The present disclosure relates to a method for preparing a crosslinker compound in which a crosslinker compound capable of using for the production of a super absorbent polymer can be obtained in a higher yield by a simple manner. The crosslinker compound obtained by the above method can be used as a thermally decomposable crosslinker in the process of producing a super absorbent polymer.

A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein pH at the reactor outlet is from 3 to 6.7.

A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein pH at the reactor outlet is from 3 to 6.7.

A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein mass transfer rate of oxygen in hour.sup.1 divided by space-time yield in moles methyl methacrylate/kg.Math.catalyst hour in the catalyst bed is at least 20.

A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein mass transfer rate of oxygen in hour.sup.1 divided by space-time yield in moles methyl methacrylate/kg.Math.catalyst hour in the catalyst bed is at least 20.

A process for preparing aldehydes from methanol includes introducing a feed stream comprising methanol and hydrogen gas into a reaction zone of a first reactor, converting the feed stream into an intermediate stream comprising C.sub.2 to C.sub.4 olefins in the reaction zone in the presence of a first catalyst, wherein the first catalyst is a microporous catalyst component, removing water and species C.sub.4 and heavier from the intermediate stream to form a lights stream, and converting the lights stream into a product stream comprising propionaldehyde in the presence of a second catalyst and carbon monoxide in a second reactor. The propionaldehyde can further be converted to methyl methacrylate via oxidative esterification.

A process for preparing aldehydes from methanol includes introducing a feed stream comprising methanol and hydrogen gas into a reaction zone of a first reactor, converting the feed stream into an intermediate stream comprising C.sub.2 to C.sub.4 olefins in the reaction zone in the presence of a first catalyst, wherein the first catalyst is a microporous catalyst component, removing water and species C.sub.4 and heavier from the intermediate stream to form a lights stream, and converting the lights stream into a product stream comprising propionaldehyde in the presence of a second catalyst and carbon monoxide in a second reactor. The propionaldehyde can further be converted to methyl methacrylate via oxidative esterification.

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting in a tubular reactor having at least four zones a mixture comprising methacrolein, methanol, oxygen and a base with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein reaction zones comprising catalyst beds alternate with mixing zones not comprising catalyst beds.

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting in a tubular reactor having at least four zones a mixture comprising methacrolein, methanol, oxygen and a base with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein reaction zones comprising catalyst beds alternate with mixing zones not comprising catalyst beds.

A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting in a tubular reactor having at least four zones a mixture comprising methacrolein, methanol, oxygen and a base with a catalyst bed of heterogeneous catalyst comprising a support and a noble metal, wherein reaction zones comprising catalyst beds alternate with mixing zones not comprising catalyst beds.