CATALYTIC AROMANICATION OF PROPANE MIXTURE

ABSTRACT

In the article, the composition and catalyst yield of the liquid products of the aromatization reaction to mononuclear and polynuclear arenes in the selected catalysts for aromatization of propane-butane mixture without the presence of oxidants in the presence of a catalyst without the presence of oxidants, and the conversion selectivity of the propane-butane mixture without the presence of oxidants, and a and 0.35 in the study of polynuclear arenes productivity dependence; 0.7; 2.0; 3.0% titanium was carried out. The main parameters of the process of aromatization of propane were studied by absorbing the selected catalyst with a titanium nitrate solution. This article contains 0.35; 0.7; 2.0; 3.0% titanium has been carried out to study the laws of the aromatization reaction of propane by adding titanium nitrate solution to the chosen catalyst to obtain arenes by aromatizing the propane-butane mixture in the presence of a catalyst without the presence of oxidants.

АННОТАЦИЯ

В статье исследованы состав и выход жидких продуктов реакции ароматизации в моноядерные и полиядерные арены на выбранных катализаторах ароматизации пропан-бутановой смеси без присутствия окислителей в присутствии катализатора без присутствия окислителей, а также селективность превращения пропан-бутановой смеси без присутствия окислителей, а также проведено исследование зависимости производительности полиядерных аренов от содержания титана 0,35; 0,7; 2,0; 3,0%. Изучены основные параметры процесса ароматизации пропана путем абсорбции выбранного катализатора раствором нитрата титана. В данной статье содержится 0,35; 0,7; 2,0; 3,0% титана было проведено исследование закономерностей реакции ароматизации пропана путем добавления раствора нитрата титана к выбранному катализатору для получения аренов путем ароматизации смеси пропан-бутан в присутствии катализатора без присутствия окислителей.

Keywords: propane, aromatization, temperature, reaction yield, selectivity, mesoporous sorbent.

Ключевые слова: пропан, ароматизация, температура, выход реакции, селективность, мезопористый сорбент.

INTRODUCTION

The past few decades have seen rapid progress in the conversion of light hydrocarbons into more valuable products. In this regard, conversion of light alkanes to aromatic substances is of great importance in industry. Benzene, toluene and xylene (BTX) are produced by aromatization of light alkanes. BTX aromatic hydrocarbons are considered valuable intermediates in chemical and petrochemical industries. Synthesis of benzene, toluene, and xylene from propane-butane fractions and petroleum gases using a catalyst based on high-silicon sorbents has been thoroughly studied. In addition, in the presence of a catalyst prepared on the basis of high-silicon sorbents, a number of scientific and research works were carried out on the synthesis of ethylene from methane from synthesis gas, methanol and dimethyl ether, and low molecular hydrocarbons from methanol and dimethyl ether.

EXPERIMENTAL PART

In the work, the composition of the liquid products of the aromatization reaction to mononuclear and polynuclear arenes and the catalyst yield (T = 650 ^oC) are presented in Fig. 1.

Study of selected zinc-titanium catalysts for obtaining arenes by aromatizing propane-butane mixtures without the participation of oxidants. 0.35 in the study of the dependence of the conversion selectivity of the propane-butane mixture without the participation of oxidants and the productivity of mononuclear and polynuclear arenes; 0.7; 2.0; 3.0% titanium was carried out, the propane-butane mixture was aromatized in the presence of a catalyst in the presence of a catalyst, and a titanium nitrate solution was added to the selected catalyst to obtain arenes: To compare the properties of the samples in the presence of the catalyst, a temperature of 600 °C was selected at a volume rate of 600 and 650 h^-1. The addition of 0.35% titanium increases the conversion of the propane-butane mixture to 85.2%. When the amount of titanium was increased to 3.5%, a further increase in the activity of the selected catalyst for aromaticizing arenes in the presence of a propane-butane mixture in the presence of a catalyst without the presence of oxidants was observed.

EXPERIMENTAL RESULTS AND THEIR DISCUSSION

0.35 in the composition of the study of the dependence of the conversion selectivity of propane without the participation of oxidizers and the productivity of benzene, toluene, ethylbenzene and xylenes; 0.7; 2.0; was carried out on a catalyst containing 3.0 % titanium. In order to compare the characteristics of the samples in the presence of a catalyst with high catalytic activity and productivity, a temperature of 600 °C was chosen at a volume rate of 600 and 650 h-1. The addition of 0.35% titanium increases the propane conversion to 85.2%. When the titanium content was increased to 3.5%, a further increase was observed in the activity of the catalyst with high catalytic activity and performance selected for the production of aromatic arenes in the presence of a catalyst with high catalytic activity and performance without the presence of propane oxidizers.

In the samples containing 3.5% titanium, the yield of arenes was 58.4-63.3%, raw material conversion was 93.6-94.2%, and selectivity was increased up to 63.2%. Titanium content increased from 0.35 to 3.5 %, the productivity of arenes decreased.

Figure 1. Dependence of aromatization parameters on Ti content at 600°C during aromatization of propane without oxidizing agents

The selectivity of the formation of aromatic products decreases from 73.4 to 63.3% with an increase in the amount of added titanium, and with an increase in methane formation from 24 to 30.8%. The quantitative composition of products of aromatization of propane to benzene, toluene, ethylbenzene and xylenes without the presence of oxidants varies depending on the titanium content of the catalyst selected for aromatization of arenes in the presence of a catalyst with high catalytic activity and productivity without the presence of oxidants. Thus, the content of polynuclear hydrocarbons: benzene increased from 27.0 to 35.4% with an increase in titanium concentration.

CONCLUSION

Thus, the temperature dependence of the conversion, productivity and selectivity of aromatic hydrocarbons in the catalytic dehydroaromatization of propane was shown. The selectivity of the formation of aromatic products decreases from 73.4 to 63.3% with an increase in the amount of added titanium, and with an increase in methane formation from 24 to 30.8%. The quantitative composition of products of aromatization of propane to benzene, toluene, ethylbenzene and xylenes without the presence of oxidants varies depending on the titanium content of the catalyst selected for aromatization of arenes in the presence of a catalyst with high catalytic activity and productivity without the presence of oxidants. Thus, the content of polynuclear hydrocarbons: benzene increased from 27.0 to 35.4% with an increase in titanium concentration..

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