Method and apparatus for quantitatively analyzing gaseous process stream

A material flow, gaseous technology, applied in the field of quantitative analysis of gaseous process material flow

Pending Publication Date: 2019-05-21
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, accurate gas calibration standards are only commercially available, down to a concentration range of 1000 to 2 ppmv

Method used

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  • Method and apparatus for quantitatively analyzing gaseous process stream
  • Method and apparatus for quantitatively analyzing gaseous process stream
  • Method and apparatus for quantitatively analyzing gaseous process stream

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Experimental program
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Embodiment

[0174] Table 1 shows the sequence of operating steps to be performed on the gas blending system in order to start with known concentrations of methyl iodide (MI), ethyl iodide (EI), vinyl iodide (VI), methyl chloride (MC), Halide Standard Gases for Ethyl Chloride (EC) and Vinyl Chloride (VC), using nitrogen as the diluent gas to prepare diluted calibration standards with the desired nominal concentration (with 50 ppbv ethyl iodide as the target concentration).

[0175] Table 1. Sequence of operations for preparing calibration gas samples

[0176]

[0177]

[0178]

[0179] The sequence of operations given in Table 1 was used to generate a series of calibration gases used to provide full range calibration of the GC equipment. Table 2 sets the nominal flow rates of the halide standards and diluent gases required to produce the calibration gas composition. Table 2 also provides the capillary inlet and outlet pressures that will produce the desired halide standard flow. ...

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Abstract

The present invention relates to method and an apparatus for quantitatively analyzing a gaseous process stream, in particular a stream from a process for producing ethylene carbonate and / or ethylene glycol, in particular where such stream comprises gaseous organic iodides.

Description

technical field [0001] The present invention relates to methods and related systems for the quantitative analysis of gaseous process streams, especially streams from processes for the production of ethylene carbonate and / or ethylene glycol, especially where such streams contain parts per billion and and / or in the case of organic iodides in the parts per trillion range. Background technique [0002] Ethylene glycol (EG) is a valuable industrial compound widely used as a raw material for the manufacture of polyester fibers and polyethylene terephthalate (PET) resins; it is also used in automotive antifreeze and hydraulic brake fluids , aircraft deicers and pharmaceutical products. [0003] Ethylene glycol is typically produced from ethylene oxide (EO). Ethylene oxide is in turn prepared by silver-catalyzed oxidation of ethylene. More specifically, ethylene and oxygen are passed over a silver oxide catalyst, typically at a pressure of 10-30 bar and a temperature of 200-300°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N33/00
CPCG01N30/88G01N2030/8886G01N30/68G01N30/70G01N2030/8845G01N2030/025B01J4/008B01J8/0457B01J2208/00964B01J2219/00247C07C31/202C07D317/38G01N30/06G01N30/24G01N33/0006
Inventor J·R·布莱克J·M·弗里林R·K·奥德菲尔德G·J·瓦德
Owner SHELL INT RES MAATSCHAPPIJ BV
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