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Method for separating out and purifying epoxypropane and methyl alcohol

A technology of propylene oxide and methanol, applied in chemical instruments and methods, preparation of organic compounds, water/sludge/sewage treatment, etc., can solve the problems of high operating pressure and temperature, achieve low production cost, simple production process, The effect of making full use of material energy

Active Publication Date: 2013-06-12
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, the invention patents on the purification of propylene oxide that have been disclosed at home and abroad are all related to the production of propylene oxide, and the purpose is to improve the yield of crude propylene oxide in the production process. Distillation method, operating pressure and temperature are higher

Method used

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  • Method for separating out and purifying epoxypropane and methyl alcohol
  • Method for separating out and purifying epoxypropane and methyl alcohol
  • Method for separating out and purifying epoxypropane and methyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]1) The washing mother liquor M1 shown in Table 1 is fed from the 23rd plate above the first rectification tower T1 tower still, and rectification is carried out with the first rectification tower T1, from the top of the first rectification tower Obtain the tower top material that contains propylene oxide crude product, obtain methyl alcohol at the 4th tray place above the tower still of the first rectifying tower T1 tower still side line;

[0025] Table 1, composition of washing mother liquor M1

[0026] components

[0027] The washing mother liquor shown in Table 1 is the mother liquor obtained by polymerization of propylene oxide and carbon dioxide under the condition of a rare earth three-way catalyst, coagulation washing with methanol, and solid-liquid separation;

[0028] In this rectification step, the operating pressure of the tower is 60kPa, the number of theoretical plates is 30, the temperature at the top of the tower is 21.0°C, the temperature at the...

Embodiment 2

[0039] 1) The washing mother liquor M2 shown in table 4 is fed from the 23rd tray above the first rectification tower T1 tower still, and rectification is carried out with this first rectification tower T1, from the top of the first rectification tower Obtain the tower top material that contains propylene oxide crude product, obtain methyl alcohol at the 6th tray place above the tower still of the first rectifying tower T1 tower still side line;

[0040] Table 4, Polypropylene carbonate production mother liquor M2 composition

[0041] components

[0042] Methanol

[0043] The washing mother liquor shown in Table 4 is the mother liquor obtained by polymerization of propylene oxide and carbon dioxide under the condition of a rare earth three-way catalyst, coagulation washing with methanol, and solid-liquid separation;

[0044] In this rectifying step, the operating pressure of the tower is 50KPa, the number of theoretical plates is 30, the temperature at the ...

Embodiment 3

[0055] 1) The washing mother liquor M2 shown in Table 7 is fed from the 13th tray above the first rectifying tower T1 tower still, and rectified with the first rectifying tower T1, and the Obtain the tower top material that contains propylene oxide crude product, obtain methanol at the 7th plate above the tower still of the first rectifying tower T1 tower still side line;

[0056] Table 7, composition of mother liquor M2 for producing polypropylene carbonate

[0057] components

[0058] The washing mother liquor shown in Table 7 is the mother liquor obtained by polymerization of propylene oxide and carbon dioxide under the condition of a rare earth three-way catalyst, coagulation washing with methanol, and solid-liquid separation;

[0059] In this rectifying step, the operating pressure of the tower is 30kPa, the number of theoretical plates is 25, the temperature at the top of the tower is 4.4°C, the temperature at the bottom of the tower is 50.0°C, and the temperat...

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Abstract

The invention discloses a method for separating out and purifying epoxypropane and methyl alcohol. The method comprises the following steps: 1) rectifying washing mother liquor which contains the epoxypropane and methyl alcohol and is used for producing aliphatic polycarbonate in a first rectifying tower so as to obtain tower top material containing crude epoxypropane from the tower top of the first rectifying tower and obtain the methyl alcohol from a tower plate at the tower kettle side line of the first rectifying tower; and 2) rectifying the tower top material containing the crude epoxypropane in a second rectifying tower so as to obtain the epoxypropane from the tower plate of the tower kettle or tower kettle side line of the second rectifying tower. In the invention, a double-tower efficient rectification mode is adopted, namely, vacuum or normal pressure rectification is used in the first tower, and high pressure rectification is used in the second tower, thereby extremely effectively separating out two target substances epoxypropane and methyl alcohol, obtaining high-purity epoxypropane and methyl alcohol materials, reducing by-products and fully utilizing material energy,and the industrial process reaches the requirement of green chemistry.

Description

technical field [0001] The invention relates to a method for separating and purifying propylene oxide and methanol. Background technique [0002] Carbon dioxide is the main gas responsible for the greenhouse effect and one of the most abundant sources of carbon on Earth. The chemical fixation of carbon dioxide is an important research field of green chemistry. Among them, one of the main directions of utilizing carbon dioxide is to prepare aliphatic polycarbonate by copolymerizing it with alkylene oxide under the action of a catalyst. Aliphatic polycarbonate can be photodegraded or biodegraded, and also has excellent oxygen and water barrier properties, and can be used as degradable non-polluting materials, disposable pharmaceutical and food packaging materials, adhesives, and composite materials. [0003] Since Japan Inous discovered that carbon dioxide can be fixed into a fully biodegradable polymer in 1969, there have been many patent reports on the preparation of aliph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/06C07C31/04C07C29/80C02F9/10
Inventor 陈步宁徐建波李文辉陈科宇刘立文王国忠蔡日新张昕照阳彩霞陈亚凯丁纲意向辉
Owner CHINA NAT OFFSHORE OIL CORP
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