Catalyst for synthesizing 2,5-dimethylpyrazine by using isopropanolamine as raw materials and preparation method of catalyst

A technology of dimethylpyrazine and isopropanolamine, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems that do not involve catalyst preparation methods, etc. problem, to achieve the effect of improving anti-coking ability, high conversion rate, and easy industrial scale production

Active Publication Date: 2014-07-30
XIAN ORIGIN CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patents CN03143258.X and CN03143258.1 respectively introduced the method of producing 2,5-dimethylpyrazine and the separation and purification method of 2,5-dimethylpyrazine from isopropanolamine, but did not involve Catalyst preparation method

Method used

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  • Catalyst for synthesizing 2,5-dimethylpyrazine by using isopropanolamine as raw materials and preparation method of catalyst
  • Catalyst for synthesizing 2,5-dimethylpyrazine by using isopropanolamine as raw materials and preparation method of catalyst

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Embodiment 1

[0033] The catalyst of this embodiment comprises a carrier and an active component loaded on the carrier, the active component being copper oxide, zinc oxide and chromium oxide; the loading of the copper oxide is 9.71% of the mass of the catalyst, and the zinc oxide The load is 11.56% of the mass of the catalyst, and the load of chromium oxide is 3.36% of the mass of the catalyst; the carrier is a silica-alumina carrier with a mass percentage of silicon oxide of 10%, and the specific surface area of ​​the silica-alumina carrier is 200m 2 g -1 , the pore volume of the carrier is 0.45mL·g -1 .

[0034] The preparation method of this embodiment is:

[0035] Step 1, 30.1g Cu(NO 3 ) 2 ·3H 2 O, 43.11g Zn(NO 3 ) 2 ·6H 2 O and 18.05gCr(NO 3 ) 3 9H 2O was dissolved in deionized water to prepare an impregnating solution, and then 75.4 g of spherical silica-alumina carriers with a diameter of 1 mm to 3 mm were placed in the impregnating solution for 2 hours by equal-volume imp...

Embodiment 2

[0038] The catalyst of this embodiment comprises a carrier and an active component loaded on the carrier, the active component being copper oxide, zinc oxide and silver oxide; the loading of the copper oxide is 10.71% of the mass of the catalyst, and the zinc oxide The load is 9.35% of the mass of the catalyst, and the load of silver oxide is 5.67% of the mass of the catalyst; the carrier is a silica-alumina carrier with a mass percentage of silicon oxide of 15%, and the specific surface area of ​​the silica-alumina carrier is 225m 2 g -1 , the pore volume of the carrier is 0.47mL·g -1 .

[0039] The preparation method of this embodiment is:

[0040] Step 1, 53.64g Cu(NO 3 ) 2 ·3H 2 O, 56.35g Zn(NO 3 ) 2 ·6H 2 O and 13.70gAgNO 3 Dissolve it in deionized water to make an impregnation solution, and then place 120 g of spherical silica-alumina carriers with a diameter of 1 mm to 3 mm in the impregnation solution for 4 hours using the equal volume impregnation method;

...

Embodiment 3

[0043] The catalyst of the present embodiment comprises a carrier and an active component loaded on the carrier, and the active component is copper oxide, zinc oxide, chromium oxide and silver oxide; the loading of the copper oxide is 14% of the mass of the catalyst, The load of zinc oxide is 15% of the mass of the catalyst, the load of chromium oxide is 4% of the mass of the catalyst, and the load of silver oxide is 3% of the mass of the catalyst; the carrier is 20% by mass of silicon oxide Si-alumina carrier, the specific surface area of ​​the silica-alumina carrier is 245m 2 g -1 , the pore volume of the carrier is 0.51mL·g -1 .

[0044] The preparation method of this embodiment is:

[0045] Step 1, 14g of copper oxide, 15g of zinc oxide, 4g of chromium oxide, 3g of silver oxide and 64g of silicon-aluminum carrier were mechanically rolled and mixed for 0.5h to obtain a mixed material;

[0046] Step 2: Add 1.5g of sodium carboxymethyl cellulose and 75mL of deionized wate...

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Abstract

The invention discloses a catalyst for synthesizing 2,5-dimethylpyrazine by using isopropanolamine as raw materials. The catalyst comprises a carrier and active ingredients which are supported on the carrier, wherein the active ingredients are copper oxide, zinc oxide and other metal oxides; the supporting capacity of the copper oxide is 5-15 percent of the mass of the catalyst; the supporting capacity of the zinc oxide is 5-15 percent of the mass of the catalyst; other metal oxides are silver oxide and / or chromium oxide, and the supporting capacities of other metal oxides are 4-8 percent of the mass of the catalyst; the carrier is an Al2O3 carrier or a silicon aluminum carrier; the mass percentage of silicon oxide in the silicon aluminum carrier is not more than 20 percent. The copper oxide, the zinc oxide and one or both of the silver oxide and the chromium oxide are used as the active ingredients, so that the activity and selectivity of the catalyst can be remarkably improved; the prepared catalyst has the characteristics that the reaction conditions are mild, the isopropanolamine conversion rate is high, and the 2,5-dimethylpyrazine selectivity is high.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a catalyst and a preparation method for synthesizing 2,5-dimethylpyrazine by using isopropanolamine as a raw material. Background technique [0002] 2,5-Dimethylpyrazine (2,5-dimethylpyrazine) is an important pharmaceutical and chemical raw material. It is the key intermediate of new drugs such as esters, and it is also the edible flavor specified in the national standard GB2760-1996. It is added to baked food, cocoa, coffee, meat, nuts and other foods to produce a pleasant fragrance. There are important uses in industry. At present, the typical synthetic technical routes of 2,5-dimethylpyrazine are as follows: 1) Treat the ketone containing active methylene with nitrous acid, then reduce it to two molecules of α-amino ketone and then dehydrate and cyclize it to obtain dihydropyrazine Dihydropyrazines are easily dehydrogenated into alkylpyrazines due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01J23/89B01J23/889B01J35/10C07D241/12
Inventor 李选志王亚利王雁曹晓玲
Owner XIAN ORIGIN CHEM TECH
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