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Method for purifying high-purity organic solvent-normal hexane for scientific research

A technology of organic solvent and purification method, which is applied in the field of purification of high-purity organic solvent n-hexane for scientific research, which can solve problems such as high production cost, insufficient product purity, and complicated production process, so as to save manpower and energy consumption and achieve high product purity , the effect of stable operation

Active Publication Date: 2009-09-30
天津市康科德科技有限公司
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Problems solved by technology

Because the boiling point of impurities is similar to that of n-hexane, it is very difficult to remove impurities in rectification. For example, precision rectification and special rectification process have disadvantages such as high energy consumption, high production cost, low yield and complicated production process.
At present, there are very few domestic reports on the purification method of high-purity n-hexane. Among them, the patent application number is: 200710133498.9. The reformed raffinate, 60-80°C petroleum distillate, No. 6 solvent oil or industrial hexane extraction and purification of n-hexane, the equipment is special equipment, and the purity after purification is 95-98%, the product purity is not enough, the process More complex, the resulting product cannot meet the needs of scientific research

Method used

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  • Method for purifying high-purity organic solvent-normal hexane for scientific research

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Embodiment 1

[0018] A method for purifying high-purity organic solvent n-hexane for scientific research, the steps are as follows:

[0019] 1. Lift the raw material n-hexane (content is about 95%) to the top of the adsorption tower. The adsorption tower is 2M high and 20cm in diameter. Adsorption is carried out. In the tower, n-hexane is in full contact with the adsorbent zeolite, so that hydrocarbon impurities with different physical and chemical properties and similar boiling points are adsorbed, and the quality of the adsorbed liquid is detected until the adsorption liquid is qualified (that is, the indicators of the effluent are Close to the requirements of chromatographic grade and pesticide residue grade, the specific requirements are shown in Table 1); before removing the fraction;

[0020] 2. Flow the qualified adsorption effluent into the drying tower, control the flow rate of 30mL / min, the tower height is 2M, and the diameter is 15cm, and put it into the baked and dried molecular...

Embodiment 2

[0023] A method for purifying high-purity organic solvent n-hexane for scientific research, the steps are as follows:

[0024] 1. Lift the raw material n-hexane (content is about 95%) to the top of the adsorption tower. The adsorption tower is 2M high and 20cm in diameter. Adsorption is carried out, and the quality of the adsorption liquid is detected until the absorption liquid is qualified; the previous fraction is removed;

[0025] 2. Flow the qualified adsorption outflow n-hexane into the drying tower, control the flow rate at 50mL / min, the drying tower is 2M high and 15cm in diameter, put it into the baked and dried molecular sieve, measure the water content of the dried n-hexane, moisture Control at ≤0.02%; when the moisture content is ≥0.05%, it can indicate that the molecular sieve is saturated with water, and the molecular sieve must be released for re-drying and regenerated for use;

[0026] 3. Flow the above-mentioned dried n-hexane into a 120L stainless steel rect...

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Abstract

The invention relates to a method for purifying a high-purity organic solvent-normal hexane for scientific research, which comprises the main steps of: adopting an adsorbent, namely zeolite for adsorption separation, removing impurities with the boiling point similar to that of normal hexane, using a molecular sieve to dry to remove the moisture in the normal hexane, purifying the normal hexane by rectification after the drying, and filtering and packaging the normal hexane to obtain a finished product. The method takes the normal hexane with the content of 95 percent as a raw material, can obtain a chromatographic grade normal hexane product with the purity more than 98 percent after the purification, ensure that the yield is more than 93 percent and the qualification rate is 92 percent, and can obtain a 5o to 60 percent pesticide residue grade normal hexane reagent. Compared with the prior method, the method has high product purity, simple and convenient operation and stable operation, and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for purifying an organic solvent, in particular to a method for purifying a high-purity organic solvent n-hexane for scientific research. Background technique [0002] n-Hexane is one of the most widely used hydrocarbon solvents in industry today, and it is also the most representative non-polar solvent. N-hexane is obtained by rectification from natural gasoline, straight-run gasoline and light components, which contains impurities such as hydrocarbons with similar boiling points and water. Since the boiling point of impurities is similar to that of n-hexane, it is very difficult to remove impurities in rectification. For example, precision rectification and special rectification process have disadvantages such as high energy consumption, high production cost, low yield and complicated production process. At present, there are very few domestic reports on the pu...

Claims

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Application Information

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IPC IPC(8): C07C9/15C07C7/12C07C7/04
Inventor 宋金链张玉芝
Owner 天津市康科德科技有限公司
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