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Composite catalyst for producing styrene by side-chain alkylation of toluene and methanol, and method for preparing styrene

A technology of alkylation reaction and composite catalyst, which is applied in the chemical industry, can solve the problems hindering the development and application, and achieve the effects of inhibiting the formation of ethylbenzene, high conversion rate of toluene, selectivity of styrene, and high conversion rate of toluene

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

[0005] However, severe methanol decomposition during the side chain alkylation reaction of toluene and methanol and the easy hydrogen transfer reaction between styrene and methanol to form ethylbenzene in the product hinder the further development and application of this process technology.

Method used

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  • Composite catalyst for producing styrene by side-chain alkylation of toluene and methanol, and method for preparing styrene
  • Composite catalyst for producing styrene by side-chain alkylation of toluene and methanol, and method for preparing styrene
  • Composite catalyst for producing styrene by side-chain alkylation of toluene and methanol, and method for preparing styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Embodiment 1 basic molecular sieve catalyst sample B-1 # ~B-8 # preparation of

[0071] Basic molecular sieve catalyst sample B-1 # ~B-8 # The preparation comprises the following steps:

[0072] Get NaX (Si / Al=1.12), NaY (Si / Al=2.63), Naβ (Si / Al=4.52) molecular sieves respectively 100g, then with 0.2mol / L KNO 3 , RbNO 3 , CsNO 3 Precursor solution 250mL, ion exchanged at 80°C, suction filtered, washed, dried at 110°C, then heated to 550°C for 4 hours in air atmosphere at 2°C / min, the obtained solid was ground and pressed into tablets, Crushed and sieved into 20-40 mesh for later use, the obtained sample number is B-1 # ~B-8 # .

[0073] The obtained sample number, ion exchange liquid type, concentration, exchange times and ion exchange degree are shown in Table 1.

[0074] Adopt XRF elemental analysis to carry out elemental analysis to gained sample, analysis obtains before and after ion exchange step in step 2), sample B-1 # ~B-8 # of sodium content.

[00...

Embodiment 2

[0079] Embodiment 2 supported boron catalyst sample C-1 # ~C-8 # preparation of

[0080] Supported boron catalyst sample C-1 # ~C-8 # The preparation comprises the following steps:

[0081] 1) In an air atmosphere at 550° C., calcining the impregnated mesoporous support for 6 hours and then cooling down to room temperature. Weigh 50 g of the calcined carrier, add an aqueous solution of boric acid equal to the volume of the carrier for impregnation.

[0082] 2) Soak overnight at room temperature, dry the resulting mixture at 110°C, then heat up to 550°C at 2°C / min and roast for 4 hours in an air atmosphere. Prepare sample C-1 for 20-40 mesh # ~C-8 # .

[0083] Sample C-1 # ~C-8 # The preparation of the mesoporous support and the loading amount of boron are shown in Table 2, and other parameters are as described above in the sample preparation steps of the supported boron catalyst.

[0084] Table 2

[0085] sample carrier Boron loading (mass) C-1 # ...

Embodiment 3

[0086] Embodiment 3 catalyst sample CAT-1 # ~C AT-16 # preparation of

[0087] In the prepared basic molecular sieve catalyst B-1 # ~B-8 # Select a sample in the same time in the prepared supported boron catalyst C-1 # ~C-8 # Select a sample from the sample, and then fill it in the constant temperature zone of the small fixed-bed reactor according to the ratio in Table 3, and fill the quartz sand at both ends of the reactor.

[0088] Table 3 shows the numbers of the basic molecular sieve catalyst samples and the numbers of the supported boron catalyst samples selected for the sample combination of each experiment.

[0089] table 3

[0090]

[0091]

[0092] After filling the reactor, the catalyst bed was first activated under a helium atmosphere (40mL / min) at 550°C for 1h, then cooled to the reaction temperature, and the raw materials toluene and methanol were fed in with a micro feed pump, and the molar ratio of toluene to methanol was , space velocity, reaction ...

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Abstract

The invention discloses a composite catalyst for producing styrene by side-chain alkylation of toluene and methanol, and a method for preparing styrene. The catalyst comprises: a basic molecular sieve catalyst and a loaded boron catalyst. When the composite catalyst is used in the side chain alkylation reaction of toluene and methanol, it can effectively control the decomposition of methanol and the hydrogen transfer reaction between styrene and methanol during the reaction process, inhibit the production of ethylbenzene, and obtain a higher conversion of toluene rate and styrene selectivity. Another aspect of the present invention also provides a styrene preparation method using the catalyst.

Description

technical field [0001] The invention relates to a composite catalyst for preparing styrene by side-chain alkylation of toluene and methanol and a preparation method for styrene, which belong 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. The above problems make the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08B01J29/70B01J29/80C07C2/86C07C15/46
CPCB01J21/08B01J29/03B01J29/082B01J29/084B01J29/70B01J29/7007B01J29/80B01J35/0006B01J2229/18C07C2/864C07C2529/08C07C2529/70C07C2529/80C07C15/46Y02P20/52
Inventor 许磊徐力李沛东韩乔袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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