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Deoxidation catalyst for olefin gas, preparation method and application thereof

A deoxidation catalyst and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of frequent regeneration, high use temperature, and high price. Achieve the effects of low operating temperature, good stability and long service life

Active Publication Date: 2015-07-22
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the above technical problems, the present invention provides a catalyst with noble metal as the main active component and transition metal element as the auxiliary active component, which overcomes the high use temperature and high price of the single noble metal as the active component and the simple transition metal as the active group. A kind of olefin gas deoxygenation catalyst with disadvantages such as needing frequent regeneration and its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of vector

[0043] Dry mixing method: Weigh 146g of pseudo-boehmite and 5g of nano-titanium dioxide, roast at 800°C for 2 hours, mix evenly, and use the rolling ball forming process to make a ball with a diameter of 2 to 4mm to obtain TiO 2 5% TiO 2 / Al 2 o 3 Composite carrier, denoted as TA-01.

[0044] Sol-gel method: Take 85ml of tetra-n-butyl titanate and slowly add it dropwise to absolute ethanol, and add it while stirring.

[0045] Add the inhibitor glacial acetic acid, stir vigorously to form a colloidal solution, add deionized water to the solution, and slowly add 80gAl 2 o 3 , forming a gel. Then the gel was dried at constant temperature at 80°C for 10h, and the dried crystal was calcined at 300°C for 10h to obtain TiO 2 20% TiO 2 / Al 2 o 3 Composite carrier, denoted as TA-02.

[0046] Co-precipitation method: take 50.3g of titanium sulfate or 23.7g of titanium tetrachloride, and 376g of aluminum nitrate, dissolve them in deionized water,...

Embodiment 2

[0048] Weigh 0.017g of palladium chloride and 57.5g of manganese nitrate tetrahydrate and dissolve in water to make a solution, weigh 80g of carrier TA-01, immerse in the above prepared solution, immerse at room temperature for 6h, dry at 80°C for 5h, and 300°C After roasting for 5 hours, a deoxidation catalyst with a Pd content of 0.01% (based on the weight of the carrier, the same below) and a Mn content of 20% (based on the weight of the oxide, the same below) was obtained. Randomly extract 20ml of the catalyst and put it into the reactor. Feed ethylene feed gas, the gas space velocity is 2000h-1, the reaction temperature is 200°C, the pressure is 5.0MPa, and the inlet oxygen content is about 2000ppm. The outlet oxygen content is lower than 0.05ppm.

Embodiment 3～6

[0050] Weigh 21.3g of chloroplatinic acid and dissolve it in water, divide it into 4 parts, weigh 34.7g of ferrous sulfate, 38.8g of cobalt nitrate, 30.4g of copper nitrate and 16.8g of zinc chloride, dissolve them in water, and mix them with Pt solution Impregnation solution: Weigh 88g carrier TA-02 and immerse in each of the above impregnation solutions, immerse at room temperature for 5h, dry at 150°C for 5h, and roast at 600°C for 2h to obtain the active component with a Pt content of 2.0%. The content of Fe, Co, Cu and Zn are all 10% deoxidation catalyst. Randomly extract 20ml of each catalyst and put it into the reactor, feed ethylene feed gas, the gas space velocity is 20000h-1, the reaction temperature is 60°C, the pressure is 0.1MPa, and the inlet oxygen content is about 9900ppm. The outlet oxygen content is lower than 0.05ppm. The results are shown in Table 1.

[0051] Table 1 The deoxidation performance of the catalysts of Examples 3-6

[0052]

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Abstract

The invention provides a deoxidation catalyst for olefin gas, a preparation method and an application thereof. The deoxidation catalyst for the olefin gas comprises, by oxide, 0.01-5 % by weight percent of active components selected from one or more of Pd, Pt and / or Ag, 1-20 % by weight percent of an active additive selected from any one of Mn, Fe, Co, Cu and Zn compounds, and the balance being a carrier, wherein the carrier is a nano TiO2 / Al2O3 composite carrier, and is prepared by a dry-mixing method, a sol-gel method or a co-precipitation method. The deoxidation catalyst is relatively high in mechanical strength, not easy to be pulverized, high in low-temperature activity, and long in service life, can be directly used for deoxidation and purification of industrial polyolefin, is free of reduction and activation, and can prevent olefin addition during a using process and can deoxidize oxygen not higher than 10000 ppm in the olefin to be less than 0.05 ppm.

Description

technical field [0001] The invention relates to the field of industrial olefin processing, in particular to an olefin gas deoxygenation catalyst and its preparation method and application. Background technique [0002] Ethylene and propylene are the basic raw materials of the petrochemical industry and also bulk chemicals with high added value. The deoxygenation and purification treatment of ethylene and propylene is very important for the downstream polyolefin production. [0003] In the industrial production of polyolefins, the existence of trace oxygen impurities will destroy the active center of high-efficiency polyolefin catalysts or participate in polymerization reactions, reduce the orientation ability of catalysts or form random active chains, which will not only reduce the activity, selectivity and yield of high-efficiency catalysts rate, but also affect the density, viscosity, molecular weight, cross-linking degree, isotacticity and performance of the polymer, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/656B01J23/89B01J23/60C07C11/04C07C7/148
CPCY02P20/52
Inventor 郑珩李洁陈耀壮曾健廖炯姚松柏雷菊梅
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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