Removal of Trace Olefins from Aromatics over Metal-Halides-Modified Clay and Its Industrial Test

Abstract

Commercial clay modified with metal halides was prepared to remove olefins from aromatics in the laboratory, and its industrial test was conducted. Different amounts of metal-halides-modified clay were made and characterized by XRD and pyridine adsorption followed by FT-IR. The type and nature of active sites in the removal of olefins over the prepared catalysts have been examined. The study of acidic properties of the modified clay revealed that the L acid, especially the weak L acid plays an important role in the reaction. The experimental results revealed that commercial clay modified with metal halides had much better catalytic activity. During Sinopec Qilu company industrial test, modified clay had an effective running time six times as long as that of untreated commercial clay.

Acid properties and catalysis of USY zeolite with different extra-framework aluminum concentration

“…It has been approved that these harmful impurities can be removed by acid-catalyzed alkylation of the appropriate aromatics [3][4]. In commercial plants, the purification process uses the clay treating [5] or the modified clay treatment. But, both of the two methods pose problems such as limited lifetime, pollution and non-reused.…”

Direct syntheses of a promising industrial organic–inorganic hybrid silica containing methanesulphonate

“…where C L and C B are, respectively, the Lewis acid contents and Brønsted acid contents (mol g À 1 ), A L and A B are, respectively, the peak areas at 1450 cm À 1 and at 1550 cm À 1 (Jacobs et al, 1974;Li et al, 2011;Luan et al, 2011). The corresponding calculated concentrations of acid sites are summarised in Table 3.…”

Selection of suitable bentonite and the influence of various acids on the preparation of a special clay for the removal of trace olefins from aromatics

“…In the present study, the most desired type of bentonite was selected among four different mineral samples by virtue of evaluating swelling index, cation exchange capacity, surface area, and suspension stability analyses. Since past studies focused on the preparation of activated clays by adding metal halides or other substances that were really elaborating works, not environmentally friendly, and cost a lot to become an industrial method (Choudhury, 2020;Li et al, 2011;Luan et al, 2011). Four different clays were chosen and the best one was consequently activated by two different acids (HCl and H 2 SO 4 ) for the elimination of olefins from a hydrocarbon mixture.…”