Dense phase fluidized bed reactor to maximize btx production yield

Pending Publication Date: 2022-08-11
SABIC GLOBAL TECH BV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new method for producing aromatics (such as BTX) from naphtha through catalytic cracking in a fluidized bed reactor. This method has several technical advantages such as maximizing production of BTX, increasing the ratio of BTX to light olefins, and improving BTX production efficiency. The method uses a fluidized bed reactor with a solids volume fraction of 0.35 to 0.45 and a high contact time between naphtha and the catalyst through a high superficial gas velocity of 0.25 to 0.5 m / s. The feed naphtha and the catalyst are fed counter-currently, which further enhances the contact between them and increases BTX production efficiency. Additionally, the method uses an internal structure in the fluidized bed reactor that breaks bubbles formed during the catalytic cracking process, leading to more effective contact between naphtha and the catalyst. Overall, this method provides a better solution to the problems associated with conventional methods for producing aromatics.

Problems solved by technology

Furthermore, the method includes feeding naphtha at a superficial gas velocity in the fluidized bed reactor of 0.25 to 0.5 m / s, resulting in high contact time between the naphtha and the catalyst and wide residence time distribution.

Method used

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  • Dense phase fluidized bed reactor to maximize btx production yield
  • Dense phase fluidized bed reactor to maximize btx production yield

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example

[0039](Catalytic Cracking of Naphtha in a Dense Phase Fluidized Bed Reactor)

[0040]A naphtha feed was catalytically cracked in a dense phase fluidized bed reactor. The naphtha feed included 23.15 wt. % normal paraffin, 28.07 wt. % iso-paraffin, 33.83 wt. % naphthenic species, 11.7 wt. % aromatics, 0.28 wt. % olefins, and 2.96 wt. % other heavier oligomeric hydrocarbon species. The reaction conditions for the catalytic cracking included a reaction temperature of 680° C., a regenerating temperature of 700° C., and weight hourly space velocity of 1.9 hr−1. The dense phase fluidized bed reactor had a catalyst load of 1500 g. The product yields (calculated based on mass; wt. %) at on-stream time of 0.5 hour, 1 hour, 2 hours, and 3 hours are shown in Table 1.

TABLE 1Product yieldsTime on stream (hour)0.5123CH49.509.599.439.86C2H66.946.696.516.77C2H412.6712.4412.3112.84C3H83.803.283.133.21C3H69.409.439.359.64C4H100.940.750.720.74C4H85.204.504.474.73C5+18.0417.8017.8917.76Benzene10.6612.0612....

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Abstract

Systems and methods for producing aromatics are disclosed. A mixture of hydrocarbons having an initial boiling point of less than 250° C. with catalyst in a fluidized bed under reaction conditions effective to produce one or more aromatics. The reaction conditions include an average solids volume fraction of the fluidized bed in a range of 0.35 to 0.45.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority of U.S. Provisional Patent Application No. 62 / 881,238 filed Jul. 31, 2019, which is hereby incorporated by reference in its entirety.FIELD OF INVENTION[0002]The present invention generally relates to systems and methods for producing aromatics. More specifically, the present invention relates to systems and methods of maximizing the production of benzene, toluene, and xylene via catalytic cracking of naphtha in a dense phase fluidized bed reactor.BACKGROUND OF THE INVENTION[0003]BTX (benzene, toluene, and xylene) are a group aromatics that are used in many different areas of the chemical industry, especially the plastic and polymer sectors. For instance, benzene is a precursor for producing polystyrene, phenolic resins, polycarbonate, and nylon. Toluene is used for producing polyurethane and as a gasoline component. Xylene is feedstock for producing polyester fibers and phthalic anhydride. I...

Claims

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Application Information

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IPC IPC(8): C10G11/18
CPCC10G11/182C10G2300/104C10G2300/1044C10G2400/20C10G2300/70C10G2300/308C10G2300/4006C10G2300/4012C10G2300/4018C10G2400/30C10G11/16
InventorALDUGMAN, TALAL ABDULLAHUEHARA, ERNESTOYE, MAOPENG, XIEAL-SHAMMARI, TALAL KHALED
OwnerSABIC GLOBAL TECH BV