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Preparation method for preparing maleic anhydride catalyst through light alkane selective oxidation

A technology for selective oxidation of low-carbon alkanes, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., which can solve problems such as easy shedding of active components of catalysts, poor working environment for workers, and long induction period of catalytic economy , to achieve the effect of improving the working environment of workers, increasing the utilization rate of raw materials, and shortening the induction period

Inactive Publication Date: 2019-05-21
李磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liu Xianguo invented the patent "a catalyst for the production of maleic anhydride by benzene oxidation" (public announcement number: CN103816931A). The spraying temperature of the catalyst is 210°C, and the raw material utilization rate of the catalyst is about 66%. It can be seen from the above industrial catalyst patents The loss of catalyst raw materials prepared by high-temperature spraying method is serious, which increases environmental pollution, and the active components of the catalyst are easy to fall off, the induction period of catalytic economy is long, and the working environment of workers is relatively harsh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Catalyst preparation

[0009] Dissolve 144.0g oxalic acid in water, then add 99.20g ammonium sulfate under heating and stirring until the ammonium sulfate is completely dissolved, then add 60.00g ammonium molybdate, 3.80g ammonium dihydrogen phosphate, 1.76g nickel nitrate hexahydrate, 6.19g sodium nitrate , heated until completely dissolved. The obtained slurry is sprayed and granulated in a spray dryer, and the catalyst particles are collected by a cyclone separator. The inlet temperature of the dryer is 150±5°C, and the spray gun pressure is 0.2Mpa. The collected catalyst particles were activated in a fluidized bed activation furnace. The activation heating program was as follows: at a rate of 2 °C / min to 450 °C and kept at this temperature for 6 hours, and then naturally lowered to room temperature. Add the activated catalyst active material and 30g of titanium dioxide into 500ml of deionized water, and add 35 grams of white glue, and use a homogeneous pump to disp...

Embodiment 2

[0013] Dissolve 148.00g oxalic acid in water, then add 101.97g ammonium sulfate under heating and stirring until completely dissolved, then add 47.43g ammonium molybdate, 4.38g ammonium dihydrogen phosphate, 1.81g nickel nitrate hexahydrate, 6.36g sodium nitrate, heat until completely dissolved. The obtained slurry is sprayed and granulated in a spray dryer, and the catalyst particles are collected by a cyclone separator. The inlet temperature of the dryer is 120±10°C, and the spray gun pressure is 0.3Mpa; the collected catalyst particles are placed in a fluidized bed Activation was carried out in an activation furnace, and the activation heating program was as follows: at a rate of 2°C / min to 450°C and kept at this temperature for 6 hours, then naturally lowered to room temperature. Add the activated catalyst active material and 33.0g of titanium dioxide into 500ml of deionized water, and add 35g of white glue, emulsify with a homogeneous pump, the speed of the homogeneous pu...

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Abstract

The invention discloses a preparation method for preparing a maleic anhydride catalyst through light alkane selective oxidation. The catalyst is prepared by adopting salts or oxides containing V, Mo,Ti, P, Na and Ni as precursors to obtain a solution or suspension, drying, activating, homogenizing, emulsifying and spraying. The preparation method disclosed by the invention solves the problems oflong induction period, easiness in falling of active matters, low utilization rate of catalyst raw materials, poor working environment of workers and heavy environmental pollution of an existing catalyst.

Description

technical field [0001] The invention belongs to the preparation and application of hydrocarbon oxidation catalysts, in particular to a preparation method of a catalyst for the selective oxidation of low-carbon alkanes to prepare maleic anhydride. Background technique [0002] Maleic anhydride is an important organic chemical raw material and the third largest anhydride in consumption after acetic anhydride and phthalic anhydride. It is mainly used in diene synthesis, pharmaceuticals, pesticides, dye intermediates and the preparation of polyester resins, alkyd resins, horse To acid, etc., has a wide range of applications and a huge market demand. [0003] At present, domestic maleic anhydride manufacturers mainly use benzene as raw material to produce maleic anhydride, and maleic anhydride catalyst manufacturers use high-temperature spraying method to prepare catalysts. For example, Yao Shaohua and others invented the patent "catalyst for producing maleic anhydride by gas-ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199C07D307/60
Inventor 李磊
Owner 李磊
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