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Process for producing methacrylic acid or methacrylic acid esters

A technology of methacrylate and methacrylic acid, applied in the preparation of carboxylate, carboxylate, carbon-based compound, etc., can solve the problems of high energy cost, expensive equipment, high capital expenditure, etc.

Pending Publication Date: 2021-04-09
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separation of useful products from inert gas ballast thus entails high energy costs and consumes large amounts of cooling energy and water vapor for multi-stage distillation work-up steps
[0010] The preparation of MMA according to the methods described so far generates relatively large quantities of waste products, especially waste gases or wastewater, which require expensive disposal
[0011] Furthermore, carrying out some of the methods described above requires very complex and thus expensive equipment with attendant high capital expenditure and high maintenance costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Example 1: Synthesis of acrolein from glycerol as starting material (process step a)

[0087] The following example is a reproduction of Example 2 as disclosed in WO2012 / 72697.

[0088] Glycerol is converted to acrolein over a catalyst bed where hydrogen is used to lower the partial pressure of the reactants. The catalyst layer used consists of 56g catalyst, supported on ZrO 2 10 wt% WO on 3 composition, the ZrO 2 It is in the form of grains with a size of 20-30 mesh. The inlet liquid stream consisted of 20% by weight glycerol in water fed to the preheater at 0.3 g / min. A gas stream of 100 ml / min of hydrogen was also fed into the preheater. The liquid stream was preheated and vaporized to 280°C before entering the reactor. The inlet to the reactor was maintained at 300°C and a pressure of 5 bar gauge was exerted on the reactor. The outlet stream is cooled in a condenser and the water is condensed. The liquid stream was collected in a sample container while the g...

Embodiment 2

[0089] Example 2: Synthesis of acrolein from glycerol as starting material (process step a)

[0090] The following example is a reproduction of Example 1 as disclosed in US 2011 / 112330.

[0091] The cesium salt of tungstophosphoric acid (CsPW) was used for a 20% by weight aqueous solution of glycerol in a fixed catalyst bed, together with air. The fixed catalyst bed is heated at a temperature of 260°C to 350°C, and the feed gas has the following composition in mole percent: glycerol:oxygen:nitrogen:water=4.2:2.2:8.1:85.5. GHSV is 2445h -1 . Acrolein was obtained in a yield of 93.1%.

Embodiment 3

[0092] Example 3: Synthesis of acrolein from propylene as starting material (process step a)

[0093] The catalyst (Mo 1 PD 01.57e- 4 Bi 0.09 co 0.8 Fe 0.2 al 0.123 V 4.69e-3 K 5.33e-3 ). The reaction product showed a propylene conversion of 99% and acrolein selectivity of 98%.

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Abstract

The present invention relates to a process for producing methacrylic acid or methacrylic acid esters. The present invention is directed to a new process for the production of methacrylic acid or alkyl methacrylate starting from Acrolein, which is available from glycerol or propane.

Description

technical field [0001] The present invention relates to a process for the preparation of methacrylic acid or methacrylates. The present invention is directed to a new process for the preparation of methacrylic acid or alkyl methacrylates starting from acrolein obtainable from glycerol or propane. Background technique [0002] Methacrylic acid and methacrylates, such as methyl methacrylate (MMA), are used in a variety of applications. Furthermore, methyl methacrylate is an important building block for various specialty esters of methacrylic acid (MAA), which are prepared by transesterification with the corresponding alcohols. [0003] The commercial 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 by cooling and condensation into an aqueous methacrylic acid solution, optionally separated from low-boiling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/62C07C51/25C07C67/39C07C47/02C07C47/22C07C57/04C07C69/54C07C45/75B01J35/00
CPCC07C45/62C07C45/75C07C51/252C07C67/39C07C47/02C07C57/04C07C69/54C07C47/22B01J23/38B82Y30/00B82Y40/00C07C45/83B01J35/40
Inventor A·迈S·科里尔M·特雷斯科D·卡拉姆比亚G·阿维拉
Owner ROHM G M B H