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RTH type topology molecular sieve catalyst for dimethyl ether carbonylation reaction and its preparation method and application

A technology of carbonylation reaction and topological structure, which is applied in the direction of molecular sieve catalysts, catalyst activation/preparation, carbon monoxide or formate reaction preparation, etc., can solve the problems of rapid catalyst deactivation and achieve improved life, good shape selectivity, and inhibition The effect of carbon deposition and deactivation

Active Publication Date: 2019-06-28
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature (Catalysis Letters 80 (2002) 175) reported the process of dimethyl ether catalyzed carbonylation of Rh-containing heteropolyacid catalyst, the product is mainly methyl acetate, but the catalyst deactivation is faster

Method used

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  • RTH type topology molecular sieve catalyst for dimethyl ether carbonylation reaction and its preparation method and application
  • RTH type topology molecular sieve catalyst for dimethyl ether carbonylation reaction and its preparation method and application
  • RTH type topology molecular sieve catalyst for dimethyl ether carbonylation reaction and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Aqueous solution of 13.4098g concentration of 20wt% 1,2,3-trimethylimidazolinium hydroxide (represented by "OSDA") was fully stirred with 0.1224g NaOH particles, then 29.3325g water glass (NaOH 2 O: 7.89wt%, SiO 2 : 25.4wt%) was added to the above solution and stirred evenly for 2 hours, then 2.1134g of HY molecular sieve with a silicon-aluminum ratio of 5.2 was added and stirred and mixed, and 31.3973g of deionized water was added and continuously stirred in a sealed container at room temperature for 2 hours until All raw materials are mixed evenly. The silica-alumina mixed sol can be used as a precursor sol for RTH molecular sieve synthesis, and has the following molar composition:

[0024] 0.26Na 2 O: SiO 2 : 0.033A1 2 o 3 :0.14OSDA:20H 2 o

[0025] Put the mixed sol in a rotary oven for dynamic crystallization at 160°C for 6 days, then recover by vacuum filtration, wash with deionized water until the pH value is less than 8.0, then dry at 120°C for 24 hours, a...

Embodiment 2～18

[0028] Same as Example 1, the difference is that the molar ratio of components in the raw material, silicon source and FAU type zeolite and the ammonium salt type used for exchange are different, specifically as shown in Tables 1 and 2, wherein the involved Y zeolite The molecular silicon to aluminum ratio is 5.2, and the molecular silicon to aluminum ratio of X zeolite is 2.8.

[0029] Table 1

[0030]

[0031] Table 2

[0032]

[0033]

Embodiment 19

[0035] Samples 1-18 prepared in Examples 1-18 were characterized by XRD to confirm that they were RTH molecular sieves. The instrument used is a PANalytical X’Pert X-ray diffractometer, a copper target, and a Kα radiation source. The operating voltage of the instrument is 40kv, and the operating current is 40mA. The obtained XRD spectra of samples 1-18 and the characteristic spectra of standard RTH molecular sieves Figure 1 Sincerely. Typical XRD patterns (such as figure 1 ) is represented by sample 1, and the positions and peak intensities of the main diffraction peaks at 2θ between 5° and 50° are shown in Table 3. Compared with sample 1, other sample data results have the same diffraction peak position and shape, and the relative peak intensity fluctuates within ±5% according to the change of synthesis conditions, indicating that the synthesized product has the characteristics of RTH molecular sieve structure.

[0036] table 3

[0037]

[0038]

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Abstract

The invention discloses an RTH type molecular sieve catalyst for dimethyl ether carbonylation reaction and a preparation method thereof. Organic template agent (OSDA) and NaOH solution are formed into a mixed solution, silicon source is added thereto and mixed evenly, and then FAU type is added. The structural silica-aluminum zeolite provides a silicon source and an aluminum source and is stirred to form a mixed sol. It is dynamically crystallized at 140-180°C for 3-30 days and then recovered. It is then activated by ammonium ion exchange, drying and roasting to obtain RTH with two-dimensional eight-membered ring channels. Type molecular sieve topology, used as a catalyst for the carbonylation reaction of dimethyl ether. The molecular sieve catalyst of the present invention has a unique size pore structure and a catalytic shape-selective effect, so that the carbonylation of dimethyl ether to produce methyl acetate has a high conversion rate and selectivity, and at the same time greatly improves the catalyst life.

Description

technical field [0001] The invention relates to a catalyst for producing methyl acetate by carbonylation of dimethyl ether and its preparation method and application. Specifically, an RTH type topological structure molecular sieve catalyzes the carbonylation reaction process of dimethyl ether to produce methyl acetate. Background technique [0002] Dimethyl ether is an excellent chemical product, which can be used as a raw material for further synthesis reactions and catalytic conversion to produce high value-added chemicals, such as the carbonylation of dimethyl ether to produce methyl acetate and acetic acid, which is the trend of effective utilization of dimethyl ether. Both technology and resource economy have strong competitiveness. [0003] Patent DE3606169 invented a cobalt-containing X and Y molecular sieve as a catalyst for the carbonylation reaction of methanol and dimethyl ether mixed gas, and the products are mainly acetic acid and methyl acetate. Patent US57636...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J35/10B01J37/08C07C67/37C07C69/14C01B39/04
CPCC01B39/04C07C67/37B01J29/70B01J37/0018C01P2002/72B01J35/60C07C69/14
Inventor 王志光李进王炳春王建青刘宇婷刘国东王庆吉史振宇
Owner CHINA CATALYST HLDG CO LTD
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