Catalyst for preparing isooctene from isobutene dimers, and preparation method thereof

Abstract

The invention belongs to the technical field of petrochemical products, and particularly relates to a catalyst for preparing isooctene from isobutene dimers, and a preparation method thereof. The preparation method includes the following steps: (1) mixing and stirring petroleum coke and attapulgite before grinding, and screening the powder through a 40-mesh sieve to obtain a powder mixture; (2) dispersing the powder mixture into a solvent, adding metal salt, performing stirring, mixing, ultrasonic dispersion treatment and filtration, soaking filter cakes in a phosphoric acid solution, and performing filtration again to obtain a pre-product; (3) putting the pre-product in a high-temperature sintering furnace, calcinating the pre-product, and naturally cooling the pre-product to the room temperature to obtain the catalyst. The catalyst has the advantages that the petroleum coke is added, and rich carbon elements in the petroleum coke are ablated at a high temperature and gradually shrinkto their pore structures, so that the attapulgite is coated with the carbon elements, and the stability of the prepared catalyst in catalysis of the isobutene dimers is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of petrochemical products, and in particular relates to a catalyst for preparing isooctene by dimerization of isobutene and a preparation method thereof. Background technique [0002] At present, the unrecognized toxicity problems caused by the large-scale use of methyl tert-butyl ether (MTBE) make MTBE in the world may face a situation of either closing down or switching production. For this reason, relevant technical personnel are committed to converting the existing MTBE unit into an indirect alkylation unit for isooctane. [0003] The idea of ​​indirect alkylation is to use isobutene as a raw material to prepare isooctane through dimerization and hydrogenation. Currently, the catalysts for isobutene dimerization used in industry mainly use two types of catalysts: cation exchange resin and solid phosphoric acid. Using cation exchange resin, so it is ideal that the production plant transformed from MTBE t...

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Problems solved by technology

But when using cation exchange resin as catalyst to produce isooctene, the conversion rate of isobutene is lower than the conversion rate when producing MTBE, and the dimerization activity to n-butene is very low; In addition, there are more impurities in the product, and solid Compared with phosphoric acid, it is more prone to fouling and loses activity. In order to obtain higher dimer selectivity, diluents are usually required

[0004] Solid phosphoric acid catalyst is a kind of catalyst widely used in olefin oligomerization. Its advantage is that it has a long service life, which can reach 12 to 16 months, and it also has a high conversion rate of n-butene. The investment cost of production equipment And energy consumption and production cost are relatively small, even if there is no solvent in the reaction process, it can run normally. The disadvantage is that the spent catalyst cannot be regenerated, and the improper operation of the catalyst will cause muddy failure when it is wet. Therefore, in order to maintain the activity of the catalyst, it is best Pretreatment of raw materials to remove moisture and sulfides

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