Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/02—Preparation of carboxylic acid esters by interreacting ester groups, i.e. transesterification
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/48—Separation; Purification; Stabilisation; Use of additives
  • C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
  • C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
  • B01D3/009—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in combination with chemical reactions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
  • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
  • B01D3/40—Extractive distillation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
  • B01J31/1616—Coordination complexes, e.g. organometallic complexes, immobilised on an inorganic support, e.g. ship-in-a-bottle type catalysts
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
  • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
  • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
  • C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
  • C07C29/84—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation by extractive distillation
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
  • C07C31/02—Monohydroxylic acyclic alcohols
  • C07C31/04—Methanol
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/03—Preparation of carboxylic acid esters by reacting an ester group with a hydroxy group
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
  • C07C69/52—Esters of acyclic unsaturated carboxylic acids having the esterified carboxyl group bound to an acyclic carbon atom
  • C07C69/533—Monocarboxylic acid esters having only one carbon-to-carbon double bond
  • C07C69/54—Acrylic acid esters; Methacrylic acid esters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
  • B01J2231/40—Substitution reactions at carbon centres, e.g. C-C or C-X, i.e. carbon-hetero atom, cross-coupling, C-H activation or ring-opening reactions
  • B01J2231/49—Esterification or transesterification
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
  • B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
  • B01J2531/46—Titanium

Definitions

• breaking an azeotrope of methanol and methyl (meth)acrylate refers to a method of producing a distillate product with a methanol concentration greater than the concentration of methanol in the minimum boiling azeotrope of methanol and methyl (meth)acrylate from a mixture with a methanol concentration less than or equal to the concentration of methanol in the minimum boiling azeotrope of methanol and methyl (meth)acrylate in a distillation column.
• Alkyl, aryl or alkenyl (meth)acrylates are commonly produced by transesterification of methyl (meth)acrylate with the respective alcohol.
• the alcohol of formula (I) may, for example, be added via the alcohol feed at a temperature between 0°C and 70°C.
• the addition of the alcohol of formula (I) via the distillation column may be performed batchwise or continuously.
• the azeotrope may be fed to the reactor prior to the alcohol and kept boiling under full reflux. Then, the alcohol desired for the reaction is fed into the column. While this alcohol is extracting the methyl (meth)acrylate of formula (III) out of the boiling azeotrope, it is also starting the transesterification reaction.
• Examples of a multistage distillation column with random packings are those such as Raschig rings, Raschig Super Rings, Lessing rings, Pall rings, Berl saddles, Intalox saddles; and examples of a multistage rectification column with structured packings are those such as the Mellapak type (Sulzer), MellapakPlus, the Rombopak type (Kiihni), the Montz-Pak type (Montz).
• Mellapak type Sulzer
• MellapakPlus the Rombopak type (Kiihni)
• Montz-Pak type Montz-Pak type
• the resulting alkyl (meth)acrylate in many cases already satisfies the general requirements of the respective alkyl (meth)acrylate product, such that further purification is in many cases not necessary.
• the product may also be isolated by distillation after the reaction has ended.
• the resulting mixture can be purified by known processes. Owing to the polymerization tendency of the monomer, it is advisable to employ distillation processes in which the thermal stress on the substance to be distilled is minimized.
• Very suitable apparatus is that in which the monomer is evaporated continuously from a thin layer, such as falling-film evaporators and evaporators with a rotating wiper system. Short-path evaporators can also be used.
• a distillation can be performed, in which a continuous evaporator with a rotating wiper system and attached column can be used. This distillation can be performed, for example, at a pressure in the range of 1 to 60 mbar and an evaporator temperature (surface temperature of wiped film evaporator) of 60°C to 130°C.
• a continuous transesterification reaction system consisting of a reactor fitted with an azeotrope column and an additional column for workup of a continuously withdrawn reactor crude product from which the un reacted raw materials are separated and recycled
• the reactor is continuously supplied with alcohol, MMA and catalyst (titanium (IV) alkoxide).
• the reactants were introduced to the reactor.
• 2-ethylhexanol was used as the alcohol.
• Methanol produced through reaction conversion is continuously withdrawn from the reactor in the form of a mixture containing methanol at a concentration lower than or equal to the azeotropic concentration of methanol via the azeotrope column.
• the density of the distillate is measured and recorded in real time and used to calculate the ratio of methanol and MMA (from the temperature corrected densities of the pure substances).
• concentration at the top of the column is typically 78 wt.% methanol.

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• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

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