Negative pressure adiabatic flash tank and adiabatic flash vaporizaiton method for tar phenylethylene recovery

An adiabatic flash evaporation and negative pressure technology, which is applied in flash evaporation, distillation purification/separation, organic chemistry, etc., and can solve problems such as pressure drop loss

Inactive Publication Date: 2004-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] One of the technical problems to be solved by the present invention is that the conventional negative pressure adiabatic flash tank adopts a circular section side wall feed nozzle, which cannot make the flash feed

Method used

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  • Negative pressure adiabatic flash tank and adiabatic flash vaporizaiton method for tar phenylethylene recovery
  • Negative pressure adiabatic flash tank and adiabatic flash vaporizaiton method for tar phenylethylene recovery
  • Negative pressure adiabatic flash tank and adiabatic flash vaporizaiton method for tar phenylethylene recovery

Examples

Experimental program
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Effect test

Embodiment 1

[0057] In a 100,000-ton / year styrene plant, the tar styrene recovery adopts the sidewall horizontal feed adiabatic flash tank with a flat oblong fan-shaped nozzle of the present invention.

[0058] Figure 8 It is the front view and top view of the adiabatic flash tank. In the figure, the inner diameter of the flash tank Di = 1.1 meters; the height of the tangent line H = 2.8 meters; the height of the tangent line from the center line of the feed port to the upper head h = 1.8 meters; the nominal diameter of the feed pipe d 1 DN300; Nominal diameter of tank top gas outlet pipe d 2 DN300; the nominal diameter of the tar outlet pipe at the bottom of the tank d 3 It is DN125; the central angle of the fan-shaped nozzle is α=60°; the length of the oblong nozzle 1=0.5Di=0.55 meters; the width of the oblong nozzle b=0.14 meters.

[0059] The operating pressure of the adiabatic flash tank is 20KPaA; the operating temperature is 146°C. The styrene concentration of the kettle liquid from th...

Embodiment 2

[0062] According to the conditions of Example 1, only the type of the horizontal feed nozzle on the side wall of the adiabatic flash tank was changed. Instead of using the fan-shaped nozzle with a flat oblong mouth of the present invention, it will Figure 8 The feed pipe with a nominal diameter of DN300 is directly inserted horizontally into the side wall of the flash tank (e.g. Figure 5 with Figure 6 Shown), used as a feed nozzle.

[0063] The result of the adiabatic flashing operation is: the styrene concentration in the discharged tar is 8% (weight); the tar discharge is 3.5 tons per day; the styrene loss due to the tar discharge is 0.88 kg / ton of styrene product, which is higher than the design value 0.79 kg / ton of styrene products.

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Abstract

The present invention relates to a negative-pressure adiabatic flash tank and adiabatic flash method for recovering tar styrene. Said invention is characterized by that it adopts the following measures: removing in-tank vapor-liquid separation member, adopting sector prolate mouth feeding sprayer and optimizing flash tank diameter and in-tank vapor-liquid separation space height, under the condition of 15-25 KPaA and 120-150 deg.C operating negative-pressure adiabatic flash tank, two-phase flow feeding rate at spraying hole place is 10-20 m/sec. and in-tank vaporized gas apparent life velocity is 0.9-1.4 m/sec.

Description

Technical field [0001] The invention relates to a negative pressure adiabatic flash tank and an adiabatic flash method for recovery of tar styrene. Specifically, it relates to a negative pressure adiabatic flash tank and an adiabatic flash method for recovery of tar styrene in styrene production. Background technique [0002] Styrene monomer (SM) is an important chemical raw material product, and it is the fourth largest ethylene derivative product after PE, PVC, and EO. The output of styrene series resins ranks third only after PE and PVC in synthetic resins. [0003] The process routes of styrene production mainly include ethylbenzene catalytic dehydrogenation process and ethylbenzene co-oxidation co-production process of styrene / propylene oxide, the former accounting for about 90% of styrene production capacity. The process of catalytic dehydrogenation of ethylbenzene to styrene has many methods such as Monsanto / Lummus, Fina / Badger and so on. Alt...

Claims

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Application Information

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IPC IPC(8): B01D3/06C07C7/04C07C15/46
Inventor 崔世纯邵百祥何志毛连生
Owner CHINA PETROLEUM & CHEM CORP
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