A method for preparing ethylbenzene from alkylation tail gas after catalytic dry gas is used to prepare styrene

A styrene and dry gas technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as unavailability, and achieve the effects of low cost, low reaction temperature and strong recyclability

Active Publication Date: 2015-09-30
陕西延长石油(集团)有限责任公司炼化公司
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for producing ethylbenzene from the alkylation tail gas after the catalytic dry gas is used to produce styrene, to overcome the problem in the prior art that ethylbenzene cannot be produced from ethane in the catalytic dry gas, and finally make the catalytic dry gas of ethane is also fully utilized

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  • A method for preparing ethylbenzene from alkylation tail gas after catalytic dry gas is used to prepare styrene

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Embodiment 1

[0049] The present embodiment 1 provides a kind of such as figure 1 Shown a kind of method that ethylbenzene is produced by the alkylation tail gas after catalyzed dry gas system styrene, comprises the following steps:

[0050] 1) Hydrocarbonized tail gas 11 is pressurized to 1.7MPa by compressor and then enters the bottom of absorption tower 1; at the same time, benzene at 10°C is used as absorbent to enter the top of absorption tower 1; alkylated tail gas 11 and benzene cross-flow in absorption tower 1 After the contact, the tail gas is discharged from the top of the absorption tower 1, and the bottom liquid is benzene rich in ethane;

[0051] The tower top temperature 10 ℃ of described absorption tower 1, the tower bottom temperature 18 ℃ of absorption tower 1; Pressure 1.7MPa;

[0052] 2) The ethane-rich benzene is pumped into the desorption tower 2 for desorption;

[0053] The pressure inside the analysis tower 2 is 1.0MPa, the temperature at the top of the analysis to...

Embodiment 2

[0078] This embodiment provides a figure 1 Shown a kind of method that ethylbenzene is produced by the alkylation tail gas after catalyzed dry gas system styrene, comprises the following steps:

[0079] 1) Hydrocarbonized tail gas 11 is pressurized to 2.8 MPa by the compressor and then enters the bottom of absorption tower 1; at the same time, benzene at 14°C is used as absorbent to enter the top of absorption tower 1; alkylated tail gas 11 and benzene cross-flow in absorption tower 1 After the contact, the tail gas is discharged from the top of the absorption tower 1, and the bottom liquid is benzene rich in ethane;

[0080] The tower top temperature 20 ℃ of described absorption tower 1, the tower bottom temperature 25 ℃ of absorption tower 1; Pressure 2.8MPa;

[0081] 2) The ethane-rich benzene is pumped into the desorption tower 2 for desorption;

[0082] The pressure inside the analysis tower 2 is 1.5MPa, the temperature at the top of the analysis tower 2 is 30°C, and t...

Embodiment 3

[0107] This embodiment provides a figure 1 Shown a kind of method that ethylbenzene is produced by the alkylation tail gas after catalyzed dry gas system styrene, comprises the following steps:

[0108] 1) The hydrocarbonized tail gas is pressurized by the compressor to 2.0MPa and then enters the bottom of the absorption tower 1; at the same time, benzene at 12°C is used as the absorbent to enter the top of the absorption tower 1; after the cross-flow contact between the hydrocarbonated tail gas and benzene in the absorption tower 1 , the tail gas is discharged from the top of the absorption tower 1, and the bottom liquid is benzene rich in ethane;

[0109] The tower top temperature 12 ℃ of described absorption tower 1, the tower bottom temperature 22 ℃ of absorption tower 1; Pressure 2.0MPa;

[0110] 2) The ethane-rich benzene is pumped into the desorption tower 2 for desorption;

[0111] The pressure inside the analysis tower 2 is 1.2MPa, the temperature at the top of the...

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Abstract

The invention belongs to the technical field of preparation of ethyl benzene through catalytic dry gas, and discloses a preparation method of ethyl benzene by adopting alkylation exhaust gas generated in the process of preparing styrene by adopting catalytic dry gas. The method comprises the following steps: separating ethane, demethanizing, deethanizing, performing oxidative dehydrogenation, dehydrating and depickling, performing hydrocarbylation reaction, and separating ethyl benzene. A preferred adsorbent and the cyclic utilization technology of ethane and the adsorbent can minimize the preparation cost of ethyl benzene, the technology is simple and the recyclability is high. Under appropriate technological conditions, the total conversion rate of ethane can reach above 88%, the overall selectivity of ethylene generating ethyl benzene can reach above 80%, the purity of ethyl benzene can reach above 83%, and the recovery rate of the adsorbent can reach above 99%.

Description

technical field [0001] The invention belongs to the technical field of preparing ethylbenzene with catalytic dry gas, and in particular relates to a method for preparing ethylbenzene from the alkylation tail gas after the catalytic dry gas is used to prepare styrene. Background technique [0002] The dry gas produced by the refinery mainly includes catalytic cracking dry gas, coking dry gas, reforming dry gas, hydrocracking dry gas, and non-condensable gas from atmospheric and vacuum devices. 4% to 8% of the mass fraction of the feed to the catalytic device), and the volume fraction of ethylene and ethane contained is high, which is of great utilization value. However, at present, the catalytic dry gas of my country's refining and chemical enterprises is usually sent to the refinery gas pipeline network and burned as industrial fuel, and some are even burned in the flare system, which is a great waste of resources. [0003] With the development of the global economy, intern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C2/66C07C9/06C07C7/11C07C11/04C07C5/48
Inventor 罗万明金德浩王军峰李鸿雄张秋芳王荣斌李志刚李军张浩文刘锋吴小园李佳杜娟莉王广汉寇延鹏
Owner 陕西延长石油(集团)有限责任公司炼化公司
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