Preparation method of porous 5A molecular sieve for straight-chain alkane adsorption

A technology of straight-chain alkanes and molecular sieves, applied in chemical instruments and methods, A-type crystalline aluminum silicate zeolite, and other chemical processes to achieve good saturation adsorption effect

Inactive Publication Date: 2014-09-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no domestic research on the application of 5A molecular sieve prepared with tetraethyl orthosilicate as silicon source to the adsorption of heavy liquid wax. The inventor of this case proposed a preparation method of porous 5A molecular sieve for linear alkanes adsorption, and applied it to linear Adsorption separation of alkanes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation of 5A molecular sieve includes hydrolysis of ethyl orthosilicate, hydrothermal synthesis and calcium ion exchange.

[0025]

Embodiment 1

[0026] Example 1 (according to the molar ratio Na 2 O: SiO 2 = 10:2 prepared molecular sieve):

[0027] According to the amount added to control the molar ratio 10molNa 2 O: 2SiO 2 :300molH 2 O, weigh 2.96g of sodium hydroxide, add 40mL of water, ultrasonically dissolve it evenly, then weigh 3.09g of ethyl orthosilicate, add it dropwise to the sodium hydroxide solution, stir magnetically at room temperature for 1h, and obtain solution a ; Control the molar ratio 1molAl according to the amount added 2 o 3 :300molH 2 O, weigh 1.21g of sodium metaaluminate, add 40mL of water, and ultrasonically dissolve it evenly to obtain solution b; quickly pour a into b, stir vigorously for 6 hours to obtain a milky white gel, crystallize at 90°C for 24 hours , cooled, the obtained solid was suction filtered, washed to pH<9, and dried to obtain the original powder of 4A molecular sieve; the original powder of 4A molecular sieve was mixed into 1mol / L calcium chloride solution at a solid...

Embodiment 2

[0028] Embodiment 2 (according to molar ratio Na 2 O: SiO 2 = 15:2 prepared molecular sieve):

[0029] Control the molar ratio 15molNa according to the amount added 2 O: 2SiO 2 :300molH 2 O, weigh 4.44g of sodium hydroxide, add 40mL of water, ultrasonically dissolve it evenly, then weigh 3.09g of ethyl orthosilicate, add it dropwise to the sodium hydroxide solution, stir magnetically at room temperature for 1h, and obtain solution a ; Control the molar ratio 1molAl according to the amount added 2 o 3 :300molH 2 O, weigh 1.21g of sodium metaaluminate, add 40mL of water, stir to dissolve it evenly, and obtain solution b; quickly pour a into b, stir vigorously for 6h to obtain a milky white gel, crystallize at 90°C for 48h , cooled, the obtained solid was suction-filtered, washed until pH<9, and dried to obtain the original powder of 4A molecular sieve; the original powder of 4A molecular sieve was mixed into 1mol / L calcium chloride solution at a solid-liquid ratio of 1:5...

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PUM

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Abstract

The invention discloses a preparation method of a porous 5A molecular sieve for straight-chain alkane adsorption and belongs to the technical field of molecular sieve adsorbents. The preparation method comprises the following steps of adding ethyl orthosilicate into a sodium hydroxide aqueous solution, carrying out stirring for some time, fully dissolving sodium metaaluminate in water, fast mixing the two solutions, carrying out violent stirring to obtain milky colloid, carrying out crystallization on the colloid at a temperature of 80-95 DEG C for 4-6h, carrying out cooling, carrying out filtration, carrying out washing until a pH value is less than 9, carrying out drying by an oven to obtain 4A molecular sieve raw powder, carrying out ion exchange on the 4A molecular sieve raw powder and a calcium chloride solution to obtain the 5A molecular sieve. The 5A molecular sieve has n-decane static saturated adsorption capacity of 0.538g/g and n-pentdecne static saturated adsorption capacity of 0.647g/g. The 5A molecular sieve is prepared from an organic silicon source ethyl orthosilicate replacing an inorganic silicon source sodium silicate so that the channels of the 5A molecular sieve have diversity. The 5A molecular sieve has a good saturation adsorption amount of straight-chain alkanes.

Description

technical field [0001] The invention relates to a preparation method of a porous 5A molecular sieve for straight-chain alkane adsorption. n -C 10 ~ Pentadecane n -C 15 ) has better adsorption selectivity and equilibrium adsorption capacity, and belongs to the technical field of molecular sieve adsorbents. Background technique [0002] Selective adsorption of liquid wax (n-alkanes C) from straight-run kerosene 10 -C 15 ) molecular sieve dewaxing technology, mainly using 5A molecular sieve adsorbent. The actual effective pore diameter of 5A molecular sieve is 0.51nm, the maximum critical diameter of n-alkane molecules is about 0.49nm, the minimum diameter of isoparaffins, naphthenes and aromatic hydrocarbons is above 0.55nm, and the effective pore diameter of 5A molecular sieve is in the range of n-alkane Between the critical diameter of molecules and non-n-alkane molecules, 5A molecular sieve can selectively adsorb n-alkane, so as to realize the separation of n-iso-alka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14B01J20/18B01J20/30
Inventor 陈乐楚迎亚陈群何明阳
Owner CHANGZHOU UNIV
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