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Modified 5a molecular sieve for removing a small amount of n-hexane in isohexane and its regeneration method

A technology of molecular sieve and isohexane, which is applied in the field of regeneration of modified 5A molecular sieve, which can solve the problems of clogging molecular sieve, reducing the desorption effect, affecting the continuous operation of molecular sieve to n-hexane, etc., so as to avoid the effect of carbon deposition

Active Publication Date: 2017-11-21
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 for removing a small amount of n-hexane in isohexane and its regeneration method
  • Modified 5a molecular sieve for removing a small amount of n-hexane in isohexane and its regeneration method

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Embodiment 1

[0023] The modified 5A molecular sieve used in the present invention is a 5A molecular sieve obtained by removing non-skeleton aluminum with oxalic acid, which means that the modified 5A molecular sieve is obtained by soaking and dealuminating the 5A molecular sieve to be modified with an ethanol solution of oxalic acid.

[0024] Its modification method comprises the following steps:

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

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

Embodiment 2

[0031] The modified 5A molecular sieve used in the present invention is a 5A molecular sieve obtained by removing non-skeleton aluminum with oxalic acid, which means that the modified 5A molecular sieve is obtained by soaking and dealuminating the 5A molecular sieve to be modified with an ethanol solution of oxalic acid.

[0032] The modification method includes the following steps: soak 120 g of molecular sieves in 180 mL of oxalic acid ethanol solution with a concentration of 0.19 mol / L for 2 hours to remove non-skeleton aluminum. After the dealuminated molecular sieves were washed with water, they were activated at 500°C for 4 hours, and then cooled in a desiccator.

[0033] Use the above-mentioned modified 5A molecular sieve to adsorb a small amount of n-hexane in isohexane.

[0034] After the molecular sieve absorbs n-hexane, it will be regenerated. First pass water vapor at 110°C into the molecular sieve for 1 hour to replace the n-hexane in its micropores, and then pur...

Embodiment 3

[0036] The modified 5A molecular sieve used in the present invention is the 5A molecular sieve obtained by removing non-framework aluminum from oxalic acid. The modification method includes the following steps: soak 120 g of molecular sieves in 180 mL of oxalic acid ethanol solution with a concentration of 0.5 mol / L for 2 hours to remove non-skeleton aluminum. After the dealuminated molecular sieves were washed with water, they were activated at 500°C for 4 hours, and then cooled in a desiccator.

[0037] Use the above-mentioned modified 5A molecular sieve to adsorb a small amount of n-hexane in isohexane.

[0038] After the molecular sieve absorbs n-hexane, it will be regenerated. First pass 110°C water vapor into the molecular sieve for 3 hours to replace the n-hexane in its micropores, and then purge with nitrogen gas with a flow rate of 2L / min (20°C, 0.35MPa) at 250°C for 3 hours, and the entire regeneration process is completed. The adsorption of n-hexane can then be re...

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Abstract

The modified 5A molecular sieve for removing a small amount of n-hexane in isohexane refers to soaking and dealuminating the 5A molecular sieve to be modified with an ethanol solution of oxalic acid to obtain a modified 5A molecular sieve. At the same time, the invention discloses a regeneration method of the modified 5A molecular sieve after absorbing n-hexane. The beneficial effects of the present invention are as follows: 1) The modified 5A molecular sieve has larger porosity and larger adsorption capacity for n-hexane, so it can handle more isohexane (containing a small amount of n-hexane); 2) Water vapor in the regeneration process The replacement method avoids the carbon deposition phenomenon caused by the local high temperature that occurs in the direct high-temperature decompression desorption of n-hexane.

Description

technical field [0001] The invention relates to the field of chemical separation, specifically a modified 5A molecular sieve for removing a small amount of n-hexane contained in isohexane, and also relates to a regeneration method of the 5A molecular sieve. Background technique [0002] As a widely used solvent, industrial isohexane is mainly used in oils and fats due to its low boiling point, low aromatics, low sulfur, low latent heat of vaporization, easy removal, odorless, colorless and non-toxic. Extraction, leaching, extraction, essential oil diluent, cleaning agent for precision instruments, can also be used as low toxicity adhesive, aerosol, etc. Especially in the extraction of oils and fats, with the development of society and the increase of population, the market demand for isohexane will be greatly increased. [0003] However, industrially produced isohexane often contains a small amount of n-hexane. However, n-hexane has obvious toxic effects on the nervous sys...

Claims

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Application Information

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Patent Type & Authority Patents(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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