Solvent oil No. 6, soy extract solvent oil looks like a colorless transparent liquid, is a mixture of various lower alkanes. The product fraction is wider than industrial hexane and has similar properties to industrial hexane. It is miscible with most liquid fats other than castor oil and dissolves lower fatty acids.

Solvent No. 6 is mainly composed of n-hexane and heptane, and contains a small amount of harmful substances such as benzene and toluene. It is a solvent with certain toxicity in anesthesia respiratory center. Because the No. 6 extraction solvent contains benzene, aromatic hydrocarbons, sulfur and other substances harmful to the human body, it will cause certain damage to the human nervous system and organs, and the balance of lipids in the nerve cells will be disordered, resulting in various human disorders. The residual amount of solvent in the oil is too high, and long-term consumption can lead to mental paralysis and paralysis.

At present, the standard for the extraction of solvent No. 6 is GB16629-26. The standard specifies the distillation range, aromatic hydrocarbons, bromine index, sulfur content, non-volatiles and other indicators. The new standard has only 12 points of sulfur in the old standard. One, the aromatics content is close to zero, the non-volatiles are one-third of the old standard, and the benzene content is also more stringent.

The solvent residue analyzer is mainly suitable for: refinery, sanitary door, quality supervision bureau, etc.

step:

1. Take the oil with a lower amount of solvent on the gas chromatograph in advance as a bottom oil prepared by curve (or an edible oil or press oil that removes most of the residual solvent at 70 ° C), and weigh them separately. 25g put 6 people in the top empty bottle, dense plug. Six different concentrations of standards were prepared by injecting the No. 6 solvent standard solution through a stopper. Put in a 50 ° C oven, balance for 30 min, respectively, the gas injection chromatography on the liquid, after subtracting the blank value of each response value, draw a standard curve (multiple chromatographic peaks are calculated by normalization method).

2. Weigh 25g of edible oil sample, heat it in a 50 °C incubator for 30 minutes, and immediately take it out with a micro syringe or syringe to draw 0.10 mL to 0.15 mL of liquid gas (consistent with the standard curve injection volume) into the gas phase. Chromatography, recording single-component or multi-component (normalization method) to measure the peak height or peak area, and comparing with the standard curve, the content of the liquid gas No. 6 solvent was determined.

test methods:

The standard curve is taken from a 60ml vial and added to the machine oil 10g, 8g, 6g, 4g, 2g, 0g and then 100mg/kg standard oil sample to 10g (containing n-hexane 0mg/kg, 20, 40, 60, respectively). 80,100), plug tightly, mix in a constant temperature water bath at 25 ° C for 30 min and carefully shake horizontally for 3 min, pump 1 ml with a syringe and inject 1 ml of air into the vial at 25 ° C and then repeat the injection.

Sample analysis; weigh 10 g of oil sample in a 60 ml vial.

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