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Adiabatic flash method for styrene tar oil

An adiabatic flash evaporation, styrene technology, applied in chemical instruments and methods, organic chemistry, hydrocarbon purification/separation, etc., can solve the problems of large loss of styrene, poor evaporation effect, high equipment investment, and achieve flash evaporation energy. The effect of improving, increasing liquidity, and reducing equipment investment

Inactive Publication Date: 2005-11-16
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the existing literature that does not involve the treatment of purified styrene towers and towers, or the current industrial installations are processed by membrane evaporators. To solve the problem of large loss of ethylene, provide a new method for adiabatic flash evaporation of styrene tar

Method used

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  • Adiabatic flash method for styrene tar oil
  • Adiabatic flash method for styrene tar oil

Examples

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Effect test

Embodiment 1

[0019] The material from the bottom of the crude styrene separation tower enters the styrene separation tower for separation, and the refined styrene product is separated at the top of the styrene separation tower. A mixture of 0.03 kg / hour of cumene, 103.38 kg / hour of α-methylstyrene, 141.03 kg / hour of heavy components and 136.78 kg / hour of polymer, wherein the weight percentage concentration of styrene is 54.47%, and the mixture is passed through The heat exchanger enters the middle of the flash tank for adiabatic flash evaporation. The temperature of the flash tank is 145°C and the pressure is 20KPa. After adiabatic flash evaporation, the material mainly containing styrene is flashed from the top of the flash tank and recycled into styrene separation. In the lower part of the tower, its mass flow composition is: 444.47 kg / h of styrene, 0.03 kg / h of cumene, 99.01 kg / h of α-methylstyrene, 75.24 kg / h of heavy components and 67.78 kg / h of polymer. The discharge at the bottom of...

Embodiment 2

[0021] According to the conditions and steps of embodiment 1, just changing the operating temperature of the flash tank is 120 ℃, and the operating pressure is 30KPa, and the amount of tar in the middle part of the flash tank is circulated by weight ratio: the tar amount discharged is 140: 1, then out The weight percent concentration of styrene in the material tar is 4.98%.

Embodiment 3

[0023] According to the conditions and steps of embodiment 1, just changing the operating temperature of the flash tank is 140 ℃, and the operating pressure is 15KPa, and the amount of tar in the middle part of the flash tank is circulated by weight ratio: the tar amount discharged is 130: 1, then out The weight percent concentration of styrene in the material tar is 3.69%.

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Abstract

The present invention relates to a styrene tar adiabatic flash method, and is aimed at mainly resolving the problems of that the utilization of existent industrial equipment membrane evaporator is high in equipment investment and is easy to be damage, its evaporation effect is poor and styrene loss is high. Said invention adopts the technical scheme of that the tower bottoms produced after separation of tyrene separation tower can be fed into adiabatic flash tank, the adiabatic temp. of the flash tank is 120-150 deg.C and its pressure is 10-30 KPa, after adiabatic flash evaporation the top material of the flash tank can be circularly fed into styrene separation tower and the bottom tar can be partially circulated, so as to better resolve said problems. Said method can be used in industrial production of the styrene.

Description

technical field [0001] The invention relates to a method for adiabatic flash evaporation of styrene tar. Background technique [0002] Styrene is widely used as a raw material for the production of various resins, plastics and elastomers, and its wide range of applications is mainly due to the ease with which styrene can be polymerized (for example, to form polystyrene) or copolymerized (for example, with butadiene to form Production of rubber) adaptability. [0003] The production of styrene is well known in terms of the dehydrogenation process and the various catalysts used in the process. The main research objective at present is to improve the efficiency of this process. Especially known is the dehydrogenation process of ethylbenzene, wherein the dehydrogenation is carried out in a set comprising at least two dehydrogenation reactors in series and placed between the reactors, wherein the reaction effluent is heat exchanged with steam hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C13/18
CPCC07C7/00C07C15/46
Inventor 邵百祥朱冬茂张忠群毛连生
Owner CHINA PETROLEUM & CHEM CORP
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