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Method and instrument for quantitatively analyzing trace amount acetylene hydrocarbon in carbon four fractions

A technique for quantitative analysis and fractionation, which is applied to instruments, scientific instruments, analytical materials, etc. It can solve the problems of difficulty in distinguishing and accurate qualitative analysis, and achieve the effects of convenient operation, elimination of interference, and good repeatability.

Active Publication Date: 2009-01-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using a PLOT / Al 2 o 3 During column separation, such as image 3 As shown, the target components VA and EA have similar peaking times to carbopentaolefins, so it is difficult to identify them accurately, especially when the retention time drifts slightly, it is even more difficult to distinguish

Method used

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  • Method and instrument for quantitatively analyzing trace amount acetylene hydrocarbon in carbon four fractions
  • Method and instrument for quantitatively analyzing trace amount acetylene hydrocarbon in carbon four fractions
  • Method and instrument for quantitatively analyzing trace amount acetylene hydrocarbon in carbon four fractions

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Embodiment Construction

[0025] Refer below figure 1 and 2 The analytical instrument of the present invention is explained in more detail.

[0026] The instrument of the present invention for quantitatively analyzing trace alkynes in cracked C4 cuts comprises a split / splitless inlet 5, a nonpolar chromatographic column 2, a polar chromatographic column 3, a damping column 1, two hydrogen flame detectors 4, 6. Damping tube 7 and electronic steering valve 8; the air resistance of the damping column 1 is equal to the air resistance of the polar chromatographic column 3; the non-polar chromatographic column 2, the polar chromatographic column 3 and the damping column 1 are placed In the column box of the instrument; the split / splitless inlet 5 is connected to the carrier gas source; one end of the non-polar chromatographic column 2 is connected to the split / splitless inlet 5, and the other end is connected to a tee; one end of the damping column 1 is connected to the The hydrogen flame detector 4 is co...

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Abstract

The invention discloses a method and an instrument that are used for quantitatively analyzing micro acetylene hydrocarbon in a C4 distillate, belongs to the technical field of instruments and methods that quantitatively analyze micro impurities with the gas phase chromatography method, aims at solving the accurately quantitative schizolysis difficulty of the micro acetylene hydrocarbon in C4 that is unsolved for a long time, applies a two-dimensional gas phase chromatography system, discloses the analyzing instrument that consists essentially of a microfluidic circuit switching system with gas phase chromatography configuration, a dihydro-flame ionizing detector and a double-capillary column, uses the analyzing instrument for firstly separating C4 and lighter components from C5 and heavier components, and then leads the C4 and lighter components to enter a polar chromatography column, thus separating the C4 acetylene hydrocarbon from other components; an external reference method is adopted for quantitatively analyzing the acetylene hydrocarbon. The analyzing method of the invention is not interfered by C5 distillates and distillates having carbon number greater than C5, can accurately measure the micro C4 acetylene hydrocarbon in the ppm level, and has convenient operation, quickness, accuracy and good repeatability.

Description

technical field [0001] The invention relates to an instrument and method for quantitatively analyzing trace impurities by gas chromatography, in particular, the present invention relates to an instrument and method for quantitatively analyzing trace alkynes by gas chromatography. Background technique [0002] 1,3-butadiene is an important petrochemical raw material, derived from the mixed carbon four fractions produced by the cracking of petroleum hydrocarbons to produce ethylene, and is mainly used as a monomer for synthetic rubber. When 1,3-butadiene is used as a raw material for polymerization, there are strict requirements on its impurity content, especially alkynes are likely to cause polymerization catalyst poisoning, so while purifying 1,3-butadiene, the alkynes must be removed Except clean, the content of total alkynes requires less than 25ppm. [0003] When analyzing carbon tetraacetylenes in the removal of carbon tetraacetylenes by selective hydrogenation, it was ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/46G01N30/24
Inventor 石瑞红石锦文徐立英
Owner CHINA PETROLEUM & CHEM CORP
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