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Determination method of carbon content of MTO catalyst

A measurement method and catalyst technology, which is applied in the direction of measuring devices, color/spectral characteristic measurement, and material analysis through optical means, can solve the problems of synthetic color errors, long analysis time, poor repeatability, etc., and achieve easy operation and step-by-step Simple, fast analysis of effects

Inactive Publication Date: 2019-11-29
内蒙古中煤蒙大新能源化工有限公司
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Problems solved by technology

The main disadvantage of the present method is that the repeatability is poor, and the relative error is ± 2.0%; the influence degree of the auxiliary agent (the amount of iron particles) of the oxidation reaction is not easy to control; the crucible and oxygen are consumed for a long time, and it is not easy to establish an online measurement method
Other enterprises use thermogravimetric analysis, the operation steps are cumbersome, the analysis time is long, and it cannot be used for online analysis; there is also the colorimetric value measurement method, using the colorimetric value = [R 2 +G 2 +B 2 〕 1 / 2 , using carbon powder and fresh catalyst to prepare the standard
The synthetic color used in this method has a large error caused by the difference between the standard sample and the catalyst particle shape in actual production.

Method used

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  • Determination method of carbon content of MTO catalyst
  • Determination method of carbon content of MTO catalyst
  • Determination method of carbon content of MTO catalyst

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Experimental program
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Effect test

Embodiment

[0054] 1.1. Use the existing carbon analyzer or thermogravimetric method to analyze the data (the relative error of the combustion analysis method is not more than ± 2.0%), and collect catalyst samples with moderate gradient differences in carbon content, including regenerated catalysts and unborn catalysts. (note, 10 parallel measurements, take the average value), special attention, in the specific implementation, the regenerated catalyst and the spent catalyst are carried out separately, not mixed together, here is just to illustrate, we have two kinds of products That's all.

[0055] 1.2. Through multiple measurements, a series of catalyst samples with known carbon content were obtained. See Table 1 and Table 2 for the sample information.

[0056] 1.3. Set colorimeter parameters: use D65 light source and 10°observation angle.

[0057] 1.4. Measure the L value of each catalyst sample on a colorimeter, see Table 1 and Table 2.

[0058] Table 1. The L value measured by the c...

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Abstract

The invention relates to the technical field of catalyst carbon deposit amount measurement, and particularly to a determination method of a carbon content of an MTO catalyst. According to the method,brightness L value directly related to black and white is determined, a formula of a relationship between the carbon content and the brightness L value is determined at the same time, and the brightness L value is substituted into the relationship formula to thereby obtain a numerical value of the carbon content of the catalyst; interference of other measurement values in calculation is avoided, asample is not damaged, and no chemical reaction process is required; and fast analysis is realized, and a path and a mathematical model are provided for online analysis.

Description

technical field [0001] The invention relates to the technical field of catalyst carbon deposition measurement, in particular to a method for measuring the carbon content of an MTO catalyst. Background technique [0002] Methanol-to-olefins (MTO) catalysts will generate carbon deposits in the reactor, and the amount of carbon deposits is called carbon content. The amount of carbon content directly affects the catalytic performance of the catalyst, which in turn affects the conversion rate of dienes (ethylene, propylene) in the reactor. Therefore, the MTO process needs to control the amount of carbon deposits in the production process, and after accumulating more deposits The catalyst is regenerated to eliminate excessive carbon deposits. During this process, fast and accurate analysis is required to monitor the carbon content of the catalyst before regeneration (called standby) and after regeneration (called regeneration). [0003] China Coal Mengda New Energy Chemical Co.,...

Claims

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Application Information

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IPC IPC(8): G01N21/25
CPCG01N21/251
Inventor 樊玉卿王六张迎辉赵霞王春香
Owner 内蒙古中煤蒙大新能源化工有限公司
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