Thermosensitive material intermittent rectifying process having side material output and tower kettle cold material storage

A rectification process and side-line technology, applied in the field of batch rectification process of heat-sensitive materials, can solve the problems of difficult to achieve, decompose, low yield and other problems with ordinary rectification technology, and achieve short rectification time, low thermal decomposition rate, high yield effect

Inactive Publication Date: 2004-12-22
TIANJIN UNIV
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Problems solved by technology

Batch rectification is a commonly used separation technology in the separation of fine chemicals. Ordinary batch rectification is to put materials into the tower kettle and extract products and transition sections from the top of the tower. However, for high-purity products, ordinary batch rectification often yields Low rate and high energy consumption
There are many kinds of fine chemicals, many of which are heat-sensitive and will decompose when heated, and it is difficult to achieve high purity with ordinary distillation techniques

Method used

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  • Thermosensitive material intermittent rectifying process having side material output and tower kettle cold material storage

Examples

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Embodiment 1

[0015] Example 1: The raw material is 91% (mass percentage) dimethylbenzyl orthoacetate. Take appropriate batch of raw material liquid into the tower kettle, turn on the canned motor pump, evaporator, cooler and condenser to start the distillation tower, adjust the flow rate of the cooling water of the cooler, so that the temperature of the material liquid in the tower kettle is not higher than 50℃ . Volatile impurities are concentrated at the top of the tower and extracted from the top of the tower. When the material concentration at the sideline outlet reaches 99.5% (mass percentage), the finished product is extracted from the sideline outlet. When the concentration of distillate at the top outlet reaches When 99.5% (mass percentage), the product is extracted from the top of the tower and the side line at the same time. With the rectification, when the product content of the side line outlet is less than 99% (mass percentage), the side line discharging is stopped, and the materi...

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Abstract

An intermittent rectifying system with side discharge and cold storage of material on top for the thermosensitive material is composed of cold storaging tower still, rectifying tower with side discharging, condenser, cooler, shielding pump and evaporator. The thermosensitive material is stored in cold state. Its advantages are short rectifying time, low thermodecomposing rate of raw material, and high purity and output rate of product.

Description

Technical field [0001] The invention relates to a heat-sensitive material batch distillation process with side-line discharging and cold storage of tower kettle. It belongs to the non-traditional batch distillation technology that obtains high-purity products from heat-sensitive materials through rectification. Background technique [0002] With the development of the fine chemical industry, people have higher and higher requirements for the purity of fine chemicals, and the technology for obtaining high-purity chemicals is generally valued by enterprises. Intermittent distillation is a commonly used separation technology in the separation of fine chemicals. Ordinary intermittent distillation involves putting materials into the tower and extracting products and transition sections from the top of the tower. However, for high-purity products, ordinary intermittent distillation is often Low rate and high energy consumption. There are many varieties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14
Inventor 崔现宝杨志才
Owner TIANJIN UNIV
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