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A double-tower continuous feeding rectification system and control method

A control method and material supply technology, applied in the direction of distillation adjustment/control, fractionation, organic chemistry, etc., can solve the problems that the feeding process cannot be guaranteed to be continuous, safe, efficient, separation efficiency cannot be guaranteed, and the batching system is unreasonable, etc., to achieve Improve the efficiency of separation and purification, improve the purity of the product, and the effect of continuous feeding process

Active Publication Date: 2021-07-06
TIANE CHEM FIBER GROUP CORP BAODING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the existing problems in the prior art are: the existing rectification system or device raw material batching system is unreasonable, the rectification efficiency is low, and the purity is not high; the control method of rectification cannot guarantee the continuous and safe feeding process , high efficiency, can not guarantee the separation efficiency

Method used

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  • A double-tower continuous feeding rectification system and control method
  • A double-tower continuous feeding rectification system and control method
  • A double-tower continuous feeding rectification system and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Embodiment 1 A kind of control method of double-tower continuous feeding rectification

[0074] This implementation case provides a kind of rectification purification process of chemical raw material butyrolactam, and its steps are as follows:

[0075] Step 1: Loading Control

[0076] Send the butyrolactam to be rectified to the 1# rectification tower, the purity is 83%, the moisture content is 14%, and the other impurity content is 3%, and the liquid level of the tower kettle is controlled to 90%.

[0077] Step 2: Initial distillation process control

[0078] Turn on the vacuum pump, adjust the emptying valve of the vacuum buffer tank, control the vacuum degree of the tower kettle to -80±1kpa, control the temperature of the tower kettle at 160±2℃, and keep the pressure difference of the tower top and tower kettle at 0.5±0.1kpa, and wait until the tower top temperature reaches At about 60±1°C, light components can be seen from the sight glass. When the temperature of ...

Embodiment 2

[0083] Embodiment 2 A kind of control method of two-tower continuous feeding rectification

[0084] This implementation case provides a kind of rectification purification process of chemical raw material butyrolactam, and its steps are as follows:

[0085] Step 1: Loading Control

[0086] Send the butyrolactam to be rectified to the 1# rectification tower, the purity is 90%, the moisture content is 8%, and the other impurity content is 2%, and the liquid level in the tower kettle is controlled to 80%.

[0087] Step 2: Initial distillation process control

[0088] Turn on the vacuum pump, adjust the emptying valve of the vacuum buffer tank, control the vacuum degree of the tower kettle to -70±1.5kpa, control the temperature of the tower kettle at 200±3℃, keep the pressure difference of the tower top and tower kettle at 1.5±0.2kpa, wait for the tower top temperature When it reaches about 70±1°C, light components can be seen from the sight glass. When the temperature of the dis...

Embodiment 3

[0093] Embodiment 3 A kind of control method of two-tower continuous feeding rectification

[0094] This implementation case provides a kind of rectification purification process of chemical raw material butyrolactam, and its steps are as follows:

[0095] Step 1: Loading Control

[0096] Send the butyrolactam to be rectified to the 1# rectification tower, the purity is 95%, the moisture content is 4%, the other impurity content is 1%, and the liquid level of the tower still is controlled to 60%.

[0097] Step 2: Initial distillation process control

[0098]Turn on the vacuum pump, adjust the emptying valve of the vacuum buffer tank, control the vacuum degree of the tower kettle to -50±1kpa, control the temperature of the tower kettle at 240±2℃, keep the pressure difference of the tower top and tower kettle at 1±0.2kpa, wait until the temperature of the tower top reaches At about 85±1°C, light components can be seen from the sight glass. When the temperature of the discharge...

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Abstract

The present invention provides a control method and system for rectification with continuous feeding of double towers, including: feeding control, initial distillation process control, material delivery control and fine rectification process control; controlling the pressure P of 1# rectification tower 1 and pressure difference ΔP 1 , heat up until the top temperature reaches T 1 , open the control valve of the outlet outlet at the top of the tower, and wait for the rate of temperature increase at the top of the 1# rectification tower to be ΔT 1 , the initial distillation process is completed; the fine distillation process is: control the pressure difference ΔP at the top of the 2# rectification tower tower 2， Slowly increase the temperature of the tower kettle and control the heating rate ΔT 2 , control the temperature of the tower kettle at T 2 , when the top temperature reaches T 3 , to complete the fine distillation process control. The control method of the present invention adopts four continuous control steps, which ensures the continuous, safe and efficient feeding process, and improves the separation and purification efficiency of the rectification system. The invention also provides a double-tower continuous feeding rectification system, which has a reasonable raw material batching system, high rectification efficiency and high product purity.

Description

technical field [0001] The invention belongs to the field of chemical equipment technology and distillation technology, and relates to a distillation control method and system, in particular to a control method and system for rectification with continuous feeding of double towers. Background technique [0002] Rectification is a distillation method that uses the different boiling points of the components in the mixture to separate the components to obtain high-purity isolates. It is the most widely used liquid mixture separation operation in industry and is widely used in petroleum, chemical, light Industry, food, metallurgy and other departments. [0003] Distillation operations are classified in different ways. According to the operation mode, it can be divided into continuous distillation and batch distillation; according to the number of components of the mixture, it can be divided into binary distillation and multi-component distillation; according to whether additives...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14B01D3/32B01D3/42C07D207/267
Inventor 赵鹏飞赵一甲姜珊王乐军王东兴郑宗强刘怡宁
Owner TIANE CHEM FIBER GROUP CORP BAODING
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