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Process for synthesizing methyl methacrylate from ethanol

A technology of methyl methacrylate and methyl propionate, which is applied in the field of synthesis of methyl methacrylate, can solve problems affecting economic and social stability, achieve the effects of increasing economic added value, broadening the downstream product chain of coal, and reducing the impact

Inactive Publication Date: 2021-05-28
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, my country has an energy structure with less oil and more coal, and needs to import a large amount of oil every year to satisfy the domestic market. These downstream products that use petrochemical products as raw materials have a large supply of raw materials when oil imports are impacted. Risks affecting domestic economic and social stability

Method used

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  • Process for synthesizing methyl methacrylate from ethanol
  • Process for synthesizing methyl methacrylate from ethanol

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Embodiment 1

[0031] The technical process of present embodiment ethanol synthetic methyl methacrylate is as figure 1 As shown, the specific process is as follows:

[0032] Raw material ethanol and CO enter the oxo synthesis reaction kettle a that catalyst (catalyst uses rhodium as active component, ethyl iodide as auxiliary agent, and lithium iodide as stabilizer) is housed through pipeline 1 and pipeline 2 respectively, and the reaction temperature is 150 ℃, pressure 2.5MPa. The propionic acid selectivity is greater than 90%, and the space-time yield is greater than 2.0mol / L / h. The still liquid containing propionic acid enters the flash tank b through pipeline 6, and the pressure drops to 0.15MPa. The partially vaporized liquid and CO enter the propionic acid separation tower c through the pipeline 4, and the unvaporized liquid, including propionic acid, unreacted ethanol, rhodium catalyst and other components, returns to the oxo reactor a through the pipeline 5 to continue to participa...

Embodiment 2

[0036] The reaction temperature in the oxo synthesis propionic acid operation in embodiment 1 becomes 200 ℃, and reaction pressure becomes 3.5MPa, and catalyzer becomes catalyzer (catalyst is active component with iridium, iodoethane is auxiliary agent, formylmorpholine is a stabilizer), the propionic acid selectivity is greater than 95%, and the space-time yield is greater than 2.8mol / L / h. The reactor in the esterification process is changed into a fixed-bed adiabatic reactor, the reaction temperature is 130° C., the reaction pressure is 0.3 MPa, and the catalyst is a sulfonic acid resin. The selectivity of methyl propionate is greater than 97%, and the conversion rate of methanol is greater than 98%. The temperature of the reactor in the aldol condensation reaction step is changed to 440° C., the pressure is changed to 0.3 MPa, the selectivity of methyl methacrylate is greater than 92%, and the conversion rate of formaldehyde is greater than 80%.

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Abstract

The invention provides a process for synthesizing methyl methacrylate from ethanol, and belongs to the technical field of methyl methacrylate synthesis. The process comprises the steps of taking ethanol and CO as raw materials, carrying out carbonylation reaction under the action of a catalyst to synthesize propionic acid, carrying out esterification reaction on propionic acid and methanol under the action of a strong acid catalyst to generate methyl propionate, and carrying out gas-phase aldol condensation reaction on methyl propionate and formaldehyde under the action of an acid-base catalyst to obtain a methyl methacrylate product. The existing MMA production technology such as an acetone cyanohydrin method (ACH), an isobutene method (C4 route) and an ethylene method belongs to production process technology of the petroleum route, the process provided by the inventiontakes ethanol as a raw material and is an MMA production technology of the coal-based route, and the development of the MMA production technology of the coal-based route has important practical significance for the current situation of less-oil and more-coal energy.

Description

technical field [0001] The invention belongs to the technical field of methyl methacrylate synthesis, in particular to a process for synthesizing methyl methacrylate with ethanol. Background technique [0002] Methyl methacrylate, abbreviated as MMA in English, is an important chemical raw material and chemical product. Methyl methacrylate produces polymethyl methacrylate through self-polymerization or copolymerization, and polymethyl methacrylate is commonly known as plexiglass. In addition, methyl methacrylate is also widely used as the second monomer in the production of polyvinyl chloride additive ARC and acrylic fibers, and can also be copolymerized with other vinyl monomers to obtain products with different properties. It can be used in coatings, lubricating oil additives, plastics, adhesives, resins, ion exchange resins, leather treatment agents, printing and dyeing auxiliaries, etc. [0003] At present, the global MMA production capacity is about 4.9 million tons. ...

Claims

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Application Information

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IPC IPC(8): C07C67/343C07C69/54C07C67/08C07C69/24C07C51/12C07C53/122
CPCC07C51/12C07C67/08C07C67/343C07C53/122C07C69/24C07C69/54
Inventor 李军毛震波王光永贾绘如赵国强陈晓华李荣王莉
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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