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Modified 5A molecular sieve used for removing small-amount n-hexane from isohexane and regeneration method thereof

A molecular sieve and isohexane technology, applied in the field of modified 5A molecular sieve, in the field of regeneration of the 5A molecular sieve, can solve the problems of blocking the molecular sieve, reducing the desorption effect, affecting the continuous operation of the molecular sieve on n-hexane, etc., and achieving the effect of avoiding carbon deposition.

Active Publication Date: 2015-09-09
岳阳金瀚高新技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in the desorption process of n-hexane, the general desorption method is the decompression and high-temperature method, but in this method, n-hexane is easily carbonized due to the local high temperature inside the pores, which blocks the pores of molecular sieves and reduces the desorption rate. effect, affecting the continuous operation of molecular sieves for n-hexane adsorption

Method used

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  • Modified 5A molecular sieve used for removing small-amount n-hexane from isohexane and regeneration method thereof
  • Modified 5A molecular sieve used for removing small-amount n-hexane from isohexane and regeneration method thereof

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Embodiment 1

[0023] The modified 5A molecular sieve used in the present invention is a 5A molecular sieve after oxalic acid has removed non-framework aluminum, which means that the 5A molecular sieve to be modified is soaked and dealuminated with an ethanol solution of oxalic acid to obtain the modified 5A molecular sieve.

[0024] The modification method includes the following steps:

[0025] Soak 120 g of molecular sieves for 2 hours with a volume of 180 mL of oxalic acid ethanol solution with a concentration of 0.38 mol / L to remove non-framework aluminum. The dealumed molecular sieve was washed with water and activated at 500°C for 4 hours, and then placed in a desiccator to cool down to obtain a modified 5A molecular sieve.

[0026] Such as figure 1 As shown, the above modified 5A molecular sieve was used to adsorb a small amount of n-hexane in isohexane, and the adsorption effect of the 5A molecular sieve before modification was compared. It can be clearly seen that the 5A molecular sieve t...

Embodiment 2

[0031] The modified 5A molecular sieve used in the present invention is a 5A molecular sieve after oxalic acid has removed non-framework aluminum, which means that the 5A molecular sieve to be modified is soaked and dealuminated with an ethanol solution of oxalic acid to obtain the modified 5A molecular sieve.

[0032] The modification method includes the following steps: soak 120 g of molecular sieve with a volume of 180 mL of a 0.19 mol / L oxalic acid ethanol solution for 2 hours to remove non-framework aluminum. The dealumed molecular sieve was washed with water and activated at 500℃ for 4h, and then placed in a desiccator to cool.

[0033] The above modified 5A molecular sieve is used to adsorb a small amount of n-hexane in isohexane.

[0034] After the molecular sieve adsorbs n-hexane, the regeneration process is performed. First, pass 110°C steam into the molecular sieve for 1 hour to replace the n-hexane in its micropores, and then purge the molecular sieve with nitrogen at a ...

Embodiment 3

[0036] The modified 5A molecular sieve used in the present invention is a 5A molecular sieve obtained by removing non-framework aluminum from oxalic acid. The modification method includes the following steps: soak 120 g of molecular sieve with a volume of 180 mL of a 0.5 mol / L oxalic acid ethanol solution for 2 hours to remove non-framework aluminum. The dealumed molecular sieve was washed with water and activated at 500℃ for 4h, and then placed in a desiccator to cool.

[0037] The above modified 5A molecular sieve is used to adsorb a small amount of n-hexane in isohexane.

[0038] After the molecular sieve adsorbs n-hexane, the regeneration process is performed. First pass 110°C steam into the molecular sieve for 3h to replace the n-hexane in its micropores, and then purge it with 2L / min (20°C, 0.35MPa) nitrogen at 250°C for 3h, and the entire regeneration process is completed. Then the adsorption of n-hexane can be repeated.

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Abstract

Disclosed is a modified 5A molecular sieve used for removing small-amount n-hexane from isohexane. The 5A molecular sieve to be modified is soaked and dealuminized through the ethanol solution of oxalic acid, and the modified 5A molecular sieve is obtained accordingly. Meanwhile, the invention discloses a regeneration method of the modified 5A molecular sieve after the n-hexane is absorbed. The modified 5A molecular sieve and method have the advantages that the modified 5A molecular sieve has larger porosity, the absorption amount of the n-hexane is increased, and more isohexane (containing small amount of n-hexane) can be treated; by means of the vapor replacement method, carbon deposition due to local excessively high temperature when the n-hexane is removed through high temperature and pressure directly is avoided.

Description

Technical field [0001] The present invention relates to the field of chemical separation, in particular to a modified 5A molecular sieve used to remove a small amount of n-hexane contained in isohexane, and also relates to a regeneration method of the 5A molecular sieve. Background technique [0002] Industrial isohexane is a widely used solvent. Because of its low boiling point, low aromatic hydrocarbons, low sulfur, low latent heat of vaporization, easy removal, odorless, colorless, and non-toxic, it is mainly used in grease Extraction, leaching, extraction, essential oil diluent, precision instrument cleaning agent, low toxicity adhesive, aerosol, etc. Especially in the extraction of oils and fats, with social development and population increase, the market demand for isohexane will greatly increase. [0003] However, industrially produced isohexane often contains a small amount of n-hexane. While n-hexane has obvious toxic effects on the nervous system, when its mass ratio ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/34
Inventor 彭磊李自力彭长根杨钦葛文托
Owner 岳阳金瀚高新技术股份有限公司
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