?u= Wed, 06 Nov 2024 02:30:51 +0000 en-US hourly 1 https://wordpress.org/?v=6.7.1 ?u=/wp-content/uploads/2024/11/cropped-icon-150x150.png ?u= 32 32 ?u=/product/publishers/jis/jis-k-19021980/ Wed, 06 Nov 2024 02:30:51 +0000 Dissolved Acetylene

Published By	Publication Date	Number of Pages
JIS	1980-02-01	8

]]> Dissolved Acetylene

Published By	Publication Date	Number of Pages
JIS	1980-02-01	8

]]> ?u=/product/publishers/iso/iso-89161988/ Wed, 06 Nov 2024 00:18:36 +0000 Ethylene for industrial use — Determination of traces of polar compounds — Preparation of condensate samples by low-temperature scrubbing technique

Published By	Publication Date	Number of Pages
ISO	1988-12	9

]]> Specifies a method of sampling by scrubbing at dry ice temperature (195 K). Permits the concentration of traces of all the less volatile polar compounds (water, alcohols, esters, acids, amines, etc.) in a small amount of liquid phase practically without any interference due to adsorption phenomena on the relatively small internal surfaces of the scrubbing absorber. This sampling technique permits the exact determination of all these polar compounds at contents greater than 0.01 mg/m^3, at normal temperature and pressure. Is also applicable to the determination of hydrocarbons with a higher boiling point (for example traces of oil in ethylene).

]]> ?u=/product/publishers/iso/iso-89171988/ Wed, 06 Nov 2024 00:18:36 +0000 Light olefins for industrial use — Determination of water — Guidelines for use of in-line analysers

Published By	Publication Date	Number of Pages
ISO	1988-12	10

]]> Gives methods for the determination of water using an analyzer with an in-line sensor in gaseous flows of the substance to be analyzed. Compiles the various principles of working of the most generally used commercial analyzer like electrolytic decomposition – light reflection on a cooled mirror (dew-point) – modification of vibration frequency of a quartz crystal covered with a hygroscopic layer – variation of the capacity of a capacitor formed by a hygroscopic dielectric polymer and two porous electrodes – infrared spectrometry – Micro-wave absorption measurement – variation of the capacity of a capacitor consisting of an aluminium oxide dielectric covered by an evaporated porous gold film.

]]> ?u=/product/publishers/iso/iso-89151987/ Wed, 06 Nov 2024 00:18:34 +0000 Light olefins for industrial use — Determination of traces of chlorine — Wickbold combustion method

Published By	Publication Date	Number of Pages
ISO	1987-12	6

]]> A gaseous or liquid test portion is aspirated into the oxygen-hydrogen flame of a burner where it is burned with considerable excess of oxygen. the liberated chlorine and hydrochloric acid are absorbed in hydrogen peroxide solution. The chloride ions are conductimetrically or potentiometrically titrated with a silver nitrate solution.

]]> ?u=/product/publishers/iso/iso-85631987/ Wed, 06 Nov 2024 00:13:39 +0000 Propylène et butadiène à usage industriel — Échantillonnage en phase liquide

Published By	Publication Date	Number of Pages
ISO	1987-06	8

]]> La présente Norme internationale décrit les modes opératoires et les précautions à prendre pour l'exécution des prélèvements d'échantillons représentatifs de propylène et de butadiène en phase liquide, en vue de leur analyse. Elle établit, en outre, dans l'annexe A, un schéma donnant des indications sur les moyens d'éliminer la partie d'échantillon non utilisée au cours de l'analyse et, dans l'annexe B, un schéma chronologique de remplissage d'une bouteille d'échantillonnage.

]]> ?u=/product/publishers/iso/iso-81761986/ Wed, 06 Nov 2024 00:07:49 +0000 Butadiene for industrial use — Determination of active tert-butyl-catechol (TBC) (4- (1,1- dimethylethyl)-1,2-benzenediol) — High performance liquid chromatographic method

Published By	Publication Date	Number of Pages
ISO	1986-07	6

]]> The active TBC in a test portion is extracted by mixing with a solution containing m-nitrophpenol (as the internal standard) and evaporating the butadiene. The TBC and m-nitrophenol are separated by high-performance liquid chromatography and detected by UV: The peak areas or peak heights are measured and the TBC content is determined by using a calibration graph. The polymerization inhibitor TBC can also be determined by a spectrometric method (ISO 6684) but that method is not able to differentiate between the active inhibitor and its oxidized, inactive form. The present method specifically measures the concentration of the active form of TBC. The method is applicable to butadiene having TBC contents in the range 0 to 250 mg/kg.

]]> ?u=/product/publishers/iso/iso-81741986/ Wed, 06 Nov 2024 00:07:48 +0000 Ethylene and propylene for industrial use — Determination of acetone, acetonitrile, propan-2-ol and methanol — Gas chromatographic method

Published By	Publication Date	Number of Pages
ISO	1986-06	8

]]> The method comprises the passage of a gaseous test portion through water to absorb acetone, acetonitrile, propan-2-ol and methanol, and subsequent gas chromatographic analysis of the aqueous solution, using a flame ionization detector, and comparison of the peaks obtained with those derived from an external standard. The method is applicable to products having acetone, propan-2-ol and methanol concentrations greater than 1 mg/kg, and acetonitrile concentrations greater than 10 mg/kg.

]]> ?u=/product/publishers/iso/iso-81751986/ Wed, 06 Nov 2024 00:07:48 +0000 Propylene for industrial use — Determination of oligomers — Gas chromatographic method

Published By	Publication Date	Number of Pages
ISO	1986-07	6

]]> A liquid sample obtained at low temperature is vaporized and then passed through a chromatographic column which permits the separation of the oligomers. The detection is performed by flame ionization an the peaks obtained are compared with those derived from an external standard. The method is applicable to propylene having propene dimers (hexenes) contents greater than 20mg/kg and propene trimers (nonenes) contents greater than 30 mg/kg.

]]> ?u=/product/publishers/iso/iso-81731986/ Wed, 06 Nov 2024 00:07:47 +0000 Light olefins for industrial use — Determination of molecular oxygen in gaseous phase — Electrochemical method with a membrane- covered cell

Published By	Publication Date	Number of Pages
ISO	1986-11	7

]]> After sampling and preparation of the laboratory sample the gaseous test portion is passed at a given rate through an electrochemical cell previously calibrated with air or with standard mixtures containing a known amount of oxygen, and the concentration of oxygen in the gaseous olefin is measured. The method is applicable to light olefins having an oxygen content greater than 1 milliliter per cubicmeter.

]]> ?u=/product/publishers/iso/iso-73821986/ Tue, 05 Nov 2024 23:55:46 +0000 Ethylene for industrial use — Sampling in the liquid and the gaseous phase

Published By	Publication Date	Number of Pages
ISO	1986-09	8

]]> Describes the procedure and the precautions to be taken in drawing representative samples of ethylene in the liquid phase stored at -100 °C and in the gaseous phase, for the purpose of their analysis excluding the determination of water content, other polar components and hydrocarbons heavier than C₅. In an annex a diagrammatic representation is given of a system for the removal of the portion of the sample not used in the analysis.

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