Synthesis method of sec-butylbenzene

A technique for the synthesis of sec-butylbenzene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., and can solve the problems of unstable synthesis catalyst activity and low selectivity of sec-butylbenzene

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the activity of the synthetic catalyst containing molecular sieve sec-butylbenzene in the prior art is unstable, and the selectivity of sec-butylbenzene is not high. A new type of alkylation catalyst containing at least aluminum-rich β molecular sieves with high conversion rate and high selectivity for sec-butylbenzene, which has industrial prospects. S-butylbenzene, high-purity sec-butylbenzene products can be obtained in high yield through rectification and other processes

Method used

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  • Synthesis method of sec-butylbenzene
  • Synthesis method of sec-butylbenzene
  • Synthesis method of sec-butylbenzene

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1: the sec-butylbenzene synthesis when using butene-1 as C4 raw material

[0020] 20g of cylindrical (diameter 1mm) containing at least aluminum-rich β molecular sieve catalyst (60% (mass fraction) molecular sieve / 40% (mass fraction) binder, etc.) In the tubular reactor with a single bed, the gaps at both ends of the catalyst in the reactor are filled with quartz sand. After filling the reactor system with benzene, gradually increase the temperature and pressure. When the reaction temperature reaches 145°C and the reaction pressure reaches 2.0MPa, butene-1 (with isobutene content less than 0.5%) is cut into the reactor, and the weight hourly space velocity is controlled for 3h -1 and benzene molar ratio is 3 under the condition of sec-butylbenzene synthetic reaction, along with the change of butene-1 conversion rate, change reaction conditions appropriately, for example, can increase reaction temperature etc. when the conversion rate of carbon four olefins ob...

Embodiment 2

[0023] Embodiment 2: Use mixed n-trans-butene-2 ​​to synthesize sec-butylbenzene when it is a carbon four raw material

[0024] 20g of cylindrical (diameter 1mm) containing at least aluminum-rich β molecular sieve catalyst (60% (mass fraction) molecular sieve / 40% (mass fraction) binder, etc.) In the tubular reactor with a single bed, the gaps at both ends of the catalyst in the reactor are filled with quartz sand. After filling the reactor system with benzene, gradually increase the temperature and pressure. When the reaction temperature reaches 148°C and the reaction pressure reaches 2.0 MPa, butene-2 ​​(isobutene content is less than 0.5%, butene-255.2%, trans-butene-2 ​​44.6 %,) cut into the reactor, control the weight hourly space velocity 8h -1 And the molar ratio of benzene is 15, along with the variation of mixed butene-2 ​​conversion ratio, change reaction conditions appropriately, for example, can increase reaction temperature etc. when carbon tetraolefin conversion ...

Embodiment 3

[0027] Example 3: Synthesis of sec-butylbenzene when using mixed butene-1 and n-trans-butene-2 ​​as carbon four raw materials

[0028]50g of cylindrical (diameter 1mm) containing at least aluminum-rich β molecular sieve catalyst (60% (mass fraction) molecular sieve / 40% (mass fraction) binder, etc.) In the tubular reactor with a single bed, the gaps at both ends of the catalyst in the reactor are filled with quartz sand. After the benzene is filled with the reactor system, gradually raise the temperature and boost the pressure. When the reaction temperature reaches 147° C. and the reaction pressure reaches 2.0 MPa, the mixed butene (isobutene content is less than 0.5%, butene-150.2%, butene-2 ​​25.2%, Trans-butene-2 ​​24.2%,) cut into the reactor, control the weight hourly space velocity 5h -1 And the molar ratio of benzene is 8, along with the change of mixed butene-1 and butene-2 ​​total conversion rate, change reaction conditions appropriately, for example, can improve reac...

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Abstract

The invention relates to a synthesis method of sec-butylbenzene. The synthesis method mainly solves the problems that a synthetic catalyst containing molecular sieve sec-butylbenzene in the prior art is instable in activity and low in sec-butylbenzene selectivity. According to the synthesis method, the sec-butylbenzene which do not contain tert-butyl benzene basically can be stably synthesized by optimizing a novel molecular sieve alkylated catalyst under the conditions that the reaction temperature is 100-280 DEG C, the reaction pressure is 1.0-6.0MPa, the space velocity is 0.1-20h<-1> and the molar ratio of benzene to olefin is about 2-20, wherein the novel molecular sieve alkylated catalyst has the capabilities of keeping high conversion rate of hybrid linear butylene and high selectivity of sec-butylbenzene for a long peroid. The sec-butylbenzene with high purity can be obtained by rectification and the like in a high-yield manner, and the synthesis method can be used for industrial production of sec-butylbenzene synthesis.

Description

technical field [0001] The invention relates to the petrochemical industry, in particular to a method for synthesizing sec-butylbenzene. Background technique [0002] As a solvent and an organic raw material or an important chemical intermediate (production of phenol and methyl ethyl ketone), sec-butylbenzene has gradually attracted widespread attention in recent years. [0003] At present, one method of synthesizing sec-butylbenzene is to use AlCl 3 and solid phosphoric acid as a catalyst, butene and benzene are alkylated to synthesize sec-butylbenzene. This method not only produces sec-butylbenzene, but also produces different amounts of by-products, mainly isobutylbenzene, tert-butylbenzene, di Butylbenzene and tributylbenzene, of these compounds, dibutylbenzene and tributylbenzene are easily separated from the reaction mixture and this can be followed by transalkylation to produce additional sec-butylbenzene. However, the boiling points of isobutylbenzene, sec-butylben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C2/66
Inventor 曾光乐潘罗其颜刚童莉杜建文余卫勋刘芳彭涛张庆忠
Owner CHINA PETROLEUM & CHEM CORP
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