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Gas separation device and method based on front and rear depropanization double-tower process

A front depropanizer and rear depropanizer technology, which is applied in the purification/separation of hydrocarbons, chemical instruments and methods, climate sustainability, etc., can solve the problems of low thermal energy level, high energy consumption, and high thermal energy level. The effect of reducing the thermal energy level

Inactive Publication Date: 2017-03-15
DALIAN UNIV OF TECH +1
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Problems solved by technology

[0005] Aiming at the problems of high thermal energy grade and high energy consumption in conventional gas separation devices, the present invention proposes a new energy-saving rectification device and method with low thermal energy grade

Method used

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  • Gas separation device and method based on front and rear depropanization double-tower process
  • Gas separation device and method based on front and rear depropanization double-tower process
  • Gas separation device and method based on front and rear depropanization double-tower process

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Embodiment

[0026]Taking a certain gas separation device as an example, the process described in the present invention is adopted. Feed amount is 50000kg / h, feed composition: ethane 0.2%wt%, propane 11.5%wt%, propylene 41.3%wt%, n-butane 6.3%wt%, isobutane 13.6%wt%, n-butene 3.4% wt%, 1-butene 13.5% wt%, cis-2-butene 4.6% wt%, trans-2-butene 5.6% wt%. The theoretical plate number of the front depropanizer is 65, the feeding position is the 25th plate, the operating pressure is 1.7MPag, the output of the top of the front depropanizer is 17000kg / h, and the C3 content of the produced product is controlled above 99.6%wt% ; The output at the bottom of the front depropanizer is 33000kg / h, and the C4 content of the extracted product is controlled above 71.2%wt%. The theoretical plate number of the deethanizer is 47, the feeding position is the 19th plate, the operating pressure is 2.65MPag, the output of the deethanizer is 251kg / h, and the carbon dioxide content of the produced product is contr...

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Abstract

The invention discloses a gas separation device and method based on a front and rear depropanization double-tower process, and belongs to the field of petroleum chemical industry gas separation. Front and rear depropanization double towers are adopted for replacing a depropanization tower in a conventional process, the front depropanization tower adopts non-clear division for separation of C3 and C4, and a heat source of a tower bottom reboiler is 90-110 DEG C hot water; the rear depropanization tower adopts clear division for separation of C3 and C4, and a heat source of a tower bottom reboiler is 0.35 MPag steam; during operation in winter, the rear depropanization tower can perform pressure reduction operation, and the tower bottom reboiler can adopts 90-110 DEG C hot water as a heat source. Compared with the conventional process, in the premise of ensuring a separation index, the heat energy level can be reduced and energy saving and efficiency improvement of the device can be achieved.

Description

technical field [0001] The invention belongs to the field of petrochemical gas separation, and relates to a gas separation device and method based on a front and back depropanization double-tower process. Specifically, on the basis of the conventional gas separation process, the depropanizer is changed to a double-tower process. Among them, the front depropanizer adopts non-clear separation, the overhead distillate contains ethane and some propane, propylene, and the kettle liquid contains C3 and C4, and then the depropanizer clearly divides C3 and C4. At the same time, it is guaranteed that the deethanizer and propylene rectification tower have the same separation effect as the original process. In addition, under the condition that the top distillates of the front and rear depropanizers can be condensed and cooled by circulating water, the temperature at the bottom of the tower is lowered due to the unclear division of the front depropanizer, and the heat source used by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C11/06
CPCC07C7/005C07C7/04C07C11/06Y02P20/10
Inventor 董宏光栾波韩志忠王耀圩郑李斌张凤岐朱炜玄崔宪峰
Owner DALIAN UNIV OF TECH
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