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Method for separating nitroethane and 2-nitropropane by combined process of continuous side distillation and extractive distillation

A technology for nitroethane and nitropropane, which is applied in the field of continuous side-line rectification and extractive rectification integrated separation of nitroethane and 2-nitropropane, can solve the problem that the yield can only reach 53% and the operation process is complicated. , many middle distillates and other problems, to achieve the effect of reduced energy consumption, high separation efficiency and huge potential

Inactive Publication Date: 2011-10-19
江苏沿江化工资源开发研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the separation of nitroethane and 2-nitropropane mixtures generally adopts multiple distillations to obtain a single fraction. Due to the small difference in boiling point between the low-carbon nitroalkane components, the properties of the components are shown in Table 1, especially the nitroalkane The difference between the boiling points of ethyl ethane and 2-nitropropane is the smallest, and distillation is used for separation. Not only is the operation process complicated, difficult to control, and the product purity is low, but there are too many middle distillates, and the yield can only reach 53%.

Method used

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  • Method for separating nitroethane and 2-nitropropane by combined process of continuous side distillation and extractive distillation
  • Method for separating nitroethane and 2-nitropropane by combined process of continuous side distillation and extractive distillation
  • Method for separating nitroethane and 2-nitropropane by combined process of continuous side distillation and extractive distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Continuous side rectification and extractive distillation integrated separation method for nitroethane and 2-nitropropane, refer to figure 1 Shown technology and parameter shown in table 2, the mass percent compositions of nitromethane, nitroethane, 2-nitropropane and 1-nitropropane in the mixed nitroalkane of raw material ① are respectively 13.46%, 82.35%, 4.16% and 0.03%, the flow rate is 10Kg / h.

[0028] The inner diameter of each tower is 57cm, and the φ3×3θ stainless steel packing is used. The equal plate height of the packing is HETP=27mm as measured by the standard system. Feedstock and individual fractions were analyzed quantitatively and qualitatively.

[0029] The separation method includes the following steps:

[0030] (1) Raw materials mixed with nitroalkanes ① put into the continuous side stream rectification column, the tower tank is heated by the resistance wire controlled by the pressure regulator, the feed rate is controlled at 10Kg / h, and the dischar...

Embodiment 2

[0038] Example 2 is basically the same as Example 1, but the mass ratio of the extraction agent in the (2) step to the raw material feed to the extractive distillation column is 1:0.8.

Embodiment 3

[0039] Example 3 is basically the same as Example 1, but the mass ratio of the extraction agent in the (2) step to the raw material feed to the extractive distillation column is 1:1.2.

[0040] The method of the present invention is not limited by the above-mentioned specific devices and process parameters. Those skilled in the art can adjust the relevant parameters or implement corresponding changes or transformations within the scope of the present invention according to the process conditions; Scale up accordingly.

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Abstract

Disclosed is a method for separating nitroethane and 2-nitropropane by a combined process of continuous side distillation and extractive distillation. The method comprises the following steps: (1) adding mixed nitroparaffin1 containing 80% to 85% of nitroethane into a continuous side distillation tower so as to obtain a fraction 2 with a boiling range of 105.0 to 106.5 DEG C, a fraction 3 with a boiling range of 116.2 to 117.7 DEG C and a fraction 4 with a boiling range of 123.4 to 125.7 DEG C, wherein the content of nitroethane in the fraction 3 is over 95.5%; (2) allowing the fraction 3 to enter into an extractive distillation tower so as to obtain a fraction 5 containing over 99.4% of nitroethane in the top of the tower and a fraction 6 containing an extracting solvent and 2-nitropropane in the bottom of the tower; (3) treating the fraction 6 in a solvent recovery column and allowing the obtained extracting solvent in the column bottom to flow into the extractive distillation tower for cyclic utilization. According to the invention, the combined process of continuous side distillation and extractive distillation is employed; the process is simple and has high separation efficiency; energy consumption in the separating process is substantially reduced, and therefore production cost is saved.

Description

technical field [0001] The invention relates to a chemical separation method, in particular to a method for integrating and separating nitroethane and 2-nitropropane through continuous side line rectification and extractive distillation. Background technique [0002] Low-carbon nitroalkanes are important solvents and intermediates. Nitromethane is mainly used as a solvent and gasoline additive; nitroethane is used in organic synthesis as a solvent for nitrocellulose and other resins, waxes, fats, dyes, etc. ; Nitropropane includes 1-nitropropane and 2-nitropropane, 2-nitropropane is used as a special solvent for ethylene and epoxy resin coatings, rocket fuel, gasoline additives, etc.; 1-nitropropane is mainly used as Solvents and intermediates, jet fuel, aerosols, etc. [0003] The production methods of nitromethane mainly include gas-phase nitration method and nitrite replacement method; nitroethane includes low-carbon alkanes, ethyl chloride and diethyl sulfate nitration ...

Claims

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Application Information

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IPC IPC(8): C07C205/02C07C201/16
Inventor 顾正桂
Owner 江苏沿江化工资源开发研究院有限公司
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