Adsorbent for separating ethylbenzene from C8 aromatic hydrocarbon and preparation method thereof

A technology of carbon octane aromatics and adsorbent, which is applied in the field of adsorbent and its preparation for the separation of ethylbenzene from mixed carbon octane aromatics, which can solve the problems of reduced separation capacity and separation performance of adsorbents, and achieve reduced operating severity and improved The effect of economic benefits

Active Publication Date: 2022-03-11
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that is difficult to solve is that during the actual operation of industrial devices, raw materials or desorbents will inevitably contain trace amounts of water. As the operation time prolongs, water molecules will continue to accumulate on the adsorbent, resulting in a decrease in the separation capacity of the adsorbent.
However, none of the above-mentioned patents involves how to improve the hydrophobicity of the ethylbenzene adsorbent as much as possible under the premise of maintaining a high separation selectivity of ethylbenzene, so as to avoid the decline in separation performance due to water absorption during use.

Method used

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  • Adsorbent for separating ethylbenzene from C8 aromatic hydrocarbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Fully mix 5 kg X zeolite with 0.48 kg kaolin to form a mixed powder. Put the powder into the turntable of the sugar coating machine and spray an appropriate amount of water while rolling to make the powder roll into a ball. The total amount of water added in the whole ball rolling process is about 30wt% of the total mass of the powder. The pellets with a particle size of 20-50 mesh were sieved and dried at 140°C for 10 hours.

[0036] (2) Dissolve 3.4 kg of cesium chloride in 40 L of deionized water to prepare a solution for ion exchange of X zeolite pellets.

[0037] (3) Put 4 kg of the dried pellets described in (1) into an exchange kettle, add them into the CsCl solution prepared in (2), and perform ion exchange at 95 °C for 4 h. After the exchange, rinse the exchanged pellets with copious amounts of deionized water. Then, the rinsed pellets were dried at 200°C for 10 hours.

[0038] (4) Dissolve 1.49 kg tetraethyl orthosilicate in 15 kg cyclohexane solution ...

Embodiment 2

[0043] The total amount of water added in the ball rolling process in step (1) is about 40wt% of the total mass of the powder, and other conditions are consistent with Example 1;

[0044] The alkali metal salt adopted in the step (2) is rubidium chloride, and the addition is 2.42 kg, and other conditions are consistent with embodiment 1;

[0045] Step (3) is consistent with embodiment 1;

[0046] Step (4) The organosilicon ester is vinyltrichlorosilane, the dosage is 3.86kg, and the other conditions are the same as in Example 1;

[0047] The roasting atmosphere of step (5) is a helium atmosphere, and other conditions are consistent with embodiment 1;

[0048] Step (6) is consistent with embodiment 1;

[0049] Step (7) is consistent with Example 1.

Embodiment 3

[0051] The total amount of water added in the ball rolling process in step (1) is about 50wt% of the total mass of the powder, and other conditions are consistent with Example 1;

[0052] The alkali metal salt adopted in the step (2) is potassium chloride, and the addition amount is 1.5 kg, and other conditions are consistent with embodiment 1;

[0053] Step (3) is consistent with embodiment 1;

[0054] The organosilicon ester used in step (4) is methylvinyldichlorosilane, the dosage is 5.04kg, and other conditions are consistent with Example 1;

[0055] The roasting atmosphere of step (5) is an argon atmosphere, and other conditions are consistent with embodiment 1;

[0056] Step (6) is consistent with embodiment 1;

[0057] Step (7) is consistent with Example 1.

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Abstract

The invention discloses an adsorbent for separating ethylbenzene in C8 aromatic hydrocarbon and a preparation method thereof, the adsorbent mainly comprises X zeolite, the silica-alumina ratio (SiO2 / Al2O3) of the adsorbent is 2.0-2.3, the grain size of the adsorbent is 0.5-5 [mu] m, and the adsorbent is prepared by treating the X zeolite through a combined treatment process of alkali metal ion exchange and surface estersil modification. The adsorbent provided by the invention can separate ethylbenzene from mixed C8 aromatic hydrocarbons, and the ethylbenzene product has high purity and yield.

Description

technical field [0001] The invention belongs to the technical field of preparation of zeolite-type adsorbents, and in particular relates to an adsorbent capable of separating ethylbenzene from mixed C8 aromatics through adsorption and a preparation method thereof. Background technique [0002] Ethylbenzene is an important basic chemical raw material, and more than 99% of ethylbenzene is used to produce styrene. In 2020, the demand for styrene in my country will be higher than 11 million tons per year, and the import volume will remain above 2.5 million tons per year, indicating a significant market gap. In the face of the current complex international environment, it is of great economic and strategic significance to further develop my country's ethylbenzene production technology and make up for the market gap of the downstream product styrene. The current ethylbenzene production technology is mainly the alkylation of benzene and ethylene. Due to the occurrence of excessiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30
CPCB01J20/186Y02P20/50
Inventor 赵云李犇汪洋胡智中李滨郭春垒臧甲忠赵闯陈自浩于海斌
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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