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Aromatization method

An aromatization and structural formula technology, applied in the field of aromatization, can solve problems such as the inevitable generation of olefin species and catalyst deactivation

Active Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that olefin species are inevitably produced during the aromatization process of levulinic acid compounds, thereby generating carbon deposits and causing catalyst deactivation, and providing a new aromatization method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh 35 grams of ZSM-5 with a silicon-to-aluminum ratio of 25 and 35 grams of γ-alumina, add 2.7 grams of sesame powder, and mix well. Then, 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5% was added, kneaded and formed, and extruded. The obtained catalyst precursor was dried at 120°C for 8 hours, calcined at 500°C for 2 hours, and impregnated with Zn(NO 3 ) 2 The Zn addition amount is 1%, and the molecular sieve catalyst is obtained by roasting after drying.

[0050] Weigh 60 grams of corn stalks, place them in an autoclave and add 700 grams of water, then add a 5mol / L sulfuric acid solution with 7% water mass, heat up to 200°C and react for 45 minutes, and then cool down. The cooled reaction solution Filter to obtain a filter cake and a filtrate. The filtrate is a cellulose hydrolysate. After the reaction, mass spectrometry is used to identify the main product of the reaction result as levulinic acid, and the amount produced is 24 g...

Embodiment 2

[0053] Weigh 35 grams of ZSM-5 with a silicon-to-aluminum ratio of 50 and 35 grams of pseudo-boehmite, add 2.7 grams of Sesbania powder, and mix well. Then, 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5% was added, kneaded and formed, and extruded. The obtained catalyst precursor was dried at 120°C for 8 hours, calcined at 500°C for 2 hours, and impregnated with Cu(NO 3 ) 2 , Cu addition amount is 2%, after drying, calcining to obtain molecular sieve catalyst C2.

[0054] The catalyst activity evaluation was carried out on a fixed bed, the reaction conditions were 3 grams of catalyst mass, the reaction substrate was levulinic acid + water (50 / 50), and the weight space velocity was 1.0 hour. -1 , Hydrogen pressure 1.0MPa, flow rate 50ml min -1 , The temperature is 420℃. After the reaction, the conversion rate of levulinic acid was 99%, and the T60 was 1372 hours.

Embodiment 3

[0056] Weigh 30 grams of wood, place it in an autoclave and add 300 grams of ethanol, and then add a 5mol / L sulfuric acid solution with 7% water mass, heat up to 200°C and react for 30 minutes, then cool, and filter the cooled reaction solution , Obtain filter cake and filtrate, the filtrate is a cellulose hydrolysate. After the reaction, mass spectrometry is used to identify the main product of the reaction result as levulinic acid, and its production amount is 10.5 grams.

[0057] Weigh 35 grams of ZSM-5 with a silicon-to-aluminum ratio of 150 and 35 grams of pseudo-boehmite to mix, add 2.7 grams of Sesbania powder, and mix well. After that, 48 grams of nitric acid aqueous solution with a mass percentage of nitric acid of 5.5% was added, kneaded and shaped, and Ga(NO 3 ) 2 , The added amount of Ga is 1% of molecular sieve mass, extruded. The obtained catalyst precursor was dried at 120°C for 8 hours and calcined at 500°C for 2 hours to obtain a molecular sieve catalyst C3.

[00...

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Abstract

The invention relates to an aromatization method. The method includes the step of contacting a raw material with a catalyst in the presence of water under an aromatization reaction condition to manufacture aromatic hydrocarbon, wherein the raw material has a structural formula shown as (I), in the formula (I), R is optionally substituted C1-8 straight chain or branched alkyl, optionally substituted C2-8 straight chain or branched alkenyl; R2 is hydrogen, optionally substituted C1-10 straight chain or branched alkyl, and n is a positive integer of 1-6. The catalyst is a molecular sieve composition, which comprises the following components: a) 20-80 parts by weight of a molecular sieve, which is at least one of a ZSM type molecular sieve, a Y type molecular sieve, a Beta type molecular sieve, an L type molecular sieve or MCM type molecular sieve; b) 20-80 parts by weight of a binder; and c) 0.01-10 parts by weight of an assistant.

Description

Technical field [0001] The invention relates to a method for aromatization, in particular to a method for producing BTX aromatic hydrocarbons. The present invention further relates to a method for producing p-xylene and terephthalic acid based on the method for producing aromatic hydrocarbons. Background technique [0002] Aromatic products are widely used in many fields such as polyester, chemical fiber, rubber, medicine, and fine chemicals. The domestic consumption is considerable and has an important impact on the development of the national economy. At the same time, it is an important basic organic chemical raw material for social development. Benzene, toluene, and xylene are the three widely used aromatic chemicals in aromatics, collectively referred to as light aromatics or BTX aromatics. Benzene is a multi-purpose basic petrochemical raw material that can produce many products derived from it, including ethylbenzene / styrene, cumene / phenol and so on. Paraxylene is mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/207C07C15/04C07C15/06C07C15/08B01J29/40B01J29/46B01J29/48B01J29/70B01J29/14B01J29/12B01J29/08B01J29/78B01J29/04C07C51/16C07C63/26
CPCY02P20/52
Inventor 宋奇孔德金郑均林
Owner CHINA PETROLEUM & CHEM CORP
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