Alkylation of isobutane with butenes under microcatalytic conditions in pulse mode

Alkylation of isobutane with butenes is one of few important petrochemical processes that is still implemented using liquid acids. New highly active solid alkylation catalysts are investigated for century. The development of new rapid methods for testing catalysts will contribute to progress in this area. Therefore, the aim of the work was to test the possibility of conducting a bimolecular reaction of alkylation of isobutane with butenes in a microreactor in a pulsed mode of feeding. A zeolite-containing alkylation catalyst was synthesized and characterized by X-ray diffraction analysis, temperature-programmed desorption of ammonia and low-temperature nitrogen adsorption. Catalytic studies were performed in a microreactor built into the gas chromatograph scheme, which provided online analysis of the reaction products. The isobutane /butenes mixture was fed into the helium carrier gas stream via a loop. Testing was performed at 80, 100, 135 and 1850C. It was found that a significant amount of products is not desorbed by the carrier gas and is retained by the catalyst at reaction temperatures, while an increase in desorption temperature to 3800C promotes removing the products from the catalyst surface. The highest yield of products was 27% at 800C. With increasing the reaction temperature, the yield drops to 15%. It was shown that the developed method of testing of alkylation catalysts is promising for further use in the search for efficient solid-phase alkylation catalysts.

Effects of pore structure of MgO-templated mesoporous carbon on its supported Pt catalysts for reductive alkylation of p-aminodiphenylamine with methyl isobutyl ketone

Mesoporous carbon (MC) was prepared by the nano-MgO template method and used as a support for the preparation of a Pt-based reductive alkylation catalyst.

Support and Catalyst for the alkylation of benzene by ethylene process

<p>A method for preparation of a spherical alumina support with preset porous structure for a catalyst of benzene alkylation with ethylene has been developed. The process of the support manufacture has been adjusted in a pilot installation, and an industrial installation for production of alumina support for the alkylation catalyst has been designed and built at the Shevchenko Plastics Plant (Aktau, Kazakhstan).</p>

Development and Industrialization of the Ethylbenzene Production Technologies from Dilute Ethylene in FCC Dry Gas

This article demonstrates the design and industrial operation results of the ethylbenzene(EB) production technology from FCC dry gas by a combination of gas-phase alkylation and liquid-phase transalkylation, developed and commercialized by Dalian Institute of Chemical Physics (DICP), CAS. Based on the high active modified ZSM-5/ZSM-11 co-crystalline zeolite alkylation catalyst and modified β zeolite transalkylation catalyst, both the alkylation and transalkylation reactions are performed under much milder conditions, resulting in low energy cost and low content of xylenes impurities in the EB product. Also, the novel process for EB production, developed by DICP recently, through alkylation of dilute ethylene with gas-liquid mixed phase benzene and transalkylation feed is optimized. The results show that the transalkylation feed addition into the middle-lower part of the reactor improves the EB selectivity from about 90% to more than 99%, and the alkylation and transalkylation reactions are unified into a single reactor. Moreover, the alkylation reaction temperature decreases from more than 320 °C to about 170 °C, and the content of the xylenes impurities in the EB product is further decreased to less than 100 ppm.