Apparatus and method for separating styrene from hydrocarbons mixture

A hydrocarbon mixture, styrene technology, applied in the purification/separation of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of long separation process, high energy consumption, high process energy consumption, and reduce equipment investment. , the effect of reducing heat load and reducing energy consumption

Inactive Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to separate and obtain styrene with a purity of more than 99.5%, the theoretical plate of the rectification column must exceed 150, and the reflux ratio must be greater than 100, which cannot be realized in practical applications.
CN101723793A discloses a method for separating crude styrene from pyrolysis gasoline by using a dividing wall tower, but there is a problem that the product purity is not high and further separation is required
The process is a traditional two-t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus and method for separating styrene from hydrocarbons mixture
  • Apparatus and method for separating styrene from hydrocarbons mixture
  • Apparatus and method for separating styrene from hydrocarbons mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Based on a styrene plant with a production capacity of 150,000 tons / year, a dividing wall extractive distillation column is used to separate styrene from hydrocarbon mixtures. The structure and device flow of the dividing wall distillation column are as follows figure 1 shown. The ratio of the cross-sectional area of ​​the extractive distillation section to the cross-sectional area of ​​the solvent recovery section in the extractive distillation column is 1.5:1, and the height ratio of the common rectification section, the extractive distillation section and the common stripping section is 35:45: 10. After installing the trays, the number of theoretical plates in the common rectification section is 35; the number of theoretical plates in the extractive distillation section is 45; the number of theoretical plates in the solvent recovery section is 25; The inlet position of the mixed hydrocarbon raw material is set on the 10th plate from top to bottom in the extractive d...

Embodiment 2

[0042] Adopt the device and method among the embodiment 1 from pyrolysis gasoline C 8 Styrene is recovered in the distillate, the difference is: the ratio of the cross-sectional area of ​​the extractive rectification section in the extractive distillation tower to the cross-sectional area of ​​the solvent recovery section is 1.7:1, and the common rectification section, the extractive rectification section and the common The height ratio of the stripping section is 30:35:20. After installing the trays, there are 30 theoretical plates in the extraction and rectification section, 25 theoretical plates in the solvent recovery section, 30 theoretical plates in the public rectification section, 20 theoretical plates in the public stripping section, and a top reflux ratio of 2.5 , the side line reflux ratio is 1.8, and other conditions are the same as before. Under the conditions of controlling the purity of styrene to 99.7wt% and the recovery rate to 95wt%, the results of extractiv...

Embodiment 3

[0044] Adopt the device and method among the embodiment 1 from pyrolysis gasoline C 8 Styrene is recovered in the distillate, the difference is: the ratio of the cross-sectional area of ​​the extractive rectification section in the extractive distillation column to the cross-sectional area of ​​the solvent recovery section is 1.8:1, the common rectification section, the extractive rectification section and the common The height ratio of the stripping section is 25:40:20. After installing the trays, there are 25 theoretical plates in the public rectification section, 40 theoretical plates in the extractive distillation section, 20 theoretical plates in the public stripping section, 30 theoretical plates in the solvent recovery section, and a top reflux ratio of 1.2 , the side line reflux ratio is 1.5, the mass ratio of composite solvent / raw material is 5, and all the other conditions are the same as in Example 2. Under the conditions of controlling the purity of styrene to 99....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an apparatus and a method for separating styrene from a hydrocarbons mixture. The apparatus comprises an extraction rectifying tower provided with a separation wall, a tower top condenser and a tower top product buffer tank communicated with discharging at tower top, a lateral line condenser and a lateral line product buffer tank communicated with discharging at lateral line, and a reboiler, the separation wall is positioned at central section of the rectifying tower along the axial direction, a top with a closure cap is connected with the side tower wall, the inner part of the extraction rectifying tower is divided into a common rectifying section (1), an extraction rectifying section (2), a common stripping section (4) and a solvent recovery section (3) in order, an inlet for mixing the hydrocarbons raw material is arranged at the extraction rectifying section (2), a solvent inlet is arranged at the bottom of the common rectifying section (1), and the lateral line product outlet is arranged at the upper part of the solvent recovery section (3). The apparatus and method have the advantages that the styrene separation efficiency is high, the apparatus investment is reduced, and the energy consumption is reduced.

Description

technical field [0001] The present invention relates to a kind of hydrocarbon mixture separation device and method, more particularly, relate to a kind of device and method for recovering styrene from hydrocarbon mixture by extractive distillation. Background technique [0002] Styrene monomer is an important basic organic chemical raw material, and it is also widely used in coatings, pesticides, and medicine. According to statistics, the by-product steam cracking gasoline of ethylene cracking unit contains 3-5% styrene. The traditional processing method is for pyrolysis gasoline C 6 -C 8 The distillate undergoes two-stage hydrogenation, in which styrene is saturated into ethylbenzene, which not only causes the concentration of ethylbenzene in the mixed xylene to be too high to be used as isomerization grade xylene, but also wastes a lot of hydrogen resources. In contrast, the direct separation of styrene from pyrolysis gasoline is an attractive technology. However, due ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C15/46C07C7/08C07C7/00
Inventor 高思亮田龙胜唐文成赵明
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap