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Method for Reducing Energy Consumption of Oxidation Unit of Propylene Oxide Plant

A technology of propylene oxide and energy consumption, which is applied in the field of reducing the energy consumption of the oxidation unit of the propylene oxide device, can solve the problem of high energy consumption, achieve good technical effects, and reduce the power consumption of the device

Active Publication Date: 2016-09-07
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of high energy consumption in the prior art, and a new method for reducing the energy consumption of the oxidation unit of the propylene oxide plant is provided

Method used

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  • Method for Reducing Energy Consumption of Oxidation Unit of Propylene Oxide Plant

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The production scale of propylene oxide is 100,000 tons / year, and two oxidation towers are installed. The operating temperature of the oxidation tower 201 is 110°C; the operating pressure is 0.30MPaG; the operating temperature of the cooler 301 is 110°C; the operating pressure is 0.30MPaG; the operating temperature of the oxidation tower 202 is 105°C; the operating pressure is 0.20MPaG; The operating pressure is 0.20MPaG; there is no circulating pump on the circulating liquid circulation pipeline, and the natural circulation is realized by relying on the density difference between the gas-liquid two-phase flow in the oxidation tower and the liquid phase flow in the circulation pipeline. The density difference between the gas-liquid two-phase flow in the oxidation tower and the liquid-phase flow in the circulation pipeline is 7.5. 70% of the liquid phase flow at the top of the oxidation tower is directly returned to the bottom of the oxidation tower through the circulati...

Embodiment 2

[0024] According to the conditions and steps described in Example 1, the production scale of propylene oxide becomes 150,000 tons / year, and three oxidation reactors are set. The operating temperature of the oxidation tower 201 is 110°C; the operating pressure is 0.30MPaG; the operating temperature of the cooler 301 is 110°C; the operating pressure is 0.30MPaG; the operating temperature of the oxidation tower 202 is 108°C; the operating pressure is 0.25MPaG; The operating pressure is 0.25MPaG; the operating temperature of the oxidation tower 203 is 105°C; the operating pressure is 0.20MPaG; the operating temperature of the cooler 303 is 105°C; the operating pressure is 0.20MPaG; The density difference of the stream is 7.5. 70% of the liquid phase flow at the top of the oxidation tower is directly returned to the bottom of the oxidation tower through the circulation line after passing through the cooler. Reduce electricity consumption by 1.0904 million kwh / year.

Embodiment 3

[0026] According to the conditions and steps described in Example 1, the production scale of propylene oxide is 100,000 tons / year, and two oxidation reactors are installed, but the operating conditions are changed. The operating temperature of the oxidation tower 201 is 120°C; the operating pressure is 0.35MPaG; the operating temperature of the cooler 301 is 120°C; the operating pressure is 0.35MPaG; the operating temperature of the oxidation tower 202 is 105°C; the operating pressure is 0.20MPaG; The operating pressure is 0.20 MPaG; the density difference between the gas-liquid two-phase flow in the oxidation tower and the liquid-phase flow in the circulation pipeline is 8.8. 64% of the liquid phase stream at the top of the oxidation tower is directly returned to the bottom of the oxidation tower through the circulation line after passing through the cooler. Reduce electricity consumption by 737,200 kWh / year.

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Abstract

The invention relates to a method for reducing energy consumption of an oxidation unit of an epoxy propane device and mainly solves the problem of high energy consumption in the prior art. The method comprises the following steps: a raw material of isopropyl benzene enters an oxidation tower to be in contact with air for oxidation reaction to generate a material flow comprising cumyl hydroperoxide; one part of a liquid phase material flow at the top of the oxidation tower passes through a cooler and then directly returns back to the bottom of the oxidation tower through a circulation pipeline, and the other part of the liquid phase material flow enters the next level of oxidation tower or the next section; wherein a circulating pump is not arranged on the circulation pipeline, but natural circulation is realized through the density difference of gas-liquid phase material flows in the oxidation tower and the liquid phase material flow in the circulation pipeline. The method can be used in epoxy propane production.

Description

technical field [0001] The invention relates to a method for reducing energy consumption of an oxidation unit of a propylene oxide plant. Background technique [0002] Propylene oxide is one of the important intermediates of petrochemical products, and is widely used in the production of polyether polyols to prepare polyurethane plastics, as well as the production of unsaturated resins and surfactants. At present, the production technologies of propylene oxide mainly include: chlorohydrin method, propylene oxide / styrene co-production, propylene oxide / tert-butanol co-production, cumene hydrogen peroxide oxidation and other indirect oxidation methods and hydrogen peroxide direct ring oxidation method. [0003] CN201210429266.9 and CN 201110294224.4 relate to the method for producing propylene oxide, have described the process method of producing propylene oxide by cumene method, this method first is to obtain cumene hydroperoxide CHP by oxidation of cumene, and then peroxide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/19
CPCC07D301/19
Inventor 杨建平许麟君牛晓锋何琨
Owner SINOPEC SHANGHAI ENG
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