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Rare earth modified ethylbenzene dealkylation catalyst and preparation method thereof

A technology of ethylbenzene dealkylation and rare earth modification, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of long catalyst preparation process and high cost, and achieve high ethylbenzene conversion activity and p-xylene selectivity, improved activity, timely effect of reaction process

Inactive Publication Date: 2018-08-24
TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the catalyst is long, the cost is high, and its catalytic performance still has room for improvement

Method used

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  • Rare earth modified ethylbenzene dealkylation catalyst and preparation method thereof
  • Rare earth modified ethylbenzene dealkylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, modify the EUO molecular sieve and ZSM-5 molecular sieve: prepare a lanthanum acetate solution with a concentration of 0.05mol / L with deionized water, and mix the EUO molecular sieve or ZSM-5 molecular sieve with the lanthanum acetate solution at a solid-to-liquid ratio of 1:5 , impregnated and exchanged at 80°C, then dried at 120°C for 12 hours, and calcined at 500°C to obtain a lanthanum-modified EUO or ZSM-5 molecular sieve catalyst.

[0024] Take 20kg of the prepared rare earth lanthanum modified EUO molecular sieve, 50kg of rare earth lanthanum modified ZSM-5 molecular sieve, and 30kg of alumina powder, and fully mix them. Add 40% of the total mass of the powder with a weight concentration of 2.0% nitric acid aqueous solution and knead, extrude into a cylindrical strip with a diameter of 2.0 mm, dry at 120° C. for 5 hours, and roast at 550° C. in air for 6 hours to obtain a catalyst carrier.

[0025] Get 50 grams of the prepared catalyst carrier, join in 200...

Embodiment 2

[0028] First, EUO molecular sieve and ZSM-5 molecular sieve are modified: the modification method is the same as in Example 1, 20 kg of prepared rare earth lanthanum modified EUO molecular sieve, 50 kg of rare earth lanthanum modified ZSM-5 molecular sieve, alumina powder 30kg, fully mixed. Add 40% of the total mass of the powder with a weight concentration of 2.0% nitric acid aqueous solution and knead, extrude into a cylindrical strip with a diameter of 2.0 mm, dry at 120° C. for 5 hours, and roast at 550° C. in air for 6 hours to obtain a catalyst carrier.

[0029] Take 50 grams of the prepared carrier, add it to 200 milliliters of impregnation solution containing 0.2 grams of chloroplatinic acid and 2.0 grams of ammonium metatungstate, and dynamically impregnate it for 12 hours at room temperature. Calcined at 550°C for 6 hours to obtain the catalyst, numbered cat-2. The catalyst evaluation method is as in Example 1, and the reaction results are shown in Table 1.

Embodiment 3

[0031] First, modify the EUO molecular sieve and ZSM-5 molecular sieve: prepare a cerium nitrate solution with a concentration of 0.1mol / L with deionized water, and mix the EUO molecular sieve or ZSM-5 molecular sieve with the cerium nitrate solution at a solid-to-liquid ratio of 1:2 , impregnated and exchanged at 60°C, then dried at 120°C for 10 hours, and calcined at 600°C to obtain a cerium-modified EUO or ZSM-5 molecular sieve catalyst.

[0032] Take 40kg of the prepared rare earth cerium-modified EUO molecular sieve, 40kg of rare earth cerium-modified ZSM-5 molecular sieve, and 20kg of alumina powder, and fully mix them. Add 40% of the total mass of the powder with a weight concentration of 5.0% nitric acid aqueous solution and knead, extrude into a cylindrical strip with a diameter of 2.0 mm, dry at 120° C. for 5 hours, and roast at 550° C. in air for 6 hours to obtain a catalyst carrier.

[0033]Take 50 grams of the catalyst carrier, add it to 200 milliliters of an impr...

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Abstract

The invention discloses a rare earth modified ethylbenzene dealkylation catalyst and a preparation method thereof. The rare earth modified ethylbenzene dealkylation catalyst is prepared from a rare earth modified molecular sieve, metal oxide and the balance of adhesive, wherein the rare earth modified molecular sieve is prepared from an EUO molecular sieve, a ZSM-5 molecular sieve and one or any combination of oxides of lanthanum, cerium, neodymium, europium, samarium and praseodymium. The preparation process of the catalyst is characterized by loading rare earth metal oxide onto the molecularsieve through ion exchange and then preparing the rare earth modified molecular sieve into the catalyst; the catalyst shows higher ethylbenzene conversion activity and higher selectivity to xylene inthe isomerization reaction of ethylbenzene dealkylation xylene; meanwhile, the loss rate of the xylene is significantly reduced.

Description

technical field [0001] The invention relates to a C8 aromatic hydrocarbon isomerization catalyst and a preparation method thereof, in particular to a rare earth modified ethylbenzene dealkylation catalyst and a preparation method thereof. Background technique [0002] Aromatics complexes usually produce benzene, toluene, and xylene (BTX), among which paraxylene (PX) is the most important. The isomerization of C8 aromatics is an important unit process in the aromatics complex. Its function is to convert non-thermodynamically balanced mixed C8 aromatics, including ethylbenzene, into compositions close to thermodynamic equilibrium, so as to increase the production of C8 aromatics with high industrial application value. Paraxylene (PX). C8 aromatics isomerization technology directly affects the operation of the entire aromatics complex, and its core is catalyst performance. According to the different conversion modes of p-ethylbenzene, C8 aromatics isomerization catalysts can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C5/27C07C15/08
CPCB01J29/80B01J2229/186C07C5/2775C07C15/08Y02P20/52
Inventor 张福如辛莲森窦涛李宁
Owner TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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