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Apparatus and process for production of catalyst, and process for production of unsaturated acid or unsaturated nitrile

A technology for a manufacturing device and a manufacturing method, applied in the field of manufacturing unsaturated acid or unsaturated nitrile, can solve the problems of low solution stability, precipitation, inability to send aqueous mixed solution, and catalyst performance reduction.

Inactive Publication Date: 2013-08-21
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixed solution formed by niobium and various other metal ions has extremely low stability as a solution and is prone to precipitation because each metal ion has a different pH stable region
Especially when the aqueous mixed liquid contains Mo-V-Nb-(Te / Sb), it has the characteristic of being very easy to gel in the state without stirring, and the inhomogeneity of the composition occurs in the local area where the stirring is insufficient, so that there is a cause Possibility of reduced catalyst performance
In addition, there may even be cases where the prepared aqueous mixture cannot be sent to the spray dryer

Method used

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  • Apparatus and process for production of catalyst, and process for production of unsaturated acid or unsaturated nitrile
  • Apparatus and process for production of catalyst, and process for production of unsaturated acid or unsaturated nitrile
  • Apparatus and process for production of catalyst, and process for production of unsaturated acid or unsaturated nitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0230] (manufacture of niobium raw material solution)

[0231] A niobium raw material solution was produced by the following method. First, mix 80.2% by mass Nb in 500kg of water 2 o 5 76.33kg of niobic acid and oxalic acid dihydrate [H 2 C 2 o 4 2H 2 O] 290.2 kg. The added oxalic acid / niobium molar ratio was 5.0, and the added niobium concentration was 0.532 (mol-Nb / kg-liquid). By heating and stirring this liquid at 95°C for 1 hour, an aqueous solution in which the Nb compound was dissolved was obtained. After the aqueous solution was left to stand and ice-cooled, the solid was filtered by suction filtration to obtain a uniform aqueous solution of the Nb compound. The same operation was repeated several times, and the obtained aqueous solutions of Nb compounds were combined to obtain a niobium raw material solution. According to the following analysis, the molar ratio of oxalic acid / niobium in this niobium raw material solution was 2.4.

[0232] Accurately weigh 10 ...

Embodiment 2

[0256] (manufacture of niobium raw material solution)

[0257] It carried out similarly to Example 1.

[0258] (Preparation of aqueous mixture)

[0259] As a temperature adjustment device 150 (pipe type heating / cooling equipment) having both functions of heating and cooling, a figure 2 The heat exchanger of the same heat transfer tube 154 shown in the heat transfer tube, the material of the heat transfer tube 154 is stainless steel, and the surface of the outer side of the region 154a where the heating medium is high temperature is coated with fluorocarbon resin (trade name "Teflon PTFE ", manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.). As a material for the inner surface of the mixed liquid tank 110, a fluorocarbon resin (trade name "Teflon PTFE", manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.) was used. A fluorocarbon resin (trade name "Teflon PTFE", manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.) was used as the material of the portion of ...

Embodiment 3

[0279] (manufacture of niobium raw material solution)

[0280] It carried out similarly to Example 1.

[0281] (Preparation of aqueous mixture)

[0282] As a temperature adjustment device 150 (pipe type heating / cooling equipment) having both functions of heating and cooling, a figure 2 The shown heat transfer tube is the same as the heat transfer tube 154 of the heat exchanger, and the material of the heat transfer tube 154 uses a fluorocarbon resin (trade name "Teflon PFA", manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.), as a mixed As a material for the inner surface of the liquid tank 110, fluorocarbon resin (trade name "Teflon PTFE", manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd.) was used. Other than that, the production apparatus equipped with the catalyst of the same structure as Example 1 was used.

[0283] First, the dirt adhering to the mixed solution tank 110 is washed for 1 hour by the washing device 118 located in the upper part of the mixe...

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Abstract

The purpose of the present invention is to provide: an apparatus and a process for producing a catalyst, whereby it becomes possible to supply a prepared aqueous mixed solution to a drying machine smoothly; and a process for producing an unsaturated acid or an unsaturated nitrile, in which the catalyst is used. This apparatus for producing a catalyst comprises a vessel (110) which is so adapted that an aqueous mixed solution containing a Mo compound, a V compound and a Nb compound can be prepared therein, a drying machine (120) which is so adapted as to spray and dry the aqueous mixed solution, and a pipe (L10) which connects the vessel (110) to the drying machine (120) so that the aqueous mixed solution can be supplied from the vessel (110) to the drying machine (120), wherein a heating machine which is so adapted as to heat the aqueous mixed solution is provided in the vessel (110) and / or the pipe (L10) and a filtering device (140) which is so adapted as to filter the aqueous mixed solution is provided in the pipe (L10).

Description

technical field [0001] The present invention relates to a production apparatus and production method of a catalyst, and a production method of an unsaturated acid or an unsaturated nitrile. Background technique [0002] Conventionally, attention has been paid to methods of subjecting propane or isobutane to gas-phase catalytic oxidation or gas-phase catalytic ammoxidation to produce corresponding unsaturated carboxylic acids or unsaturated nitriles, and various oxide catalysts suitable for their production have been proposed. [0003] As a method for producing an oxide catalyst containing a Mo compound, a V compound, and a Nb compound, a method of preparing an aqueous liquid mixture, spray-drying it, and firing it to obtain an oxide catalyst is known. The mixed solution formed by niobium and various other metal ions has a different pH stability region for each metal ion, so the stability as a solution is extremely low and precipitation is easy to occur. Especially when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00B01J23/30B01J37/04B01J37/08C07C253/24C07C255/08B01J35/00
CPCB01J23/002B01J23/30B01J37/00B01J37/009B01J37/08C07C253/24B01J23/28B01J37/0018B01J37/0045B01J37/12B01J2523/00B01J35/40C07C255/08B01J2523/15B01J2523/41B01J2523/53B01J2523/55B01J2523/56B01J2523/68B01J2523/69B01J2523/3712Y02P20/52B01J35/70B01J2235/00B01J23/16B01J19/18B01J23/84B01J37/04B01J35/30C07C253/26
Inventor 加藤高明远藤聪门胁实
Owner ASAHI KASEI KK
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