Method for preparing styrene through side chain alkylation of methylbenzene and synthesis gas

A technology for synthesis gas and styrene, which is used in chemical instruments and methods, carbon compound catalysts, and condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, etc. The problem is to improve the ratio of styrene/ethylbenzene, facilitate large-scale industrial production, and achieve high toluene conversion.

Inactive Publication Date: 2017-01-04
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

Due to the large amount of methanol decomposition in this process, and the hydrogen transfer reaction between styr

Method used

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  • Method for preparing styrene through side chain alkylation of methylbenzene and synthesis gas
  • Method for preparing styrene through side chain alkylation of methylbenzene and synthesis gas
  • Method for preparing styrene through side chain alkylation of methylbenzene and synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation of embodiment 1 basic molecular sieve sample

[0057] The alkali metal type molecular sieves used in the examples were purchased commercially. Using ion exchange and / or equal volume impregnation method, the basic molecular sieve is modified with a compound containing toluene conversion promoting elements; the specific steps are:

[0058] ion exchange method : Take 15g of molecular sieves and place them in 100mL of ion-exchange liquid containing toluene transformation-promoting element compounds, exchange at 80°C for 2 hours, exchange 4 times according to the same steps, and then wash with deionized water until the filtrate reaches neutrality, at 120°C Dry overnight, and bake in air at 500°C for 5 hours. The samples are pressed into tablets, crushed and sieved into 20-40 meshes for later use.

[0059] Equal volume impregnation : First vacuumize the carrier to be impregnated, and then use deionized water to measure the saturated adsorption capacity of ...

Embodiment 2

[0063] The preparation of embodiment 2 metal oxide samples

[0064] OX-1 # Preparation of:

[0065] Take 8.2g Zn(NO 3 ) 2 ·6H 2 O, 6.3g Cr(NO 3 ) 3 9H 2 O, 7.5g Al(NO 3 ) 3 9H 2 O, 0.9g Cu(NO 3 )·3H 2 The metal salt of O was dissolved in 100mL deionized water, and under high-speed stirring at 70°C, 1mol / L Na 2 CO 3 The pH of the solution was adjusted to 7, aged at 80°C for 5 hours, filtered, washed, dried overnight at 120°C, and roasted at 520°C for 2 hours. The samples were pressed into tablets, crushed and sieved into 20-40 meshes for later use. The obtained samples were recorded as OX- 1 # .

[0066] OX-2 # ~OX-5 # Preparation of:

[0067] The specific experimental steps are the same as OX-1 # The preparation of the metal salt, the relationship between the type and amount of the metal salt and the precipitant solution and the sample number are shown in Table 2.

[0068] Table 2

[0069]

Embodiment 3

[0070] The element composition analysis of embodiment 3 basic molecular sieve sample and metal oxide sample

[0071] Sample Z-1 by XRF # ~Z-6 # and sample OX-1 # ~OX-5 # The element composition of is analyzed, and the result is as shown in table 3 and table 4:

[0072] table 3

[0073]

[0074] Table 4

[0075] sample Molar ratio of metal elements OX-1 # Zn:Cr:Al:Cu(M):=7.5:4.6:7.1:1 OX-2 # Zn:Cr:Al:Cu(M):=7.1:9.6:9.9:1 OX-3 # Zn:Cr:Al:Ag(M):=7.5:3.9:5.8:1 OX-4 # Zn:Cr:Al:Zr(M):=12.2:17.2:14.4:1 OX-5 # Zn: Cr: Al: Mn (M): = 3.9: 10.2: 8.2: 1

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Abstract

The invention relates to a method for preparing styrene with high selectivity through methylbenzene and synthesis gas. The method comprises the following steps of leading raw gas containing the methylbenzene and the synthesis gas into a reactor, enabling the raw gas to be in contact with a dual-function catalyst after hydrogen reduction, and performing a side chain alkylation reaction to prepare the styrene, wherein the dual-function catalyst comprises an alkaline molecular sieve and a metallic oxide. According to the method disclosed by the invention, the synthesis gas is used for replacing methanol for performing the side chain alkylation reaction of the methylbenzene, so that not only can the cost of raw materials be reduced, a dehydrogenation step in a conventional styrene preparation process is omitted, the energy consumption is reduced, but also a hydrogen transfer reaction of the styrene and the methanol in the side chain alkylation reaction of the methylbenzene and the methanol is avoided, the styrene/ethylbenzene ratio of products is increased, and the method has the characteristics that the methylbenzene conversion rate is high and the selectivity of the styrene in the products is high.

Description

technical field [0001] The invention relates to a new process for producing styrene from toluene and synthesis gas, which belongs to the field of chemical industry. Background technique [0002] Styrene (ST) is the most used chemical product among the derivatives of benzene, and it is also the most basic aromatic chemical, which can be used to manufacture polystyrene (PS), acrylonitrile-butadiene-styrene resin (ABS), hair Foam grade polystyrene (EPS), styrene-butadiene rubber (SBR) and other downstream chemical products. At present, styrene is mainly produced industrially by dehydrogenation of ethylbenzene. The process consists of two steps: the alkylation of benzene and ethylene to produce ethylbenzene and the dehydrogenation of ethylbenzene to produce styrene. It not only has a long process flow, but also has problems such as many side reactions, high energy consumption, and excessive dependence on petroleum resources. Based on the problems existing in the ethylbenzene d...

Claims

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Application Information

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IPC IPC(8): C07C2/86C07C15/46B01J29/16B01J29/64B01J29/78
CPCC07C2/86B01J29/16B01J29/64B01J29/78C07C15/46Y02P20/52C07C2/862B01J29/163B01J29/166B01J29/7815B01J2229/18C07C2529/16C07C2529/64C07C2529/78
Inventor 许磊李沛东徐力袁扬扬张晓敏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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