Process for reclaiming methacrylic acid from a high-boiler phase and an aqueous phase

A technology of methacrylic acid and compound phase, applied in the field of high boiling point compound phase and water phase recovery of methacrylic acid, can solve the problems such as not teaching recovery of methacrylic acid

Inactive Publication Date: 2014-05-14
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of membrane filtration is that, in general, large volumes of water (often using the wastewater itself) are required to flush

Method used

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  • Process for reclaiming methacrylic acid from a high-boiler phase and an aqueous phase
  • Process for reclaiming methacrylic acid from a high-boiler phase and an aqueous phase
  • Process for reclaiming methacrylic acid from a high-boiler phase and an aqueous phase

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Embodiment

[0050] in accordance with figure 1 Examples 1-6 were carried out in the device. The high boiler and aqueous phases in different proportions were combined and passed through a paper filter. The filtrate was used as feedstock to a continuous mixer-settler unit. The feedstock was preheated in heat exchanger WT-100, mixed with different amounts of n-heptane (see table of results) as extraction medium and passed through static mixer R-310. In the mixer R-320 an intensive mixing of the high boilers / water phase and n-heptane is achieved, while in the settler B-330 the phases are separated. When equilibrium is reached, analytical samples are extracted at points Q1-Q3 and at the end of the run at Q4-Q6. Because this continuous experimental setup only achieved one separation step, each run was performed long enough (approximately 16 h) to collect enough material for the next extraction step. The mixer-settler unit was run in cross-flow mode only.

[0051]

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Abstract

The invention relates to a process for reclaiming methacrylic acid from a high- boiler phase in a heterogeneously catalysed gas phase oxidation of a C4- compound to methacrylic acid comprising the following steps a) Providing a high-boiler phase from a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid b) Providing an aqueous phase, preferably organically loaded, from a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid c) Mixing of components a) and b) optionally followed by filtration or centrifugation d) Adding an extraction media to the mixture from c) e) Subjecting the multiple-phase mixture from d) to at least one mixer-settler extraction process f) Recycling the organic phase from the last mixler-settler process back into the C4-process.

Description

technical field [0001] The present invention relates to a method for recovering methacrylic acid from a high boiler phase and an aqueous phase. Background technique [0002] Methacrylic acid (MAA) is used in a wide variety of applications. The industrial production of methacrylic acid takes place in particular by heterogeneously catalyzed gas-phase oxidation of isobutene, tert-butanol, methacrolein or isobutyraldehyde. The gaseous reaction phase thus obtained is converted into an aqueous solution of methacrylic acid by cooling and condensation, optionally separated from low-boiling substances such as acetaldehyde, acetone, acetic acid, acrolein and methacrolein, and then introduced into a solvent extraction column , to extract and separate methacrylic acid using a suitable extractant, such as a short-chain hydrocarbon. The separated methacrylic acid is further purified, for example by distillation, to separate high-boiling impurities such as benzoic acid, maleic acid and t...

Claims

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Application Information

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IPC IPC(8): C07C51/48C07C57/04
CPCC07C51/48C07C57/04
Inventor H·舍费尔T·巴尔杜夫P·彼得
Owner EVONIK ROEHM GMBH
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