Process for recovering acrylic aldehyde or propionic aldehyde from low concentrate water solution flow

An acrolein, low-concentration technology, used in the separation/purification of carbonyl compounds, organic chemistry, etc., to achieve high total product recovery, low maintenance costs, and simple systems

Inactive Publication Date: 2006-07-12
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Purified product is surprisingly free of low-boiling impurities

Method used

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  • Process for recovering acrylic aldehyde or propionic aldehyde from low concentrate water solution flow
  • Process for recovering acrylic aldehyde or propionic aldehyde from low concentrate water solution flow
  • Process for recovering acrylic aldehyde or propionic aldehyde from low concentrate water solution flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0102] Examples 1-4: Laboratory scale distillation

[0103] Embodiment 1-4 uses figure 2The single-column distillation system shown is carried out, wherein, the stripping section: diameter 3gmm, 2 layers of Sulzer structure packing (equivalent to about 6 layers of theoretical trays), and 2 layers of sieve trays with downcomers below; Distillation section: 20 mm in diameter, 6 layers of Sulzer structure packing (equivalent to about 18 theoretical plates); light component removal section, 20 mm in diameter, 6 layers of Sulzer structure packing (equivalent to about 18 theoretical plates), in Above the side access port. The diameter of the water quenching cooling tower is 38mm.

[0104] The system is also equipped with auxiliary equipment for receiving fractions, sidedraw products and bottom discharges, sampling ports and post-processing equipment to avoid contact between operators and toxic substances.

[0105] The polymerization inhibitor solution used was hydroquinone (100 ...

Embodiment 5-7

[0109] Examples 5-7: Design of Simulation-Based Industrialization Process

[0110] In the following examples, a process model (computer model) of the acrolein purification process was established for use in the AspenPlus (version 10) process simulator. The model uses a non-random two-liquid (NRTL) liquid activity coefficient model to calculate the vapor-liquid equilibrium (VLE); NRTL parameters are compared to the mixture VLE data in the public literature and patent records for fitting. The model is used to calculate the design parameters and operating parameters of the distillation column for purifying and recovering acrolein.

[0111] The composition of the crude acrolein aqueous solution feed used in the following examples is shown in Table 2:

[0112] Feed composition

Embodiment 5

[0113] Embodiment 5: Utilize partial vacuum to improve the purity of acrolein product

[0114] Example 5a in Table 3 shows the simulation results for a side draw distillation column operated at atmospheric pressure; ie, the pressure in the condenser was 760 mmHg (absolute). In Example 5b in table 3, the same distillation column, fraction / feed ratio, reflux rate, acetaldehyde content in the acrolein side draw product, the difference is that the column operates under partial vacuum (condenser's The operating pressure is 490mmHg), and the temperature of each distillation section is correspondingly lower.

[0115] The simulation results show that the purification of acrolein can improve the purity and recovery rate when operating under vacuum compared with operating at or above atmospheric pressure.

[0116] Example 5a

[0117] other

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Abstract

A method of purifying acrolein or propionaldehyde with a single column distillation system is provided, where the distillation system has a side-draw take-off outlet for recovering purified acrolein or propionaldehyde located between the crude product feed point and the light-boiling impurities distillation site.

Description

[0001] related application [0002] This application claims priority based on provisional application 60 / 326,901 filed October 3,2001. field of invention [0003] The present invention relates to the recovery and purification of compounds, in particular to the purification of acrolein or propionaldehyde from a low concentration aqueous solution stream containing impurities. Background of the invention [0004] Acrolein and propionaldehyde are important industrial chemical raw materials, which can be used in various organic synthesis industries. For example, acrolein can react with methylmercaptan to form beta-methional (MTPA). [0005] The traditional method for the production of acrolein is the gas-phase oxidation of propylene over a solid-phase catalyst. The reaction produces a gas phase mixture containing: acrolein, gases such as nitrogen, oxygen, carbon monoxide and carbon dioxide, propylene,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/22C07C45/82C07C45/86
Inventor S・G・舍恩S・M・丹尼尔R・A・桑德
Owner ARKEMA FRANCE SA
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