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Method for preparing isopropylbenzene through catalytic hydrogenolysis of alpha,alpha-dimethyl-benzyl carbinol

A technology of dimethylbenzyl alcohol and catalytic hydrogenolysis is applied in the field of preparing cumene and can solve problems such as environmental pollution

Inactive Publication Date: 2018-12-07
崔九香
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that in the process of producing cumene in the existing technology, the use of chromium-containing catalysts causes pollution to the environment. It provides a catalytic hydrogenolysis of α, α-dimethyl benzyl alcohol to prepare isopropyl The benzene method uses α,α-dimethylbenzyl alcohol and hydrogen as raw materials, feeds the raw materials and inert carrier gas into the hydrogenolysis reaction zone, the molar ratio of raw material gas / inert carrier gas is 1:10~20, hydrogen / The molar ratio of α, α-dimethylbenzyl alcohol is 3-15:1, the reaction temperature is 100-200°C, the reaction pressure is 0.2-0.9MPa, and the volume space velocity of the inert carrier gas is 1.0-10.0 hours -1 Under certain conditions, the raw material and the catalyst contact and react to generate cumene; wherein the catalyst used is NiB-Zn / ZIF-8, the molar content of Ni is 0.5-5%; the molar content of Zn is 1-10%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1, the preparation of catalyst

[0030] 1) Dissolve 13mmol nickel nitrate and 260mmol zinc nitrate in 2L N,N-dimethylformamide solvent, then add a certain amount of 273mmol 2-methylimidazole, stir at room temperature for a period of time, transfer to a 100mL reaction kettle, High temperature reaction at 120°C for 36 hours, cooling, suction filtration, and drying to obtain ZIF-8 / ZIF-67 hybrid base material;

[0031]2) Inject 800mL of 1mol / L sodium borohydride aqueous solution into the ZIF-8 / ZIF-67 hybrid material obtained in step 1), stir, and reduce the nickel ions contained therein to obtain suspension B, and let it stand for a while;

[0032] 3) the suspension B after standing in step 2), suction filtration, washing, and vacuum drying to obtain the NiB-Zn / ZIF-8 catalyst, the quality of NiB in the NiB-Zn / ZIF-8 catalyst is ZIF 5.2% of the mass of -8.

[0033] S2, hydrogenolysis reaction

[0034] The catalyst prepared by 40.0ml step S1 is loaded into a fixed-bed reac...

Embodiment 2

[0036] S1, the preparation of catalyst

[0037] 1) Dissolve 50mmol nickel nitrate and 220mmol zinc nitrate in 2L N,N-dimethylformamide solvent, then add a certain amount of 270mmol 2-methylimidazole, stir at room temperature for a period of time, transfer to a 100mL reaction kettle, High temperature reaction at 120°C for 36 hours, cooling, suction filtration, and drying to obtain ZIF-8 / ZIF-67 hybrid base material;

[0038] 2) Inject 800mL of 1mol / L sodium borohydride aqueous solution into the ZIF-8 / ZIF-67 hybrid material obtained in step 1), stir, and reduce the nickel ions contained therein to obtain suspension B, and let it stand for a while;

[0039] 3) the suspension B after standing in step 2), suction filtration, washing, and vacuum drying to obtain the NiB-Zn / ZIF-8 catalyst, the quality of NiB in the NiB-Zn / ZIF-8 catalyst is ZIF 12.1% of the mass of -8.

[0040] S2, hydrogenolysis reaction

[0041] The catalyst prepared by 40.0ml step S1 is loaded into a fixed-bed re...

Embodiment 3

[0043] S1, the preparation of catalyst

[0044] 1) Dissolve 130mmol nickel nitrate and 260mmol zinc nitrate in 2L N,N-dimethylformamide solvent, then add a certain amount of 390mmol 2-methylimidazole, stir at room temperature for a period of time, transfer to a 100mL reaction kettle, High temperature reaction at 120°C for 36 hours, cooling, suction filtration, and drying to obtain ZIF-8 / ZIF-67 hybrid base material;

[0045] 2) Inject 800mL of 1mol / L sodium borohydride aqueous solution into the ZIF-8 / ZIF-67 hybrid material obtained in step 1), stir, and reduce the nickel ions contained therein to obtain suspension B, and let it stand for a while;

[0046] 3) the suspension B after standing in step 2), suction filtration, washing, and vacuum drying to obtain the NiB-Zn / ZIF-8 catalyst, the quality of NiB in the NiB-Zn / ZIF-8 catalyst is ZIF -38% of the quality of the 8.

[0047] S2, hydrogenolysis reaction

[0048] The catalyst prepared by 40.0ml step S1 is loaded into a fixed-...

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PUM

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Abstract

The invention discloses a method for preparing isopropylbenzene through catalytic hydrogenolysis of alpha,alpha-dimethyl-benzyl carbinol. According to the method, an NiB-Zn / ZIF-8 catalyst is adopted,alpha,alpha-dimethyl-benzyl carbinol and hydrogen are taken as the raw materials, the molar ratio of raw material gas / nitrogen is 1 to 15, the molar ratio of hydrogen / alpha,alpha-dimethyl-benzyl carbinol is 5 to 1, and under the condition that the reaction temperature is 120 DEG C, the reaction pressure is 0.5MPa and the volume velocity of inert carrier gas is 3.0h<-1>, the conversion rate of alpha,alpha-dimethyl-benzyl carbinol is 100%, and the selectivity of isopropylbenzene is over 96.8%, so that a relatively technical effect is achieved, the product is easy to separate, the after-treatmentis simple, and the catalyst can be recycled for repeated use.

Description

technical field [0001] The invention relates to a method for preparing cumene, in particular to a method for preparing cumene by catalytic hydrogenolysis of α,α-dimethylbenzyl alcohol. Background technique [0002] Cumene (Isopropylbenzene, Nimene, CAS: 98-82-8), a colorless liquid with a special aromatic odor, is used as a raw material for organic synthesis and as an additive to increase the octane number of engine fuel. [0003] Industrially, it is derived from the alkylation reaction of benzene and propylene. Usually, aluminum trichloride is used as catalyst and hydrogen chloride is used as accelerator, and the reaction is carried out at normal pressure and around 95°C. In addition to generating cumene, there are also polyalkyl by-products such as diisopropylbenzene and triisopropylbenzene. Excessive benzene can be used to reduce side reactions, the molar ratio of benzene to propylene is about 3; the content of aluminum trichloride in the reaction solution is 3%-8%; the...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C1/24C07C15/085B01J31/22B01J31/28
CPCB01J31/1815B01J31/28C07C1/20C07C1/24C07C15/085Y02P20/52Y02P20/584
Inventor 崔九香朱友富
Owner 崔九香
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