Method for removing trace olefin from aromatic hydrocarbon

An aromatics and removal technology, applied in the direction of chemical change purification/separation, organic chemistry, etc., can solve the problems of poor catalyst activity stability, large internal diffusion resistance, large catalyst coking deactivation rate, etc. Simple process, avoids reaction and regenerates the effect of frequent switching operations

Active 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

Just because the pore size is too small, the internal diffusion resistance of larger molecules generated by reactions such as olefin superpo

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

Example Embodiment

[0031] Example 1:

[0032] Synthetic 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 core, and 500 grams of deionized water was stirred and mixed for 1.0 hour to obtain a mixture A. Follow Al 2 O 3 : P 2 O 5 : B 2 O 3 : OXAA: H 2 O: ETHA: The molar ratio of TEA raw materials 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, anhydrous ethanol (ETHA) and triethylamine (TEA) mixture was stirred and mixed for 0.5 hours to prepare mixture B. Add mixture A to mixture B, continue to stir and mix for 4.5 hours, place it in a stainless steel reactor, crystallize at 150°C for 3 days; then filter, wash, dry, and roast at 550°C for 5 hours to remove the template to obtain the inner core Hβ Microporous molecular sieve mass accounts for 34.8%...

Example Embodiment

[0034] Example 2:

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

[0036] Using 2.0 g of Hβ microporous molecular sieve powder as the core, stirring and mixing with 20 g of deionized water for 1.0 hour, to obtain a mixture A. Follow 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 alumina monohydrate, and the corresponding amount of phosphoric acid (H 3 PO 4 , 85wt%), magnesium acetate, oxalic acid (OXAA), deionized water, ethanol (ETHA), tri-n-propylamine (TPA) mixture was stirred and mixed for 0.5 hours to prepare mixture B. Add mixture A to mixture B, continue to stir and mix for 4.5 hours, place it in a stainless steel reactor, crystallize at 150°C for 3 days; then filter, wash, dry, and roast at 550°C for 5 hours to remove the template to obtain the inner core Hβ Microporous molecular sieve mass accounts for 1.3% Mg-AlPO 4 -5 / Hβ core-shell composite molecular...

Example

[0037] Examples 3-7:

[0038] Using HZSM-5 molecular sieve, HY molecular sieve, HUSY molecular sieve, HMOR molecular sieve, HMCM-22 molecular sieve as the inner microporous molecular sieve, after hydrothermal synthesis, B-AlPO with the inner microporous molecular sieve mass accounted for 34.8% 4 -5 / microporous molecular sieve core-shell composite molecular sieve catalyst, 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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IPC IPC(8): C07C7/148C07C15/02C07C15/04C07C15/06C07C15/08
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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