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Method for removing trace hydrocarbon from aromatic hydrocarbon by utilizing AlPO4-5 type Al-P molecular sieve

A phospho-aluminum molecular sieve, aromatic hydrocarbon technology, applied in molecular sieve catalyst, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of weak surface acidity, hindering application, etc., achieves small environmental impact, good activity stability, process Simple process effect

Inactive Publication Date: 2013-04-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak surface acidity of this molecular sieve, its application in the petrochemical field is hindered.

Method used

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  • Method for removing trace hydrocarbon from aromatic hydrocarbon by utilizing AlPO4-5 type Al-P molecular sieve
  • Method for removing trace hydrocarbon from aromatic hydrocarbon by utilizing AlPO4-5 type Al-P molecular sieve
  • Method for removing trace hydrocarbon from aromatic hydrocarbon by utilizing AlPO4-5 type Al-P molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Synthesis of B-AlPO 4 -5 molecular sieve catalyst, denoted as CAT-1.

[0029] According to Al 2 o 3 :P 2 o 5 :B 2 o 3 :OXAA:H 2 O: ETHA: TYEA raw material molar ratio 1: 0.432: 0.191: 0.304: 25.368: 2.352: 0.756, weigh 40 grams of monohydrate alumina (Shandong Aluminum Group Corporation), and the corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), boric acid, oxalic acid (OXAA), deionized water, ethanol (ETHA) and triethylamine (TYEA), prepare a mixed solution, stir and mix at room temperature (25°C) for 3 hours and then place it in a crystallization reactor crystallized at 150°C for 3 days; then filtered, washed with water, dried, and calcined at 550°C for 5 hours to obtain anhydrous chemical composition (B 0.118 al 0.616 P 0.266 )O 2 The boron isomorphously substituted borophosphorus aluminum molecular sieve, denoted as CAT-1.

Embodiment 2

[0031] Synthesis of Mg-AlPO 4-5 molecular sieve catalyst, denoted as CAT-2.

[0032] According to Al 2 o 3 :P 2 o 5 :MgO:OXAA:H 2 O: ETHA: TPPA raw material molar ratio 1: 0.812: 0.423: 0.061: 33.516: 4.362: 1.348, weigh 40 grams of monohydrate alumina, and the corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), magnesium acetate, oxalic acid (OXAA), distilled water, ethanol (ETHA), tri-n-propylamine (TPPA), prepared a mixed solution, stirred and mixed at room temperature for 8 hours, then placed in a crystallization reactor, crystallized at 180 ° C 1 day; then filtered, washed with water, dried, and roasted at 600°C for 3 hours to obtain anhydrous chemical composition (Mg 0.105 Al 0.494 P 0.401 )O 2 Magnesium phosphorus aluminum molecular sieve.

Embodiment 3

[0034] Synthesis of Si-Nb-AlPO 4 -5 molecular sieve catalyst, denoted as CAT-3.

[0035] According to Al 2 o 3 :P 2 o 5 : Nb 2 o 5 : SiO 2 :H 2 O: TEAN raw material molar ratio 1: 1.435: 0.316: 0.465: 48.625: 2.863, weigh 40 grams of monohydrate alumina, and the corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), niobic acid, silica sol, deionized water and triethanolamine (TEAN), prepare a mixed solution, stir and mix at room temperature for 10 hours, then place it in a crystallization reactor, crystallize at 120°C for 5 days; then filter , washed with water, dried, and calcined at 500°C for 5 hours to obtain anhydrous chemical composition (Si 0.078 Nb 0.106 Al 0.335 P 0.481 )O 2 Silicon-niobium-phosphorus-aluminum molecular sieves isomorphously substituted by silicon and niobium.

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Abstract

The invention discloses a method for removing trace hydrocarbon from aromatic hydrocarbon by utilizing an AlPO4-5 type Al-P molecular sieve. The method comprises the following steps: allowing aromatic hydrocarbon to contact and react with solid acid catalyst under conditions that the temperature is between 30 and 350 DEG C, the pressure is between 0.1 and 12MPa and the mass space velocity is between 0.1 and 15 hour<-1> to obtain hydrocarbon removed aromatic hydrocarbon, wherein the hydrocarbon is reformed oil, reformed hydrocarbon or aromatic hydrocarbon generated by steam cracking. The method is simple in process flow, does not consume hydrogen, and is low in device investment and operation cost; the catalyst is good in activity stability, the device is stable and long in operation time, less hydrocarbon is lost, and operation of frequent switching between reaction and regeneration of the reactor can be avoided; and the catalyst is reproducible to avoid massive waste catalyst accumulation and bury, and has small influence on the environment.

Description

(1) Technical field [0001] The invention relates to a method for removing trace olefins in aromatic hydrocarbons, especially a method using a solid acid catalyst, that is, AlPO 4 -A method for removing trace olefins in aromatic hydrocarbons by reacting with 5-type aluminum phosphorus molecular sieves. (2) Background technology [0002] Petrochemical companies mainly use catalytic reforming and aromatics extraction combined devices to produce aromatics such as benzene, toluene, and xylene. Catalytic reforming converts the naphtha fraction into reformate oil, which is rich in aromatics and solvent oil fractions, and also contains a small amount of olefins. This part of olefin impurities affects the aromatics extraction operation and the quality of aromatics products, and also affects some subsequent chemical processes. Therefore, in order to obtain qualified aromatic hydrocarbon raw materials and ensure the smooth progress of subsequent processes, the olefin impurities in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/05C10G67/06C07C7/163C07C15/00B01J29/84B01J29/85
CPCY02P20/584
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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