. The amount of water is 5-15% by weight of the starting materials, preferably 10%. The resulting inhibitor has a high protective effect and bactericidal activity against corrosive sulfate-reducing bacteria. 1 C.p. f-crystals, 3 tables.

The invention relates to methods for inhibitor salt corrosion from chloroalkanes with alkyl radical C12-C14and Ethylenediamine.

A method of obtaining alkyl derivatives of diamines having the formula:

< / BR>
where R1, R2, R3, R4are the same or different alkyl radicals containing from 8 to 30 carbon atoms or at least one of them is a hydrogen atom, and p is 2 - 12 (U.S. Pat.The UK 2048861, opetator hydrogenation, for example, Nickel, and solvent, such as methanol, by heating under hydrogen pressure.

Also known is a method of obtaining N-alkylamidoamines reaction of ethylene diamine with an alkyl halide C3-C6when a molar ratio of (1 - 20) : 1 and a temperature of from -10 to 120oC in the presence of 0-50% water by weight of the original substances (Germany, application 2929841, publ.18.12.80). The resulting reaction mixture is neutralized inorganic alkaline agent. The aqueous layer was separated from the neutralized organic layer. The organic layer type hydrocarbon solvent and azeotropic distillation to remove water and Ethylenediamine. To allocate N-alkylamidoamines pure hydrocarbon is distilled off.

Obtained in this method, the products contain one alkyl radical with small (C3) or relatively small (C6) molecular weight, combined with a low molecular weight group of ethylene diamine. These products are corrosion inhibitors. In addition, in the method (the Federal Republic of Germany, application 2929841) used a large number of operations when selecting a product, which complicates the technology of its production and increases the cost of the product. The solvent makes the process more fire and vzryvoopasen mixture of aminopropanol, containing 1 to 6 amino groups, as a corrosion inhibitor (Patent RF 2074170, publ.27.02.97). A mixture of aminopropanol obtained by aminating the product of chlorination of liquid chloride liquid paraffins C10-C26with their boiling temperature 220-345oC carbamide deparaffinization. Amination of chlorinated paraffin wax spend Ethylenediamine, Triethylenetetramine and O-[N,N-bis-(2-amino-ethyl)-aminomethyl]-phenol in the wall under atmospheric pressure at a temperature of 120-160oC in the presence of a catalyst - copper filings with the subsequent processing of the reaction products in an aqueous solution of sodium hydroxide, separating the aqueous layer from the organic and Stripping of the organic layer from Ethylenediamine and traces of moisture.

However, the effectiveness of a mixture of aminopropanol as corrosion inhibitor obtained, as indicated in the patent of the Russian Federation 2074170 method is not high enough: the protective effect of the compositions at concentrations in inhibiting solution 250 mg/l for 6 hours 86,3-94,5%. In addition, this method is characterized by a large number of operations used to highlight key products.

Object of the present invention to provide a highly effective corrosion inhibitor.

The advantage of the proposed method is that as a result of heating at a temperature of 150-160oC chloroalkanes with alkyl radical C12-C14and Ethylenediamine is formed a mixture of alkyl substituted Ethylenediamine containing a large number (more than 90 wt.%) di-, tri - and tetraalkylammonium with a high molecular weight, having a good protective effect in corrosion of metallic materials.

The solubility of mixtures of high-molecular alkylamino in water and water in the mixture is practically zero, and the solubility of ethylene diamine and salts of Ethylenediamine in water is high, which significantly simplify the process at the stage of selection of the target product.

The invention is illustrated by the following examples.

Example 1-6.

In a metal reactor, the heated coolant, download chloralkali fraction C12quantities listed in table. 1. The contents of the reactor are heated at a temperature of 140-160oC for 13-15 hours. The reaction course is monitored by the amount of released hydrochloric salt of ethylene diamine (Seda), which octarepeat of 0.1 n alkali solution. Upon completion of the reaction the mixture is heated to ~80oC, poured into a separating volanco, in which are formed two layers: the upper organic layer containing the target product, unreacted chloralkali and impurities, and the lower layer of water containing the Ethylenediamine salt and Ethylenediamine. The bottom layer is separated and sent to the regeneration of Ethylenediamine from its salts by reaction with concentrated alkali solution.

The organic layer is poured from a separating funnel at a temperature above the 50oC and analysed. The chromatographic analysis is performed on the non-polar phase.

For rapid analysis of the finished product using the titration of a sample of 0.1 N. hydrochloric acid. The specific parameters of the process and its results are presented in table.1. The process is outside of the settings specified in the claims, reduces the yield of the target product.

The finished product is a pasta sicredi product composition, obtained under optimum conditions (op.4, PL. 1) and with the highest technical indicators, presented in table 2.

Anticorrosive action of a mixture of alkylamidoamines determined in the laboratory gravimetric method and the use of steel (steel grade 08 KP) plates 50 x 10 x 0.5 mm on the model of the water, imitating the produced water composition, g/l: Na+- 3,500; Ca2+- 0,056; Mg+2- 0,074; Cl-- 4,960; HCO3-- 1,461; CO32-- 0,024 and total mineralization of 10.1 g/l Concentration of product in inhibiting solution was and is 25.50 100 mg/l, the corrosion Rate of the control sample in eingeborenen model produced water for 6 hours was equal 0,972 g/m2including the results of the tests are presented in table 3.

Thus, the technical result of the invention is superior to the nearest equivalent to ten times (at a concentration equal to 25 mg/l proposed inhibitor, a protective effect is 93,5%, and a similar effect to 87.1% at a concentration of 250 mg/l).

In addition, it was found that the resulting mixture of alkyl substituted Ethylenediamine has bactericidal activity against corrosive SRB "ptx2">

High corrosion resistance and antibacterial activity of the product is recommended for use in oil production.

1. The method of producing salt water corrosion inhibitor interaction chloroalkanes with Ethylenediamine in aqueous medium at a temperature of 150 - 160oC, wherein the carbon chain of chloroalkanes contains 12 to 14 carbon atoms, and the process is conducted at a pressure 0,55 - 0,65 MPa.

2. The method according to p. 1, characterized in that the amount of water is 5 to 15% by weight of the original substances, preferably 10%.

 

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