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EU-1/ZSM-5 composite molecular sieve, and catalyst for toluene disproportionation and transalkylation and application of catalyst

A composite molecular sieve, ZSM-5 technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of increasing catalyst costs and increasing catalyst preparation steps, and achieve low catalyst costs and simple preparation methods , the effect of prolonging the service life

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing toluene disproportionation and transalkylation catalysts all use molecular sieve as the carrier, and both need to load a certain amount of active metal components or adopt a special molecular sieve modification method, which increases the preparation steps of the catalyst and increases the cost of the catalyst.

Method used

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  • EU-1/ZSM-5 composite molecular sieve, and catalyst for toluene disproportionation and transalkylation and application of catalyst
  • EU-1/ZSM-5 composite molecular sieve, and catalyst for toluene disproportionation and transalkylation and application of catalyst

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preparation example Construction

[0031] The preparation method of catalyst of the present invention comprises the following contents:

[0032] The hydrogen type EU-1 / ZSM-5 composite molecular sieve is kneaded with inorganic refractory oxide, peptizing acid, extrusion aid, etc., and then dried and calcined to obtain the catalyst. Inorganic refractory oxides can be selected from one or more of alumina, titania, silica, boria, magnesia, zirconia and clay, preferably alumina and / or silica, more preferably alumina . Its precursor can be selected from one or more of boehmite, pseudo-boehmite, diaspore, gibbsite and bayolite, preferably pseudo-boehmite; peptizing acid such as Nitric acid, hydrochloric acid, acetic acid, citric acid, etc., preferably nitric acid; the extrusion aid is a material that is beneficial to extrusion molding, such as graphite, starch, cellulose, celadon powder, etc., preferably celadon powder.

[0033] The preparation process of hydrogen-type EU-1 / ZSM-5 composite molecular sieve is to prep...

Embodiment 1

[0040] (1) Synthesis of EU-1 / ZSM-5 composite molecular sieve

[0041] Add TPAOH, TPABr (mass ratio 1:1), and distilled water to the beaker successively, stir evenly, then add EU-1 molecular sieve seeds, stir for 10 minutes, finally add silica sol, stir for 30 minutes, and then put it into the synthesis kettle. Heated in an oven at 120°C for 48h, filtered the obtained product, washed with distilled water until neutral, dried, and calcined at 550°C for 6h to obtain EU-1 / ZSM-5 composite molecular sieve.

[0042] The ratio of materials in synthetic materials is:

[0043] EU-1 / SiO2 2 (gram / gram)=1.5;

[0044] R / SiO 2 (mol / mol) = 0.3;

[0045] h 2 O / SiO 2 (mol / mol)=55.

[0046] The XRD spectrogram and scanning electron microscope photo of this EU-1 / ZSM-5 composite molecular sieve are as figure 1 , 2 shown. From figure 1 It can be seen that the characteristic peaks of EU-1 molecular sieve and ZSM-5 molecular sieve in the composite molecular sieve are quite obvious. From ...

Embodiment 2

[0053] Take 75 grams of hydrogen-type EU-1 / ZSM-5 composite molecular sieve prepared in Example 1, 104.2 grams of SB powder, and 3.75 grams of scallop powder, mix well, then add 85ml of deionized water and 3.75ml of concentrated nitric acid (66.5w%) Fully knead on a roller compactor to make it into a paste-like plastic, extrude a cylindrical strip with a diameter of 1.5mm on an extruder, dry at 110°C for 8 hours, and then bake at 550°C for 4 hours in an air atmosphere to obtain catalyst C2. The catalyst composition and evaluation results are shown in Table 2.

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Abstract

The present invention discloses an EU-1 / ZSM-5 composite molecular sieve and a toluene disproportionation and transalkylation catalyst and application of the catalyst. In the EU-1 / ZSM-5 composite molecular sieve, a ZSM-5 molecular sieve is embedded around a EU-1 molecular sieve, the EU-1 molecular sieve accounts for 30% to 70% weight percent of the composite molecular sieve, and the molar ratio of silica / alumina is 30 to 50. The toluene disproportionation and transfer catalyst includes the composite molecular sieve. The composite molecular sieve-containing toluene disproportionation and transalkylation catalyst of the present invention has excellent performance in use without carrying metal components, and has relatively high toluene conversion rate, and benzene and xylene (B + C8A) selectivity.

Description

technical field [0001] The invention relates to an EU-1 / ZSM-5 composite molecular sieve, a toluene disproportionation and alkyl transfer catalyst and its application. Background technique [0002] Toluene disproportionation and transalkylation technology is one of the most important processes in large-scale aromatics complexes, the purpose of which is to convert relatively surplus toluene and C 9 Aromatics are converted into benzene and xylenes, which are widely used but in short supply to meet market demand. In the chemical fiber-type modern aromatics complex, the toluene disproportionation unit plays a pivotal role, and its contribution of benzene and xylene accounts for 50% to 70% of the total benzene and xylene in the entire aromatics complex. [0003] Molecular sieve catalysts are usually used for the disproportionation of toluene and the transalkylation of aromatic hydrocarbons. The molecular sieves used in the prior art catalysts include mordenite, Beta molecular sie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C07C15/04C07C15/08C07C6/12
CPCY02P20/52
Inventor 贾立明张志智张喜文刘全杰徐会青王伟
Owner CHINA PETROLEUM & CHEM CORP
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