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    blast 2

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    • Tetraethylene for industrial use (2)

      Time of Update: 2021-11-24
      3. 1 Method summaryUse gas chromatography to separate the components in the sample under selected working conditions, detect with a thermal conductivity detector, and calculate the purity of tetrachloroethylene with the calibration area normalization method .
    • Synthetic phenol for industrial use (2)

      Time of Update: 2021-11-24
      4. 5 Determination of melting colorTake the molten sample in the preheated colorimetric tube to the 100mL mark, and perform the measurement according to the provisions of GB/T3143 .
    • Oxalic acid for industrial use (2)

      Time of Update: 2021-11-23
      5 mL of sodium carbonate solution, evaporate to dryness on a water bath, then heat on an electric furnace to decompose oxalic acid, and then burn in a high-temperature furnace at 850°C for 5 min.
    • Industrial Sebacic Acid (2)

      Time of Update: 2021-11-23
      4) after the sample is completely dissolved, add 2 drops of phenolphthalein indicator, use sodium hydroxide standard The titration solution (4.
    • Maleic Anhydride for Industrial Use (2)

      Time of Update: 2021-11-23
      2. 1 Method summaryTitrate the sample with a standard sodium hydroxide titration solution, use phenolphthalein as an indicator, and calculate the content in terms of maleic anhydride .
    • Formic acid for industrial use (2)

      Time of Update: 2021-11-23
      Calculate the mass fraction of formic acid according to the volume of the standard titration solution that the sample consumes sodium hydroxide .
    • Dichloromethane for industrial use (2)

      Time of Update: 2021-11-23
      The standard titration solutions, preparations and products used in the analysis shall be prepared in accordance with the provisions of GB/T601 and GB/T603 when other requirements are not specified .
    • Industrial n-Butyl Acetate (2)

      Time of Update: 2021-11-23
      Using capillary column gas chromatography as the arbitration method, take the arithmetic average of the two parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.
    • Glacial acetic acid for industrial use (2)

      Time of Update: 2021-11-23
      2. 4 Result calculationThe mass fraction w 1 of acetic acid , the value is expressed in %, calculated according to formula (1): Where:V—The value of the volume of sodium hydroxide standard titration solution (4.
    • Trichloromethane for industrial use (2)

      Time of Update: 2021-11-23
      >. Each batch of products should be accompanied by a quality certificate, which includes: product name, product grade, manufacturer name, factory address, batch number or production date and the standard number
    • Ethyl acetate for industrial use (2)

      Time of Update: 2021-11-23
      is not more than 25% of the arithmetic mean of the two determination values . >The industrial ethyl acetate prepared
    • The 2 million tons project has been suspended, and 8 demonstration projects have been completed

      Time of Update: 2021-11-22
      . Based on the expectations and judgments on the demand and price of crude oil, the economic risk of Yitai Group's simultaneous construction of three large-scale coal-to-liquid projects is relatively high.
    • The new cycle gas production of the country's largest gas storage surpasses 2 billion cubic meters

      Time of Update: 2021-11-22
      of gas in the new round of gas production cycle from late October 2020 to the present, which is more than the previous cycle. 500 million cubic meters. > >  It is learned from PetroChina
    • Carbon tetrachloride for industrial use (2)

      Time of Update: 2021-11-20
      4. 4 Determination of carbon tetrachloride contentCarry out according to the method specified in GB/T21541-2008 .
    • Industrial acetone (2)

      Time of Update: 2021-11-20
      2 Reagents and solutionsa) Distilled water: prepared according to GB/T6C3;b) Sodium hydroxide standard titration solution: c(NaOH)=0.
    • Industrial octanol (2-ethylhexanol) (1)

      Time of Update: 2021-11-20
      1 Subject content and scope of application>This standard specifies the technical requirements, test methods, inspection rules and signs, packaging
    • Industrial n-butanol (2)

      Time of Update: 2021-11-20
      After the baseline is stable, use a micro syringe to inject the sample, measure the peak area of ​​each component, and use the area normalization method or a data processor to calculate .
    • Industrial monofluorotrichloromethane (F11) (2)

      Time of Update: 2021-11-19
      3. 4 If one indicator of the inspection result does not meet this standard, samples should be taken from twice the volume of the packaging unit (steel cylinder) for re-inspection.
    • Industrial octanol (2-ethylhexanol) (2)

      Time of Update: 2021-11-19
      c. Filling method: plug the outlet end of the chromatographic column (the end connected to the detector) with a little glass wool, draw a vacuum from the outlet end, and load the stationary phase under gentle vibration .
    • Industrial octanol (2-ethylhexanol) (3)

      Time of Update: 2021-11-19
      After the baseline is stable, use a micro glass syringe to inject the sample, measure the peak area of ​​each component, and calculate it according to the area normalization method or the chromatographic data processor .

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