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Device and method for preparing styrene through ethylbenzene dehydrogenation

A technology for ethylbenzene dehydrogenation to produce styrene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of difficulty in reducing the water ratio of the ethylbenzene dehydrogenation unit, and difficulty in increasing the production of styrene. The effect of a good technical effect

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a device for producing styrene by ethylbenzene dehydrogenation in order to solve the problems in the prior art that the water ratio of the ethylbenzene dehydrogenation unit is difficult to reduce and the production of styrene is difficult to increase when the outlet temperature of the steam superheater remains unchanged. and methods

Method used

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  • Device and method for preparing styrene through ethylbenzene dehydrogenation
  • Device and method for preparing styrene through ethylbenzene dehydrogenation
  • Device and method for preparing styrene through ethylbenzene dehydrogenation

Examples

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Effect test

Embodiment 1

[0053] A 120,000-ton / year ethylbenzene dehydrogenation to styrene plant adopts figure 2 In the process for preparing styrene by dehydrogenation of ethylbenzene, the raw material flow rate comprising ethylbenzene and water is 31 tons / hour, the temperature is 98° C., and the pressure is 98 kPaA. The raw material is heated to 250°C by the raw material heater, then enters the ethylbenzene superheater to exchange heat to 550°C, mixes with superheated steam from the steam superheater and enters the first dehydrogenation reactor (reaction temperature 625°C, pressure 58kPaA), to obtain the second One stream, the first stream is divided into two streams and enters the second dehydrogenation reactor (reaction temperature 625 ℃, pressure 44kPaA) after being heated by the intermediate product heater and the intermediate heat exchanger, wherein, the stream entering the intermediate product heater is the same as the first The mass ratio of the stream is 0.3. The steam flow rate entering t...

Embodiment 2

[0056] A 120,000-ton / year ethylbenzene dehydrogenation to styrene plant adopts figure 2 In the process for preparing styrene by dehydrogenation of ethylbenzene, the raw material flow rate comprising ethylbenzene and water is 31 tons / hour, the temperature is 98° C., and the pressure is 98 kPaA. The raw material is heated to 250°C by the raw material heater, then enters the ethylbenzene superheater to exchange heat to 550°C, mixes with superheated steam from the steam superheater and enters the first dehydrogenation reactor (reaction temperature 625°C, pressure 58kPaA), to obtain the second One stream, the first stream is divided into two streams and enters the second dehydrogenation reactor (reaction temperature 625 ℃, pressure 44kPaA) after being heated by the intermediate product heater and the intermediate heat exchanger, wherein, the stream entering the intermediate product heater is the same as the first The mass ratio of the stream is 0.1. The steam flow rate entering t...

Embodiment 3

[0059] A 120,000-ton / year ethylbenzene dehydrogenation to styrene plant adopts image 3In the process for preparing styrene by dehydrogenation of ethylbenzene, the raw material flow rate comprising ethylbenzene and water is 31 tons / hour, the temperature is 98° C., and the pressure is 98 kPaA. The raw material is divided into two streams, the flow rate of the ethylbenzene superheater is 24.8 tons / hour, and the temperature after heat exchange is 535°C; the flow rate of the raw material heater is 6.2 tons / hour, and the temperature after heating is 540°C. Mix with the superheated steam from the steam superheating furnace and enter the first dehydrogenation reactor (reaction temperature 625°C, pressure 58kPaA) to obtain the first stream, which is divided into two streams after being heated by the intermediate product heater and the intermediate heat exchanger. The second dehydrogenation reactor (reaction temperature 625° C., pressure 46 kPaA), wherein the mass ratio of the stream e...

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Abstract

The invention discloses a device for preparing styrene by ethylbenzene dehydrogenation. The device comprises an ethylbenzene superheater, a steam superheating device, a first dehydrogenation reactor, an intermediate heat exchanger, an intermediate product heating device, a second dehydrogenation reactor and at least one raw material heater, wherein the raw material heater is connected with the ethylbenzene superheater in parallel or in series and is used for heating raw materials. A feedstock comprising ethylbenzene and water is passed into an ethylbenzene superheater and at least one feedstock heater to be heated. By adopting the method that the raw material heating device and the ethylbenzene superheater are connected in series and in parallel, the temperature of the raw material can be increased from 500-520 DEG C to 520-540 DEG C, and the intermediate product heating device can reduce the thermal load of the intermediate heat exchanger by 5-30%, so that enough heat can be provided for reaction without increasing the temperature of an outlet of the steam superheater, and the yield of the ethylbenzene is increased. The water ratio is reduced or the yield of styrene is increased.

Description

technical field [0001] The invention relates to a device and method for preparing styrene by dehydrogenating ethylbenzene, belonging to the field of chemical raw material production. Background technique [0002] Styrene is one of the most important basic organic chemical raw materials, used to manufacture polystyrene PS and EPS, ABS and SAN and other copolymer resins, styrene / butadiene copolymer latex SB, styrene-butadiene rubber and latex SBR, unsaturated Polyester and others such as styrene / methyl methacrylate latex, methyl methacrylate / butadiene / styrene copolymer MBS, ion exchange resins and drugs, etc. [0003] Industrially, the production technologies of ethylbenzene dehydrogenation to styrene include adiabatic dehydrogenation process, isothermal dehydrogenation process and dehydrogenation selective oxidation process. Among them, the most widely used and most mature technology is the negative pressure adiabatic dehydrogenation process of ethylbenzene. According to re...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C15/46
CPCC07C5/3332C07C15/46
Inventor 张凯刘文杰张洪宇
Owner CHINA PETROLEUM & CHEM CORP
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