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Method of modifying zeolite catalyst

A zeolite catalyst and zeolite technology are applied in the direction of catalysts, molecular sieve catalysts, carbon compound catalysts, etc., and can solve problems such as technical obstacles to toluene methylation

Inactive Publication Date: 2005-12-07
SAUDI BASIC IND CORP SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Unfortunately, there are many technical hurdles to successful large-scale methylation of toluene, so improvements are needed

Method used

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  • Method of modifying zeolite catalyst
  • Method of modifying zeolite catalyst
  • Method of modifying zeolite catalyst

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Experimental program
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Embodiment 1～19

[0057] Catalysts A-I, J-O and P-S described above and in Tables 1-3 are all used in the methylation reaction of toluene. The reactions are all carried out in fixed-bed, continuous-flow reactors. In each case, the catalyst was passed through hydrogen (H 2 Drying was carried out by slowly raising the catalyst bed temperature (about 5°C / min) to 200°C under air flow for at least 1 hr. A premixed toluene and methanol feed (2 / 1 molar ratio) was added to the 200°C reactor and the catalyst bed inlet temperature was increased to about 500°C. Liquid hourly space velocity (LHSV) (based on toluene / methanol feed) is maintained at about 31hr -1 , fed into H 2 gas co-feed and maintain H 2 The / HC molar ratio is about 0.1. Water is added to the hydrocarbon (HC) feed, which is vaporized before entering the reactor. h 2 The O / HC molar ratio was about 0.65 and the reactor pressure was about 20 Psig. At a run time of about 3-4 hrs, liquid product was collected and analyzed. The results a...

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Abstract

A method of modifying a zeolite catalyst to increase para-xylene selectivity of the zeolite catalyst in toluene methylation reactions is provided. The method includes forming a slurry of a ZSM-5-type zeolite and an aqueous solution of a phosphorus compound. Water is removed from the slurry to provide a non-steamed, phosphorus treated ZSM-5 zeolite catalyst without deposition of phosphorus onto the catalyst by organophosphorus vapor deposition. The resulting non-steamed, phosphorus treated ZSM-5 zeolite catalyst has a pore volume of from 0.2 ml / g or less and provides greater than 80% para-xylene selectivity of mixed xylenes when used in toluene methylation.

Description

technical field [0001] This invention relates generally to the alkylation of aromatic compounds and catalysts for such reactions. Background technique [0002] Para-xylene is a valuable substituted aromatic compound because it is in high demand for the production of terephthalic acid, the main component that forms polyester fibers and resins. It can be produced on a large scale from hydrotreating (catalytic reforming) of naphtha, steam cracking of naphtha or gasoline, and disproportionation of toluene. [0003] Alkylation of toluene with methanol, also known as toluene methylation, has been used in laboratory research to produce paraxylene. Toluene methylation is known to occur over acidic catalysts, especially zeolites or zeolite-type catalysts. Specifically, ZSM-5-type zeolites, zeolite beta and silicoaluminophosphate (SAPO) catalysts have been used in this process. In general, self-methylation of toluene can form a thermodynamic equilibrium mixtu...

Claims

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Application Information

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IPC IPC(8): B01J27/16B01J29/40C07C2/86
CPCC07C2/864B01J29/40C07C2529/40B01J2229/12B01J2229/37Y02P20/52C07C15/08E03C1/29E03C2201/60
Inventor A·K·戈霍斯G·朱特图P·哈维N·库卡尼
Owner SAUDI BASIC IND CORP SA