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Process for recovering valued compounds from a stream derived from purification of methyl methacrylate

A technology of methyl methacrylate, methacrylic acid in the field of recovery and reuse of selected compounds capable of solving problems not specified etc.

Active Publication Date: 2011-04-27
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the document does not specify how much additional MMA is produced from the dehydration of α-MOB alone, and how much, if any, is produced from the esterification of MAA with methanol

Method used

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  • Process for recovering valued compounds from a stream derived from purification of methyl methacrylate

Examples

Experimental program
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Effect test

Embodiment 1

[0036] At room temperature and pressure, the distillation residue of methyl methacrylate (MMA) containing the following components was extracted with deionized water: 0.87 wt. % MMA, 2.4 wt. % methacrylic acid (MAA), 19.1 wt. methacrylamide (MAM), 48% by weight 5-methyl-2-methylene adipate (MMA dimer) and the balance unidentified waste residue material. 15.0 grams of deionized water and 15.0 grams of the distillation residue were added to a glass separatory funnel. Vigorously shake the material in the separating funnel by hand, then let it stand for more than 12 hours. The density of the organic phase is higher than that of the aqueous phase, and the organic phase is separated with the stopcock of the separatory funnel, and the aqueous phase is poured from the top of the separatory funnel. Immediately after partitioning, the phases were analyzed by gas chromatography equipped with a capillary column and flame ionization detector. The relative distribution of MMA, MAA, MAM an...

Embodiment 2

[0038] The MMA distillation residue with the same composition as in Example 1 was subjected to the same extraction and detection steps as in Example 1, except that 45.0 grams of deionized water was used as the extraction agent. The relative distribution of MMA, MAA, MAM and MMA dimers is listed in Table 1. The MAA and MAM recovered into the extract were 36.1 and 81.4%, respectively.

Embodiment 3

[0040] The MMA distillation residue with the same composition as in Example 1 was subjected to the same extraction and detection steps as in Example 1, except that 150.0 grams of deionized water was used as the extractant. The relative distribution of MMA, MAA, MAM and MMA dimers is listed in Table 1. The MAA and MAM recovered into the extract were 78.2 and 97.5%, respectively.

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Abstract

The present invention provides a method for extractive recovery and conversion of selected compounds, such as methacrylic acid (MAA) and 2-methacrylamide (MAM), from a stream derived from purification of methyl methacrylate (MMA) or methacrylic acid (MAA) produced via a conventional ACH route process.

Description

technical field [0001] The present invention relates to a process for the recovery and reuse of selected compounds, such as methacrylic acid and 2-methacrylamide, from streams resulting from the purification of methyl methacrylate. Background technique [0002] Methyl methacrylate is typically produced using a multi-step chemical reaction process, resulting in a crude product stream that contains not only the desired methyl methacrylate, but also other compounds, including but not limited to unreacted Raw materials, intermediate reaction products, by-products and impurities. Thus, one of the final steps in the multi-step process for producing methyl methacrylate involves purification, eg, by distillation, of the crude product stream to separate the desired methyl methacrylate product from most of the other compounds. It has been recognized that at least a portion of the other compounds may not be discarded as waste but used to produce additional methyl methacrylate or other...

Claims

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Application Information

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IPC IPC(8): C07C57/07C07C51/48C07C51/42C07C51/44C07C233/09C07C231/24C07C69/54C07C67/20C07C57/04C07C51/06C07C67/327
CPCC07C51/48C07C51/06C07C67/22C07C67/20C07C231/24C07C51/44C07C57/04C07C69/54C07C233/09
Inventor A·M·莱蒙德斯徐金锁
Owner ROHM & HAAS CO
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