Modified IM-5 molecular sieves, preparation method therefor, application of modified IM-5 molecular sieves and alkylation reaction method for toluene and methanol

A molecular sieve and IM-5 technology, applied in molecular sieve catalysts, chemical instruments and methods, organic chemistry, etc., can solve problems such as poor stability, low toluene conversion rate, and decreased toluene conversion rate, and achieve long service life and high catalytic activity Effect

Active Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

The results show that although the selectivity of xylene and p-xylene in the toluene-methanol alkylation reaction of the IM-5 molecular sieve after hydrothermal treatment is improved, the activity decreases, and the conversion rate of toluene decreases with the prolongation of the reaction time
[0010] Although the abov...

Method used

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  • Modified IM-5 molecular sieves, preparation method therefor, application of modified IM-5 molecular sieves and alkylation reaction method for toluene and methanol
  • Modified IM-5 molecular sieves, preparation method therefor, application of modified IM-5 molecular sieves and alkylation reaction method for toluene and methanol
  • Modified IM-5 molecular sieves, preparation method therefor, application of modified IM-5 molecular sieves and alkylation reaction method for toluene and methanol

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preparation example Construction

[0024] The preparation method of the H-IM-5 molecular sieve can be prepared according to conventional techniques, such as generally prepared according to the following steps:

[0025] The Na-type IM-5 molecular sieve (NaIM-5 molecular sieve) was subjected to ammonium exchange, then dried and calcined.

[0026] In the preparation process of the H-IM-5 molecular sieve, the ammonium exchange process may include: contacting the Na-type IM-5 molecular sieve with an ammonium nitrate solution. In the ammonium exchange process, the solid-to-liquid ratio (g / mL) of the Na-type IM-5 molecular sieve to the ammonium nitrate solution may be 1:(5-10). The concentration of the ammonium nitrate solution used may be 0.1-0.5 mol / L. Preferably, the ammonium exchange is performed multiple times, for example, 2-4 times, most preferably 3 times. Moreover, each ammonium exchange may be performed for 0.5-5 hours, preferably 1-3 hours, most preferably 2 hours.

[0027] During the preparation pro...

Embodiment approach

[0039] The present invention has no special limitation on the types of the quaternary ammonium cations and quaternary phosphonium cations. Described quaternary ammonium cation can be provided by quaternary ammonium salt and / or quaternary ammonium base, and quaternary ammonium salt and quaternary ammonium base can contain one quaternary ammonium cation, two quaternary ammonium cations, three quaternary ammonium cations or more, preferably contain one or Two quaternary ammonium cations; the quaternary phosphonium cations can be provided by quaternary phosphonium salts and / or quaternary phosphonium bases, which can contain one quaternary phosphonium cation, two quaternary phosphonium cations, three quaternary phosphonium cations or more Multiple, preferably containing a quaternary phosphonium cation. The quaternary ammonium salts, quaternary ammonium bases, quaternary phosphonium salts, quaternary phosphonium bases preferably each contain 8-18 carbon atoms. The quaternary am...

preparation example 1

[0092] SiO 2 / Al 2 o 3 The NaIM-5 molecular sieve with a molar ratio of 38 was ion-exchanged three times with ammonium nitrate solution with a concentration of 0.5mol / L at 80°C, the solid-liquid ratio (g / mL) was 1:8, and the time for each ion exchange was 2 hours. The molecular sieve obtained after the exchange was washed with deionized water, dried at 90°C for 10 hours, and calcined at 550°C for 5 hours to obtain H-IM-5 molecular sieve P-Z 1 (Na 2 O content is less than 0.1% by mass), and the physical and chemical parameters are shown in Table 1.

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Abstract

The invention relates to the field of preparation of molecular sieves and particularly relates to modified IM-5 molecular sieves, a preparation method therefor, an application of the modified IM-5 molecular sieves and an alkylation reaction method for toluene and methanol. The preparation method for the modified IM-5 molecular sieves comprises the steps of subjecting a modifier solution to contactwith H-IM-5 molecular sieves, and then, roasting a solid material obtained through contact, wherein the modifier solution contains quaternary ammonium cations, quaternary phosphonium cations and at least one lanthanide metal compound and is alkaline, and the contact temperature is 70 DEG C to 200 DEG C. According to the modified IM-5 molecular sieves provided by the invention, on the basis of overall weight of the modified IM-5 molecular sieves, by oxides, the phosphorus content is 0.1wt% to 15wt%, and the content of lanthanide metal element is 0.1wt% to 20wt%. By applying the modified IM-5 molecular sieves provided by the invention to an alkylation reaction for the toluene and the methanol, the modified IM-5 molecular sieves have the advantages that the deactivation rate is low, the catalytic activity is high, and the selectivity of dimethylbenzene and trimethylbenzene is good.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a modified IM-5 molecular sieve, a method for preparing a modified IM-5 molecular sieve, a modified IM-5 molecular sieve obtained by the preparation method, and a modified IM-5 molecular sieve in The application in the alkylation reaction of toluene and methanol and a method for the alkylation reaction of toluene and methanol. Background technique [0002] IM-5 molecular sieves were first synthesized by Suk Bong Hong et al. (USP6136290) using pyrrolidine bisquaternary ammonium salt templates. Pore, its pore structure is similar to ZSM-5 molecular sieve, and the molecular sieve also has a 12-membered ring cage structure, which is different from ZSM-5. That The amount of acid and Lewis acid is close to that of TUN structure molecular sieve, The ratio of acid to Lewis acid (B / L) is close to that of ZSM-5 molecular sieve. [0003] IM-5 molecular sieves have shown good...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C2/86C07C15/08C01B39/02
CPCY02P20/52
Inventor 孙敏王永睿慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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