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Aromatic hydrocarbon purifying method

A refining method and technology of aromatics, applied in the direction of chemical recovery, chemical change purification/separation, etc., can solve the problems of hydrothermal stability and poor acidity, hindering application, etc., achieve good activity stability, small environmental impact, and less loss of aromatics Effect

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

However, due to the poor hydrothermal stability and acidity of this mesoporous molecular sieve, its application in petrochemical industry is hindered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Synthesis of Al-SBA-15 Mesoporous / Hβ Microporous Composite Molecular Sieve Catalyst

[0036] 5 g of Hβ microporous molecular sieve powder was used as the inner core, and stirred and mixed with 50 g of distilled water for 1.0 hour to obtain a mixture A. According to the molar ratio of raw materials P123:Al 2 o 3 :SiO2 2 :HCl:H 2 O is calculated as 1:3.1:62.5:300:10000, weigh 20 grams of P123, mix with the calculated amount of distilled water and hydrochloric acid, stir and mix at 40°C for 1.0 hour, add 1.3 grams of monohydrate alumina and continue to stir and mix for 1.0 hour ; 45.0 grams of ethyl orthosilicate was added under stirring conditions to obtain a mixture B. Then, the mixture A was added to the mixture B, and the mixture was stirred and mixed at a temperature of 40° C. for 5.0 hours to obtain a mixed slurry. The mixed slurry was placed in a plastic container, crystallized at 100°C and autogenous pressure for 48 hours, filtered, washed, and dried, and fire...

Embodiment 2～6

[0038] Using the same synthesis method as in Example 1, the difference is that HZSM-5 molecular sieves, HY molecular sieves, HUSY molecular sieves, HMOR molecular sieves, and HMCM-22 molecular sieves are used as cores, and the core microporous molecular sieves are obtained through hydrothermal synthesis and extrusion molding. The Al-SBA-15 mesoporous / microporous core-shell composite molecular sieve catalyst, which accounts for 27.8% of the total mass of the catalyst, is listed in Table 1.

[0039] Table 1

[0040]

Embodiment 7～25

[0042] Using the same synthesis method as in Example 1, the difference is that the three-block polymer P123 is used as a template, and butyl titanate, cobalt nitrate, zinc nitrate, gallium nitrate, manganese nitrate, strontium nitrate, zirconium nitrate, nitric acid Calcium, beryllium nitrate, iron nitrate, nickel nitrate, vanadium nitrate, chromium nitrate, germanium nitrate, tin nitrate, molybdenum nitrate, niobic acid, copper nitrate, tungstic acid as precursors of the substituting element M, according to P123:MO n / 2 :SiO2 2 :HCl:H 2 O is 1:6.25:62.5:300:10000 molar ratio of raw materials to synthesize M-SBA-15 molecular sieve powder containing substituting elements. After extruding and crushing, 20-40 mesh catalyst particles are obtained, which are listed in Table 2.

[0043] Table 2

[0044]

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Abstract

The invention discloses an aromatic hydrocarbon purifying method which comprises the step of carrying out a contact reaction on aromatic hydrocarbon and a solid acid catalyst under the conditions that the temperature is 50-400 DEG C, the pressure is 0.1-12MPa and the feeding mass space velocity is 0.1-15h<-1> to obtain purified aromatic hydrocarbon. The aromatic hydrocarbon purifying 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, the catalyst can be regenerated, 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 refining aromatic hydrocarbons, in particular to a method for removing trace olefins in aromatic hydrocarbons by using a core-shell molecular sieve catalyst for acid-catalyzed reaction. (2) Background technology [0002] Aromatic hydrocarbons are important chemical basic raw materials, and the petrochemical industry produces aromatic hydrocarbons 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 a...

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
CPCY02P20/584
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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