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In-situ analysis method of propylene ammoxidizing product

A technology of oxidation reaction and analysis method, which is used in the preparation of hydrocarbon ammoxidation, analysis of materials, material separation, etc., can solve the problems of inability to realize automatic operation of the device, long analysis time, high labor intensity, etc., and achieve easy automation and good technical effect. , the effect of reducing labor intensity

Inactive Publication Date: 2004-06-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the propylene ammoxidation reaction product in the prior art can only be measured by chromatographic analysis and chemical titration after being absorbed by the acid solution, the operation is cumbersome, the labor intensity is high, the analysis time is long, and the automatic operation of the device cannot be realized. To provide a new method for online analysis of propylene ammoxidation reaction products

Method used

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  • In-situ analysis method of propylene ammoxidizing product
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  • In-situ analysis method of propylene ammoxidizing product

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Embodiment 1

[0023] Refer to attached figure 1 , the gas chromatograph used is HP4890D, equipped with double valves, two detectors of TCD and FID, and two capillary inlets to provide two paths of carrier gas. The carrier gas is high purity He. Chromatographic column 11 is WAX 30m×0.32mm×0.25 micron, chromatographic column 13 is Pora-PLOT Amines 25m×0.32mm×10 micron, and chromatographic column 14 is FFAP 50m×0.32mm×0.50 micron. When installing the above process, the appropriate capillary column and valve connection method should be adopted to minimize the dead volume of the system.

[0024] The chromatographic conditions are as follows:

[0025] Column head pressure A (with four-way valve 12): 87KPa;

[0026] Column head pressure B (with six-way valve 9): 145KPa;

[0027] TCD: temperature, 250°C; auxiliary gas flow, 3.4ml; reference gas flow, 15.0ml;

[0028] FID: temperature, 250°C; auxiliary gas flow, 19.0ml; air flow, 350ml; hydrogen flow, 20.5ml;

[0029] Capillary split injector,...

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Abstract

The present invention is in-site analysis method of propylene ammoxidizing product and aims at providing automatic relatively simple and time-saving in-site analysis method of propylene ammoxidizing product. The technological scheme of the present invention adopts twice direct gas samplings, including the first to complete the separation and rationing ammonia component and the second to complete the rationing of acrylonitrile, hydrocyanic acid, acraldehyde, acetonitrile and acrylic acid components. The present invention may be used in the industrial production of acrylonitrile.

Description

technical field [0001] The invention relates to an online analysis method for a propylene ammoxidation reaction product. Background technique [0002] Acrylonitrile is an important basic organic chemical raw material and one of the important monomers of the three major synthetic materials. In 1960, Standard Oil Co. successfully developed the propylene ammoxidation method to produce acrylonitrile, that is, using propylene, ammonia and air as raw materials, and catalyzed by molybdenum-bismuth catalyst in a fluidized bed reactor to directly synthesize acrylonitrile . Because the propylene ammoxidation method has obvious technical and economic advantages, it has become the only acrylonitrile production method at present. [0003] The synthesis gas in the production process of acrylonitrile is the outlet gas of the propylene ammoxidation reactor, mainly containing O 2 , N 2 , CO, CO 2 、C 2 ＝ (ethylene), C 3 ＝ (propylene), C 3 0 (propane),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/26C07C255/08G01N30/02
Inventor 方敬东陈群陈翠英吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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