Mixed xylene deolefination refining device and method

A technology for removing olefins from xylene and mixing xylenes, applied in chemical instruments and methods, purification/separation of hydrocarbons and hydrocarbons, etc., can solve the problems of frequent switching of pipelines, affecting product quality, etc. , Extend the service cycle, and improve the effect of comprehensive benefits

A technology for removing olefins from xylene and mixing xylenes, applied in chemical instruments and methods, purification/separation of hydrocarbons and hydrocarbons, etc., can solve the problems of frequent switching of pipelines, affecting product quality, etc. , Extend the service cycle, and improve the effect of comprehensive benefits

CN106565400AActive Publication Date: 2017-04-19CHINA PETROLEUM & CHEM CORP
4 Cites 1 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mixed xylene deolefination refining device and method
  • Mixed xylene deolefination refining device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The reformed oil fraction first enters the pre-refining tank 1, at reaction temperature: 100-140°C, reaction pressure: 0.6MPa, volume space velocity: 1.0h -1 Under certain conditions, after removing part of the olefins, enter the mixed xylene fractionation tower 2 for fractionation, and draw out the mixed C8 cut from the side line above the first tray from the top to the bottom of the mixed xylene fractionation tower 2, and pass through the feed heat exchanger 4 After cooling down, enter the refining tank 3, at reaction temperature: 100-140°C, reaction pressure: 0.6MPa, volumetric space velocity: 1.0h -1 Under the conditions, after removing olefins, return to the mixed xylene fractionation tower 2 on the 6th tray from top to bottom after the centrifugal pump 6 and the discharge heat exchanger 5 heat up, and the top of the tower outputs the mixed xylene product, Polymer with tower kettle C9 + Heavy components are discharged.

Embodiment 2

[0026] The reformed oil fraction first enters the pre-refining tank 1, at reaction temperature: 120-160°C, reaction pressure: 0.8MPa, volume space velocity: 0.5h -1 Under certain conditions, after removing part of the olefins, enter the mixed xylene fractionation tower 2 for fractionation, and draw out the mixed C8 fraction from the top of the fifth tray from the top to bottom of the mixed xylene fractionation tower 2, and pass through the feed heat exchanger 4 After cooling down, enter the refining tank 3, at reaction temperature: 120-160°C, reaction pressure: 0.8MPa, volumetric space velocity: 2.5h -1 Under the conditions, after removing olefins, return to the mixed xylene fractionation tower 2 on the 10th tray from top to bottom after the centrifugal pump 6 and the discharge heat exchanger 5 heat up, and the mixed xylene product is produced at the top of the tower. Polymer with tower kettle C9 + Heavy components are discharged.

Embodiment 3

[0028] The reformed oil fraction first enters the pre-refining tank 1, at the reaction temperature: 140-180°C, reaction pressure: 0.7MPa, volume space velocity: 0.7h -1 Under certain conditions, after removing part of the olefins, enter the mixed xylene fractionation tower 2 for fractionation, from the mixed xylene fractionation tower 2 from the top to the bottom of the second plate, the side line draws out the mixed C8 fraction, and passes through the feed heat exchanger 4 After cooling down, enter the refining tank 3, at reaction temperature: 140-180°C, reaction pressure: 1.0MPa, volumetric space velocity: 3.0h -1 Under the conditions, after removing olefins, return to the mixed xylene fractionation tower 2 on the 7th tray from top to bottom after the centrifugal pump 6 and the discharge heat exchanger 5 heat up, and the top of the tower outputs the mixed xylene product, Polymer with tower kettle C9 + Heavy components are discharged.

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

PropertyMeasurementUnit
densityaaaaaaaaaa
relative humidityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a mixed xylene deolefination refining device and method. The device comprises a pre-refining tank, a mixed xylene fractionation column, a refining tank, a feeding heat exchanger, a discharging heat exchanger and a centrifugal pump. A C8 fraction is withdrawn from the side line above some column plate in 1-5 column plates counted from the top of the mixed xylene fractionation column downwards and used for feeding of the top of the refining tank, and tank bottom discharging returns from the side line above some column plate in 6-10 column plates counted from the top of the mixed xylene fractionation column downwards; and the top of the refining tank is at the 5-column-plate distance from the withdrawing position of the side line of the mixed xylene fractionation column, and the bottom of the refining tank is at the 5-column-plate distance from the return position of the side line of the mixed xylene fractionation column, mixed xylene products are produced from the top of the column, and polymers are discharged along with column reactor C9+ heavy components. By the adoption of the mixed xylene deolefination refining device and method, the purpose that the polymers can be separated without additionally arranging a separation column or other equipment and the qualified mixed xylene products are obtained is achieved; the service cycle of a catalyst can be prolonged, the cost is lowered, and high-quality chemical raw materials are obtained; and the good comprehensive benefits are obtained.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a device and method for refining mixed xylene deolefins. Background technique [0002] The mixed xylene product is one of the important chemical basic products, which is obtained from the reforming product oil fractionation tower of the continuous reforming unit. The oil produced by catalytic reforming is rich in aromatics and solvent oil fractions, but also contains a small amount of olefins. These olefins are active and easy to form colloids; the presence of olefins will also affect some subsequent processing processes such as extraction of aromatics. In order to produce qualified aromatics and solvent oil products, olefins must be removed. At present, the widely used deolefin refining unit in industry adopts hydrogenation and granular clay process for removal. The precious metals used in hydrorefining are expensive, and the presulfurization of catalysts will generate s...

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
19 Apr 2017
Publication
CN106565400A
IPC
C07C7/00; C07C7/04; C07C7/12; C07C7/13; C07C15/08
CPC
C07C7/005; C07C7/04; C07C7/12; C07C7/13; C07C15/08
Inventors
冯保杰; 程建