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Soild catalyst containing liquid acid and its prepn

A technology of acid catalyst and catalyst, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of less active centers, easy loss, uneven distribution of acid centers, etc., to avoid product separation , Not easy to lose, evenly distributed effect

Inactive Publication Date: 2004-03-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two commonly used methods, one is to load these liquid acids on the carrier, or use acidic oxides such as molecular sieves, amorphous silica-alumina and other "true" solid acid catalysts, but these two types of catalysts have some disadvantages. One is because the liquid acid is difficult to immobilize, and it is very easy to lose; the latter type of catalyst is due to the uneven distribution of acid centers, fewer active centers, and requires a higher reaction temperature. Therefore, in some reactions that require strong acid or low temperature, For example, it is difficult to replace liquid acid in the alkylation reaction of isobutane and butene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 20 grams of ethyl orthosilicate, 1 gram of ethanol and 5 grams of water in a 100ml beaker, then quickly add 0.5 grams of concentrated sulfuric acid into the above mixed solution, stir at room temperature until a gel is formed, and put it into a vacuum oven together with the beaker , dried under vacuum at 50° C. for 48 hours (vacuum degree is mmHg, the same below), and then stored in a desiccator. Measured acid strength H 0 -12, the measured acid content was 0.3mmol / g, and the reaction performance was evaluated in a fixed-bed reaction system. The reaction results in 8 hours are shown in Table 5. The acid content of the solid acid obtained in this embodiment was 1% by weight before and after the reaction by acid-base titration.

[0035] Olefin Conversion

Embodiment 2

[0037] Mix 10 grams of ethyl orthosilicate and 3 grams of propanol in a 100ml beaker, then quickly add 6 grams of 10% by weight phosphoric acid into the above mixed solution, heat to 70 ° C, stir until a gel is formed, and put it together with the beaker put into a vacuum oven, dry at 50° C. for 48 hours under vacuum, and store the obtained solid acid in a desiccator. The acid strength of the prepared solid acid H 0 <-10, acid content 3mmol / g, alkylation reaction activity was evaluated in a fixed bed reaction system, the results are shown in Table 6. The acid content of the solid acid obtained in this embodiment was 5% by weight before and after the reaction by acid-base titration.

[0038] Olefin Conversion

Embodiment 3

[0040] Mix 10 grams of ethyl titanate and 2 grams of ethanol in a 100ml beaker, then quickly add 8 grams of 40% sulfuric acid aqueous solution to the above mixed solution, stir at 50°C until a gel is formed, and put it into a vacuum oven together with the beaker. Drying treatment at 50° C. for 48 hours under vacuum, and store the obtained product in a desiccator. The acid strength H of the obtained solid acid 0 <-12, acid content 5.1mmol / g. The catalytic activity was evaluated in a fixed-bed alkylation reaction system, and the reaction results for 8 hours are shown in Table 7. The acid content of the solid acid obtained in this embodiment was 33% by weight before and after the reaction by acid-base titration.

[0041] Olefin Conversion

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Abstract

The present invention features that the solid acid catalyst contains liquid acid in 1-80 wt% and solid matter to coat the liquid acid in 20-99 wt%. The solid acid catalyst of the present invention has a large number of acid centers distributed homogeneously and the active centers have the solid shape and the reaction performance of liquid acid. The catalyst is suitable for use in low temperature reaction of non-polar medium.

Description

technical field [0001] The invention relates to an acid catalyst in solid form and a preparation method thereof. Background technique [0002] h 2 SO 4 、H 3 PO 4 , HF and other catalysts are acid catalysts widely used in industry. Some important processes such as alkylation, esterification, isomerization, etc. have used these catalysts or are still in use. Although these acid catalysts have good catalytic activity, because these catalysts are catalyzed under homogeneous conditions, compared with heterogeneous reactions, they bring many disadvantages in production, such as difficult to achieve continuous production in the process , The catalyst is not easy to separate from the raw materials and products, and the equipment is corroded. In addition, in some important chemical processes, the above-mentioned acid catalysts also bring a large amount of by-products. Taking alkylation as an example, the traditional process uses sulfuric acid or hydrofluoric acid as a catalyst ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/02
Inventor 谢文华付强舒兴田闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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