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26.04.2018 Katalizator JSC developed a new grade of catalyst for dehydrogenation of isobutane in fluidized bed

Specialists of Science-Technological and Production Departments, Katalizator JSC developed a new grade of catalyst for dehydrogenation of isobutane in fluidized bed. Catalyst of this grade allows achieving higher yield of isobutylene and lower amount of coke formation during the catalytic process.

Constant improving quality of the produced catalysts is an important priority aimed for a company development. With this background as a result of research and pilot work a new grade of catalyst for dehydrogenation of isobutane into isobutylene in fluidized bed was developed. The using of this product leads to the higher yield of the end product – isobutylene, and to the lower amount of coke formation. Improvement of characteristics was observed both in standard and severe conditions. The last ones show the real conditions which are used during industrial operating of catalyst.

Especially higher regeneration temperature is interesting in the terms of parameter simulating severe conditions of catalyst operating. Indeed in the area of standard (650 °C) and higher regeneration temperature (700 – 730 °C) a new grade of catalyst shows a 3% higher yield of isobutylene (Picture 3) and lower amount of coke formation (Picture 2) within minimum 70 cycles.

Picture 1. The improved activity of new grade catalyst under standard and higher regeneration temperature, Tdehydrogenation = 590 °C.

Picture 2. Lower amount of coke formation while using of new grade catalyst under standard and higher regeneration temperature, Tdehydrogenation = 590 °C.

The detailed study of CO2 emission during the regeneration process of new and old catalyst’s grades shows not only difference in the amount of carbon dioxide (decreasing of area size under curve line for a new grade) but also qualitative difference expressed in absence of bend during 5.4 – 5.7 minutes for a new grade catalyst. Bend points on changing of coke produced on catalyst. It has influence on the efficiency of catalyst regeneration, i.e. more effective catalyst regeneration exercises under higher temperature. (Picture 3)

Picture 3. Comparison of coke burning-out curved lines from the old grade (left figure) and new grade (right figure) catalysts under standard and higher regeneration temperature.

Moreover, it is logically to assume that lower coke formation on a new grade catalyst takes place during dehydrogenation phase.

Therefore using catalyst of new grade in industry allows increasing isobutylene yield and decreasing part of operating costs connected with decoking.

Author: Alexander Kraynov

Editors: Galina Yastrebova, Roman Artemev, Anastasiya Tarasenko