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CHPPO alcohol injection crude separation system and crude separation method

A technology for rough separation and alcohol injection, which is applied in the field of rough separation systems to achieve the effects of enhancing separation efficiency, reducing losses and lowering the temperature of the tower kettle.

Pending Publication Date: 2021-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent only discloses the technical means of using extractant and 1,2-propanediol to form an azeotrope to purify and refine propylene oxide

Method used

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  • CHPPO alcohol injection crude separation system and crude separation method
  • CHPPO alcohol injection crude separation system and crude separation method
  • CHPPO alcohol injection crude separation system and crude separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Taking the CHPPO industrial device with a production scale of 50,000 tons / year as an example, the CHPPO alcohol injection rough separation system and the rough separation method of the present invention are used to divide the separation tower into double rectification separation towers, and the front tower is rectification tower A, The rear tower is recovery tower B. At the same time, an oil-water stratification tank C is set between the rectification tower A and the recovery tower B, and the oil phase of the stratification tank C and the water phase of the stratification tank C are sent to the rectification tower A and the recovery tower B respectively as reflux liquid to strengthen the rectification. In order to improve the separation efficiency of the distillation tower, an oil-water separation tank D, a water scrubber E, and an extractor F are set in the bottom of the recovery tower B, and water 24 and organic alcohol 18 are injected into the water scrubber E, and cu...

Embodiment 2

[0030] Same as Example 1, only the nominal capacity and process operation parameters are changed, the nominal capacity is changed to 150,000 tons / year CHPPO commercial industrial production device, and the process operation parameters are modified as follows: the operating pressure of the crude PO rectification tower is 0.21MPaA, the tower top The operating temperature is 63°C, the operating temperature of the tower kettle is 98°C; the operating pressure of the crude PO recovery tower is 0.13MPaA, the operating temperature of the top of the tower is 60°C, and the operating temperature of the tower kettle is 82°C; the operating pressure of the light removal tower G is 0.35 MPaA, the operating temperature at the top of the tower is 63°C, and the operating temperature at the bottom of the tower is 77°C; the operating pressure of the weight removal tower H is 0.22MPaA, the operating temperature at the top of the tower is 61°C, and the operating temperature at the bottom of the tower...

Embodiment 3

[0033] Same as Example 1, only the nominal capacity and process operation parameters are changed, the nominal capacity is changed to 300,000 tons / year CHPPO commercial industrial production device, and the process operation parameters are modified as follows: the operating pressure of the crude PO rectification tower is 0.21MPaA, the tower top The operating temperature is 63°C, the operating temperature of the tower kettle is 98°C; the operating pressure of the crude PO recovery tower is 0.15MPaA, the operating temperature of the top of the tower is 65°C, and the operating temperature of the tower kettle is 91°C; the operating pressure of the light removal tower G is 0.35 MPaA, the operating temperature at the top of the tower is 63°C, and the operating temperature at the bottom of the tower is 77°C; the operating pressure of the weight removal tower H is 0.22MPaA, the operating temperature at the top of the tower is 61°C, and the operating temperature at the bottom of the tower...

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Abstract

The invention discloses a CHPPO alcohol injection crude separation system and a crude separation method. The crude separation system comprises a rectification tower, a recovery tower, an oil-water layering tank, a light component removal tower, a heavy component removal tower, an oil-water separation tank, a water scrubber and an extractor. According to the crude separation method, a separation tower is divided into the rectification tower and the recovery tower, and water and organic alcohol are injected into a system, so that the recovery tower carries water and alcohol, wherein the mass ratio of water to alcohol Mw:Ma is 1.0: (0.4-4.8), the temperature of a tower kettle of the recovery tower is reduced from 150-210 DEG C to 70-110 DEG C, and the isopropylbenzene increment is reduced from 669-3392 wt% to 8.0-10.0 wt%. A small amount of benzyl alcohol and PO are recovered through the oil-water separation tank, the water scrubber and the extractor, so that the recovery rate of crude PO is increased from 99.74-99.94 wt% to 99.95-99.97 wt%, and the problems of high temperature of a crude PO tower kettle, large loss of isopropylbenzene and low recovery rate of crude PO are well solved.

Description

technical field [0001] The invention relates to a separation system and a separation method of a separation unit of a cumene oxidation CHPPO device, in particular to a crude separation of a CHPPO device that uses organic alcohol injection to reduce the temperature of the tower tank during the rectification and separation process of the crude propylene oxide PO tower System and coarse separation method. Background technique [0002] Propylene oxide is one of the important intermediates of petrochemical industry and one of the three derivative products of polypropylene, propylene oxide and acrylonitrile in the propylene series. It is widely used in the production of polyether polyols to prepare polyurethane plastics, and is also used in the production Unsaturated resins and surfactants have a profound impact on the development of the chemical industry and the national economy. At present, nearly a hundred kinds of downstream products have been produced from propylene oxide, m...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D3/42B01D17/032B01D11/04C07D301/32C07D303/04C07C29/74C07C33/20
CPCB01D3/14B01D3/42B01D17/0214B01D11/0492B01D11/0484C07D301/32C07D303/04C07C29/74C07C33/20
Inventor 孙丽丽白玫何琨
Owner CHINA PETROLEUM & CHEM CORP