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Preparation method of modified Beta molecular sieve catalyst and application thereof

A molecular sieve and catalyst technology, applied in the field of preparation of modified Beta molecular sieve catalysts, can solve the problems of cracking and coking reactions, reduce the yield of effective products of the reaction, etc., and achieve the effects of simple preparation process, improved yield, and improved conversion rate.

Inactive Publication Date: 2016-03-16
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The catalyst for the isomerization and disproportionation of 1-methylnaphthalene is mainly molecular sieves. In the prior art, molecular sieves modified by ammonium ion exchange have a certain amount of strong acid centers on the outer surface, which is easy to cause cracking and coking reactions in the reaction process. , to reduce the yield of effective products in the reaction

Method used

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  • Preparation method of modified Beta molecular sieve catalyst and application thereof
  • Preparation method of modified Beta molecular sieve catalyst and application thereof
  • Preparation method of modified Beta molecular sieve catalyst and application thereof

Examples

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Embodiment 1

[0028] Prepare ST-B-1 catalyst by titanium sulfate modified Beta molecular sieve method: the specific method is: (1) place the activated Beta molecular sieve in a hydrothermal kettle; (2) configure sulfuric acid with a molar concentration of 0.2mol / l Titanium solution; (3) Under constant temperature and pressure, Beta molecular sieve was completely immersed in titanium sulfate solution for 5 hours, wherein the mass ratio of Ti / Beta molecular sieve = 1:10, vacuum dried for 12 hours, and calcined at 550°C for 7 hours to obtain the modified Beta molecular sieve catalyst ST -B-1.

[0029] The isomerization / disproportionation reaction of 1-methylnaphthalene was carried out in a continuous tubular reactor. The results show that the ST-B-1 catalyst prepared by the titanium sulfate modified Beta molecular sieve method has a conversion rate of 1-methylnaphthalene≥61%, and the selection of effective products (2-methylnaphthalene, naphthalene, dimethylnaphthalene) Property ≥ 98%, the yi...

Embodiment 2

[0031] Using the roasting activation method, the ST-B-1 catalyst in Example 1 was subjected to a cycle experiment. The specific method is: after the ST-B-1 catalyst in the embodiment 1 is continuously used in the continuous tubular reactor for 5 hours (TOS=5hr), it is taken out, screened by the mesh sieve method, and recalcined to activate (vacuum drying for 12h, Calcination at 550° C. for 7 h) to obtain a recycled catalyst sample ST-B-2 catalyst. Pack into continuous tubular reactor and carry out repeated experiment, the conversion rate of 1-methylnaphthalene is 58%, the selectivity 98% of effective product (2-methylnaphthalene, naphthalene, dimethylnaphthalene), effective product (2- The yield of methylnaphthalene, naphthalene, dimethylnaphthalene) is 56%. Compared with the catalyst conversion effect of Example 1, Example 2 is not much different, within the error range, indicating that the effect of the ST-B-2 catalyst prepared by the roasting activation method is basically...

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Abstract

The invention discloses a preparation method of a titanous sulfate modified Beta molecular sieve catalyst and application thereof. The method comprises the following steps: (1) putting a roasted and activated Beta molecular sieve into a hydrothermal kettle; (2) preparing a titanous sulfate solution with the mole concentration of 0.1-0.3mol / l; (3) soaking the Beta molecular sieve completely in the titanous sulfate solution at constant temperature and constant pressure, carrying out vacuum drying, and roasting so as to prepare the modified Beta molecular sieve catalyst. The catalyst disclosed by the invention is applied to isomerization and disproportionation of 1-methylnaphthalene; the conversion rate of 1-methylnaphthalene is about 60%, and the selectivity of active products (2-methylnaphthalene, naphthalene and dimethylnaphthalene) is not less than 98%; the modified Beta molecular sieve catalyst can be synthesized by a one-step process; the technology is simple, and the preparation method is suitable for large-scale industrial production; the prepared catalyst can be used for multiple times repeatedly, is high in catalytic activity and selectivity, is long in service life, and is low in cost.

Description

technical field [0001] The invention relates to a Beta molecular sieve catalyst, in particular to a preparation method of a modified Beta molecular sieve catalyst, and the prepared catalyst is applied to the isomerization / disproportionation reaction of 1-methylnaphthalene. Background technique [0002] 2,6-Dimethylnaphthalene (2,6-DMN), which is an extremely important polycyclic aromatic hydrocarbon compound, is an intermediate for the preparation of high-performance polyester, which is oxidized to obtain 2,6-naphthalene dihydroxy acid (2,6-NDA), continue to oxidize, and can further prepare a variety of high-performance plastics and thermotropic liquid crystal polymers (LCP). The conversion (isomerization / disproportionation) of 1-methylnaphthalene into effective products (2-methylnaphthalene, naphthalene, dimethylnaphthalene) is an important raw material for the synthesis of 2,6-dimethylnaphthalene. [0003] The traditional method of preparing 2,6-dimethylnaphthalene is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C07C5/27C07C6/12C07C15/24
Inventor 顾正桂宋振刚孙昊
Owner NANJING NORMAL UNIVERSITY
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