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A kind of adsorbent for removing polar molecules in light hydrocarbon stream and its preparation and regeneration method

A polar molecule and adsorbent technology, applied in the fields of adsorbent and its preparation and regeneration, can solve the problems of increasing adsorbent preparation process, no more mention of important indicators of adsorbent adsorption capacity, low adsorption heat adsorption capacity, etc. , to achieve the effect of improving selectivity and adsorption capacity, reasonable surface charge distribution, and simple regeneration method

Active Publication Date: 2017-02-01
HUBEI HUABANG CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patents all propose to reduce the heat of adsorption more effectively when the adsorbent is used while preparing the adsorbent. It can be seen from these patents that the adsorbent made solely with molecular sieves will generate a large amount of heat of adsorption in the purification of olefin materials. Therefore, how to avoid this problem has become the key to the successful application of adsorbents.
While solving this problem, these patents not only increase the preparation process of the adsorbent, but also do not mention the adsorption capacity of the modified adsorbent as another important indicator of actual production and application.
The patent application publication number CN 103816864 A discloses an adsorbent for removing disulfides in liquid hydrocarbons and a preparation method thereof, but the method adopts multiple high-temperature sintering treatments, which inevitably causes damage to the molecular sieve structure. Therefore, it is of great practical significance to develop an adsorbent with low heat of adsorption, high adsorption capacity and simple preparation process and its preparation method for deep removal and purification of polar molecules in hydrocarbon materials.

Method used

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  • A kind of adsorbent for removing polar molecules in light hydrocarbon stream and its preparation and regeneration method
  • A kind of adsorbent for removing polar molecules in light hydrocarbon stream and its preparation and regeneration method
  • A kind of adsorbent for removing polar molecules in light hydrocarbon stream and its preparation and regeneration method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Weigh 30g of Y-type molecular sieve raw powder with a molecular sieve particle size of 0.1 μm and activated alumina (δ-Al 2 o 3 ) 20g in a beaker, slowly add 2.5g of ethylenediamine pore expander into the beaker, place the beaker in a constant temperature water bath with stirring, adjust the temperature to 30°C, stir and react for 2 hours, then dry it for later use, and obtain the adsorbent Masterbatch, the specific surface area of ​​the adsorbent masterbatch is 210m 2 / g;

[0039] (2) Put 50g of the adsorbent masterbatch prepared in the above step (1) into the ion exchange column, slowly add 10% ion exchange solution dropwise from the top of the exchange column, and the ion exchange solution is composed of 7% KNO 3 and 3% lanthanum nitrate, the dropping rate is 50ml / h, after 12h, the adsorbent is taken out and dried; add 0.4% water glass solution to the dried adsorbent masterbatch, and place it in a rolling ball machine for rolling Ball granulation, drying the s...

Embodiment 2

[0042] (1) Weigh 20g of Y-type molecular sieve raw powder with a molecular sieve particle size of 0.5 μm and activated alumina (δ-Al 2 o 3 ) 30g in a beaker, slowly add 2.5g of triethylamine pore-enlarging agent into the beaker, place the beaker in a constant temperature water bath with stirring, adjust the temperature to 20°C, stir for 2 hours and then dry it for later use to obtain the adsorbent Masterbatch, the specific surface area of ​​the adsorbent masterbatch is 205m 2 / g;

[0043] (2) Put 50g of the adsorbent masterbatch prepared in the above step (1) into the ion exchange column, slowly add 6% ion exchange solution dropwise from the top of the exchange column, and the ion exchange solution is composed of 3% KNO 3 and 3% lanthanum nitrate, the dropping rate is 50ml / h, after 4 hours, the adsorbent is taken out and dried; add 0.2% water glass solution to the dried adsorbent masterbatch, and place it in a rolling ball machine for rolling The pellets were granulated, an...

Embodiment 3

[0046] (1) Weigh 30g of Y-type molecular sieve raw powder with a molecular sieve particle size of 1 μm and activated alumina (δ-Al 2 o 3 ) 20g in a beaker, slowly add 2.5g of N,N-dimethyldodecylamine pore expander to the beaker, place the beaker in a constant temperature water bath with stirring, adjust the temperature to 30°C, and stir for 2h After drying for subsequent use, the adsorbent masterbatch is obtained, and the specific surface area of ​​the adsorbent masterbatch is 240m 2 / g;

[0047] (2) Put 50g of the adsorbent masterbatch prepared in the above step (1) into the ion exchange column, slowly add 10% ion exchange solution dropwise from the top of the exchange column, and the ion exchange solution is composed of 7% KNO 3 and 3% lanthanum nitrate, the dropping rate is 50ml / h, after 12h, the adsorbent is taken out and dried; add 0.4% water glass solution to the dried adsorbent masterbatch, and place it in a rolling ball machine for rolling Ball granulation, drying o...

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Abstract

The invention relates to an adsorbent for removing sulfur-and-oxygen-containing impurities from a light hydrocarbon material flow, and a preparation method and a regeneration method of the adsorbent. The adsorbent is prepared by expanding pores by using organic amine, adding an alkali metal salt solution which contains a small quantity of rare earth metals, blending and then adding an adhesive for rolling balls and forming, wherein activated aluminum oxide and kaolin are taken as raw materials; and performing high-temperature roasting and activating after low-temperature drying is performed, wherein the prepared adsorbent consists of Al2O3, SiO2, alkali metal oxides and trace rare earth oxides; the particle diameter of the prepared adsorbent is 2.5 to 5.5mm; the specific surface area of the adsorbent is 260 to 320m<2> / g; the pore volume of the adsorbent is 0.3 to 0.35ml / g. According to the adsorbent, electric charges on the surface of the adsorbent are distributed reasonably by the synergistic effect of introduced different types of rare earth metal elements, the removal precision and the adsorption capacity of the sulfur-and-oxygen-containing impurities by the adsorbent are greatly improved, and meanwhile, the selectivity of the adsorbent on polar molecules is greatly improved by introduced sodium silicate, and overall adsorption heat is reduced. The process is simple; the prepared adsorbent can be regenerated and recycled; the regeneration method is simple.

Description

technical field [0001] The present invention relates to an adsorbent and its preparation and regeneration method, in particular to a method for removing polar molecules such as oxygen-containing compounds (alcohols, aldehydes, ketones, ethers and peroxy compounds) in light hydrocarbon streams, Adsorbents for impurities such as mercaptans and nitrogenous compounds (ammonia, amines and nitriles) and methods for their preparation and regeneration. Background technique [0002] With the continuous development of new technologies, the application range of light hydrocarbon materials has been continuously expanded. At the same time, the emergence of new processes and catalysts in the polyolefin process has higher and higher requirements for impurities in materials. In polyolefin raw materials, all contain H 2 O, O 2 , CO, CO 2 , aldehyde, alcohol, ether, H 2 S, COS, CS 2 , thiol, thioether, NH 3 , amines and other impurities. These impurities have a great impact on the acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30B01J20/34
Inventor 任家君黄艳刚陈义长毛满意胡海平夏明桂王春平吴凡罗念
Owner HUBEI HUABANG CHEM
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