SU1081166A1 - Process for preparing inhibitor of salt deposition - Google Patents

Abstract

A METHOD FOR OBTAINING A SALT INHIBITOR by phosphorylating a mixture of triethanolamine and a hydroxyl-containing compound with phosphorus pentoxide with heating, characterized in that, in order to simplify the process and increase the effectiveness of the inhibitor, glycerol is used as a hydroheyl-containing compound and is carried out with a 70–80 setting that is in excess of 70–80. , glycerol and phosphorus pentoxide

Description

About a The invention relates to methods for producing a phosphorus-containing scale inhibitor and can be used to prevent the deposition of inorganic salts in oilfield equipment and other equipment that use highly saline water. A known method for producing a phosphorus-containing scale inhibitor by phosphorylation of a polyoxyethylene glycerol derivative by polyphosphoric acid or phosphorus pentoxide at 50-175 ° C, followed by neutralization of the mixture obtained by scooping 1. However, the resulting inhibitor does not have a sufficiently high efficiency. There is also known a method for producing a phosphorus-containing scale inhibitor by phosphorylation of hydroxyethyl amines, for example ethylenediamine, triethanolamine, polyphosphoric acid or phosphorus pentoxide 2 and 3. However, in the course of the reaction, the viscosity of the reaction mixture greatly increases and it is necessary to raise the process temperature to 200 ° C. The closest to the invention to the technical essence and the achieved result is a method of obtaining a scale inhibitor by phosphorylation with phosphorus pentoxide of a mixture of triethanolamine and ethoxylated higher alcohol or phenol at 130-140 ° C, followed by neutralization of the obtained product 4. The disadvantages of the known method include the process at high temperature, which leads to partial decomposition of the target product and reduce its effectiveness as a scale inhibitor. The aim of the invention is to simplify the process and increase the effectiveness of a scale inhibitor. This goal is achieved by the method of producing a salt inhibitor inhibitor, which consists in the fact that a mixture of triethanolamine and glycerol is subjected to phosphorylation of phosphorus pentaculo at 70-80 ° C with a molar ratio of triethanolamine, g of pyrene and phosphorus pentoxide (3.0-3 , 3): 2.0 2.31: 11.0-1.2). The use of glycerin allows c. increase the viscosity of the reaction mixture during phosphorylation, since the glycerol itself and the glycerolphosphoric acid formed during the reaction have a low melting point, and therefore it is possible to reduce the temperature of the process to 70-80 ° C. Excess triethanolamine (TEA) during phosphorylation does not require a neutralization step and the product is directly used after dilution with water. To compare the effectiveness of the proposed scale inhibitor with the known last, phosphorylation of a mixture of triethanolamine and primary fatty alcohols ethoxylated with 7 moles of ethylene oxide fraction (DT-7 synthanol with phosphorus pentoxide) (Example 1). Example 1. A mixture of 44.7 g (0.3 M) triethanolamine and 8.8.3 g (0.2 M / DT-7 syntanol with a hydroxyl number of 127 add 14.2 g (0.1 K) P2O5 with vigorous stirring. Stir for 1 hour at 130-140 ° C, cool to 147.2 g iodine is added at room temperature. The resulting aqueous solution is tested as e) a scale inhibitor. Example 2. To a mixture of 44.7 g (0.3 K) of triethanolamine and 18.4 g (0.2 M) of glycerol, 14.2 g (0.1 M | PrO) are added with vigorous stirring. 1 h at 70 ° C, cooled to room temperature, and 67.3 g of water is added, a clear solution is obtained with a pH of 8, which is directly tested as a scale inhibitor Example 3. To a mixture of 49.2 g (0.33 M) triethanolamine and 21.2 g (0.23 M) glycerol with vigorous stirring, 17.0 g (0.12Mi P20) are added. Stir for 1 h at 80 ° C, cool to room temperature, add 87.4 g of water. A clear solution with a pH of 8 is obtained, which is used as a scale inhibitor. According to the conventional method b, the inhibiting properties of the proposed scale inhibitor, industrial inhibitor (HEDP) and a known inhibitor with similar composition (example II with respect to calcium sulfate and calcium carbonate (inhibitor concentration 10 mg / l, temperature 75 ° C) are determined. The results are shown in the table.

6

ora

20

90

one

140

2

145

3

52

60 110

58.9 86.4 230 88.9 247

Note of Te As shown in the data table, the proposed inhibitor of salinity; in efficiency, the promoted inhibitor of HEDP, as well as the known inhibitor of salt deposition t, is the most similar in composition.

The method of obtaining the inhibitor is simple and does not require complicated instrumentation. The available compounds, triethanolamine, glycerin, and phosphorus pentoxide, are used for the synthesis of the inhibitor, and the process is carried out at a relatively low temperature (70-80 ° C). induction period of crystallization, min. protective effect,%.

Claims (1)

METHOD FOR PRODUCING A SALTON INHIBITOR by phosphorylation of a mixture of triethanolamine and a hydroxyl-containing compound with phosphorus pentoxide when heated, characterized in that, in order to simplify the process and increase the effectiveness of the inhibitor, glycegrin is used as the hydroxy-containing compound and the process is carried out at a temperature of 70-80 ° C in molar glycerol and phosphorus pentoxide (3.0-3.3): (2.0-2.3): (1.0-1.2). o □ o