Catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of methanol

A p-xylene and catalyst technology, which is applied in the field of catalysts for efficient synthesis of p-xylene by methanol shape-selective aromatization, can solve the problems of short service life and low xylene selectivity, and achieve high aromatization efficiency

Inactive Publication Date: 2020-01-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a catalyst for efficiently synthesizing p-xylene by methanol shape-selective aromatization to solve the problems of low selectivity and short service life of existing methanol shape-selective aromatization catalysts for p-xylene

Method used

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  • Catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of methanol

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) Take 13.8g of flaky crystals with a thickness of 80nm and a nano-flaky HZSM-22 molecular sieve with a silicon-aluminum atomic molar ratio of 5 and mix them with 1g of alumina binder. After stirring evenly, add an appropriate amount of dilute nitric acid to knead and extrude. , after drying at room temperature, calcined at 500° C. for 1 hour to obtain a strip-shaped catalyst with a cross-sectional diameter of 1.5 mm. Then the above-mentioned shaped unmodified catalyst particles were successively immersed in a certain concentration of magnesium nitrate aqueous solution and silver nitrate aqueous solution for 12 hours, and the loading capacity of magnesium oxide and silver oxide was determined by the water absorption and solution concentration of the unmodified catalyst. The samples were 4.4g and 0.8g, and the impregnated samples were dried at 120°C for 6 hours, and then fired at 500°C for 1 hour. Finally, a nanosheet HZSM-22 molecular sieve catalyst compositely modifie...

Embodiment 2

[0022] 1) Weigh 18.8g of nano needle-shaped HZSM-22 molecular sieve with a silicon-aluminum atomic molar ratio of 500 and acicular crystal cut-off surface diameter of 100nm, mix it with 1g of silicon oxide binder, roll into a ball, and dry it at room temperature , Calcined at 500°C for 1 hour to obtain spherical catalyst particles with a diameter of 1.5mm. Then the unmodified catalyst of above-mentioned gained shaping is successively respectively in the gallium nitrate of certain concentration and the excessive immersion of lanthanum nitrate aqueous solution for 12 hours, determine the loading capacity of gallium oxide and lanthanum oxide respectively by the water absorption of unmodified catalyst and solution concentration: 0.16g and 0.04g, the impregnated samples were dried at 120°C for 6 hours, and then calcined at 500°C for 1 hour. Finally, a nanoacicular HZSM-22 molecular sieve catalyst compositely modified with 0.8wt% gallium oxide and 0.2wt% lanthanum oxide was prepared...

Embodiment 3

[0025]1) Weigh 10.8g of nano-flaky HZSM-22 molecular sieves with a silicon-aluminum atomic molar ratio of 2 and a flaky crystal thickness of 300nm, and 3g of nanoneedles with a silicon-aluminum atomic molar ratio of 40 and acicular crystal cut-off diameter of 500nm HZSM-22 molecular sieves were mixed, and then 6g of silica binder was added, kneaded, extruded into strands, dried at room temperature, and roasted at 500°C for 1 hour to obtain strip-shaped catalyst particles with a cross-sectional diameter of 1.5mm. Then the above-mentioned shaped unmodified catalyst particles were successively immersed in a certain concentration of ferric nitrate and cerium nitrate aqueous solution for 12 hours, and the loading capacity of iron oxide and cerium oxide was determined by the water absorption and solution concentration of the unmodified catalyst. 0.14g and 0.06g, the impregnated samples were dried at 120°C for 6 hours, and then calcined at 500°C for 1 hour. A hybrid molecular sieve (...

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Abstract

The invention discloses a catalyst for efficiently synthesizing p-xylene through shape-selective aromatization of methanol, wherein the catalyst comprises 69-94wt% of a short-pore HZSM-22 molecular sieve with a special morphology, 5-30 wt% of a binder and 1-26 wt% of a modification auxiliary agent. Compared with the catalyst in the prior art, the catalyst of the invention is a short-pore-channel shape-selective catalyst, particularly has high aromatization efficiency, can effectively inhibit the generation of byproducts such as benzene, toluene, o-xylene / m-xylene, C9+ aromatic hydrocarbons andthe like and the generation of rapid coking and carbon deposition, shows extremely high p-xylene selectivity and long service life, can effectively improve the yield of p-xylene and reduce the regeneration and replacement frequency of the catalyst, and greatly improves the technical economy of the synthetic route.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for efficiently synthesizing p-xylene through methanol shape-selective aromatization and an application method thereof. Background technique [0002] P-xylene is one of the most important basic raw materials of bulk aromatic hydrocarbons in the world, and is widely used in polyester synthesis, pesticides, dyes, medicines and other fields. In recent years, with the sustained and rapid development of the polyester industry and the fine chemical industry, the demand for p-xylene is growing rapidly year by year. Its current main commercial production methods are xylene isomerization separation and toluene shape-selective disproportionation based on petroleum route. On the one hand, these two processes have the problems of low yield of p-xylene and low utilization rate of toluene raw materials respectively; on the other hand, the depletion of global oil resou...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J29/74B01J29/76B01J29/78C07C1/20C07C15/08
CPCB01J29/7484B01J29/7092B01J29/7684B01J29/7884C07C1/20B01J2229/18C07C2529/70C07C2529/74C07C2529/76C07C2529/78C07C15/08Y02P20/52Y02P20/584
Inventor 李军辉宋剑红龚清
Owner XIANGTAN UNIV
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