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Method for extracting butadiene from dimethylfomamide and mixture thereof

A technology of dimethylformamide and butadiene, which is applied in organic chemistry, distillation purification/separation, etc., can solve the problems of reduced operating cycle of the device, poor solvent selectivity, and high operating temperature, so as to reduce equipment investment and operating costs, The effect of reducing the number of theoretical plates and solvent ratio and increasing relative volatility

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high boiling point of DMF (153°C), when it is applied to the extractive distillation process, the temperature of the extractive distillation column and the desorption column is relatively high, and a large amount of high-temperature steam is required as a heat source, resulting in high energy consumption.
In addition, due to the high temperature in the bottom of the tower, diolefins are easy to polymerize, the trays are easy to block, and the operating cycle of the device is reduced.
[0005] The extraction of butadiene by DMF method has the problems of poor solvent selectivity, high operating temperature and high process energy consumption.

Method used

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  • Method for extracting butadiene from dimethylfomamide and mixture thereof
  • Method for extracting butadiene from dimethylfomamide and mixture thereof
  • Method for extracting butadiene from dimethylfomamide and mixture thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 shown, including the following steps:

[0039] (1) The first extractive distillation: raw material mixed C4 fraction 9 (main composition: n-butane 4.0%, isobutane 1.1%, 1-butene 11.0%, isobutene 24.8%, 1,3-butadiene 48.1% , ethyl acetylene 0.8%, vinyl acetylene 0.4%) inject the first extractive distillation tower 1, mixed solvent 10 adds from tower top, the plate number of the first extractive distillation tower is 85, at tower top temperature 41 ℃, Under the operating conditions of tower kettle temperature of 115°C, pressure of 0.37MPa, reflux ratio of 1.0, and mixed solvent to C4 feed weight ratio of 5.8, insoluble components such as butane and butene are extracted from the top of the tower as raffinate 11 , the mass content of butadiene in the raffinate is 32ppm, and the rich solvent dissolved with butadiene and alkynes is extracted from the tower kettle and sent to the first stripper 2;

[0040] The rich solvent enters the first stripping tower 2,...

Embodiment 2

[0053] (1) The first extractive distillation: raw material mixed C4 fraction 9 (main composition: n-butane 4.0%, isobutane 1.1%, 1-butene 11.0%, isobutene 24.8%, 1,3-butadiene 48.1% , ethyl acetylene 0.8%, vinyl acetylene 0.4%) inject the first extractive distillation tower 1, mixed solvent 10 adds from tower top, the plate number of the first extractive distillation tower is 85, at tower top temperature 41 ℃, Under the operating conditions of tower kettle temperature 102°C, pressure 0.37MPa, reflux ratio 1.1, mixed solvent to C4 feed weight ratio of 6.2, insoluble components such as butane and butene are extracted from the top of the tower as raffinate 11 , the mass content of butadiene in the raffinate is 30ppm, and the rich solvent dissolved with butadiene and alkynes is extracted from the tower kettle and sent to the first stripper 2;

[0054] The rich solvent enters the first stripping tower 2, the number of plates of the first stripping tower is 12, the operating conditi...

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Abstract

The invention discloses a method for extracting butadiene from dimethylfomamide and a mixture thereof. The dimethylfomamide and the mixture thereof consist of dimethylfomamide and a low-boiling-point solvent, wherein the content of the dimethylfomamide is 50-99 percent by weight; the low-boiling-point solvent is a solvent of which the boiling point is lower than that of the dimethylfomamide and is 50-153 DEG C, and is preferably one or more of acetonitrile, butanone and acetone; and the dimethylfomamide and the mixture thereof are taken as extracting agents of butadiene in the method. The method comprises a first extractive distillation step, a second extractive distillation step, a refining step and the like. Due to the adoption of the method disclosed by the invention, the selectivity of the solvent can be increased, the tower plate number and the solvent ratio of an extractive distillation tower can be greatly lowered, and the equipment investment and the operating cost are lowered.

Description

technical field [0001] The invention relates to the field of organic chemical industry, and furthermore, relates to a method for extracting butadiene by using dimethylformamide and a mixture thereof. Background technique [0002] Butadiene is an important petrochemical basic organic raw material and synthetic rubber monomer, and is one of the most important components in the C4 fraction. At present, butadiene in the world is mainly obtained by extractive distillation (also known as extraction), which is low in cost and has economic advantages. [0003] Dimethylformamide (DMF) is an efficient extractive distillation solvent, which has been used to separate butadiene for a long time. In order to further improve the separation ability of DMF, it is generally modified by adding other substances in DMF. [0004] Due to the high boiling point of DMF (153°C), when it is applied to the extractive distillation process, the temperature of the extractive distillation column and the d...

Claims

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Application Information

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IPC IPC(8): C07C11/16C07C11/167C07C7/08
Inventor 程建民刘智信李东风廖丽华过良李琰李晓峰罗淑娟
Owner CHINA PETROLEUM & CHEM CORP
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