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

A composite molecular sieve, EU-1 technology, applied in the field of EU-1/Beta composite molecular sieve, can solve the problems of increasing catalyst preparation steps, increasing catalyst cost, etc., achieving the effects of low catalyst cost, reducing secondary reactions and improving selectivity

Active Publication Date: 2014-08-20
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/Beta composite molecular sieve, and catalyst for toluene disproportionation and transalkylation and application of catalyst
  • EU-1/Beta composite molecular sieve, and catalyst for toluene disproportionation and transalkylation and application of catalyst

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preparation example Construction

[0016] A kind of preparation method of EU-1 / Beta composite molecular sieve of the present invention comprises the steps:

[0017] (1) Mix EU-1 molecular sieve, silicon source, aluminum source, alkali, water and templating agent uniformly according to the ratio to obtain a gel. The ratio of each component in the gel is calculated as follows (in the distribution ratio of each component SiO 2 and Al 2 o 3 SiO as oxide in silicon source and aluminum source 2 and Al 2 o 3 content, excluding SiO in terms of oxides in EU-1 molecular sieves 2 and Al 2 o 3 ):

[0018] EU-1 / SiO2 2 (gram / gram)=0.17~0.40;

[0019] R / SiO 2 (mol / mol)=0.36~0.54;

[0020] SiO 2 / Al 2 o 3 (mol / mol)=38~148;

[0021] Na 2 O / SiO 2 (mol / mol)=0.45~0.54;

[0022] h 2 O / SiO 2 (mol / mol)=20~33;

[0023] Preferably:

[0024] EU-1 / SiO2 2 (gram / gram)=0.17~0.40;

[0025] R / SiO 2 (mol / mol)=0.45~0.54;

[0026] SiO 2 / Al 2 o 3 (mol / mol)=63~125;

[0027] Na 2 O / SiO 2 (mol / mol)=0.45~0.54;

...

Embodiment 1

[0043] (1) Synthesis of EU-1 / Beta Composite Molecular Sieve

[0044] Add sodium aluminate, distilled water, and tetraethylammonium hydroxide successively into the beaker, stir evenly, then add EU-1 molecular sieve, stir for 10 minutes, finally add white carbon black, stir for 30 minutes, and then put it into the synthesis kettle.

[0045] The ratio of materials in synthetic materials is:

[0046] EU-1 / SiO2 2 (g / g) = 0.35;

[0047] R / SiO 2 (mol / mol) = 0.50;

[0048] SiO 2 / Al 2 o 3 (mol / mol)=112;

[0049] Na 2 O / SiO 2 (mol / mol) = 0.52;

[0050] h 2 O / SiO 2 (mol / mol)=32.

[0051] The synthetic material was heated in an oven at 140°C for 4 days, the obtained product was filtered, washed with distilled water until neutral, dried, and calcined at 550°C for 5 hours to obtain EU-1 / Beta composite molecular sieve.

[0052] The XRD spectrum of this EU-1 / Beta composite molecular sieve is as figure 1 shown. It can be seen that the characteristic peaks of EU-1 molecular sie...

Embodiment 2

[0060] Take 75 grams of hydrogen-type EU-1 / Beta composite molecular sieve A 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%) in the mill Fully knead on the press to make it into a paste-like plastic, extrude a cylindrical rod with a diameter of 1.5mm on the 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 invention discloses an EU-1 / Beta composite molecular sieve, and a catalyst for toluene disproportionation and transalkylation and the application of the catalyst. The EU-1 / Beta composite molecular sieve has crystal phases of an EU-1 molecular sieve and a Beta molecular sieve. The structure of the composite molecular sieve is that the Beta molecular sieve tightly wraps around the EU-1 molecular sieve, wherein the EU-1 molecular sieve accounts for 30% to 70% weight percent of the composite molecular sieve. The catalyst for toluene disproportionation and transalkylation of the invention includes the above EU-1 / Beta composite molecular sieve, and the EU-1 / Beta composite molecular sieve accounts for 40% to 95% weight percent of the catalyst. The composite molecular sieve-containing catalyst for toluene disproportionation and transalkylation of the 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 / Beta composite molecular sieve, a toluene disproportionation and alkyl transfer catalyst using the composite molecular sieve 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 in...

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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