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Catalyst for side-chain alkylation of toluene and methanol, method for preparing styrene

An alkylation reaction and catalyst technology, applied in the field of styrene preparation and catalyst, can solve the problems of low toluene conversion rate and methanol decomposition, and achieve the effects of improving reaction activity, improving stability and improving hydrothermal stability.

Active Publication Date: 2020-08-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the process also has problems such as low toluene conversion rate and severe methanol decomposition.

Method used

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  • Catalyst for side-chain alkylation of toluene and methanol, method for preparing styrene
  • Catalyst for side-chain alkylation of toluene and methanol, method for preparing styrene
  • Catalyst for side-chain alkylation of toluene and methanol, method for preparing styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 Alkali metal ion-doped ordered mesoporous molecular sieve catalyst sample B-1 # ~B-8 # preparation of

[0075] Sample preparation steps of ordered mesoporous molecular sieve catalyst doped with alkali metal ions:

[0076] Weigh 29.84g of sodium silicate and 7.64g of cetyltrimethylammonium bromide, add deionized water and heat to 35°C under stirring to dissolve;

[0077] Add it to 250mL of nitrate solutions of different alkali metal ions and mix evenly. After continuing to stir for 30 minutes, transfer the resulting solution to a reaction kettle and place it in an oven at 145°C for hydrothermal crystallization for 48 hours.

[0078] After cooling to room temperature, the product was filtered, washed, dried at 110°C, and then heated at 2°C / min to 550°C for 4 hours in an air atmosphere to obtain MCM-41 molecular sieve samples doped with different alkali metal ions, respectively denoted as B-1 # ~B-8 # .

[0079] Obtained sample B-1 # ~B-8 # After being gro...

Embodiment 2

[0083] Embodiment 2 is used for the preparation step of the catalyst of toluene methanol side chain alkylation reaction

[0084] The metal oxide is loaded onto the surface of the MCM-41 molecular sieve doped with alkali metal ions, and the preparation steps are as follows:

[0085] Weigh 50g of MCM-41 molecular sieve doped with alkali metal ions, divide it into several parts according to the mass, and then impregnate and add an aqueous nitrate solution corresponding to the metal oxide by equal volume.

[0086] Soak overnight at room temperature, dry the resulting mixture at 110°C, then heat up to 550°C for 4 hours in an air atmosphere at 10°C / min. Reserved. The supported metal oxides are numbered C-1 according to the type of different metal oxides # ~C-8 # .

[0087] Table 2 shows the numbers of the supported metal oxides, the types of supported metal oxides, the mixing mass ratio, and the loading amount. The mixing ratio is calculated according to the mass of the support...

Embodiment 3

[0090] Embodiment 3 catalyst sample CAT-1 # ~CAT-16 # Evaluation

[0091] Mesoporous molecular sieve sample B-1 doped with alkali metal ions # ~B-8 # Combinations with supported metal oxides are listed in Table 3.

[0092] Obtain catalyst sample CAT-1 with reference to the method in embodiment 2 # ~CAT-16 # .

[0093] 1.2 g of the selected samples were packed in the constant temperature zone of a small fixed-bed reactor, and quartz sand was filled at both ends of the reactor.

[0094] table 3

[0095]

[0096]

[0097] After filling the reactor, the catalyst bed was first activated at 550°C for 1 hour under a helium atmosphere (40ml / min), then cooled down to the reaction temperature, and the raw materials toluene and methanol were introduced with a micro feed pump, and the feed moles of toluene and methanol were The ratio, space velocity, reaction pressure and reaction temperature are shown in Table 4.

[0098] The product was detected by an Agilent 7890A gas ch...

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Abstract

The invention discloses a catalyst for side-chain alkylation of toluene and methanol and a preparation method for styrene. The catalyst comprises: an ordered mesoporous molecular sieve catalyst and an oxygen-free methanol dehydrogenation catalyst; the ordered mesoporous molecular sieve catalyst doped with alkali metal ions. On the one hand, the catalyst utilizes the good dehydrogenation performance of the methanol anaerobic dehydrogenation catalyst to produce formaldehyde as a real alkylation agent; on the other hand, it utilizes the excellent side chain alkylation performance of the alkali metal ion-modified mesoporous molecular sieve catalyst, The products styrene and ethylbenzene are obtained, thereby obtaining higher conversion rate of toluene and selectivity of styrene-ethylbenzene. Another aspect of the present invention also provides a styrene preparation method using the catalyst.

Description

technical field [0001] The invention relates to a catalyst for side-chain alkylation of toluene and methanol and a method for preparing styrene, belonging to the field of chemical industry. Background technique [0002] Styrene (ST), as an important aromatic chemical, is mainly used in the production of polystyrene (PS), expanded polystyrene (EPS), acrylonitrile-butadiene-styrene resin (ABS), styrene- Butadiene rubber (SBR) and other chemical products. [0003] At present, the mainstream technology for industrial production of styrene is the dehydrogenation of ethylbenzene, which includes two steps of alkylation of benzene and ethylene to produce ethylbenzene and dehydrogenation of ethylbenzene to produce styrene. In addition to the long process flow, the ethylbenzene dehydrogenation method also has problems such as many side reactions, high energy consumption, and excessive dependence on petroleum resources, making the development of new styrene production processes a rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/04C07C15/46C07C2/86
CPCB01J23/002B01J29/041B01J29/043B01J29/044B01J2229/183B01J2229/186C07C2/864C07C2529/04C07C15/46Y02P20/52
Inventor 徐力许磊李沛东韩乔袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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