A method for continuous synthesis of acylnaphthalene includes: mixing a raw solution containing 2-methylnaphthalene with an acylation liquid to obtain an acylation reaction liquid with a molar ratio of the 2-methylnaphthalene:the acylation agent:the Lewis catalyst of 1:1.3:1.5; adding the acylation reaction liquid into a microchannel reactor and a plurality of kettle reactors connected in series to perform acylation reaction, performing hydrolysis reaction on the acylation reaction liquid immediately after the acylation reaction liquid flows out of the plurality of kettle reactors to obtain a mixed solution, and subjecting the mixed solution to separation, rectification and crystallization, to obtain 2-methyl-6-propionylnaphthalene.

A method for continuous synthesis of acylnaphthalene includes: mixing a raw solution containing 2-methylnaphthalene with an acylation liquid to obtain an acylation reaction liquid with a molar ratio of the 2-methylnaphthalene:the acylation agent:the Lewis catalyst of 1:1.3:1.5; adding the acylation reaction liquid into a microchannel reactor and a plurality of kettle reactors connected in series to perform acylation reaction, performing hydrolysis reaction on the acylation reaction liquid immediately after the acylation reaction liquid flows out of the plurality of kettle reactors to obtain a mixed solution, and subjecting the mixed solution to separation, rectification and crystallization, to obtain 2-methyl-6-propionylnaphthalene.

The present invention relates to a process for the production of glycolaldehyde by thermolytic fragmentation of a carbohydrate feedstock comprising mono- and/or di-saccharide(s) and a system suitable for performing the process. The process and the system are suitable for industrial application, and the process may be performed in a continuous process.

The present invention relates to a process for the production of glycolaldehyde by thermolytic fragmentation of a carbohydrate feedstock comprising mono- and/or di-saccharide(s) and a system suitable for performing the process. The process and the system are suitable for industrial application, and the process may be performed in a continuous process.

A process for preparing aldehydes by a homogeneously catalysed hydroformylation of C.sub.4 to C.sub.20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream.

A process for preparing aldehydes by a homogeneously catalysed hydroformylation of C.sub.4 to C.sub.20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream.

A process for preparing aldehydes by a homogeneously catalyzed hydroformylation of C.sub.4 to C.sub.20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream in a three-stage removal.

A process for preparing aldehydes by a homogeneously catalyzed hydroformylation of C.sub.4 to C.sub.20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream in a three-stage removal.

The invention is concerned with a method for producing a conjugated diene including a reaction step of subjecting a raw material gas containing a monoolefin having a carbon atom number of 4 or more to an oxidative dehydrogenation reaction with a gas containing molecular oxygen in the presence of a catalyst, to obtain a reaction product gas containing a conjugated diene; and a cooling step of cooling the reaction product gas, wherein in the cooling step, a cooling agent is supplied into a cooling column and brought into contact with the reaction product gas; the cooling agent discharged from the cooling column is then cooled by a heat exchanger; a precipitate dissolved in the cooling agent is precipitated within the heat exchanger and recovered; and the cooling agent from which the precipitate has been recovered is circulated into the cooling column.

The invention is concerned with a method for producing a conjugated diene including a reaction step of subjecting a raw material gas containing a monoolefin having a carbon atom number of 4 or more to an oxidative dehydrogenation reaction with a gas containing molecular oxygen in the presence of a catalyst, to obtain a reaction product gas containing a conjugated diene; and a cooling step of cooling the reaction product gas, wherein in the cooling step, a cooling agent is supplied into a cooling column and brought into contact with the reaction product gas; the cooling agent discharged from the cooling column is then cooled by a heat exchanger; a precipitate dissolved in the cooling agent is precipitated within the heat exchanger and recovered; and the cooling agent from which the precipitate has been recovered is circulated into the cooling column.