DETERMINATION OF THE QUANTITY OF THE BINDING COMPONENT OF THE SELECTED CATALYST FOR THE PROCESS OF HEATING MONOCHLOROMETHANE AT A HIGH TEMPERATURE

ABSTRACT

In the work, the amount of the selected catalyst binding component was determined for the process of heating monochloromethane at high temperature in the absence of air. In order to determine the amount of the binding component that is selected for the heating process of monochloromethane at high temperature in the absence of air, and the amount of the binding component in the selective catalyst is selected for the purpose of determining the amount of the binding component in the selective catalyst, the amount of the binding component in the selective catalyst increases the concentration of the product and monochloromethane conversion. To implement the process, a catalyst bed reactor with a high catalytic activity and a selective catalyst layer was used at a temperature of 430℃ and a volumetric rate of 1500 coat ^{-1 .} The amount of binding component in the selective catalyst with high catalytic activity selected for the implementation of the process was varied in the range of 30-70 mac.%. The physico-chemical properties of the synthesized, highly active and selective catalyst selected for the process were studied.

The purpose of the work is to select a component with high catalytic activity and a selective catalyst, which is selected for the process of heating monochloromethane at high temperature in the absence of air.

АННОТАЦИЯ

В работе определено количество выбранного связующего компонента катализатора для процесса нагрева монохлорметана при высокой температуре в отсутствие воздуха. Чтобы определить количество связующего компонента, который выбирают для процесса нагревания монохлорметана при высокой температуре в отсутствие воздуха, и количество связующего компонента в селективном катализаторе выбирают с целью определения количества связывающего компонента в селективном катализаторе, количество связующего компонента в селективном катализаторе увеличивает концентрацию продукта и конверсию монохлорметана. Для реализации процесса использовался реактор со слоем катализатора с высокой каталитической активностью и селективным слоем катализатора при температуре 430℃ и объемной скорости 1500 слой -1 . Количество связующего компонента в селективном катализаторе с высокой каталитической активностью, выбранном для реализации процесса, варьировали в пределах 30-70 мас.%. Изучены физико-химические свойства синтезированного, выбранного для процесса высокоактивного и селективного катализатора.

Цель работы – подобрать компонент с высокой каталитической активностью и селективный катализатор, выбранный для процесса нагрева монохлорметана при высокой температуре в отсутствие воздуха.

Keywords: monochloromethane, selective, catalyst, ethylene, propylene, reactor, binder.

Ключевые слова: монохлорметан, селектив, катализатор, этилен, пропилен, реактор, связующее.

Introduction

Al₂O_3, which is used as a binding component, exhibits catalytic activity when heating monochloromethane at high temperature in a vacuum [1]. Monochloromethane in Al₂O₃ has a high catalytic activity selected to carry out the convective process and is typical and 1.5% during 500 minutes of operation of the selective catalyst. Heating monochloromethane in Al₂O₃ at a high temperature in the absence of air results in the production of acocan methane (85 mol.%), the lower molecular unsaturated ethylene series hydrocarbons that are precipitated, i.e. ethylene and propylene, and saturated hydrocarbons C₂-C₅₊ in the amount of 15 mol.% does not increase [2-5].

Testing monochloromethane in airless, high temperature heating of Japan with microspheric YuKS-30/Al₂O₃ composition with high catalytic activity and selective catalyst. Monochloromethane in airless high temperature heating in Japan is effective for lower molecular unsaturated ethylene series hydrocarbons, i.e. ethylene and propylene. It is advisable to use a reactor with a high catalytic activity and a selective catalyst layer, designed for the process [6-8]. Heating monochloromethane in an airless place at high temperature is selected for the process, which has a high catalytic activity and the development of a selective catalyst with an Al₂O₃ binder in an acocid with an Al₂O₃ binder equal to 70:30 YuKTs-30:Al₂O₃ is the process of the YuKTs-30 acoci. A selective catalyst with high catalytic activity was selected for implementation [9-13].

YuKTs-30/Al₂O₃ microsphere with a volume of 40 cm 3 was prepared as a catalyst for the process of heating monochloromethane in an airless place at high temperature [14]. A selective catalyst with high catalytic activity is selected for the process - 0.06-0.12 mm[15-16].

YuKTs-30/Al₂O₃ mixture YuKTs-30-pure active ingredient and YuKTs-30/Al₂O₃ with high catalytic activity selected for the implementation of the process and combined with a selective catalyst were brought (1- table [17].

Table 1.

Physico-chemical properties and composition of microspherical and YuKS-30/Al2O3 selective catalyst with high catalytic activity selected for the process

The information given in Table 1 shows that YuKTs-30 with Al₂O₃ has a high catalytic activity selected for the process, and the surface area of the selective catalyst is much smaller than that of the pure active component of YuKTs-30. The binding component tightly weaves the YuKTs-30 microporous layer, as a result of which Al₂O₃ has a high catalytic activity selected for the process, and the surface of the selective catalyst layer is less dense than the pure active component. A decrease in the amount of acidic centers per unit volume is also associated with hyddi shy. Implementation of the process in YuKS-30/Al₂O₃ microspheres in pseudo-dilution furnace allows for an increase in monochloromethane convection compared to the conversion in YuKS-30/Al₂O₃ with a fixed layer [18-20].

Experimental part

The activity of the selective catalyst layer with high catalytic activity selected for the process decreases to different values during 500 minutes of operation: in YuKTs-30/Al2O3 mikpofepas –36.8%, in YuKTs-30/Al2O3–36.6% , which suggests a similarity in the deactivation of the cell.

The observed reduction of monochloromethane conversion in selective catalysts with high catalytic activity is associated with changes in the physico-chemical structure of YuKTs-30 due to the component of the binder and its gpanylation process. The combination of pure active ingredient - UKTs with high catalytic activity and selective catalyst acid group selected for the implementation of the process makes it possible to reduce the observed decrease in the activity of the product.

Mixing YuKTs-30 with a binding component does not lead to a significant change in the quality of the product, but when combined with YuKTs-30-pure active ingredient, it strongly affects the amount of clay per unit; the volume of YuKTs-30/ Al₂O₃, it increased the initial concentration of monochloromethane to 66%. In both cases, the activity of the catalyst with high catalytic activity selected for the implementation of the process, and with the increase in the selective catalyst operating time, the activity of the catalyst with high catalytic activity selected for the implementation of the catalytic oxidative chlorination process of methane in the presence of air oxygen in the presence of hydrogen chloride for the implementation of the process is observed. In YuKTs-30/ Al₂O₃ 500 minutes after the start of the experiment, monochloromethane concentration decreases to 42%, in YuKTs-30/SiO₂ it decreases to only 36%.

In YuKTs-30/Al₂O₃ and YuKTs-30/SiO₂ in sample the general selectivity for lower molecular unsaturated ethylene series hydrocarbons, i.e. ethylene and propylene, has high catalytic activity selected for the process and after 500 minutes of operation of the selective catalyst, 82 mol.% and reaches 75 mol.%.

Al₂O₃, which has high catalytic activity and selective catalyst, as a binding component, to carry out the heating process at high temperature in an airless place.

Experimental results and their discussion

A series of experiments carried out a catalyst bed process with high catalytic activity selected for the catalytic oxidative chlorination of methane under the influence of hydrogen chloride in the presence of air oxygen to realize a stationary process at a temperature of 430℃ and a volumetric rate of 1500 coat-1 of monochloromethane. Information about laboratory experiments is in the following passage.

Temperature 430℃, volume speed – 1500 coat ^-1

1-YuKTs-30/Al ₂O₃ (70/30); 2-YuKTs-30/SiO ₂ (70/30)

Figure 1. The dynamics of CN₃Cl convective change depending on the duration of the experiment

Al₂O₃ binding agent, which has high catalytic activity and selected for the implementation of the process is added to the selective catalyst composition, which leads to a decrease in the activity of the catalyst.

1^st pure component YuKTs-30; 2-Binding component Al₂O₃ ; 3-YuKTs-30(70) Al₂O₃ (30) 4-YuKTs-30 (30)/Al₂O₃ (70)

Figure 2. Depending on the duration of the experiment, a catalyst with high catalytic activity and a selective catalyst, selected for the implementation of the type process, the binding component and the active component, are the dynamics of the change of the CN₃Cl condenser

According to the results of the research, the interaction process of YuKTs-30 with the binder does not cause a change in the product and its quality. Main products  is C₂ -C₄ lower molecular unsaturated ethylene series hydrocarbons, i.e. ethylene and propylene, and secondary products is C₁-C₅₊ papafinlap. High catalytic activity and selective YuKTs-30/Al₂O₃ composition were chosen for the implementation of the process in the catalyst, with a simultaneous decrease in the polypropylene concentration, a significant increase in the ethylene concentration is observed, but in this case, the decreasing tendency of the total concentration is reversed with an increase in the duration of the experiment.

It should be noted that increasing the amount of the binding component Al₂O₃ to 60 mac.% in a selective catalyst with a high catalytic activity selected for the implementation of the process causes a decrease in the selectivity of ethylene production by no more than 5 mol.%.

The general selectivity of low molecular unsaturated ethylene series hydrocarbons, i.e. ethylene and propylene (ethylene, polypropylene) is present in YuKTs-30-pure active ingredient and YuKTs-30(60)/Al₂O₃ (40) is the selected catalyst for the ongoing process and has a high catalytic activity and is 82 mol.% in 500 min of selective catalyst operation, the increase in the amount of the binding component leads to a significant decrease of the total selectivity to 79 mol.% for lower molecular unsaturated ethylene series hydrocarbons, i.e., ethylene and propylene.

Conclusion

It was found that the catalyst used in Japan for heating monochloromethane at high temperature without air, using Al₂O₃ as a binding component , exhibits catalytic activity.

Al₂O₃ prepared on the basis of YuKTs-30 with catalytic activity and selective catalyst has a much smaller surface area than the pure active component of YuKTs-30.

The overall selectivity of low molecular unsaturated ethylene series hydrocarbons (ethylene, polypropylene) is 82 mol.% in 500 minutes of operation of the YuKTs-30-pure active component and YuKTs-30(60)/Al₂O₃ (40) catalyst. It is the increase in the amount of the binding component leads to a significant decrease of the total selectivity for ethylene and propylene lap up to 79 mol.%.

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