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Alpha, alpha-dimethyl benzyl alcohol hydrogenolysis catalyst and preparation method thereof

A technology of dimethyl benzyl alcohol and catalyst, which is applied in the field of catalysis, can solve problems such as insufficient stability, and achieve the effects of inhibiting the growth of crystal grains, increasing the degree of dispersion, and strengthening the interaction

Active Publication Date: 2021-07-02
WANHUA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Cu-Zn system has good hydrogenation activity, the activity of the Cu-Zn solid solution provided by the calcination temperature of 350 ° C will gradually transform with the increase of the reaction temperature, resulting in insufficient stability.

Method used

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  • Alpha, alpha-dimethyl benzyl alcohol hydrogenolysis catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Dissolve 10.15g of niobium pentachloride in 11.3g of isopropanol and add it to 120g of aluminum isopropoxide after completely dissolving. At room temperature, use a high-frequency plasma generator with a radio frequency of 15MHz. The discharge parameters are voltage 100V, positive current (100±10) mA, gate current (50±10) mA, and processing vacuum 2Pa. The hydrolysis time is 2h.

[0083] Continue to use the plasma reactor to treat the reaction system, completely decompose the isopropanol, and the COD in the waste water is less than 50ppm. Carrier a was obtained by filtering, drying and calcining at 800°C for 6h.

[0084] Add 0.68L of water into the precipitation kettle, mix 151g of copper nitrate and 20.59g of 50% manganese nitrate aqueous solution, and then add them into the reactor in parallel with 15wt% sodium carbonate solution to obtain precursor b. The precipitation process temperature is controlled at 75°C, the precipitation time is 1h, the precipitation pH is ...

Embodiment 2

[0089] Dissolve 16.24g of niobium pentachloride in 18.0g of isopropanol, add it into 160g of aluminum isopropoxide after complete dissolution, heat to 40°C, and use a high-frequency plasma generator with a radio frequency of 14MHz. The discharge parameters are voltage 100V, positive current (100±10) mA, gate current (50±10) mA, and processing vacuum 50Pa. The hydrolysis time is 1.5h.

[0090] Continue to use the plasma reactor to treat the reaction system, completely decompose the isopropanol, and the COD in the waste water is less than 50ppm. Carrier a was obtained by filtering, drying and calcining at 900°C for 6h.

[0091] Add 0.62L of water into the precipitation kettle, mix 136g of copper nitrate and 20.59g of 50% manganese nitrate aqueous solution, and then add them into the reactor in parallel with 15wt% sodium carbonate solution to obtain precursor b. The precipitation process temperature is controlled at 65°C, the precipitation time is 1.5h, the precipitation pH is ...

Embodiment 3

[0096] Dissolve 16.24g of niobium pentachloride in 18.0g of isopropanol, add it into 160g of aluminum isopropoxide after completely dissolving, heat to 40°C, and use a high-frequency plasma generator with a radio frequency of 14MHz. The discharge parameters are voltage 100V, positive current (100±10) mA, gate current (50±10) mA, and processing vacuum 50Pa. The hydrolysis time is 1.5h.

[0097] Continue to use the plasma reactor to treat the reaction system, completely decompose the isopropanol, and the COD in the waste water is less than 50ppm. Carrier a was obtained by filtering, drying and calcining at 900°C for 6h.

[0098] 0.58L of water was added into the precipitation tank, 136g of copper nitrate and 8.23g of 50% manganese nitrate aqueous solution were mixed evenly, and then added to the reactor in parallel with 15wt% sodium carbonate solution to obtain precursor b. The precipitation process temperature is controlled at 65°C, the precipitation time is 1.5h, the precipi...

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Abstract

The invention relates to a preparation method of a catalyst for preparing cumene through hydrogenolysis of alpha, alpha-dimethyl benzyl alcohol. A Nb-Al compound is prepared through double hydrolysis to generate an AlNbO4 structure, isopropanol is promoted to be dehydrated by a plasma generator to slowly release water, and the hydrolysis rate can be controlled. The Cu-series catalyst provided by the invention is prepared from the following components in percentage by weight: 30 to 60 percent of CuO, 2 to 10 percent of MnOx, 1 to 10 percent of alkali metal compound additive, 5 to 20 percent of NbOx and 30 to 60 percent of Al2O3. The catalyst prepared by the method can solve the problem of serious pollution of the existing Cu-Cr catalyst, and the hydrogenolysis activity of the catalyst can be further improved.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to an α,α-dimethylbenzyl alcohol hydrogenolysis catalyst and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material, and its yield is second only to polypropylene among propylene derivatives. Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which polyether polyols are important raw materials for the production of polyurethane foams, insulation materials, elastomers, adhesives and coatings, etc. Ionic surfactants are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. At the same time, propylene oxide is also an important basic chemical raw material. [0003] α,α-Dimethylbenzyl alcohol (α-Cumyl Alcohol, CA) is a white prismatic crystal with a rose aroma, insoluble in water, soluble in etha...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J23/889B01J37/34C07C1/20C07C15/085C02F1/30C02F101/34
CPCB01J23/8892B01J37/349B01J23/20C07C1/20C02F1/30C02F2101/34C07C15/085Y02P20/584
Inventor 詹吉山沙宇李作金燕宸于海波孙康初乃波黎源张昊
Owner WANHUA CHEM GRP
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