Unlock instant, AI-driven research and patent intelligence for your innovation.

How to separate btx

A separation method and a technology of a dividing wall rectifying tower are applied in the field of energy-saving processes, which can solve problems such as high energy consumption, and achieve the effects of improving utilization efficiency, realizing high coupling, and reducing heat consumption.

Active Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the high energy consumption problem in the BTX separation process in the traditional aromatics process. The present invention proposes a BTX separation method. Compared with the traditional process, this method has the following advantages while realizing efficient separation of products : (1) Combining the benzene tower and toluene tower in the traditional process into a rectification tower with double partitions not only saves investment, but also realizes high heat coupling and improves heat utilization efficiency; (2) according to Separation requires adjusting the position of the transverse partition and installing a reboiler in the tower to realize the optimal utilization of heat; (3) After pressurizing the steam at the top of the tower to increase the calorific value grade, it can provide heat for the tower kettle and reduce the heat of the tower kettle consume

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
  • How to separate btx
  • How to separate btx
  • How to separate btx

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Combine below figure 1 Example 1 will be described.

[0034] Such as figure 1 Shown, a kind of device of BTX separation method, it comprises the rectifying column T of double dividing wall on the left side 1 and the energy saving system on the right. The BTX mixed aromatics feed (S1) from the aromatics extraction unit is fed into the tower from the middle part of the II zone of the dividing wall tower. Its composition is shown in Table 1, and the feed flow rate is 8633kg / h. Zone II is the pre-fractionation section, the number of theoretical plates in Zone II is 26, and the feeding position is the 13th plate. Almost all of the benzene and part of the toluene in the feed of the II zone enter the I zone from the top of the II zone, and the number of theoretical plates in the I zone is 20, and the pressure at the top of the tower is

[0035] 140KPa, the temperature at the top of the tower is 91°C, the role of zone I is the purification of benzene products, the top gas (...

Embodiment 2

[0042] Combine below figure 1 Example 2 will be described.

[0043] Such as figure 1 Shown, a kind of device of BTX separation method, it comprises the rectifying column T of double dividing wall on the left side 1 And the energy saving system on the right. The BTX mixed aromatics feed (S1) from the aromatics extraction unit is fed into the tower from the middle part of the II zone of the dividing wall tower. Its composition is shown in Table 2, and the feed flow rate is 8633kg / h. Zone II is the pre-fractionation section, the number of theoretical plates in Zone II is 30, and the feed position is the 15th plate. Almost all of the benzene and part of the toluene in the feed of zone II enter zone I from the top of zone II. The number of theoretical plates in zone I is 25, the pressure at the top of the tower is 200KPa, and the temperature at the top of the tower is 104°C. The role of zone I is to purify benzene products , the top gas (S2) is extracted from the top of zone I,...

Embodiment 3

[0050] Combine below figure 1 Example 3 will be described.

[0051] Such as figure 1 Shown, a kind of device of BTX separation method, it comprises the rectifying column T of double dividing wall on the left side 1 And the energy saving system on the right. The BTX mixed aromatics feed (S1) from the aromatics extraction unit is fed into the tower from the middle part of the II zone of the dividing wall tower. Its composition is shown in Table 3, and the feed flow rate is 8633kg / h. Zone II is the pre-fractionation section, the number of theoretical plates in Zone II is 15, and the feeding position is the seventh plate. Almost all of the benzene and part of the toluene in the feed to Zone II enter Zone I from the top of Zone II. The number of theoretical plates in Zone I is 10, the pressure at the top of the tower is normal pressure, and the temperature at the top of the tower is 80°C. The role of Zone I is to produce benzene. Purification, the tower top gas (S2) is extracte...

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 a method for separating BTX in aromatics process. According to the method, the following devices are related to: a double-partition dividing-wall rectifying tower, a vapor compressor set, an interstage liquid separate pot, a column reactor heat exchanger, a column reactor reboiler, an in-reactor reboiler, a pressure control system, a condenser, a return tank and a reflux pump. Compared with the BTX separation process in the conventional aromatics process, the BTX separation method has the following advantages: (1), a benzene tower and a toluene tower in the conventional process are combined into the rectifying tower provided with double partitions, so that not only is the investment reduced, but also highly thermal coupling is realized, and the heat utilization efficiency is improved; (2), as the positions of the horizontal partitions are regulated according to separation requirements, and the in-reactor reboiler is arranged, the optimal heat utilization is realized; (3), the overhead vapor is pressurized to improve the heat grade, so that heat can be provided for the column reactor, and the heat consumption of the column reactor can also be reduced.

Description

technical field [0001] The invention relates to a method for separating BTX, in particular to an energy-saving process for separating BTX in an aromatics process. Background technique [0002] Benzene, toluene, and xylene are important organic chemical raw materials. A series of compounds produced by benzene (B) through substitution reactions, addition reactions, and oxidation reactions can be used to prepare plastics, rubber, fibers, dyes, detergents, Insecticides, etc.; a series of intermediates derived from toluene (T) are widely used in the production of fine chemicals such as dyes, medicines, pesticides, explosives, auxiliaries, spices, etc., and are also used in the synthetic material industry; xylene (X ) is an important raw material in the polyester industry, and has a wide range of uses in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. [0003] Since our country has a large population and little land,...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C15/04C07C15/06C07C15/08
CPCY02P20/10Y02P20/50
Inventor 曹君杨卫胜贺来宾
Owner CHINA PETROLEUM & CHEM CORP