Side chain alkylation method of toluene with methanol

A technology of alkylation and methanol, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of low selectivity of ethylbenzene and styrene, low conversion rate of toluene, etc., to improve ion exchange degree, Good technical effect, the effect of improving the catalytic effect

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when the catalyst used in the prior art is used for toluene methanol side chain alkylation reaction, there are problems of low toluene conversion rate and low selectivity of ethylbenzene and styrene, and a new toluene methanol is provided Side Chain Alkylation Method

Method used

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  • Side chain alkylation method of toluene with methanol
  • Side chain alkylation method of toluene with methanol
  • Side chain alkylation method of toluene with methanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0018] First, 5.27 grams of sodium metaaluminate (NaAlO 2 ) into 10.8 grams of water, heated and stirred to dissolve to obtain solution A. Then prepare sodium hydroxide and potassium hydroxide mixed alkali solution B according to the following ratio: [embodiment 1], 3.68 gram sodium hydroxide, 20.61 gram potassium hydroxide, 28 gram water; [embodiment 2], 7.36 gram hydroxide Sodium, 15.46 gram potassium hydroxide, 28 gram water; [embodiment 3], 11.04 gram sodium hydroxide, 10.30 gram potassium hydroxide, 28 gram water. Solution A was added to solution B with stirring to obtain solution C. 19.88 grams of sodium silicate (Na 2 SiO 3 9H 2 O) join in 20 grams of water, heat and stir to obtain solution D. Solution D was then added to Solution C with stirring. Transfer the mother liquor to a crystallization tank at 80°C for 1 hour and 93°C for 5 hours to crystallize to obtain crystals, and finally filter and dry the crystals to obtain molecular sieves. Feedstock composition d...

Embodiment 4～6

[0021] First, 5.27 grams of sodium metaaluminate (NaAlO 2 ) into 10.8 grams of water, heated and stirred to dissolve to obtain solution A. Then prepare sodium hydroxide and potassium hydroxide mixed alkali solution B according to the following ratio: [embodiment 4], 9.38 gram sodium hydroxide, 6.47 gram potassium hydroxide, 28 gram water; [embodiment 5], 7.50 gram hydroxide Sodium, 5.17 gram potassium hydroxide, 28 gram water; [embodiment 6], 5.63 gram sodium hydroxide, 3.89 gram potassium hydroxide, 28 gram water. Solution A was added to solution B with stirring to obtain solution C. 19.88 grams of sodium silicate (Na 2 SiO 3 9H 2 O) was added into 31.5 grams of water, heated and stirred to obtain solution D. Solution D was then added to Solution C with stirring. Transfer the mother liquor to a crystallization tank at 80°C for 1 hour and 93°C for 5 hours to crystallize to obtain crystals, and finally filter and dry the crystals to obtain molecular sieves.

[0022]

Embodiment 7

[0024] First, 3.16 grams of aluminum hydroxide was added to an alkaline solution containing 9.93 grams of potassium hydroxide and 11.33 grams of water, heated and stirred to dissolve to obtain solution A. Then prepare mixed alkali solution B of sodium hydroxide and potassium hydroxide according to the following ratio: 4.8 grams of sodium hydroxide, 10.08 grams of potassium hydroxide, and 47.6 grams of water. Solution A was added to solution B with stirring to obtain solution C. 7.8 grams of sodium silicate (Na 2 SiO 3 9H 2 O) join in 20g gram of water, heat and stir to obtain solution D. Solution D was then added to Solution C with stirring. Transfer the mother liquor to a crystallization tank at 70°C for 1 hour and 93°C for 40 hours to crystallize to obtain crystals, and finally filter and dry the crystals to obtain molecular sieves.

[0025]

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Abstract

The invention mainly relates to a side chain alkylation method of toluene with methanol, and mainly solves the problems of low toluene conversion rate and low ethylbenzene and styrene selectivity when a catalyst used in the prior art is used for side chain alkylation reaction of toluene with methanol. The method adopts the following technical scheme: by taking toluene and methanol as raw materials, the raw materials are enabled to be in contact with an X molecular sieve catalyst under the conditions that the reaction temperature is 200-600 DEG C, the reaction pressure is 0-0.5 MPa and the weight space velocity of the raw materials is 0.5-10 h<-1>, and reaction is performed to generate ethylbenzene and styrene, wherein mol ratio of the toluene to the methanol in the raw materials is (0.1-10):1; the silicon-aluminum mol ratio SiO2 / Al2O3 of the X molecular sieve is 2-3, and the K<+> / (K<+>+Na<+>) is more than 0-90%; and the X molecular sieve catalyst is subjected to ion exchange respectively through at least one of a potassium-ion-containing solution, a rubidium-ion-containing solution or a cesium-ion-containing solution before being used. Thus, the problems are well solved. The method can be used for industrial production of ethylbenzene and styrene preparation through side chain alkylation reaction of toluene with methanol.

Description

technical field [0001] The invention relates to a side chain alkylation method of toluene methanol. Background technique [0002] Alkylation of toluene and methanol is a route with potential application prospects for the production of styrene. In 1967, Sidorenko et al. first used alkali metal ion-exchanged X-type and Y-type zeolites as catalysts to successfully synthesize ethylbenzene and styrene with toluene and methanol. . Compared with the traditional process, this method has the advantages of wide source of raw materials, low cost, low energy consumption, and less pollution. Therefore, once the reaction was reported, people paid attention to it, and the research on this aspect also began to increase. [0003] In the prior art, low-silicon-alumina-ratio X zeolite is mostly prepared in a high-basic water-sodium system or potassium-sodium system, using low-temperature long-term crystallization or low-temperature aging and then temperature-rising crystallization. As discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/86C07C15/46C07C5/333B01J29/08
CPCY02P20/52
Inventor 蒋见缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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