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Method for removing trace olefin from aromatic hydrocarbon

A technology for the removal of aromatics, applied in the direction of chemical change purification/separation, etc., can solve the problems of poor catalyst activity stability, high catalyst coking deactivation rate, large internal diffusion resistance, etc., to avoid landfill treatment, avoid reaction and regeneration The effect of frequent switching operations and simple process flow

Active Publication Date: 2014-12-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Just because the pore size is too small, the internal diffusion resistance of larger molecules generated by reactions such as olefin superposition is relatively large, resulting in a high rate of coking and deactivation of the catalyst, and poor stability of the catalyst activity.

Method used

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  • Method for removing trace olefin from aromatic hydrocarbon
  • Method for removing trace olefin from aromatic hydrocarbon
  • Method for removing trace olefin from aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Synthesis of B-AlPO 4 -5 / Hβ core-shell composite molecular sieve catalyst, denoted as CAT-1.

[0033] 80 grams of Hβ microporous molecular sieve powder was used as the inner core, and stirred and mixed with 500 grams of deionized water for 1.0 hour to obtain a mixture A. According to Al 2 o 3 :P 2 o 5 :B 2 o 3 :OXAA:H 2 O: ETHA: TEA raw material molar ratio is 1: 0.432: 0.191: 0.304: 25.368: 2.352: 0.756, 40 grams of monohydrate alumina, and the corresponding amount of phosphoric acid (H 3 PO 4 , purity 85wt%), boric acid, oxalic acid (OXAA), deionized water, absolute ethanol (ETHA) and triethylamine (TEA) were stirred and mixed for 0.5 hours to prepare mixture B. Add mixture A to mixture B, continue stirring and mixing for 4.5 hours, place in a stainless steel reactor, and crystallize at 150°C for 3 days; then filter, wash with water, dry, and roast at 550°C for 5 hours to remove the template agent to obtain the inner core Hβ B-AlPO with microporous molecular...

Embodiment 2

[0035] Synthesis of Mg-AlPO 4 -5 / Hβ composite molecular sieve catalyst, denoted as CAT-2.

[0036] 2.0 g of Hβ microporous molecular sieve powder was used as the inner core, and stirred and mixed with 20 g of deionized water for 1.0 hour to obtain a mixture A. According to Al 2 o 3 :P 2 o 5 :MgO:OXAA:H 2 O: ETHA: TPA raw material molar ratio 1: 0.541: 0.227: 0.061: 27.482: 2.353: 0.758, 40 grams of monohydrate alumina, and the corresponding amount of phosphoric acid (H 3 PO 4 , 85Wt%), magnesium acetate, oxalic acid (OXAA), deionized water, ethanol (ETHA), and tri-n-propylamine (TPA) were stirred and mixed for 0.5 hours to prepare mixture B. Add mixture A to mixture B, continue stirring and mixing for 4.5 hours, place in a stainless steel reactor, and crystallize at 150°C for 3 days; then filter, wash with water, dry, and roast at 550°C for 5 hours to remove the template agent to obtain the inner core Hβ Mg-AlPO with microporous molecular sieve mass accounting for 1.3%...

Embodiment 3～7

[0038] HZSM-5 molecular sieve, HY molecular sieve, HUSY molecular sieve, HMOR molecular sieve, HMCM-22 molecular sieve were used as core microporous molecular sieves respectively, and after hydrothermal synthesis, B-AlPO with core microporous molecular sieves accounting for 34.8% was obtained. 4 The core-shell type composite molecular sieve catalyst of -5 / microporous molecular sieve, other operations are the same as in Example 1, and the results are listed in Table 1.

[0039] Table 1

[0040]

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Abstract

The invention discloses a method for removing trace olefin from aromatic hydrocarbon. The method comprises the step of carrying out contact reaction on aromatic hydrocarbon and a solid acid catalyst under the conditions that the temperature is 30-400 DEG C, the pressure is 0.1-12MPa and the feeding mass space velocity is 0.1-15h<-1> to obtain aromatic hydrocarbon after the olefin is removed. The method is simple in process without consuming hydrogen, low in device investment and operation cost, good in catalyst activity stability, long in device stable operation time and less in aromatic hydrocarbon loss; and reactor reaction and regeneration frequent switching operation can be avoided and a large quantity of waste catalysts can be prevented from being stacked and embedded, and environment influence is little.

Description

(1) Technical field [0001] The invention relates to a method for removing trace olefins in aromatic hydrocarbons, in particular to a method for removing trace olefins in aromatic hydrocarbons by using a solid acid catalyst for reaction. (2) Background technology [0002] The petrochemical industry produces aromatics through processes such as naphtha reforming and steam cracking. A certain amount of olefin impurities (less than 1%) exist in the aromatic products of these processes. This part of olefin impurities affects the quality of aromatic products and has adverse effects on some subsequent chemical processes. Therefore, in order to obtain qualified aromatic hydrocarbon raw materials and ensure the smooth progress of subsequent processes, it is necessary to deeply remove the olefin impurities in aromatic hydrocarbons. At present, the methods widely used by refineries at home and abroad to remove olefin impurities in aromatics products mainly include hydrorefining and cla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/148C07C15/02C07C15/04C07C15/06C07C15/08
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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