STUDY OF BY-PRODUCTS COMPOSITION AND SYNTHESIS OF CARBON ACIDS

ABSTRACT

During the pyrolysis process of hydrocarbons, along with the primary products (ethylene, propylene, butene-1, hydrogen), secondary products such as pyrolysis distillate, pyrolysis oil, and tar-based products are also formed. Polynuclear aromatic hydrocarbons undergo polycondensation with carbonic acid formalin, resulting in weak cationites and polynuclear polymethylene aromatic carbonic acid. These products have been analyzed using IR spectroscopy, TGA, and DTA methods to compare their composition. Hydrocarbons were separated through fractionation and subsequently used as raw materials in further processes.

АННОТАЦИЯ

В процессе пиролиза углеводородов, наряду с основными продуктами (этилен, пропилен, бутен-1, водород), образуются также вторичные продукты, такие как пиролизный дистиллят, пиролизное масло и смолоподобные продукты. Полиядерные ароматические углеводороды подвергаются поликонденсации с формалином угольной кислоты, в результате чего получаются слабые катиониты и полиядерные полиметиленароматические угольные кислоты. Эти продукты были проанализированы с использованием методов ИК-спектроскопии, ТГА и ДТА для сравнения их состава. Углеводороды были разделены путем фракционирования и использованы в качестве сырья для дальнейших процессов.

Keywords: tar product, pyrolysis distillate, 1-methylanthracene, 2-methylanthracene, 9-methylanthracene, polycondensation

Ключевые слова: продукт смолы, дистиллят пиролиза, 1-метилантрацен, 2-метилантрацен, 9-метилантрацен, поликонденсация.

Introduction: Polymethylene aromatic carboxylic acid was synthesized on the basis of polynuclear arenes obtained from tar-product composition. During pyrolysis of hydrocarbons, in addition to the main product (ethylene, propylene, butene-1, hydrogen), secondary products (pyrolysis distillate, pyrolysis oil and tar product) are formed [1]. The secondary products formed during the pyrolysis process, in turn, are processed to obtain important raw materials used in various industries. Reagents used in the chemical industry, oil and gas processing enterprises, energy, pharmaceutical, construction, agriculture and other industries are produced from materials obtained from secondary products [2,3] .

Materials and methods: The joint venture of Uz-Kor Gas Chemical Limited Liability Company, one of the giant industrial enterprises of our republic, is based on natural gas processing. Together with the main product, more than 102,000 tons of pyrolysis distillate, 8,000 tons of pyrolysis oil and 10,000 tons of "tar products" are produced in the complex. Because these secondary products have not been processed, environmental problems have been caused by the "tar-product" processing, naphthalene aromatic hydrocarbons indine, phthalic anhydride and polynuclear aromatic hydrocarbons, carbonic acid derivatives, during polycondensation with formalin, a weak cation, polynuclear polymethylenearomatic carbonic acid was obtained. and IR-spectrum, TGA and DTA analytical methods were compared [4].

Results: The tar product was separated into different fractions using a vacuum drive device, and the anthracene homologues were isolated from the obtained products by recrystallization. An IR spectrum of the final product was obtained and the results are shown below [5,6].

The tar-product was divided into fractions by plowing and their composition was studied. 1-methylanthracene, 2-methylanthracene, 9-methylanthracene make up 80% of the fraction between 320-350oC, 2,7-dimethylanthracene makes up 48% of the fraction at 360-370^oC [7,8].

Figure 3. Results of comparison of the IR spectrum of polynuclear arenes with the base. 1) 1-methylanthracene, 2) 2-methylanthracene, 3) phenanthrene, 4) 9-methylanthracene

IR spectrum analysis of polynuclear arenes. Thermal stability of cationite was studied by thermogravimetric method. It was found that the resulting cationite loses 56.07% of its total mass when heated to 9000C. The differential thermal curve of studied cationites is represented by two endothermic peaks [9].

Figure 4. TG of cationite - thermogravimetric curve; DTA - differential thermal curve

This endothermic effect can be explained by the thermal destruction of this cationite, which occurred between 450.6-661.2 ^OC and 813.1-877.8 OC. For KU-2 cationite, an endothermic peak with energy absorption is observed at 353–413 K, and its destruction is observed at 423 K [7,8]. Thus, it can be seen that the thermal stability of the anthracene-based cationite is higher than that of the KU-2 cationite[10].

Conclusion: Polymethyleneanthracene carboxylic acids were obtained on the basis of anthracene, a secondary product of hydrocarbon pyrolysis process, and it was found that the linear oligomer of this polymer can be used as a superplasticizer in concrete mixtures, and its spatial polymer can be used as a cationite. IR-spectrum, TGA-DTA analyzes were used to study and analyze the composition, structure and properties of the products obtained as a result of the synthesis. The use of synthesized oligomers with a linear structure as a superplasticizer in concrete mixtures has been studied to increase the plasticity and strength of the intermediate mixture. The cationic property of the synthesized polymethyleneanthracene carbonic acid was studied, and it was put into practice as a cationite in the purification of circulating water in factories from various metal cations.

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