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Method for preparing ethylbenzene and styrene by side-chain alkylation reaction of toluene with methanol

A technology of alkylation reaction and styrene, applied in the field of preparing ethylbenzene and styrene, can solve the problems of low selectivity of ethylbenzene and styrene, low toluene conversion rate and the like

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that when the catalyst used in the prior art is used for the side chain alkylation reaction of toluene and methanol, there are problems of low toluene conversion rate and low selectivity of ethylbenzene and styrene, and a new catalyst is provided. A method for preparing ethylbenzene and styrene by side-chain alkylation of toluene and methanol, the method has the advantages of high conversion rate of toluene and high selectivity of ethylbenzene and styrene

Method used

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  • Method for preparing ethylbenzene and styrene by side-chain alkylation reaction of toluene with methanol
  • Method for preparing ethylbenzene and styrene by side-chain alkylation reaction of toluene with methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 0.15mol of KHCO 3 Dissolve in 300ml of water to prepare a solution with a concentration of 0.5mol / L and divide it into three equal parts, add 10g of 13X molecular sieve to one of the solutions, stir for 2 hours under the condition of heating an oil bath at a temperature of 60°C, and then Put the filtered molecular sieve into the second part of the solution and stir for 2 hours under the same temperature of 60°C in an oil bath, and then put the filtered molecular sieve into the third part of the solution. Stir under bath heating conditions for 2 hours, place the filtered molecular sieve in an oven at 100°C for 24 hours, take it out and raise the temperature from room temperature to 600°C for 6 hours in a nitrogen atmosphere, and keep the temperature at 600°C for 6 hours to obtain a catalyst material (catalyst I) .

[0016] With catalyst I as reaction catalyst, raw material toluene and methyl alcohol are with molar ratio 5: 1, with 2.0 milliliters / hour (raw material weig...

Embodiment 2～11

[0018] Prepare and evaluate the catalyst according to the various steps and conditions of Example 1, just change the concentration, exchange temperature and solid-liquid weight ratio of the potassium salt solution used in the catalyst preparation process, its composition is listed in Table 1, and its evaluation results are listed in Table 1 2.

[0019] The preparation method of catalyst in each example of table 1

[0020] Numbering

potassium salt

Solution concentration (mol / L)

Exchange temperature (℃)

solid-liquid weight ratio

Example 1

KHCO 3

0.5

60

1∶10

Example 2

KHCO 3

1

50

1∶5

Example 3

KHCO 3

1

80

1∶10

Example 4

KHCO 3

1

90

1∶8

Example 5

KHCO 3

1.5

80

1∶10

Example 6

KHCO 3

2

80

1∶10

Example 7

KHCO 3

2.5

80

1∶10

Example 8

K2...

Embodiment 12～18

[0024] Prepare catalyst according to each step listed in embodiment 1 and the concentration, temperature and solid-liquid weight ratio of embodiment 3, just change evaluation condition, its evaluation condition is listed in table 3, and its evaluation result is listed in table 4.

[0025] Table 3 Different evaluation conditions in each example

[0026] Numbering

Toluene to methanol molar ratio

Reaction temperature (°C)

Reaction pressure (MPa)

Raw material mass space velocity (hour -1 )

Example 3

5∶1

450

0

2

Example 12

0.1∶1

200

0.5

0.5

Example 13

2∶1

350

0.2

1

Example 14

3∶1

400

0.1

3

Example 15

4∶1

500

0

5

Example 16

6∶1

600

0

6

Example 17

7∶1

450

0

8

Example 18

10∶1

600

0

10

[0027] Table 4 Evaluation results under diffe...

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Abstract

The invention relates to a method for preparing ethylbenzene and styrene by side-chain alkylation reaction of toluene with methanol and mainly solves the problems of low toluene conversion rate and low selectivity of ethylbenzene and styrene in the prior art. According to the invention, toluene and methanol are used as raw materials to contact with a catalyst so as to generate ethylbenzene and styrene while the reaction temperature is 200-600 DEG C, the reaction pressure is 0-0.5MPa, weight space velocity of the raw materials is 0.5-10h<-1>. Sylvite is used for ion exchange before using the catalyst used in the reaction. The technical scheme greatly solves the problems and can be used in the industrial production of ethylbenzene and styrene by side-chain alkylation reaction of toluene with methanol.

Description

technical field [0001] The invention relates to a method for preparing ethylbenzene and styrene by side-chain alkylation of toluene and methanol. Background technique [0002] Researchers began to explore the process route of preparing styrene from toluene and methanol 30 years ago. This is mainly because compared with traditional processes, this method has the advantages of wide source of raw materials, low cost, low energy consumption, and less pollution. The use of petroleum and its processed products can also use natural gas. The reaction can be carried out under normal pressure, high temperature and large space velocity. Since Sidorenko et al first used alkali metal ion-exchanged X-type and Y-type zeolites as catalysts in 1967 to successfully synthesize styrene with toluene and methanol, this process route has received extensive attention, and there are more and more related researches. . [0003] According to current reports, the catalysts used in alkylation are mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C15/073C07C15/46
Inventor 高翔唐嘉伟缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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