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Mixed solvent for extractive distillation and separation of C4

A technology of mixed solvents and extractive distillation, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of increasing energy consumption in the separation process, large extraction dosage, etc., to reduce the number of extraction and rectification trays, and reduce the solvent ratio , the effect of reducing the distillation temperature

Inactive Publication Date: 2012-02-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the NMP method for extracting butadiene is that the added extraction dose is relatively large, which increases the energy consumption of the separation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A mixed solvent for extracting and rectifying separation of carbon four components, the main components of which are: NMP 90 (mass) %, water 7 (mass) %, NaSCN 3 (mass) %.

Embodiment 2

[0014] A mixed solvent for extracting and rectifying separation of carbon four components, the main components of which are: NMP 95 (mass) %, water 4 (mass) %, KSCN 1 (mass) %.

Embodiment 3

[0016] A comparative experiment was carried out. On the gas-liquid phase equilibrium device, the mixed solvent and pure NMP solvent in Example 1 were respectively used to measure n-butane, 1-butene, trans-2-butene, cis The relative volatility of -2-butene to 1,3-butadiene, the results are shown in the table below:

[0017] NMP

[0018] It can be seen from the data in the above table that the mixed solvent increases the relative volatility between the components.

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PUM

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Abstract

The invention provides a mixed solvent which can improve relative volatility among each ingredient of C4 and improve solvent selectivity, manly comprising N-methyl pyrrolidone, inorganic salt and water. Using the mixed solvent disclosed herein can greatly reduce the solvent ratio, reduce the cost, reduce the temperature of the column bottom, and save material consumption and energy consumption.

Description

technical field [0001] The invention relates to a novel mixed solvent used for extracting and rectifying the separation of carbon four components, and a high-efficiency solvent used in the field of petrochemical industry. 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 extracted from the mixed C4 fraction produced by the ethylene cracking unit. This type of method is low in cost and has economic advantages. The advantage of extractive distillation is that it increases the relative volatility between the separated components, enabling the separation of difficult-to-separate substances. According to the different extractants used, the extraction methods can be divided into dimethylformamide (DMF) method, N-methylpyrrolidone (NMP) method and acetonitrile (ACN) method. Compared with DMF solve...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C11/16
Inventor 刘智信李东风程建民廖丽华李晓峰过良李琰
Owner CHINA PETROLEUM & CHEM CORP
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