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Modification method of MCM-22 molecular sieve

A technology of MCM-22 and molecular sieve, which is applied in the field of modification of MCM-22 molecular sieve, and can solve the problems of complex acid modification process and poor modification effect

Pending Publication Date: 2021-06-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a modification method of MCM-22 molecular sieve, to solve the problems of complex acid modification process and poor modification effect of molecular sieve catalysts in the prior art

Method used

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  • Modification method of MCM-22 molecular sieve
  • Modification method of MCM-22 molecular sieve
  • Modification method of MCM-22 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Get 10g of HMCM-22 molecular sieve with a silicon-aluminum ratio of 60, put it into the tube furnace of the glow plasma system, vacuumize the tube furnace (<20Pa), and then open the argon gas source (the argon gas flow rate is 50Sccm ), under the atmosphere of argon, heat up to 480 ℃ in 30min, keep the temperature constant, close the argon valve, open the plasma gas source (the gas source is composed of 1% ammonia and 99% argon mixed gas), adjust the flow rate of the mixed gas to 30Sccm, turn on the plasma system, set the plasma power to 200W, and bombard the plasma for 45min to collect the modified HMCM-22.

[0043] In terms of weight percentage, 80% of the modified HMCM-22 molecular sieve and 20% of the binder pseudo-boehmite are mixed and rolled to form a strip, and after drying and roasting, a clover-type MCM-22 molecular sieve catalyst is obtained. for A. Its XRD pattern is as follows figure 1 as shown, figure 2 Its SEM image.

Embodiment 2

[0045] The difference between Example 2 and Example 1 is that the gas source in Example 2 is a mixed gas composed of 0.5% ammonia and 99.5% argon, and the obtained MCM-22 molecular sieve catalyst is denoted as B.

Embodiment 3

[0047] The difference between Example 3 and Example 1 is that the gas source in Example 3 is a mixed gas composed of 1.5% ammonia and 99.5% argon, and the obtained MCM-22 molecular sieve catalyst is denoted as C.

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Abstract

The invention provides a modification method of an MCM-22 molecular sieve. The modification method comprises the following steps: S1, carrying out glow discharge plasma modification treatment on an MCM-22 molecular sieve to obtain a modified MCM-22 molecular sieve, wherein a gas source of plasma is a mixed gas comprising ammonia gas and argon gas, and the mass ratio of the ammonia gas to the mixed gas is 0.5-1.5%; and S2, mixing the modified MCM-22 molecular sieve with a binder, and conducting molding to obtain the MCM-22 molecular sieve catalyst. The mass ratio of the ammonia gas to the mixed gas is more favorable for balancing the physical modification and chemical modification effects, so that the physical modification and the chemical modification achieve a better synergistic effect, and the modified MCM-22 molecular sieve is more favorable for efficiently carrying out the reaction of alkylation of benzene and ethylene to generate ethylbenzene. Compared with a traditional method for directly modifying the molecular sieve by ammonia gas, the modification method of the catalyst has the advantages of simple modification process, high efficiency and low production cost.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for modifying MCM-22 molecular sieves. Background technique [0002] Ethylbenzene is an intermediate in the synthesis of styrene. Styrene is mainly used in the production of organic synthetic materials such as styrene-butadiene rubber, polystyrene, and ABS resin, and is widely used in the fields of construction, automobiles, and electronics. In recent years, with the increase of downstream market demand for styrene, the production of ethylbenzene has been increasing year by year, and the domestic production capacity of styrene has reached 8 million tons per year. [0003] There are three main processes for the alkylation of benzene and ethylene, namely gas phase method, liquid phase method and catalytic distillation method. At present, most new styrene plants use liquid-phase alkylation technology. Compared with the gas-phase method, the liquid-phase method has the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J35/10
CPCB01J29/7038B01J35/61
Inventor 李菁吕建辉田艳明刘长清邓广金侯立波董肇勇刘乃青
Owner PETROCHINA CO LTD