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N-alkane adsorption and separation adsorbent and preparation method thereof

A technology for adsorption and separation of normal alkanes, which is applied in chemical instruments and methods, refined hydrocarbon oil, and other chemical processes, and can solve problems such as long diffusion paths, low active center utilization, and long adsorption/desorption cycles. To achieve the effect of improving the adsorption separation efficiency and the adsorption rate

Pending Publication Date: 2017-07-14
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The 5A molecular sieve synthesized by the traditional method only has a micropore channel structure, and the limited molecular diffusion rate, long diffusion path and low active center utilization in the micropore greatly limit the adsorption / desorption rate, making the adsorption / desorption long cycle time

Method used

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  • N-alkane adsorption and separation adsorbent and preparation method thereof
  • N-alkane adsorption and separation adsorbent and preparation method thereof
  • N-alkane adsorption and separation adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the following molar ratio of raw materials:

[0036] nNa 2 O:nSiO 2 :nAl 2 o 3 :nAOS:nH 2 O=3:2:1:0.021:150

[0037] Weigh the amphiphilic organosilane, silicon source solution, NaOH, aluminum source solution and deionized water and mix evenly,

[0038] Concrete synthetic steps are as follows:

[0039] 1) Weigh a certain amount of amphiphilic organosilane solution according to the proportion, dissolve it in 100ml of water, then add sodium silicate solution and NaOH and stir to dissolve as silicon source. Sodium metaaluminate was dissolved in 50 ml of water as an aluminum source. The aluminum source solution was added dropwise to the silicon source solution at 40° C., vigorously stirred for 10 minutes, and left to age for 2 hours. Move the silicon-aluminum mixture into a crystallization kettle for crystallization at 99±1°C for 4 hours, and cool naturally. The crystallized product was suction-filtered to obtain molecular sieve crystals, washed three ...

Embodiment 2～18

[0043] The steps of the preparation method of the multi-stage porous 5A molecular sieve spherical adsorbent are the same as in Example 1, except that the molar ratio of the components in the raw materials, amphiphilic organosilane, silicon source and aluminum source, and the type of calcium salt used for exchange are different, as shown in the table 1 and 2 are shown.

[0044] Table 1

[0045]

[0046]

[0047] Table 2

[0048]

[0049]

Embodiment 19

[0051] The 5A adsorbent samples prepared in Examples 1-18 were characterized and analyzed using a Micromeritics ASAP 2020 nitrogen physical adsorption instrument. The pretreatment method of the sample before analysis is as follows: vacuumize the molecular sieve sample at room temperature, and when the vacuum condition is reached, treat it at 130°C for 2h; then treat it at 350°C for 2h. The nitrogen physical adsorption results show that samples 1-20 have a micropore diameter of 0.3-0.5 nm, and all contain mesopore diameter distribution, mesopore average pore diameter, mesopore volume and specific surface area as shown in Table 3.

[0052] table 3

[0053]

[0054]

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Abstract

The invention discloses an n-alkane adsorption and separation adsorbent and a preparation method thereof. The preparation method comprises the following steps: adding amphiphilic organosilane used as a soft template into a silicon source and aluminum source mixed sol system, and hydrothermally synthesizing a hierarchical porous 4A molecular sieve with a microporous-mesoporous structure; and removing the soft template from the 4A molecular sieve, rolling the soft template removed 4A molecular sieve and a binder to form small spheres with the particle size of 0.2-0.8 mm, drying and calcining the small spheres, carrying out calcium ion exchange and activation to obtain the 5A molecular sieve adsorbent with a microporous-mesoporous structure. The adsorbent comprises 90-97 wt% of 5A molecular sieve and 3-10 wt% of the binder. The hierarchical porous 5A molecular sieve synthesized in the invention keeps high equilibrium adsorption quantity to n-alkanes, and substantially improves the diffusion coefficient of the n-alkanes in the molecular sieve, so the adsorption and separation rate is improved.

Description

technical field [0001] The present invention relates to a kind of n-alkane adsorption and separation adsorbent and its preparation method, specifically, it is to synthesize a kind of 4A molecular sieve with microporous-mesoporous multi-level pore structure, form it with binder rolling ball, exchange calcium ion The prepared 5A molecular sieve adsorbent can be used to separate and purify normal paraffins from distillate oil containing normal paraffins. Background technique [0002] It is of great significance to separate and purify normal alkanes from fractions of petroleum refining products. For example, the separation of n-paraffins and other hydrocarbons (isoparaffins, naphthenes and aromatics) in naphtha can optimize the feedstock and improve the efficiency of downstream ethylene and reforming units. nC isolated from kerosene fraction 10 ~nC 14 N-alkanes are raw materials for the preparation of detergents. The separation of n-paraffins from gasoline fractions can sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18C01B39/14C10G25/00B01J20/30
CPCB01J20/186C10G25/003C01B39/14
Inventor 王志光李进李小龙王涛王炳春刘国东王建青王庆吉
Owner CHINA CATALYST HLDG CO LTD
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