A kind of modified silica gel catalyst for the reaction of isobutene by methyl tert-butyl ether cracking

A technology of methyl tert-butyl ether and catalyst, which is applied in the field of modified silica gel catalysts, and can solve problems such as separation difficulties and increased product costs

Active Publication Date: 2021-06-08
ANHUI HAIDE PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, it is still a problem to be further solved to suppress the occurrence of several side reactions to the greatest extent.
In particular, the dimethyl ether and methyl tert-butyl ether produced by the dehydration of methanol, one of the cracking products of methyl tert-butyl ether, tend to form azeotropes, which will bring difficulties to the subsequent separation and increase the cost of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of modified silica gel catalyst:

[0024] (1) Activation of silica gel: Add 20 parts of nitric acid to 20 parts of silica gel, heat and reflux for 5 hours, wash with distilled water until neutral, seal and place, then soak in 6N hydrochloric acid at room temperature for 24 hours, then wash with distilled water until neutral , and then dry the treated silica gel in a horse boiling furnace at 120°C for 10 hours to obtain activated silica gel;

[0025] (2) Modification of silica gel: add activated silica gel to absolute ethanol, heat to reflux state, keep warm and stir for 30min, then add 6 parts of glycolic acid and 6 parts of silane coupling agent, reflux and stir for 1h, and naturally cool to room temperature, After filtration, the obtained silica gel was added with 5% sodium carbonate of silica gel quality and stirred evenly, sealed at 3°C ​​and left for 2 hours to obtain modified silica gel;

[0026] (3) Loading of silica gel: Add the modified silica gel ...

Embodiment 2

[0030] Preparation of modified silica gel catalyst:

[0031] (1) Activation of silica gel: Add 25 parts of nitric acid to 25 parts of silica gel, heat and reflux for 5 hours, wash with distilled water until neutral, seal and place, then soak in 6N hydrochloric acid at room temperature for 24 hours, then wash with distilled water until neutral , and then dry the treated silica gel in a horse boiling furnace at 120°C for 10 hours to obtain activated silica gel;

[0032] (2) Modification of silica gel: add activated silica gel to absolute ethanol, heat to reflux state, keep warm and stir for 30min, then add 6 parts of glycolic acid and 6 parts of silane coupling agent, reflux and stir for 1h, and naturally cool to room temperature, After filtration, the obtained silica gel was added with 5% sodium carbonate of silica gel quality and stirred evenly, sealed at 3°C ​​and left for 2 hours to obtain modified silica gel;

[0033] (3) Loading of silica gel: Add the modified silica gel ...

Embodiment 3

[0064] Based on Example 1, set up Comparative Example 1 without adding glycolic acid, Comparative Example 2 without adding silane coupling agent, Comparative Example 3 without adding castor oil, and Comparative Example 4 without adding additives.

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Abstract

The invention discloses a modified silica gel catalyst for the reaction of producing isobutene by cracking methyl tert-butyl ether, and relates to the technical field of catalysts. The preparation method of the catalyst of the present invention includes: activation of silica gel, modification of silica gel, and loading of silica gel; the present invention uses α-hydroxy acid and silane coupling agent to modify silica gel, and utilizes the activation of auxiliary agents to accelerate nano The loading efficiency of titanium dioxide and copper oxide increases the rate of the positive reaction while inhibiting the progress of the side reaction, and significantly improves the yield and purity of isobutene.

Description

Technical field: [0001] The invention relates to the technical field of catalysts, in particular to a modified silica gel catalyst for the reaction of producing isobutylene by cracking methyl tert-butyl ether. Background technique: [0002] Isobutene plays a very important role in the production of organic chemicals and fine chemicals. For example, methacrylic acid is produced by oxidation of isobutene; Butylphenol, isobutylene and isoprene can be polymerized to produce butyl rubber, hydrated to produce tert-butanol, and isobutylene can be polymerized to produce polyisobutylene. The industrial preparation methods of isobutene mainly include: 1. Catalytic cracking by-products, using ZSM-5 and other molecular sieve system cracking catalysts to improve the selectivity of isobutene; 2. Butane isomerization and dehydrogenation process; 3. Skeleton isobutene 4. Tert-butanol water (mainly from the by-product of propylene oxide co-oxidation of propylene and isobutane); 5. Cracking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C07C1/20C07C11/09
CPCB01J31/38C07C1/20C07C2531/38C07C11/09
Inventor 黄帮义
Owner ANHUI HAIDE PETROCHEM
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