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Process for recovering acrylonitrile or methacrylonitrile

A technology of methacrylonitrile and acrylonitrile, which is applied in the purification/separation of carboxylic acid nitrile, organic chemistry, hydrocarbon ammoxidation preparation, etc., can solve the problems of increasing operating costs and the like

Inactive Publication Date: 2006-04-05
이노빈유에스에이엘엘씨 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Periodic plant shutdowns are required to repair the incinerator and replace the refractory lining, which significantly increases operating expenses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027]Seven acidic column feed samples collected from the absorber were neutralized by adding sufficient basic additives to give a pH of 7. The additives and their amounts are summarized in Table 1 below.

[0028] A portion of each sample was allowed to stand at room temperature for 20 hours to determine the amount of pH shift. The results are summarized in Table 1.

[0029] Separate portions of each sample were treated with an equal amount of acetic acid. The pH changes for each sample are summarized in Table 1.

[0030] The rate of cyanoethylation of each additive relative to diethylamine was also determined. The results are summarized in Table 1.

[0031] Example

Additives

Relatively

Erquan

PH drift

move

Acetic acid pH

Variety

relative cyanonitrile

base speed

1

2

3

Comparative Example 1

Comparative Example 2

Comparative Example 3

Comparative Example 4

ammonium carbonate

h ...

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PUM

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Abstract

A process for the recovery of acrylonitrile or methacrylonitrile from an aqueous solution comprising subjecting the said solution to a water extractive distillation by feeding the solution to a distillation column and performing said extractive distillation and using solvent water introduced at the top of said column, removing a first overhead vapor stream of acrylonitrile or methacrylonitrile with some water from the top of the column, and a first liquid stream containing water and impurities from the bottom of the column, the contents of said column maintained at a substantially neutral pH by adding a sufficient amount of at least one alkaline compound selected from ammonium carbonate, ammonium bicarbonate, ammonium carbamate, and aikylene diamines to the overhead decanter and / or to the solvent water.

Description

Background of the invention [0001] The present invention relates to an improved process for the recovery of nitrile monomers from the effluent of an ammonolysis oxidation reactor of hydrocarbons. More specifically, the present invention relates to an improved process for the recovery of nitrile monomer contained in an ammonolysis oxidation effluent stream of propylene, propane, isobutane or isobutene in the production of acrylonitrile or methacrylonitrile. [0002] These methods, which are widely used in commercial practice to recover hydrocarbon ammonolysis oxidation products, generally include the following steps: a) contacting the effluent from the ammonolysis oxidation reactor in a quench tower with an aqueous quench liquid to cool the gaseous effluent; b) contacting the quenched effluent with water in the absorber to form an aqueous solution containing the ammonolysis oxidation products; c) subjecting the aqueous solution to extractive distillation with water in the recov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/26C07C253/34C07C255/08
CPCC07C253/34C07C253/26C07C255/08
Inventor 桑贾伊·P·戈德博尔马克·C·切萨
Owner 이노빈유에스에이엘엘씨