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External activating method of cis-butenedioic anhydride catalyst

A technology of catalyst and maleic anhydride, which is applied in the field of activation process of vanadium molybdenum catalyst, can solve the problem that the catalyst activity cannot be well utilized, and achieve the effects of improving benzene conversion rate and maleic anhydride yield, reducing equipment, and saving energy

Inactive Publication Date: 2006-08-30
TIANJIN BOHUA ZHONGHE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the main manufacturers of maleic anhydride catalysts in China are Zhonghe Chemical Plant and Beijing Research Institute of Chemical Industry. They still use the method of in-vehicle activation, so that maleic anhydride manufacturers have to invest a lot of manpower, material and financial resources in catalyst activation. less than good use

Method used

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  • External activating method of cis-butenedioic anhydride catalyst
  • External activating method of cis-butenedioic anhydride catalyst
  • External activating method of cis-butenedioic anhydride catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A. Vector Preparation

[0032] Weigh 800g of green silicon carbide powder passing through a 70 mesh sieve, 200g of low-pressure china clay passing through a 100 mesh sieve, 66.4g of methylcellulose with a molecular weight of 20-40, and 133.6g of polypropylene powder passing through a 40-80 mesh sieve, Put it into the barrel in turn and mix evenly. In addition, weigh 200mL90-4 containing Si0 224% silica sol, dissolved in 200ml distilled water. Then put the two together and mix well, fully knead, and place for 24h. The carrier in the shape of a cylindrical ring is then formed on a carrier forming machine. After drying the formed carrier, place it in a high-temperature electric furnace, burn it at 1325±15°C for 8 hours, and cool it naturally to obtain the finished silicon carbide cylindrical ring carrier. The size of the carrier is: outer diameter 6.5mm, inner diameter 3.5mm, height 4.0mm. The main physical performance indicators of the carrier: bulk density 0.67±0.02...

Embodiment 2

[0042] A. Vector Preparation

[0043] Prepare carrier by example-1 method A industrial scale, the packing density of green silicon carbide ring is 0.61-0.63g / ml, specific surface (BET method) 0.1-0.2m 2 / g, point pressure transversely ≥2.5kg / grain, carrier size is 6.7mm in outer diameter, 3.8mm in inner diameter, and 4.5mm in height.

[0044] B, preparation of active substance solution

[0045] According to example-1 method B preparation, in 380ml water, contain oxalic acid 95.2g, ammonium metavanadate 76.16g, ammonium molybdate 34.52g, nickel nitrate 1.421g, trisodium phosphate 4.954g, dineodymium trioxide 0.0548g and dysprosium 0.0529g .

[0046] C. Catalyst Preparation

[0047] Prepare catalyzer by example-1 method C, the quantity that drops into carrier changes 300g into,

[0048] D, catalyst activation

[0049] Activate 300ml of the catalyst according to the method D of the above example-1, take about 300ml of the catalyst prepared by the above method C, put it into ...

Embodiment 3

[0053] A. Vector Preparation

[0054] According to the carrier formula of Example-1, select the green silicon carbide carrier specially invited by the industrial carrier manufacturer, with the size of outer diameter 7.0mm, inner diameter 3.5mm, height 4.2mm; bulk density 0.67±0.02g / ml; specific surface 0.1- 0.15m 2 / g, Na in carrier 2 O≤0.3%; the point pressure only needs to be ≥3kg / grain in the transverse direction.

[0055] B, preparation of active substance solution

[0056] The active substance solution was prepared according to Example-1, containing 5.3kg of oxalic acid, 1.9kg of ammonium molybdate, and 4.2kg of ammonium metavanadate in 20.4L of water. In addition, 0.273kg of trisodium phosphate, 0.79kg of nickel nitrate, and three 3.08 g of neodymium oxide and 2.9 g of dysprosium.

[0057] C. Catalyst Preparation

[0058] 17.3 kg of carrier was placed in a continuously heated spray pan which was continuously rotatable. Prepare 20kg of catalyst by the spraying metho...

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Abstract

The invention provides activator activation technology out of implement, provides several kinds of vanadium and molybdenum activator technic method of oxidation of benzene to produce arranged anhydride. Its activation method is setting the activator in a subminiature solid phase reactor, then put the reactor into the activator even, and complete the process after high temperature calcinations. Compared to the benzene activator process in the benzene oxidation reactor, the process can be called new activator technic out of vessel. The main technic condition is activator temperature, 400-500 deg.C; activator time, 2-10h; the activator atmosphere is the air with ammonia, the proportion of ammonia and air is 1:25-1:5. The method of this invention, can save a lot of energy of consumer, reduce equipment, decrease the technical demand of the reactor; at the same time, it can increase the coat fastness of the activator, increase the conversion of benzene and arranged anhydride acceptance rate; it can mitigate the poison to operators greatly, because of no vanadium powder.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an activation process method of various vanadium-molybdenum catalysts for preparing maleic anhydride by benzene oxidation in a fixed bed. Background technique [0002] At present, the fixed-bed benzene oxidation maleic anhydride catalyst produced and sold at home and abroad must have an activation process before use. Some of this activation process is completed by the catalyst user (ie maleic anhydride producer) in the reactor, which is in-vehicle activation; while the activation process that has been completed by the catalyst producer before the catalyst leaves the factory belongs to out-of-vehicle activation. [0003] Early Japanese Patent No. 2353136 proposed to use hydrogen, carbon monoxide, methane, hydrogen sulfide and other gases to process at 500°C. This requires maleic anhydride producers to set up devices for generating hydrogen and ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/08
Inventor 姚少华李宏勤毛磊武学军周洪文
Owner TIANJIN BOHUA ZHONGHE CHEM