ANALYSIS OF THE ANTI FOAMING SOLUTION TSU, OBTAINED ON THE BASIS OF LOCAL ANTIFOAMING RAW MATERIALS ARISING FROM GAS CLEANING

ABSTRACT

In this article, the synthetic analysis of defoamer solution for foaming processes in amine purification of gases from raw hexane (dried up to 60-160℃) of  heavy  hexane, which comes out as a residue from the polypropylene production plant at the "Gas-chemical complex" given.

АННОТАЦИЯ

В данной статье приведен синтетический анализ раствора пеногасителя при вспенивании во время аминной очистки газов от сырого гексана (высушенного до 60-160℃) и тяжелого гексана, который выходит в виде осадка из установки по производству полипропилена на "Газохимическом комплексе".

Keywords: hexane, waste, raw material, residue, gas IR-spectroscopy, amine solution, foaming, absorber, surfactants, hydrogen peroxide, boric acid, hexane waste, device, absorption, methyldiethanolamine.

Ключевые слова: гексан, отходы, сырье, осадок, газовая ИК-спектроскопия, раствор амина, вспенивание, абсорбент, поверхностно-активные вещества, перекись водорода, борная кислота, отходы гексана, устройство, абсорбция, метилдиэтаноламин.

Introduction

At a time when the demand for fuel in the national economy network is increasing in Uzbekistan, the residues coming out of the existing ‘Gas-chemical complexes and oil and gas processing plants’ in Uzbekistan are thoroughly processed based on modern technologies and are of high economic efficiency international standards. Currently, one of the important problems in the oil and gas industry is to prevent the formation of residues, as well as to study their composition [1-4]. Hexane is used as a suspension in the main polypropylene production plant in ‘Gas-chemical complexes.’ Most of the hexane removed from the process is repurified and the remaining heavy hexane and polymer residues are removed from the process. Today, the formation of heavy hexane from the main polypropylene workshop of the enterprise and its prevention is an urgent problem [5].

Materials and methods

Hexane waste from ‘Gas-chemical complexes,’ methods of physics-chemical analysis, methods of analysis of products according to state (SST) and world (ASTM) standards were used as the object of research. Research work SST 2177-99 (ISO 3405-88) ARN-LAB-1 laboratory device is presented in Figure 1.

Figure 1. ARN-LAB-1 laboratory equipment for oil production fractions:
1 - flask; 2 - coolant pipeline; 3 - thermometer; 4 - water cooler; 5 - product collector; 6 - heater; 7 – tripod

One of the modern research methods, the IK-spectroscopy method presented in Figures 2, 3, was used for the development of methods for the separate extraction of structural components of the samples in which the heavy hexane residue was heated to 60 ^oC -160 ^oC in this device [6-9].

Deformation of the -CH group when analyzing the infrared spectra of hexane and its oxidation products with H₂O₂ and H₃BO₃: Alkanes show deformation vibrations of -CH below the 3000 cm^-1 area. In this case, again, scissor vibrations at 1465 cm^-1, methyl groups exhibit absorption at 1375 cm^-1 due to vibro-symmetric scissor vibration, and the latter at 1450 cm^-1 due to asymmetric scissor vibration [10].

Figure 2: IK spectrum of hexane

When oxidized with oxidizing agents, the following characteristic lines appeared. This means that hexane-hexene has been oxidized and characteristic absorptions of 3240.41 cm^-1 characteristic for –OH groups have been formed.

Figure 3: IK-spectrum of the oxidation product of oxidized hexane-hexane

A 500 ml three-necked flask was placed on a magnetic stirrer and secured to a tripod. 10 ml of 60% hydrogen peroxide (H₂O₂) and 10 ml of boric acid (H₃BO₃) were mixed in the flask. Then 11 ml of the solution of hexane waste, that is, the temperature of which was driven from 60℃ to 170℃, was added to the mixture. A thermometer was attached to the flask to detection of the temperature. During synthesis, the temperature was 95℃and the time duration was 120 minutes.

It was determined by modern testing methods that higher alcohols were formed under the influence of a weak oxidizing agent during the synthesis process. Higher alcohols are compounds with a higher viscosity than lower alcohols due to intermolecular hydrogen bonding, and their non-volatile density is greater than one. The refractive index, density, and viscosity of the synthesis product were studied during the change reaction. The synthesized solution was called TSU.

Figure 4. Laboratory device for synthesis of anti-foaming solution TSU

Antifoaming chemical solutions are used to reduce and prevent foaming in industrial technology. There are many types of antifoam agents with different properties and defoaming effectiveness.

Physical methods of influencing foaming include thermal effects (heating, freezing, live steam treatment), electric current, acoustic waves (mainly ultrasound), vibration and high capillary pressure formation in the foam to do etc.

The formula for determining the height of foaming:

H=H₂-H₁

Here H₂ is the height of foam liquid mm; H1 - the height of the liquid above the filter mm.

Table 1.

Standards of foaming of amine solutions in the absorber device

Tests were carried out with the synthesized TSU defoamer solution and different concentrations of methyl diethanolamine. In the test work, a measuring cylinder, air instead of natural gas, TSU solution, a stopwatch and a compressor were used.

In the research work, the life period of the foam, its height, and the concentration of the solution were considered the main indicators.

In the test work, 400 ml of MDEA(REG) was placed in a 500 ml cylindrical flask and mixed with 0.4 ml of TSU solution. Then the compressor is started, controlling the pressure, temperature and duration of time. Then the height of the foam was 6 mm. The fading period of the foam lasted 19 seconds.

Figure 5. Laboratory device for testing TSU solution with amine solution

The obtained results revealed that the TSU solution corresponds to all performance standards of foaming according to the requirements of SST given in Table 1. Figure 3 shows the dependence of TSU concentration on foaming height.

Figure 6. Graph of dependence of TSU concentration on foaming height

It can be seen in the picture that the foaming height was 6 mm when the concentration of TSU solution was 10 mg/l. This means that the MDEA solution has a low foaming capacity according to foaming process indicators and indicates that TSU is not prone to foaming.

In addition, the presence of contaminants in the water pumped into the system can cause blockages in the system and many problems in operation.

If steam condensate without heat-resistant salts is used in the process, foaming, corrosion, clogging of evaporator pipes, clogging of pumps, formation of a layer of heat-resistant salts, subsequent reduction of heat exchange efficiency in the evaporator, and overall reduction in amine It is necessary to avoid problems such as a decrease in conductivity.

Conclusion

In this summary, a new type of defoamer TSU  solution was synthesized at a temperature of 95 ⁰C and a time duration of 120 minutes during the synthesis process with the addition of hexane waste from "Gas-chemical complexes" and hydrogen peroxide and boric acid, and the synthesis experimental works and IR-spectroscopy of the prepared solution were carried out. When analyzing the infrared spectra of hexane and its oxidation products with H₂O₂ and H₃BO₃, deformation of the -CH group: Alkanes showed deformation vibrations of -CH below the 3000 cm^-1 area. It also showed absorptions at 1465 cm^-1, methyl groups at 1375 cm^-1 due to vibro-symmetric scissor vibration, and the latter at 1450 cm^-1 due to asymmetric scissor vibration. According to the experimental results, when adding 0.1% of the new type TSU defoaming solution, the defoaming time was 4 seconds and did not affect its concentration in the solution and its environment. This proved that it met all the requirements of SST.

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