Crude styrene tower top heat recovery method and device

A technology of heat recovery device and styrene tower, which is applied in the chemical industry, climate sustainability, organic chemistry, etc., can solve the problems of limited application value, large investment, and high power consumption of compressors, so as to avoid the risk of styrene polymerization, The effect of reducing equipment investment, saving investment and energy consumption

Inactive Publication Date: 2015-09-02
SHANDONG QILU PETROCHEM ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This solution requires a large investment and high power consumption of the compressor, which limits its application value especially for large styrene plants.

Method used

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  • Crude styrene tower top heat recovery method and device

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with accompanying drawing:

[0030] Such as figure 1 Shown, the crude styrene overhead heat recovery method of the present invention, comprises the steps:

[0031] a. The dehydrogenation liquid enters the crude styrene tower, and the gas phase stream containing benzene, toluene and ethylbenzene is obtained at the top of the tower, and the gas phase stream enters the tower top condenser. After heating the heat pump working fluid stream, most of the gas phase stream is condensed, and the uncondensed Part of the gas phase stream is further cooled by the aftercooler, part of the condensate of the gas phase stream is used as crude styrene top reflux, and part of it is sent to the ethylbenzene recovery tower;

[0032] b. The vaporized working substance stream enters the compressor, and after being compressed and heated, it is used to heat the ethylbenzene / water azeotrope;

[0033] c. After the ethylbenzene...

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Abstract

The invention is mainly applied to the technical field of crude styrene tower top heat recovery, and particularly relates to a crude styrene tower top heat recovery method which comprises the following steps: a. a dehydrogenation solution enters a crude styrene tower to obtain a gas-phase stream containing benzene, toluene and ethylbenzene on the tower top, the gas-phase stream enters a tower top condenser to heat a heat pump working medium stream, most of the gas-phase stream is condensed, and the uncondensed gas-phase stream is further cooled by an after cooler, and the gas-phase stream physical distribution is partially used as a crude styrene tower top reflux and partially sent into an ethylbenzene recovery tower; b. the vaporized working medium stream enters a compressor, and is used for heating an ethylbenzene/water azeotrope after being compressed and heated; and c. the ethylbenzene/water azeotrope is vaporized and enters an ethylbenzene superheater, and meanwhile, the water vapor is condensed into a water vapor condensate. The method thoroughly solves the problem that the traditional heat pump technique can heat the tower bottom material only by greatly enhancing the compression ratio of the compressor, saves the investment and energy consumption, and makes the application of the heat pump technique possible.

Description

technical field [0001] The invention relates to a crude styrene tower top heat recovery method and device, which are mainly used in the technical field of crude styrene tower top heat recovery. Background technique [0002] Styrene monomer is an important basic organic chemical raw material, widely used in the production of polystyrene (PS), expanded polystyrene (EPS), ABS and SAN resins, in addition to the production of ion exchange resins, agricultural emulsifiers, pharmaceuticals It is the main basic product of petrochemical industry and an important organic chemical raw material. It is the fourth largest ethylene derivative product after PE, PVC and EO. Its output is second only to PE and PVC among synthetic resins. third. [0003] Most of styrene is obtained through the dehydrogenation process of ethylbenzene, and its process technologies mainly include adiabatic dehydrogenation process, isothermal dehydrogenation process and oxidative dehydrogenation process. One of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C15/073C07C7/04
CPCY02P20/10Y02P20/50
Inventor 丛林郭东荣邱若磐宋守刚刘善兵
Owner SHANDONG QILU PETROCHEM ENG
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