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Method for rapidly measuring concentration of polypropylene electron donor (CMMS)

An electron donor, rapid determination technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of easy-to-interfere CHMMS peak identification, wrong results, high price, etc., and achieve high speed, high accuracy and simple steps. Effect

Inactive Publication Date: 2017-10-17
内蒙古中煤蒙大新能源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In process production, it is necessary to use the concentration of CMMS to determine the amount of addition during production. The existing method for measuring the concentration of CMMS uses capillary chromatographic columns, and capillary columns are not only more expensive than packed columns, but also because the multi-component chromatographic peaks are closer, it is easy to Interfering with the identification of CHMMS peaks can easily cause errors in results, which brings inconvenience to people's production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for rapidly measuring polypropylene electron donor (CMMS) concentration, the concrete steps are as follows:

[0023] Step 1, dry the cleaned 50ml volumetric flask and constant weight to 0.2mg, the quality is W 0 ;

[0024] Step 2, pipette 1g of pure CMMS into a 50ml volumetric flask with a syringe and shake it up, weigh it with a balance, and the quality is recorded as W 1 ;

[0025] Step 3, dilute the volumetric flask filled with pure CMMS to the mark with n-hexane and weigh it, and this quality is recorded as W 2 , then the solution in the volumetric flask is the concentration of the CMMS standard sample is C S =(W 1 -W 0 ) / (W 2- W 0 )×100%;

[0026] Step 4, the chromatographic condition is to adopt a chromatographic column of 4m × Φ4mm, adopt 25% SE-30 as the stationary phase, use silanized white diatomite with a particle size of 60 mesh as the monomer, and use a flow rate of 30ml / min for the chromatographic carrier gas. Nitrogen with a purity of 99...

Embodiment 2

[0033] A method for rapidly measuring polypropylene electron donor (CMMS) concentration, the concrete steps are as follows:

[0034] Step 1, dry the cleaned 50ml volumetric flask and constant weight to 0.2mg, the quality is W 0 ;

[0035] Step 2, pipette 1g of pure CMMS into a 50ml volumetric flask with a syringe and shake it well, weigh it with a ten-thousandth balance, and record the mass as W 1 ;

[0036] Step 3, dilute the volumetric flask filled with pure CMMS to the mark with analytical grade n-hexane and weigh it, and the quality is recorded as W 2 , then the solution in the volumetric flask is the concentration of the CMMS standard sample is C S =(W 1 -W 0 ) / (W 2- W 0 )×100%;

[0037]Step 4, the chromatographic condition is to adopt a stainless steel chromatographic column of 4m×Φ4mm, adopt 25% SE-30 as the stationary phase, use silanized white diatomite with a particle size of 80 mesh as the monomer, and use a flow rate of 30ml / min for the chromatographic carr...

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Abstract

The invention discloses a method for quickly measuring the concentration of a polypropylene electron donor (CMMS). The method has simple steps. The CMMS solution to be tested or the CMMS solution diluted with a solvent is injected into a gas chromatograph equipped with a hydrogen flame ionization detector. In the process, under the carrying action of mobile phase nitrogen, each component in the sample undergoes adsorption and desorption with the stationary phase in the special packed chromatographic column, and finally separates the CMMS component, and then passes through a hydrogen flame The ion detector ionizes the CMMS components into electrical signals, and based on the detected signal value, the CMMS content is calculated quantitatively, with fast speed, less interference, high accuracy and good use effect.

Description

technical field [0001] The invention relates to the field of polypropylene production, in particular to a method for quickly measuring the concentration of a polypropylene electron donor (CMMS). Background technique [0002] Polypropylene is a kind of thermoplastic resin made by polymerizing propylene. Polypropylene is a non-toxic, odorless, tasteless milky white high-crystallization polymer with a density of only 0.90-0.91g / cm3, which is currently the lightest of all plastics. One of the most famous varieties, it is particularly stable to water, the water absorption rate in water is only 0.01%, the molecular weight is about 80,000-150,000, and the formability is good. According to the arrangement position of the methyl group, it is divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. The methyl group is arranged on the same side of the molecular main chain, which is called isotactic polypropylene. The two sides of the cha...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 樊玉卿
Owner 内蒙古中煤蒙大新能源化工有限公司