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Negative pressure adiabatic flash tank and adiabatic flash method for tar styrene recovery

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

Inactive Publication Date: 2005-02-02
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 material cover the entire cross section of the flash tank and the vapor / liquid in the flash tank Separation components will cause a certain pressure drop loss, and a new negative pressure adiabatic flash tank is provided

Method used

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  • Negative pressure adiabatic flash tank and adiabatic flash method for tar styrene recovery
  • Negative pressure adiabatic flash tank and adiabatic flash method for tar styrene recovery
  • Negative pressure adiabatic flash tank and adiabatic flash method for tar styrene recovery

Examples

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Embodiment 1

[0057] A certain 100,000 tons / year styrene plant, its tar styrene recovery adopts the side wall horizontal feed adiabatic flash tank with flat oblong fan nozzle of the present invention.

[0058] Figure 8 are the front and top views 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 inlet to the upper head h = 1.8 meters; the nominal diameter of the feed pipe d 1 It is DN300; the nominal diameter of the gas outlet pipe on the top of the tank is d 2 It is DN300; the nominal diameter of the tar outlet pipe at the bottom of the tank is d 3 It is DN125; the central angle α=60° of the fan-shaped nozzle; the length 1=0.5Di=0.55 meters of the oblong nozzle; the width b=0.14 meter of the oblong nozzle.

[0059] The operating pressure of the adiabatic flash tank is 20KPaA; the operating temperature is 146°C. The styrene conce...

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. Do not adopt the fan nozzle with flat oblong mouth of the present invention, but will Figure 8 The feed pipe with a nominal diameter of DN300 is directly inserted into the side wall of the flash tank (such as Figure 5 and Figure 6 shown), used as the feed nozzle.

[0063] The result of the adiabatic flash operation is: the concentration of styrene in the discharged tar is 8% (weight); the discharge of tar is 3.5 tons per day; the amount of styrene lost with the discharge of tar 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 tar styrene recovery. Specifically, it relates to a negative pressure adiabatic flash tank and an adiabatic flash method for recovering 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 in synthetic resins after PE and PVC. [0003] The process routes for styrene production mainly include ethylbenzene catalytic dehydrogenation process and ethylbenzene co-oxidation co-production styrene / propylene oxide process. The former accounts for about 90% of the styrene production capacity. There are Monsanto / Lummus, Fina / Badger and other processes for the catalytic dehydrogenation of ethylbenzene to styrene. Although these pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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